Archana Dixit MD, MRCOG

• Consultant Obstetrician and Gynaecologist
• West Middlesex University Hospital NHS Trust
• Isleworth, Middlesex, UK

Anti-arrhythmics: possible increased risk of ventricular arrhythmias when telithromycin given with arthritis yoga dvd piroxicam 20 mg purchase with amex. Antibacterials: possible increased risk of ventricular arrhythmias when telithromycin given with arthritis medication lodine purchase piroxicam discount. Antidepressants: possible increased risk of ventricular arrhythmias when telithromycin given with arthritis diet to prevent piroxicam 20 mg amex. Antipsychotics: possible increased risk of ventricular arrhythmias when telithromycin given with arthritis australia gout diet cheap piroxicam 20 mg buy. Cytotoxics: telithromycin possibly increases plasma concentration of axitinib (reduce dose of axitinib- consult axitinib product literature); telithromycin possibly increases the plasma concentration of arthritis center piroxicam 20 mg purchase fast delivery. Pentamidine Isetionate: possible increased risk of ventricular arrhythmias when telithromycin given with parenteral. Antibacterials: plasma concentration of active metabolite of temsirolimus reduced by. Antivirals: manufacturer of tenofovir advises avoid concomitant use with adefovir; tenofovir reduces plasma concentration of atazanavir, also plasma concentration of tenofovir possibly increased; manufacturers advise avoid concomitant use of tenofovir with. Retinoids: possible increased risk of benign intracranial hypertension when tetracyclines given with. Allopurinol: plasma concentration of theophylline possibly increased by allopurinol Anaesthetics, General: increased risk of convulsions when theophylline given with ketamine Anti-arrhythmics: theophylline antagonises anti-arrhythmic effect of adenosine; plasma concentration of theophylline increased by propafenone Antibacterials: plasma concentration of theophylline possibly increased by clarithromycin and isoniazid; plasma concentration of theophylline increased by. Calcium-channel Blockers (continued) Appendix 1: Interactions Thyroid Hormones Antiepileptics (continued) 965 concentration of theophylline increased by. Analgesics: plasma concentration of tipranavir possibly reduced by buprenorphine Antacids: absorption of tipranavir reduced by antacids Antibacterials: tipranavir increases plasma concentration of. Antiepileptics: plasma concentration of topiramate often reduced by carbamazepine; topiramate reduces plasma concentration of perampanel; plasma concentration of topiramate possibly reduced by phenobarbital; topiramate increases plasma concentration of. Cytotoxics: possible increased risk of ventricular arrhythmias when toremifene given with. Cytotoxics: increased risk of haematological toxicity when trimethoprim (also with co-trimoxazole) given with. Antacids: manufacturer of high-dose ulipristal advises avoid concomitant use with. Antibacterials: manufacturer of ulipristal advises avoid concomitant use with clarithromycin and telithromycin; plasma concentration of ulipristal increased by erythromycin-manufacturer of ulipristal advises avoid concomitant use; manufacturer of ulipristal advises avoid concomitant use with. Ulcer-healing Drugs: manufacturer of high-dose ulipristal advises avoid concomitant use with. Azathioprine: increased risk of haematological toxicity when trimethoprim (also with co-trimoxazole) given with. Antibacterials: metabolism of valproate possibly inhibited by erythromycin (increased plasma concentration); avoidance of valproate advised by manufacturer of. Antiepileptics: plasma concentration of valproate reduced by carbamazepine, also plasma concentration of active metabolite of carbamazepine increased; valproate possibly increases plasma concentration of ethosuximide; valproate increases plasma concentration of. Anaesthetics, General: hypersensitivity-like reactions can occur when intravenous vancomycin given with general anaesthetics Antibacterials: increased risk of nephrotoxicity and ototoxicity when vancomycin given with. Analgesics: possible increased risk of ventricular arrhythmias when vandetanib given with. Anti-arrhythmics: possible increased risk of ventricular arrhythmias when vandetanib given with. Antibacterials: possible increased risk of ventricular arrhythmias when vandetanib given with parenteral. Antihistamines: possible increased risk of ventricular arrhythmias when vandetanib given with. Antimalarials: possible increased risk of ventricular arrhythmias when vandetanib given with. Antipsychotics: possible increased risk of ventricular arrhythmias when vandetanib given with. Beta-blockers: possible increased risk of ventricular arrhythmias when vandetanib given with. Cytotoxics: possible increased risk of ventricular arrhythmias when vandetanib given with. Hormone Antagonists: possible increased risk of ventricular arrhythmias when vandetanib given with. Pentamidine Isetionate: possible increased risk of ventricular arrhythmias when vandetanib given with. Antivirals: plasma concentration of vardenafil possibly increased by fosamprenavir; plasma concentration of vardenafil increased by. Dapoxetine: possible increased risk of serotonergic effects when venlafaxine given with. Antibacterials: manufacturer of vemurafenib advises avoid concomitant use with rifabutin and rifampicin Anticoagulants: vemurafenib possibly enhances anticoagulant effect of. Antibacterials: possible increased risk of neutropenia when vinorelbine given with. Doctors should satisfy themselves that the products can safely be prescribed, that patients are adequately monitored and that, where necessary, expert hospital supervision is available. The clinical condition for which the product has been approved is included with each entry. Note Foods included in this appendix may contain cariogenic sugars and patients should be advised to take appropriate oral hygiene measures. The presence of lactose (including residual lactose) in feeds is indicated in the relevant table, below. The primary sources of protein or amino acids are included with each product entry. The fat or oil content is derived from a variety of sources such as vegetables, soya bean, corn, palm nuts, and seeds; where the fat content is derived from animal or fish sources, this information is included in the relevant table, below. The suitability of food products for patients requiring a vegan, kosher, halal, or other compliant diet should be confirmed with individual manufacturers. Note Feeds containing more than 6 g/100 mL protein or 2 g/100 mL fibre should be avoided in children unless recommended by an appropriate specialist or dietician. Sugar content varies with flavour 975 Appendix 2: Borderline substances Appendix 2: Borderline substances 976 A2. Sugar content varies with flavour Appendix 2: Borderline substances Appendix 2: Borderline substances 978 A2. Use with caution in child 1­6 years Presentation & Flavour Sachets: 7 6 57 g = £5. Sugar content varies with flavour Fresubin Jucy Drink (Fresenius Kabi) ProvideXtra Juice Drink (Fresenius Kabi) Resource Dessert Energy ´ (Nestle) Resource Fruit ´ (Nestle) Liquid (sip feed) per 100 mL Liquid (sip feed) per 100 mL 630 kJ (150 kcal) 630 kJ (150 kcal) 4g whey protein 4g pea and soya protein hydrolysates 4. Nutritional values vary with flavour-consult product literature Appendix 2: Borderline substances Appendix 2: Borderline substances 982 A2. Nutritional values vary with flavour-consult product literature 983 Appendix 2: Borderline substances Appendix 2: Borderline substances 984 A2. Flavour not suitable for child under 3 years 985 Appendix 2: Borderline substances Appendix 2: Borderline substances 986 A2. Nutritional supplement in patients with lung cancer undergoing chemotherapy, or with pancreatic cancer Not suitable in child under 3 years Presentation & Flavour Powder: 400 g = £20. Not suitable for child under 1 year; use with caution in child 1­5 years Nutritional supplement for patients with pancreatic cancer Not suitable for child under 1 year; use with caution in child 1­4 years Carton: 240 mL = £3. Enteral feed or nutritional supplement in patients with chronic or acute renal failure who are not undergoing dialysis, or with chronic or acute liver disease with fluid restriction; other conditions requiring high energy, low protein, low electrolyte, low volume enteral feed Not suitable for child under 1 year; use with caution in child 1­5 years Nutritional supplement in patients with pancreatic cancer or with lung cancer undergoing chemotherapy Not suitable for child under 1 year; use with caution in child 1­4 years Bottle: 125 mL = £1. Fibre content varies with flavour Appendix 2: Borderline substances Appendix 2: Borderline substances 990 A2. Flavour not suitable for child under 3 years 991 Appendix 2: Borderline substances Appendix 2: Borderline substances 992 A2. Nutritional values vary with flavour-consult product literature Sachet: 87 g = £2. Not suitable for children under 1 year ´ Resource ThickenUp Clear (Nestle) Powder, maltodextrin, xanthum gum, gluten- and lactose-free, net price 125 g = £8. Flavours: black currant, lemon, orange; (hot drinks) chocolate, white coffee, white tea, net price 25 6 115 mL = £7. Nutritional supplement for patient hydration in the dietary management of dysphagia. Not suitable for children under 3 years Glucose (Dextrose monohydrate) Net price 500 g = £1. For dosage and administration details, consult product literature Thicken Aid (M & A Pharmachem) Powder, modified maize starch, maltodextrin, gluten- and lactose-free, net price 225 g = £3. Not suitable for children under 1 year except in cases of failure to thrive Carobel, Instant (Cow & Gate) Powder, carob seed flour. Not suitable for children under 1 year except in cases of failure to thrive Multi-thick (Abbott) Powder, modified maize starch, gluten- and lactosefree, net price 250 g = £4. Not suitable for children under 3 years Nutilis Powder (Nutricia Clinical) Powder, modified maize starch, gluten- and lactosefree, net price 20 6 12-g sachets = £6. Not suitable for children under 1 year except in cases of failure to thrive ´ Resource Thickened Drink (Nestle) Liquid, carbohydrate 22 g, energy: orange 382 kJ (90 kcal); apple 375 kJ (89 kcal)/100 mL. Not suitable for children under 1 year FlavourPac (Vitaflo) Powder, flavours: black currant, lemon, orange, tropical or raspberry, net price 30 6 4-g sachets = £12. Maxamum products are generally intended for use in children over 8 years and adults 2. Not suitable for children under 4 years Isoleucine50 (Vitaflo) Powder, isoleucine 50 mg, carbohydrate 3. Flavours: forest berries, orange, or tropical fruit, net price 250-mL carton = £9. Nutritional supplement for the dietary management of phenylketonuria in children over 1 year and adults ProZero (Vitaflo) Liquid, carbohydrate 8. Unflavoured (carbohydrate 11 g, energy 474 kJ (113 kcal)/29-g sachet), net price 30 6 29-g sachets = £120. Apple-black currant, citrus, or tropical flavour, net price 30 6 20-g sachet = £122. Unflavoured (white) or flavoured (orange, purple, or red), net price 30 6 87 mL = £117. Unflavoured (white) or flavoured (orange, purple, or red), net price 30 x 130 mL = £175. Unflavoured (white) or flavoured (orange, purple, or red), net price 30 6 174 mL = £236. For patients suffering from dry mouth as a result of having (or having undergone) radiotherapy, or sicca syndrome. Counselling needs to be related to the age, experience, background, and understanding of the individual patient. The pharmacist should ensure that the patient understands how to take or use the medicine and how to follow the correct dosage schedule. Any effects of the medicine on driving or work, any foods or medicines to be avoided, and what to do if a dose is missed should also be explained. Other matters, such as the possibility of staining of the clothes or skin by a medicine should also be mentioned. For some preparations there is a special need for counselling, such as an unusual method or time of administration or a potential interaction with a common food or domestic remedy, and this is indicated where necessary. Care should be taken not to obscure other relevant information with adhesive labelling. It is the usual practice for patients to take standard tablets with water or other liquid and for this reason no separate label has been recommended. Patients should be aware that a dispensed medicine should never be taken by, or shared with, anyone other than for whom the prescriber intended it. The label or labels for each preparation are recommended after careful consideration of the information available. However, it is recognised that in some cases this information may be either incomplete or open to a different interpretation. Appendix 3: Cautionary and advisory labels Original packs Most preparations are dispensed in unbroken original packs that include further advice for the patient in the form of patient information leaflets. More general leaflets advising on the administration of preparations such as eye drops, eye ointments, inhalers, and suppositories are also available. Scope of labels In general no label recommendations have been made for injections on the assumption that they will be administered by a healthcare professional or a well-instructed patient. The labelling is not exhaustive and pharmacists are recommended to use their professional discretion in labelling new preparations and those for which no labels are shown. Individual labelling advice is not given on the administration of the large variety of antacids. It is recognised that there may be occasions when pharmacists will use their knowledge and professional discretion and decide to omit one or more of the recommended labels for a particular patient. The exact wording that is required instead should then be specified on the prescription. Pharmacists label medicines with various wordings in addition to those directions specified on the prescription. All of the existing labels were user-tested, and the revised wording selected reflects terminology that is better understood by patients. Wordings which can be incorporated in an appropriate position in the directions for dosage or administration are labels 21­28. If separate labels are used it is recommended that the wordings be used without modification. If changes are made to suit computer requirements, care should be taken to retain the sense of the original. Doxycycline, lymecycline, and minocycline are less liable to form chelates and therefore only require label 6 (see above).

Blockade of muscarinic cholinoreceptors in the salivary glands reduces salivation arthritis in the left knee piroxicam 20 mg buy overnight delivery, causing dry mouth arthritis.org/eating well quality piroxicam 20 mg. List the adverse effects and contraindications for muscarinic cholinoreceptor antagonists can you get arthritis in the knee discount piroxicam 20 mg buy on-line. Asthma: An inflammatory lung condition characterized by reversible airway obstruction that can be precipitated by irritants such as environmental allergens arthritis treatments uk purchase piroxicam 20 mg with visa, cigarette smoke arthritis diet for animals purchase piroxicam line, cold air, or exercise. Muscarinic cholinoreceptor antagonists: Drugs that block the actions of acetylcholine. Structure Like atropine, the prototype muscarinic cholinoreceptor antagonist scopolamine is a tertiary amine. Administration the patch formulation of scopolamine for motion sickness provides for up to 72 hours of pharmacologic activity. Pharmacokinetics the duration of action of antimuscarinic agents ranges from less than a day (tropicamide) to 3­10 days (scopolamine, atropine). By blocking gastrointestinal motility, these agents can cause increased retention of infecting organisms. However, it has a very short duration of action and would be an unsuitable antidote. Scopolamine can cause drowsiness and sedation, as well as mydriasis, tachycardia, and urinary retention. Anticholinergic drugs versus non-drug active therapies for overactive bladder syndrome in adults. Transdermal scopolamine for prevention of motion sickness: clinical pharmacokinetics and therapeutic applications. During surgery the patient develops muscle rigidity and tachycardia, and his temperature rapidly rises. What drug should immediately be given to the patient, and what is its mechanism of action It works as an agonist of the nicotinic receptor at the motor endplate of the neuromuscular junction. It has a rapid onset and short duration of action because it is quickly hydrolyzed by plasma and liver cholinesterase. Malignant hyperthermia, a rare but significant cause of anesthetic morbidity and mortality, is an inherited autosomal dominant disorder that results in tachycardia, muscle rigidity, and high body temperatures in response to the use of certain inhaled anesthetics in combination with muscle relaxants, usually succinylcholine. It is caused by a release of calcium ions from the sarcoplasmic reticulum in muscle cells. Dantrolene interferes with this release and is therefore the treatment of choice for this condition. Contrast the mechanism of action of depolarizing and nondepolarizing neuromuscular junction-blocking agents. Succinylcholine is the prototype for depolarizing agents and used for brief paralysis for surgery and for intubation. Tubocurarine, the prototype, and other nondepolarizing agents (eg, cisatracurium, vecuronium, rocuronium) are used for longer term paralysis for surgery. In addition to malignant hyperthermia, succinylcholine administration may result in hyperkalemia, particularly in patients with burn and trauma, which could result in cardiac arrest. It is contraindicated in patients with neuromuscular disease, such as myasthenia gravis and muscular dystrophy, as well as in stroke. Certain nondepolarizing agents may produce hypotension, as a result of histamine release and some ganglionic blocking activity, and tachycardia as a result of vagolytic activity. The effects of nondepolarizing agents may be reversed by the acetylcholinesterase inhibitor, neostigmine. Numerous drug interactions between neuromuscular blocking agents and other drugs have been reported that lead to increased neuromuscular blockade, particularly with certain antibiotics and inhaled anesthetics. Continued exposure of endplates to succinylcholine results in their repolarization. In contrast to succinylcholine, which has a duration of action of about 6­10 min, the nondepolarizing agents have a longer duration of action (up to an hour). Administration the neuromuscular blocking agents are highly polar and therefore must be administered parenterally. Succinylcholine is eliminated by the hydrolytic action of plasma butyrylcholinesterase (pseudocholinesterase). After the surgery, he complains of diffuse muscle aches, which the anesthesiologist states is likely caused by the skeletal muscle relaxant. Myalgia (muscle aches) is a common adverse reaction of depolarizing agents such as succinylcholine; these agents also may induce hyperkalemia and malignant hyperthermia. Dantrolene interferes with the release of intracellular calcium and is therefore used to treat the muscle rigidity and hyperthermia associated with malignant hyperthermia. A small number of patients (1:10,000) with atypical cholinesterase experience long-lasting apnea of 1­4 hours following succinylcholine (or the nondepolarizing neuromuscular blocking drug mivacurium that is also eliminated by the action of butyrylcholinesterase). Mechanical ventilation is used to manage the apnea even though prescreening could detect this rare condition. Clinical presentation, treatment and complications of malignant hyperthermia from 1987 to 2006. She is hypotensive, with a blood pressure of 80/40 mm Hg, has an elevated heart rate (tachycardia) and decreased urine output (oliguria). Norepinephrine activates 1- and 1-adrenorecptors located in blood vessels and the heart, respectively, resulting in potent vasoconstriction. Although the action on 1-adrenoreceptors would be expected to increase heart rate, a reflex bradycardia is produced due to increased blood pressure; the net effect is little to no change in heart rate. Volume resuscitation is required in any patient with volume depletion prior to or concomitant with vasoconstriction to assure adequate perfusion of tissues. Vasopressive agents are most commonly used in patients where fluid resuscitation is inadequate to restore blood pressure. The 1-adrenoceptor-mediated effects in the heart result in an increase in cardiac output with minimal peripheral vasoconstriction. Specific dopamine receptors in the vasculature of the renal, coronary, and splanchnic systems allow for reduced arterial resistance and increased blood flow. At higher doses, there is a peripheral -adrenoceptor effect that overrides dopamine receptor-mediated vasodilation and results in vasoconstriction. The combination of renal blood-flow preservation, while supporting the blood pressure, is desirable in conditions of shock. Prolonged high doses of dopamine can result in peripheral tissue necrosis because of the -adrenoceptor-mediated vasoconstriction that reduces blood flow to the extremities, particularly in the digits. Receptor selectivity: Preferential binding (greater affinity) of a drug to a specific receptor group or receptor subtype at concentrations below which there is little, if any, interaction with another receptor group or subtype. Table 5­1 contrasts the effects of sympathetic adrenergic action with that of parasympathetic cholinergic activity in multiple organs. Some are nonselective (eg, ephedrine), whereas some have greater affinity for -adrenoceptors (eg, phenylephrine, metaraminol, methoxamine) or 1-adrenoceptor (eg, dobutamine) or 2-adrenoceptor (eg, terbutaline, albuterol) subgroups. However, selectivity is often lost as the dose of a sympathomimetic agent is increased. Compared to nonselective -receptor agonists (isoproterenol), a 1-selective sympathomimetic agents may increase cardiac output with minimal reflex tachycardia. The clinical utility of a particular sympathomimetic agent depends, among other factors, on the specific organ system and receptor subtypes that are involved. In the cardiovascular system, a reduction in blood flow by relatively selective -adrenoceptor sympathomimetic agents is used to achieve surgical hemostasis (epihephrine), reduced diffusion of local anesthetics (epinephrine), and a reduction of mucous membrane congestion in hay fever and for the common cold (ephedrine, phenylephrine). Sympathomimetic agents such as epinephrine are also used for emergency short-term treatment of complete heart block and cardiac arrest. Treatment of bronchial asthma represents a major use of a2-selective sympathomimetic agents (eg, terbutaline, albuterol). Its effect is bronchodilation and relaxation of the smooth muscles of the bronchioles. Ophthalmic examination is facilitated with the use of the directly acting -adrenoceptor sympathomimetic agonist, phenylephrine. Apraclonidine (and the indirectly acting sympathomimetic agent, cocaine) is used to confirm the diagnosis of Horner syndrome. In addition to -adrenoceptor-blocking agents, 2-selective agents (eg, apraclonidine, brimonidine) are used to lower intraocular pressure in glaucoma. The peripheral adverse effects of the sympathomimetic agents are generally an extension of their pharmacologic effects. These are most often cardiovascular in nature, particularly when they are administered parenterally, and may include increased blood pressure, arrhythmias, and cardiac failure. Structure Sympathomimetic agents, as well as norepinephrine and epinephrine, are derived from phenylethylamine. Substitutions on the amino group, the benzene ring or the - or -carbon, markedly alter the selectivity, activity, and metabolism of the sympathomimetic agents. For example, alkyl substitutions on the amino group tend to markedly increase -adrenoceptor selectivity. Indirectly acting sympathomimetic agents mimic the actions of norepinephrine by either displacing it or inhibiting its reuptake from adrenergic nerve endings. Administration Sympathomimetic agents are available for administration by topical, nasal, oral, ophthalmic, and parenteral routes depending on the drug and condition being treated. Decrease cardiac output Decrease systolic blood pressure Increase renal blood flow Produce significant peripheral vasoconstriction 5. Norepinephrine increases blood pressure by causing peripheral vasoconstriction by acting on 1-adrenoreceptors. Terbutaline and albuterol are preferred over ephedrine for relieving the bronchoconstriction of asthma, and other bronchial conditions, because of their greater bronchiolar selectivity. Use of long-acting beta-agonists and inhaled steroids in asthma: meta-analysis of observational studies. Molecular mechanisms of beta(2)-adrenergic receptor function, response, and regulation. Both the nonselective -adrenoreceptor antagonists and the 1-adrenoceptor selective antagonists are used to treat hypertension. Contrast the differences between the nonselective and relatively 1-selective adrenoceptor antagonists. Phentolamine, a nonselective, competitive -adrenoceptor antagonist, and phenoxybenzamine, a nonselective, noncompetitive -adrenoceptor antagonist, are used for the preoperative management of the marked catecholamine-induced vasoconstriction associated with pheochromocytoma. Prazosin and other 1-adrenoceptor selective antagonists (doxazosin, terazosin) are used to manage chronic mild-to-moderate hypertension and benign prostatic hypertrophy. In addition to the nonselective -adrenoceptor antagonists, there are two classes of clinically important selective -adrenoceptor antagonists, 1 and 2 (Table 6­1). Ischemic heart disease is managed with nonselective -adrenoceptor antagonists, propranolol, timolol, and nadolol, as well as 1-adrenoceptor selective antagonists, metoprolol, atenolol, bisoprolol, nebivolol, and esmolol. Cardiac arrhythmias are managed, depending on the arrhythmia, with propranolol and esmolol. Timolol and other -adrenoceptor antagonists are used to manage glaucoma by decreasing aqueous humor production and thereby reducing intraocular pressure. Labetalol (and several other agents, including carvedilol), in formulations used clinically, blocks both - and 1-adrenoceptors in a 3:1 ratio. Labetalol lowers blood pressure by decreasing systemic vascular resistance without any major effect on heart rate or cardiac output. It is used to treat hypertensive emergencies and hypertension from pheochromocytoma. The major adverse effects of nonselective -adrenoceptor antagonists are cardiac stimulation, primarily tachycardia because of baroreflex-mediated sympathetic discharge, and postural hypotension. Additional cardiac stimulation by phentolamine may be caused by antagonist activity at presynaptic 2-adrenoceptors that result in increased norepinephrine release. The major adverse effects of nonselective -adrenoceptor antagonists are related to their effects on smooth muscle, carbohydrate metabolism. In patients, with insulin-dependent diabetes, nonselective -adrenoceptor antagonists increase the incidence and severity of hypoglycemic episodes. The use of selective 1-adrenoceptor antagonists in patients with this condition offers some potential benefits. The latter effect is particularly prevalent with the nonselective -adrenoreceptor antagonists. Combined - and -adrenoreceptor antagonist (labetolol) or -adrenoreceptor antagonists with sympathomimetic activity (acebutolol or pindolol) have no effect on serum tricglycerides. Mechanism of Action -Adrenoceptor antagonists and -adrenoceptor antagonists interact directly, and either competitively or irreversibly with, respectively, -adrenoceptors and -adrenoceptors to block actions of the endogenous catecholamines (norepinephrine and epinephrine), and exogenously administered sympathomimetic agents. Antagonists of this receptor will therefore promote smooth muscle relaxation; in blood vessels, where these receptors are largely expressed, this leads to dilation. In the heart, activation of 1-receptors causes an increase in the force of contraction of cardiac muscle and an increase in heart rate. Administration - and -adrenoceptor antagonists are administered orally or parenterally. Esmolol is ultra-short-acting as a result of its ester linkage that is rapidly metabolized by plasma esterases. The effect on the cardiovascular system is a result of its action as an antagonist at which of the following Prazosin is an -adrenoceptor antagonist that will block epinephrinemediated contraction of the radial smooth muscle of the eye that results in mydriasis. All the other actions listed are mediated by -adrenoceptors, which would be blocked by -adrenoceptor antagonists like propranolol. It lowers blood pressure by decreasing systemic vascular resistance (-adrenoceptor antagonist activity), without any major effect on heart rate or cardiac output (-adrenoceptor antagonist activity).

Ester-type local anesthetics are metabolized rapidly by nonspecific plasma cholinesterases and generally have shorter half-lives than amidetype local anesthetics arthritis treatment kidney disease buy piroxicam 20 mg with mastercard. He asks the anesthesiologist about the type of "anesthetic gas" to be used rheumatoid arthritis diet research order piroxicam online pills, because he recalls that his mother developed severe liver problems from general anesthesia for a hysterectomy performed 2 years previously running with arthritis in feet buy genuine piroxicam on line. The patient asks whether nitrous oxide might be used arthritis in cats back purchase 20 mg piroxicam mastercard, because he has heard that it was a safe agent numbness in fingers due to arthritis buy generic piroxicam 20 mg online. This patient relates a story of how his mother developed severe liver problems as a result of a general anesthetic agent. Halothane-related mild type I hepatotoxicity is benign, self-limiting, and relatively common, affecting up to 25 percent of individuals, and is characterized by mild, transient increases in serum transaminase and by altered postoperative drug metabolism. The patient clinically has fever, jaundice, and a grossly elevated serum transaminase level that is probably immune mediated. Approximately 20 percent of halothane is oxidatively metabolized compared to only 2 percent of enflurane and 0. Describe the pharmacokinetic parameters of inhalation anesthetics that influence the onset of and recovery from anesthesia. List the advantages and disadvantages of the commonly used inhalation anesthetic agents. List the commonly used intravenously administered anesthetic agents and adjunct agents used in a "balanced anesthesia. Blood:gas partition coefficient: the solubility of an inhalation anesthetic in blood relative to air at 37°C (98. Second gas effect: the rate of rise of alveolar tension and inflow of an inhalation anesthetic gas can be increased in the presence of high concentrations of another anesthetic gas, usually nitrous oxide. The ideal anesthetic agent should be able to induce unconsciousness, analgesia, amnesia, skeletal muscle relaxation, and inhibition of autonomic and sensory reflexes. However, in practice, a combination of drugs ("balanced anesthesia"), including anesthetic agents that are administered intravenously, is used to provide a more satisfactory anesthesia than is possible with any one anesthetic agent alone, and to minimize their individual adverse effects (Table 22­1). Mole fraction equals partial pressure of anesthetic agent as percentage of total gas pressure (760 mm Hg). The blood:gas partition coefficient is a measure of the solubility of the gas in blood (Table 22­2). Anesthetic agents must become saturated in blood prior to uptake in the brain, the primary target for anesthetic action. Most halogenated inhaled anesthetic agents reduce peripheral vascular resistance with the possibility of reflex tachycardia. Halothane is a notable exception in that it has both vascular constrictor and relaxation activity and blocks reflex sympathetic stimulation of the heart. Malignant hyperthermia is a life-threatening, autosomal-dominant disorder that develops during or after general anesthesia with volatile anesthetics and muscle relaxants (eg, succinylcholine). Symptoms include a rapidly occurring hypermetabolic state of tachycardia, hypertension, severe muscle rigidity, hyperthermia, acidosis, and hyperkalemia. The biochemical basis of malignant hyperthermia is compromised regulation of calcium flux with increased intracellular concentrations of calcium in skeletal muscle. Treatment includes dantrolene, which prevents release of calcium from the sarcoplasmic reticulum, and supportive measures such as procedures to reduce body temperature and restore electrolyte balance. Structure With the exception of nitrous oxide, the major inhalation anesthetic agents in current use today are halogenated hydrocarbons. They are either gaseous (nitric oxide) with boiling points below room temperature or volatile liquids that at room temperature vaporize to the extent necessary to achieve anesthetic concentrations. Older theories based on the lipid solubility of these agents suggested that the effects were nonspecific interactions with lipids in cell membranes. The concentration (as a percentage) of an inhaled anesthetic in the inspired air directly affects the rate of induction of anesthesia by influencing the rate of transfer of the agent into blood. In clinical practice, an inhaled anesthetic may be administered initially at a relatively high concentration to speed the rate of induction, following which the concentration in the inspired air would be reduced to a level that maintains the anesthetic state. For anesthetic agents with low blood solubility, the partial pressure, and therefore the arterial tension, rises relatively quickly. The partial pressure and arterial tension rise more slowly with anesthetic agents of moderate to high solubility. The greater the difference in the arterial and venous anesthetic concentrations, the more time it will take for an inhaled anesthetic agent to equilibrate with brain tissue and to induce surgical anesthesia. The difference in the arterial and venous anesthetic concentrations is a reflection of the uptake of an anesthetic agent by the tissues, particularly muscle, kidney, liver, and splanchnic bed (which in turn is a reflection of, among other factors, blood flow, and tissue solubility relative to blood). Although counterintuitive, the higher the blood flow (and the higher the cardiac output), the slower the rate of rise of arterial tension, an effect that is most notable for inhaled anesthetics of moderate to high blood solubility. An increase in pulmonary ventilation rate (ie, minute ventilation), for example, by mechanical hyperventilation, increases anesthetic gas tension and the speed of induction, most notably for inhalation anesthetic agents with moderate to high blood solubility. The second gas effect can also be taken advantage of to increase the rate of rise of alveolar tension of an inhalation anesthetic gas. Typically this occurs when nitrous oxide is used in combination with a volatile anesthetic (halothane or isoflurane). Following termination of its administration, recovery from anesthesia depends on the rate of elimination of an anesthetic agent from the brain, which can be influenced by pulmonary blood flow and pulmonary ventilation, and by the tissue solubility and the blood solubility of the anesthetic agent. Clearance by the lungs is the major route of elimination of inhalation anesthetic agents, with perhaps metabolism playing a contributing role for halothane. After the completion of the case, the anesthesiologist turns off the gas and notes that the patient is recovering from the anesthetic agent very quickly. The alveolar partial pressure of an inhalation anesthetic with low blood and tissue solubility will rise quickly. Under these conditions, blood and brain will equilibrate, and anesthesia will be induced, rather quickly. An increase, not decrease, in pulmonary ventilation rate will increase anesthetic gas tension and the speed of induction, particularly for inhalation anesthetic agents with moderate to high blood solubility. Agents that have a rapid onset of action and rapid recovery have a low solubility. Dantrolene acts on intracellular calcium channels to prevent the release of calcium from intracellular stores, which has the effect of reducing cardiac muscle contraction. He has no significant medical history, takes no medications, does not smoke cigarettes, and has an alcoholic beverage "once in a while with the boys. What is the pharmacologic basis for using benzodiazepines to manage alcohol withdrawal This cross-reactivity explains why relatively long-acting benzodiazepines (eg, lorazepam, chlordiazepoxide) can be substituted for alcohol in a detoxification program. It is rapidly absorbed from the stomach and small intestine and distributed in total body water. At higher doses it is also oxidized by liver microsomal enzymes, which may be induced by chronic use. These enzymes are rapidly saturated by the concentrations of alcohol achieved by even one or two alcoholic drinks so that its rate of metabolism becomes independent of plasma concentration. Genetic variations in aldehyde dehydrogenase occur such that certain individuals display impaired ability to metabolize alcohol. The acetaldehyde metabolite accumulates in these individuals causing demonstrate a characteristic flushing of the skin upon drinking alcohol and increasing the likelihood of acute alcohol intoxication. A long-acting benzodiazepine can be taken, and gradually tapered, to mitigate this effect. It is a drug that inhibits aldehyde dehydrogenase that in the presence of alcohol causes an accumulation of acetaldehyde, which results in a highly aversive reaction consisting of flushing, severe headache, nausea and vomiting, and confusion. Psychologic dependence is the compulsive behavior of a user to continue to use a drug, no matter the personal or medical consequences. Physical or physiologic dependence is a consequence of drug abstinence after chronic drug use that results in a constellation of signs and symptoms that are often opposite to the initial effects of the drug and to those sought by the user. The development of physical dependence, the degree of which varies considerably for different drugs of abuse, is always associated with the development of tolerance, although the exact relationship is unclear. Drug addiction: A poorly defined, imprecise term with little clinical significance that indicates the presence of psychologic and physical dependence. Disulfiram inhibits aldehyde dehydrogenase to increase the accumulation of acetaldehyde. Exposure to alcohol in the presence of this drug causes flushing, headache, palpitations, nausea/vomiting, and decreased blood pressure. It may be most effective in those with a genetic predisposition to alcohol dependence. Acamprosate modulates glutamate neurotransmission by acting at central metabotropic glutamate receptors. Although this drug is generally well tolerated, its effectiveness remains equivocal. Nicotine replacement for smoking cessation is available in patch, gum, inhaler, lozenge, and nasal spray. Patch provides a continuous supply of nicotine, whereas the other routes of administration provide the opportunity for the patient to respond to cravings. Patch, gum, and lozenges are available over the counter, whereas the inhaler and nasal spray require a prescription. Although nicotine is a vasoconstrictor, its use in smoking cessation is safe even in patients with cardiovascular disease. By occupying the nicotinic cholinoreceptor, it prevents binding of nicotine to block the "reward" of smoking. Its effectiveness in smoking cessation is independent of its antidepressant effects. Withdrawal physical dependence syndrome characterized by increased appetite, depression, and exhaustion Nausea and vomiting of cancer. Cocaine-related arrhythmias, seizures, respiratory depression, hypertension, stroke, increased fetal mortality, and abnormalities Therapeutic uses Adverse effects Cancer, obstructive lung disease, cardiovascular disease Treatment of abuse Nicotine gum and transdermal patch Antipsychotic agents. Acetaldehyde is oxidized to acetate by mitochondrial hepatic aldehyde dehydrogenase. Disinhibited judgment, respiratory depression, and cutaneous vasodilation are acute effects of alcohol. Delirium Tremens, a syndrome associated with the abrupt discontinuation of alcohol in a chronic abuser, carries a high mortality rate if not promptly identified and treated. Withdrawal from other drugs of abuse may cause unpleasant symptoms for the patient, but is rarely life threatening. In all hypotheses of addiction, increased concentrations of dopamine in the mesolimbic system is considered the neurochemical correlate of dependence and addiction. Each year in the spring the child develops a runny nose; itchy, watery eyes; and sneezing. Degranulation occurs when immunoglobulin E (IgE) fixates to mast cells, and there is a subsequent exposure to a specific antigen. When released, histamine becomes bound to specific membrane-bound histamine receptors. The therapeutic uses of antihistamine medications primarily involve the H1-and H2-receptor subtypes. Their activation increases phospholipase C activity, causing increases in diacylglycerol and intracellular calcium. H1-receptor antagonists are frequently used for the treatment of allergic rhinitis, urticaria, and hives. Older, first-generation, antihistamines cross the blood-brain barrier, contributing to their potentially use-limiting side effect of sedation and can also have significant anticholinergic effects (dry mouth, dry eyes, blurred vision, urinary retention). They must be used with caution in the elderly and in combination with other sedating medications, because the effects can be additive. This results in a lower incidence of sedation and fewer anticholinergic side effects. Activation of H2 receptors in gastric parietal cells causes an increase in gastric acid production. Medications that are competitive antagonists of H2 receptors are used to reduce gastric acid secretion. These are used clinically in the management of peptic ulcer disease, gastroesophageal reflux disease, heartburn, and acid hypersecretory syndromes. Know the mechanism of action, uses, and adverse effects of antihistamine medications. Mast cells and basophils are the principal histamine-containing cells in most tissues. Histamine is stored in vesicles in a complex with heparin and is released by either an immunologic trigger or following a mechanical or chemical stimulus. Once released, histamine produces a number of responses including local vasodilation, transudation of fluid through endothelial cells, and stimulation of nerve endings, producing pain and itching. In the lung, histamine is a bronchoconstrictor, and this action is magnified in patients with asthma. The actions of histamine are mediated by four distinct membrane receptors that are coupled to G-proteins. The H1 receptor, located in smooth muscle cells, endothelium, and brain, is coupled to increased diacylglycerol and Ca2+ release. There is no clinical pharmacology yet for H3 (located in the brain and peripheral neurons) or H4 (found on eosinophils and neutrophils) receptors, but both of these receptors are targets for therapeutic agents and are under intense investigation. Histamine itself has a variety of untoward effects and is useful only diagnostically to assess bronchial hyperreactivity. Antihistamines Compounds that block the active state of histamine H1 receptors have been used for years and are widely marketed both as prescription and overthe-counter medications. The current group of available drugs can be divided into first-generation and second-generation agents.

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Histologic features of sinus histiocytosis with massive lymphadenopathy in patients with autoimmune lymphoproliferative syndrome cherry juice arthritis pain purchase piroxicam with american express. Nontuberculous mycobacterial cervicofacial lymphadenitis in children from the multicenter arthritis in back ribs discount piroxicam master card, randomized arthritis in the feet home remedies piroxicam 20 mg purchase without prescription, controlled trial in the Netherlands: relevance of polymorphisms in candidate host immunity genes effects of arthritis in dogs order generic piroxicam canada. Chronic high Epstein-Barr viral load state and risk for late-onset posttransplant lymphoproliferative disease/lymphoma in children arthritis medication limbrel order piroxicam 20 mg with amex. Anaplastic large cell lymphoma: another entity in the differential diagnosis of small round blue cell tumors. Pediatric marginal zone B-cell lymphomas; analysis of histopathology, immunophenotype and genetic aberrations. Balancing the risk versus diagnostic, prognostic, and therapeutic value of the procedure remains essential. Techniques and Risks of Endomyocardial Biopsy Since its first description in 1958,2 there have been continual improvements in the safety and efficacy of nonsurgical techniques for biopsy of cardiac tissue. The right internal jugular vein is the most common percutaneous access site, and, under fluoroscopic guidance, 5 to 10 samples (each 1 to 2 mm3) are obtained from the right ventricular septum. Immediate risks of biopsy include perforation with pericardial tamponade, ventricular or supraventricular arrhythmias, heart block, pneumothorax, puncture of central arteries, pulmonary embolization, nerve paresis, venous hematoma, damage to the tricuspid valve, and creation of arterial venous fistula within the heart. Delayed complications include access site bleeding, damage to the tricuspid valve, pericardial tamponade, and deep venous thrombosis. At the University of Chicago, five consecutive levels (each slide with six to eight sections) are cut, and hematoxylin and eosin (H&E) staining is performed on levels 1, 3, and 5. To prevent sample degradation and contamination, the use of pathogen-free biopsy devices and storage vials is required. It is difficult to accurately assess the incidence of acute myocarditis in children; however, a single large prospective study estimated an incidence of 17 per 100,000 person-years. Myocyte damage is evidenced by necrosis and myocyte debris, best seen on a longitudinal section. Degenerative changes, altered staining characteristics, vacuolization, frayed myocyte margins, and cellular disruption with infiltration of inflammatory cells may be present. The one exception to this overall good outlook is idiopathic giant cell myocarditis; however, this is extremely rare in children as discussed below. About 50% of cases of lymphocytic myocarditis are classified as idiopathic,6 many of which are presumed to be of viral origin. Drugs such as doxorubicin and anthracyclines, scorpion/snake bite related, heat stroke, and radiation exposure also result in lymphocytic myocarditis. Eosinophilic inflammation: Eosinophilic (Löffler) myocarditis is a rare form of myocardial inflammation associated with eosinophilia, which is most commonly idiopathic but can be seen in parasitic infection, hypereosinophilic syndromes, asthmatic bronchitis, Mycoplasma pneumonia, and malignancy. Extensive eosinophil degranulation may result in endocardial damage, seen as attached fibrin with entrapped eosinophils. The hallmark is asynchrony between the severity of the infiltrate and little, if any, myocyte necrosis, with ultimate resolution of the infiltrate and return to normal cardiac function upon withdrawal of the offending agent. Although predominantly an adult disease, it does occur in the pediatric age range, predominantly the second decade. Because approximately 20% of patients have an underlying autoimmune disorder, especially inflammatory bowel disease, an immune-mediated pathogenesis is presumed. Interstitial infiltrate is composed primarily of eosinophils associated with myocyte damage (seen in center left). Giant cells are often present and zone of inflammation may be extensive and confluent. A band-like infiltrate of primarily eosinophils with occasional lymphocytes is seen to traverse between (but not damage) the myocyte fibers. Lipofuscin pigment is prominent and there may be a mild chronic lymphocytic inflammation. There is myocyte hypertrophy, interstitial fibrosis, and thickened intramyocardial arterioles. It should be noted that small areas of disarray may occur in normal hearts, especially at the junction of the interventricular septum and right ventricle. Note presence of lipofuscin granules adjacent to several nuclei, which is unusual for this age. At 8 weeks of age, this is one of the youngest patients showing myocyte hypertrophy and focal disarray. Arrhythmogenic right ventricular dysplasia/cardiomyopathy is characterized by arrhythmia and right heart dilatation with focal replacement of myocardium by fat and fibrous tissue. There is loss of myocytes with intermingling of fat, fibrous tissue, and myocytes. Normal fat infiltration of the right ventricle is seen in obese patients and may be difficult to distinguish on biopsy. More often, it is seen in association with congenital cardiac malformations and other cardiomyopathies. Cardiac hemochromatosis may be due to autosomal recessive hemochromatosis, hemosiderosis due to chronic transfusion for anemia (thalassemia or sickle cell anemia), or rarely due to chronic ingestion of iron salts. Increased iron may also accumulate in patients with Wilson disease (copper toxicity). Ultrastructurally, there is evidence of myofibrillar loss with disorganized Z-band material and preservation of transverse tubules. Drug cardiotoxicity can occur with many cytotoxic drugs20 of which Adriamycin is the most common. Glycogen storage diseases are caused by a deficiency in one or more of the enzymes involved in the synthesis or degradation of glycogen, leading to the accumulation of glycogen in various tissues. Mucopolysaccharidoses are a family of hereditary diseases characterized by the accumulation of mucopolysaccharides due to deficiency in a lysosomal enzyme normally responsible for their degradation. These conditions lead to changes in cardiac valves, skin, cartilage, and bone, presumably due to the effect of acid mucopolysaccharides on collagen. Mucopolysaccharidosis I is characterized by reduced activity of -L-iduronidase; excessive urinary secretion of dermatan sulphate and heparan sulphate; and the presence of large, oval, or rounded connective tissue cells (Hurler cells) within the valves, endocardium, myocardium, coronary arteries, and aorta. These cells are filled with numerous clear vacuoles containing acid mucopolysaccharide material. Molecular genetic investigation can reveal the genetic defect, which is located on the short arm of chromosome 4 (4p16. Cardiovascular disease is part of the spectrum for the majority of patients with either the mild or the severe form of disease. Clear cells are also present in the myocardium and endocardium but not in coronary arteries. Molecular genetic investigation can reveal the genetic defect on the X chromosome (Xq27. Microscopically, intracellular deposits are localized in small granular cells, but large Hurler-like cells are not always described. Carnitine deficiency­associated cardiomyopathy is characterized by low plasma carnitine levels in a child with biventricular heart failure. Myocytes are enlarged and contain lipid vacuoles that can be confirmed with special stains for lipids. Sphingolipidosis: Fabry (Anderson-Fabry) disease is an X-linked inborn error of glycosphingolipid metabolism (3p21-23). The incidence is variable, depending on a variety of factors, but is estimated to be between 10% and 20%. Clinically, there is evidence of hemodynamic compromise (hypotension, shock, decreased cardiac output). Acute cellular rejection is characterized by an inflammatory infiltrate of lymphocytes, macrophages, and occasional eosinophils and can occur from days to years after transplantation. Clinically, it is usually asymptomatic and is estimated to occur at least once in up to 80% of cardiac allograft recipients. Smaller intramyocardial branches reveal diffuse concentric narrowing with luminal stenosis. Quilty lesion/effect was named after the first transplant patient it was observed in. It is an aggregate of lymphocytes found primarily in the endocardium of the ventricles which may extend into underlying myocardium. Diffuse mild rejection (G1B/G1R) Focal moderate rejection (G2/G1R) Multifocal moderate rejection (G3A/G2R) Severe rejection (G3B and G4/G3R) Few activated lymphocytes between myocytes No eosinophils or muscle damage Single focus of activated lymphocytes, which may include eosinophils, macrophages, and few plasma cells with focal myocyte damage Two or more foci of infiltrate with associated myocyte damage Rarely seen with current therapy Manifested by diffuse infiltrates (lymphocytes, eosinophils, and neutrophils) with myocyte necrosis and damage R denotes revised 2005 criteria. Quilty A lesions are composed of an endocardial infiltrate of mature small lymphocytes, often associated with small capillaries, with no involvement of the myocardium. Large endocardial infiltrate of mature lymphocytes extending in to the underlying myocardium. The infiltrate of cellular rejection (described previously) contains larger lymphocytes with scattered, occasional eosinophils and is associated with myocyte damage. Site of previous biopsy changes are very common in the early posttransplant period because the bioptome tends to go back to the same site, and biopsies are being performed frequently. Inflammation is present but usually insignificant and should not be confused with rejection. Clinically, patients may present with fever, with shortness of breath, with chest pain and/or tachycardia, and have elevated cardiac enzymes. Fungal infection is characterized by multifocal areas of myocyte necrosis and acute inflammation often with granuloma formation. Viral and parasitic infections may present with a nonspecific lymphocytic myocarditis. In the case of toxoplasmosis, cysts may be present in a normal-appearing myocardium. However, note the presence of fibrin, macrophages, and fibroblasts which differentiate it from rejection. Benign tumors include cardiac myxoma, rhabdomyoma, fibroma, hemangioma, lipoma, and lipomatous hypertrophy of interatrial septum. Malignant tumors, mainly sarcomas, are exceedingly rare in children (and adults) with an estimated incidence between 0. Sometimes, they appear as fine basophilic granules within myocytes and may resemble Toxoplasma organisms. Separation of myofibers is often seen secondary to rapid histologic processing and should not be interpreted as edema. With this finding, a careful search for epicardium is warranted to rule out perforation. This should be differentiated from just contraction bands, which would not have coagulative necrosis. Incidence of three presentations of acute myocarditis in young men in military service. The evolving approach to paediatric myocarditis: a review of the current literature. Detection of viral and bacterial protein in endomyocardial biopsies of patients with inflammatory heart muscle disease Arrhythmogenic right ventricular cardiomyopathy: an update on pathophysiology, genetics, diagnosis, and risk stratification. Primary endocardial fibroelastosis: an underappreciated cause of cardiomyopathy in children. Cardiomyopathy of Duchenne muscular dystrophy: current understanding and future directions. Mucopolysaccharidosis type I: current knowledge on its pathophysiological mechanisms. Evidence for an iduronate-sulfatase pseudogene near the functional Hunter syndrome gene in Xq27. The presentation and diagnosis of coronary allograft vasculopathy in pediatric heart transplant recipients. A specific diagnosis can be found in 50% of cases, with fungal infections being the most common. Although some interstitial lung diseases that occur in adults can be seen in children (particularly older adolescents), we emphasize those specific to or more common to pediatrics. Mass lesions include tumors (predominantly metastatic, primary tumors being extremely rare) and congenital lesions (such as pulmonary adenomatoid malformations and sequestrations). These are typically removed by wedge resection or lobectomy and are rarely biopsied. Degenerative changes in septate molds, especially in fungal balls, may lead to hyphal swelling and confusion with aseptate species. In immunosuppressed patients, Aspergillus is the most common opportunistic organism. In neutropenic patients, invasive pulmonary aspergillosis is characterized by an angioinvasive pattern with accompanying hemorrhagic infarction. A similar angioinvasive pattern is seen with other septate molds as well as zygomycosis. Less profoundly, immunosuppressed patients may have inflammation and necrosis with or without granulomas involving either the airways or lung parenchyma termed chronic necrotizing pulmonary or chronic necrotizing bronchial aspergillosis. The differential diagnosis for Aspergillus includes other rarer septate molds such as Fusarium and Pseudallescheria. Dematiaceous (brown pigment on H&E) molds are another rare cause of pulmonary infection with septate hyphae. Pulmonary zygomycosis occurs exclusively in immunosuppressed patients, particularly those with hematopoietic neoplasms. Examples of the genera include Rhizopus, Absidia, Mucor, and Rhizomucor and cannot be distinguished histologically.

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