Joao A C Lima, M.B.A., M.D.

https://www.hopkinsmedicine.org/profiles/results/directory/profile/0001032/joao-lima

Febrile Seizures Fever-associated seizures are common among children ages 6 months to 5 years blood pressure and exercise buy 0.25 mg lanoxin with amex. Febrile seizures typically manifest as generalized tonic-clonic convulsions of short duration pre hypertension natural cure buy lanoxin 0.25 mg overnight delivery. Children who experience these seizures are not at high risk of developing epilepsy later in life hypertension in 9th month of pregnancy buy lanoxin 0.25 mg without a prescription. Promotion of Potassium Efflux During an action potential prehypertension causes generic lanoxin 0.25 mg with amex, influx of sodium causes neurons to depolarize hypertensive urgency 0.25 mg lanoxin for sale, and then efflux of potassium causes neurons to repolarize. Mixed Seizures: Lennox-Gastaut Syndrome Lennox-Gastaut syndrome is a severe form of epilepsy that usually develops during the preschool years. The syndrome is characterized by developmental delay and a mixture of partial and generalized seizures. Seizure types include partial, atonic, tonic, generalized tonic-clonic, and atypical absence. In children with Lennox-Gastaut syndrome, seizures can be very difficult to manage. Neuronal action potentials are propagated by influx of sodium through sodium channels, which are gated pores in the cell membrane that control sodium entry. Immediately following sodium entry, the channel goes into an inactivated state, during which further sodium entry is prevented. Under normal circumstances, the inactive channel very quickly returns to the activated state, thereby permitting more sodium entry and propagation of another action potential. By delaying return to the active state, these drugs decrease the ability of neurons to fire at high frequency. Therefore, we must balance the desire for complete seizure control against the acceptability of side effects. Three options exist: neurosurgery, vagus nerve stimulation, and the ketogenic diet. Of the three, neurosurgery has the best success rate, but vagus nerve stimulation is used most widely. Phenytoin, for example, is useful for treating tonicclonic and partial seizures but not absence seizures. Conversely, Suppression of Calcium Influx In axon terminals, influx of calcium through voltage-gated calcium channels promotes transmitter release. Only one drug-valproic acid-appears effective against practically all forms of epilepsy. Making a diagnosis requires physical, neurologic, and laboratory evaluations along with a thorough history. The history should determine the age at which seizures began, the frequency and duration of seizure events, precipitating factors, and times when seizures occur. Physical and neurologic evaluations may reveal signs of head injury or other disorders that could underlie seizure activity, although in many patients the physical and neurologic evaluations may be normal. Other diagnostic tests that may be employed include computed tomography, positron emission tomography, and magnetic resonance imaging. Measurements of plasma drug levels are less important for determining effective dosages for absence seizures. Because absence seizures occur very frequently (up to several hundred a day), observation of the patient is the best means for establishing an effective dosage: if seizures stop, dosage is sufficient; if seizures continue, more drug is needed. In addition to serving as a guide for dosage adjustment, knowledge of plasma drug levels can serve as an aid to (1) monitoring patient adherence, (2) determining the cause of lost seizure control, and (3) identifying causes of toxicity, especially in patients taking more than one drug. Promoting Patient Adherence Epilepsy is a chronic condition that requires regular and continuous therapy. In fact, it is estimated that nonadherence accounts for about 50% of all treatment failures. Accordingly, promoting adherence should be a priority for all members of the healthcare team. Measures that can help include: · Educating patients and families about the chronic nature of epilepsy and the importance of adhering to the prescribed regimen. Until seizure control is certain, the patient should be warned not to participate in driving and other activities that could be hazardous should a seizure occur. No drug should be considered ineffective until it has been tested in sufficiently high dosages and for a reasonable time. Knowledge of plasma drug levels can be a valuable tool for establishing dosage and evaluating the effectiveness of a specific drug. The chart should be kept by the patient or a family member and should contain a complete record of all seizure events. This record will enable the prescriber to determine whether treatment has been effective. The nurse should teach the patient how to create and use a seizure frequency chart. Withdrawing Antiepileptic Drugs Some forms of epilepsy undergo spontaneous remission, and hence discontinuing treatment may eventually be appropriate. However, once the decision to discontinue treatment has been made, agreement does exist on how drug withdrawal should be accomplished. If the patient is taking two drugs to control seizures, they should be withdrawn sequentially, not simultaneously. Monitoring plasma drug levels is especially helpful when treating major convulsive disorders. Because these seizures can be dangerous and because delay of therapy may allow the condition to worsen, rapid control of seizures is desirable. However, because these seizures occur infrequently, a long time may be needed to establish control if clinical outcome is relied on as the only means of determining an effective dosage. Administer with or without food, but if administered with food, the food type and amount should be standardized to prevent fluctuations in drug levels. Administering first dose at bedtime is preferred because it may cause excessive sleepiness. Chewable tablets should be chewed or dissolved in small amounts of juice or water. Sprinkle capsules may be opened and sprinkled on soft food, but contents should not be crushed or chewed. These represent averages, which may be subtherapeutic for some patients while toxic for others. Monitoring the clinical response rather than plasma drug levels is the preferred method for dosage determination. Furthermore, with two other drugs-valproic acid and carbamazepine-their analysis showed some protection against suicidality. In addition, once treatment begins, all patients should be monitored for increased anxiety, agitation, mania, and hostility-signs that may indicate the emergence or worsening of depression, and an increased risk of suicidal thoughts or behavior. Patients, families, and caregivers should be alerted to these signs and advised to report them immediately. Four of these-carbamazepine, phenytoin, phenobarbital, and topiramate-are associated with harm to the human fetus. If it is necessary to prescribe any of these drugs, it is important to advise the patient of the risks and the need for additional contraceptives if pregnancy is not desired. Ezogabine, felbamate, gabapentin, lacosamide, lamotrigine, levetiracetam, oxcarbazepine, pregabalin, rufinamide, tiagabine, topiramate, vigabatrin, and zonisamide. Of importance, drugs in both groups appear equally effective-although few direct comparisons have been made. The drug is active against partial seizures as well as primary generalized tonic-clonic seizures. They are phenytoin, fosphenytoin, carbamazepine, valproic acid, ethosuximide, phenobarbital, and primidone. Mechanism of Action At the concentrations achieved clinically, phenytoin causes selective inhibition of sodium channels. Specifically, the drug slows recovery of sodium channels from the inactive state back to the active state. As a result, entry of sodium into neurons is inhibited, and hence action potentials are suppressed. As a result, the drug suppresses activity of seizure-generating neurons while leaving healthy neurons unaffected. Pharmacokinetics Phenytoin has unusual pharmacokinetics that must be accounted for in therapy. With the oral suspension and chewable tablets absorption is relatively fast, whereas with the extended-release capsules absorption is delayed and prolonged. In the past, there was concern that absorption also varied between preparations of phenytoin made by different manufacturers. As a result, switching from one brand of phenytoin to another produces no more variability than switching between different lots of phenytoin produced by the same manufacturer. Doses of phenytoin needed to produce therapeutic effects are only slightly smaller than the doses needed to saturate the hepatic enzymes that metabolize phenytoin. As you can see, once plasma levels have reached the therapeutic range, small changes in dosage produce large changes in plasma levels. As a result, small increases in dosage can cause toxicity, and small decreases can cause therapeutic failure. This relationship makes it difficult to establish and maintain a dosage that is both safe and effective. As indicated, this relationship is linear, in contrast to the nonlinear relationship that exists for phenytoin. Accordingly, for most drugs, if the patient is taking doses that produce plasma levels that are within the therapeutic range, small deviations from that dosage produce only small deviations in plasma drug levels. Because of this relationship, with most drugs it is relatively easy to maintain plasma levels that are safe and effective. However, at higher doses, the half-life becomes prolonged-in some cases up to 60 hours. Phenytoin can be used to treat all major forms of epilepsy except absence seizures. The drug is especially effective against tonic-clonic seizures, and is a drug of choice for treating these seizures in adults and older children. Other manifestations of excessive dosage include sedation, ataxia (staggering gait), diplopia (double vision), and cognitive impairment. Gingival hyperplasia (excessive growth of gum tissue) is characterized by swelling, tenderness, and bleeding of the gums. In extreme cases, patients require gingivectomy (surgical removal of excess gum tissue). A, Within the therapeutic range, small increments in phenytoin dosage produce sharp increases in plasma drug levels. This relationship makes it difficult to maintain plasma phenytoin levels within the therapeutic range. B, Within the therapeutic range, small increments in dosage of most drugs produce small increases in drug levels. With this relationship, moderate fluctuations in dosage are unlikely to result in either toxicity or therapeutic failure. This potential effect is yet another reason supporting administration into a large vein rather than the smaller veins in the lower arm or hand. Hirsutism (overgrowth of hair in unusual places) can be a disturbing response, especially in young women. Interference with vitamin D metabolism may cause rickets and osteomalacia (softening of the bones). Interference with vitamin K metabolism can lower prothrombin levels, thereby causing bleeding tendencies in newborns. For this reason, phenytoin should not be prescribed for patients known to have this mutation. It can cause cleft palate, heart malformations, and fetal hydantoin syndrome, characterized by growth deficiency, motor or mental deficiency, microcephaly, craniofacial distortion, positional deformities of the limbs, hypoplasia of the nails and fingers, and impaired neurodevelopment. Phenytoin should be used during pregnancy only if safer alternatives are not effective and if the benefits of seizure control are deemed to outweigh the risk to the fetus. Phenytoin can decrease synthesis of vitamin K­dependent clotting factors and can thereby cause bleeding tendencies in newborns. The risk of neonatal bleeding can be decreased by giving prophylactic vitamin K to the mother for 1 month before and during delivery, and to the infant immediately after delivery. As a result, phenytoin can decrease the effects of other drugs, including oral contraceptives, warfarin (an anticoagulant), and glucocorticoids (anti-inflammatory/immunosuppressive drugs). Because avoiding pregnancy is desirable while taking antiseizure medications and because phenytoin can decrease the effectiveness of oral contraceptives, the provider may need to increase the contraceptive dosage or switch to an alternative form of contraception. Because the therapeutic range of phenytoin is narrow, slight increases in phenytoin levels can cause toxicity. Consequently, caution must be exercised when phenytoin is used with drugs that can increase its level. These agents increase phenytoin levels by reducing the rate at which phenytoin is metabolized. Carbamazepine, phenobarbital, and alcohol (when used chronically) can accelerate the metabolism of phenytoin, thereby decreasing its level. Product labeling recommends flushing with saline both before and following intravenous administration. This risk can be decreased by initiating infusion in a large peripheral or central vein. In some cases, this has led to ischemia Preparations, Dosage, and Administration Preparations. Phenytoin products made by different manufacturers have equivalent bioavailability. Therefore, although switching between products from different manufacturers was a concern in the past, it is not a concern today.

Because they are unlikely to cause hypersensitivity reactions blood pressure medication effect on heart rate purchase lanoxin us, the amide-type anesthetics have largely replaced the ester-type agents when administration by injection is required arterial hypertension treatment buy lanoxin 0.25 mg overnight delivery. Use in Labor and Delivery Local anesthetics can depress uterine contractility and maternal effort blood pressure chart daily lanoxin 0.25 mg with mastercard. Methemoglobinemia Topical benzocaine can cause methemoglobinemia blood pressure machine name order lanoxin 0.25 mg on-line, a blood disorder in which hemoglobin is modified such that it cannot release oxygen to tissues hypertension updates discount lanoxin 0.25 mg online. Most cases were in children under 2 years of age treated with benzocaine gel for teething pain. However, with the development of newer agents, use of procaine has sharply declined. Preparations Procaine hydrochloride [Novocain] is available in solution for administration by injection. Epinephrine (at a final concentration of 1: 100,000 or 1: 200,000) may be combined with procaine to delay absorption. Lidocaine Lidocaine, introduced in 1948, is the prototype of the amide-type agents. Anesthesia with lidocaine is more rapid, more intense, and more prolonged than an equal dose of procaine. Allergic reactions are rare, and individuals allergic to ester-type anesthetics are not cross-allergic to lidocaine. In addition to its use in local anesthesia, lidocaine is employed to treat dysrhythmias (see Chapter 49). Control of dysrhythmias results from suppression of cardiac excitability secondary to blockade of cardiac sodium channels. Preparations Lidocaine hydrochloride [Xylocaine, others] is available in several formulations (cream, ointment, jelly, solution, aerosol, patch) for topical administration. Some injectable preparations contain epinephrine (1: 50,000, 1: 100,000, or 1: 200,000). In addition to causing local anesthesia, cocaine has pronounced effects on the sympathetic and central nervous systems. Administered topically, the drug is employed for anesthesia of the ear, nose, and throat. Unlike other local anesthetics, cocaine causes intense vasoconstriction (by blocking norepinephrine uptake at sympathetic nerve terminals on blood vessels). Accordingly, the drug should not be given in combination with epinephrine or any other vasoconstrictor. Despite its ability to constrict blood vessels, cocaine is readily absorbed following application to mucous membranes. The uses and hazards of these anesthesia techniques are discussed in the sections that follow. Topical Administration Surface anesthesia is accomplished by applying the anesthetic directly to the skin or a mucous membrane. Moderate doses cause euphoria, talkativeness, reduced fatigue, and increased sociability and alertness. Although cocaine does not seem to cause substantial physical dependence, psychologic dependence can be profound. These effects result from (1) central stimulation of the sympathetic nervous system and (2) blockade of norepinephrine uptake in the periphery. Stimulation of the heart can produce tachycardia and potentially fatal dysrhythmias. Cocaine presents an especially serious risk to individuals with cardiovascular disease. Preparations and Administration Cocaine hydrochloride is available as a topical solution (4% and 10%). Therapeutic Uses Local anesthetics are applied to the skin to relieve pain, itching, and soreness of various causes, including infection, thermal burns, sunburn, diaper rash, wounds, bruises, abrasions, plant poisoning, and insect bites. Application may also be made to mucous membranes of the nose, mouth, pharynx, larynx, trachea, bronchi, vagina, and urethra. In addition, local anesthetics may be used to relieve discomfort associated with hemorrhoids, anal fissures, and pruritus ani. Systemic Toxicity Topical anesthetics applied to the skin can be absorbed in amounts sufficient to produce serious or even life-threatening effects. Obviously, the risk of toxicity increases with the amount absorbed, which is determined primarily by (1) the amount applied, (2) skin condition, and (3) skin temperature. Accordingly, to minimize the amount absorbed, and thereby minimize risk, patients should: · · · · Apply the smallest amount needed. Avoid strenuous exercise, wrapping the site, and heating the site, all of which can accelerate absorption by increasing skin temperature. Administration by Injection Injection of local anesthetics carries significant risk and requires special skills. Because severe systemic reactions may occur, equipment for resuscitation should be immediately available. To ensure the needle is not in a blood vessel, it should be aspirated before injection. Following administration, the patient should be monitored for cardiovascular status, respiratory function, and state of consciousness. To reduce the risk of toxicity, local anesthetics should be administered in the lowest effective dose. Infiltration Anesthesia Infiltration anesthesia is achieved by injecting a local anesthetic directly into the immediate area of surgery or manipulation. The agents employed most frequently for infiltration anesthesia are lidocaine and bupivacaine. Other Local Anesthetics In addition to the drugs discussed previously, several other local anesthetics are available. These agents differ with respect to indications, route of administration, mode of elimination, duration of action, and toxicity. The local anesthetics can be grouped according to route of administration: topical versus injection. This technique has the advantage of producing anesthesia with doses that are smaller than those needed for infiltration anesthesia. As a result, when the technique is used during delivery, neonatal depression may result. Spinal anesthesia is produced by injecting local anesthetic into the subarachnoid space. Spread of anesthetic within the subarachnoid space determines the level of anesthesia achieved. Movement of anesthetic within the subarachnoid space is determined by two factors: (1) the density of the anesthetic solution and (2) the position of the patient. Blood pressure is reduced by venous dilation secondary to blockade of sympathetic nerves. If blood pressure cannot be restored through head-down positioning, drugs may be indicated; ephedrine and phenylephrine have been employed to promote vasoconstriction and enhance cardiac performance. Autonomic blockade may disrupt function of the intestinal and urinary tracts, causing fecal incontinence and either urinary incontinence or urinary retention. The prescriber should be notified if the patient fails to void within 8 hours of the end of surgery. These "spinal" headaches are posture dependent and can be relieved by having the patient assume a supine position. Intravenous Regional Anesthesia Intravenous regional anesthesia is employed to anesthetize the extremities- hands, feet, arms, and lower legs, but not the entire leg (because too much anesthetic would be needed). Before giving the anesthetic, blood is removed from the limb (by gravity or by application of an Esmarch bandage), and a tourniquet is applied to the limb (proximal to the site of anesthetic injection) to prevent anesthetic from entering the systemic circulation. To ensure complete blockade of arterial flow throughout the procedure, a double tourniquet is used. Following injection, the anesthetic diffuses out of the vasculature and becomes evenly distributed to all areas of the occluded limb. When the tourniquet is loosened at the end of surgery, about 15% to 30% of administered anesthetic is released into the systemic circulation. Lidocaine-without epinephrine-is the preferred agent for this type of anesthesia. Epidural Anesthesia Epidural anesthesia is achieved by injecting a local anesthetic into the epidural space. A catheter placed in the epidural space allows administration by bolus or by continuous infusion. Following administration, diffusion of anesthetic across the dura into the subarachnoid space blocks conduction in nerve roots and in the spinal cord itself. Diffusion through intervertebral foramina blocks nerves located in the paravertebral region. Small, nonmyelinated neurons are blocked more rapidly than large, myelinated neurons. There are two classes of local anesthetics: ester-type anesthetics and amide-type anesthetics. Onset of anesthesia occurs most rapidly with anesthetics that are small, lipid soluble, and nonionized at physiologic pH. Termination of local anesthesia is determined in large part by regional blood flow. Local anesthetics can be absorbed in amounts sufficient to cause systemic toxicity. The risk of systemic toxicity from topical anesthetics applied to the skin can be reduced by (1) using the smallest amount needed, (2) avoiding application to large areas, (3) avoiding application to broken or irritated skin, and (4) avoiding strenuous exercise and use of dressings or heating pads (which can increase absorption by increasing skin temperature). Implementation: Administration Routes Topical application to skin and mucous membranes. Administration Apply in the lowest effective dosage to the smallest area required. Ongoing Evaluation and Interventions Minimizing Adverse Effects Systemic Toxicity. To minimize absorption, apply topical anesthetics to the smallest surface area needed and, when possible, avoid application to injured skin. Warn parents to avoid the use of topical benzocaine in children younger than 2 years unless approved by a healthcare professional. For older children and adults, exercise Identifying High-Risk Patients Ester-type local anesthetics are contraindicated for patients with a history of serious allergic reactions to these drugs. Implementation: Administration Preparation of the Patient the nurse may be responsible for preparing the patient to receive an injectable local anesthetic. Preparation includes cleansing the injection site, shaving the site when indicated, and placing the patient in a position appropriate to receive the injection. Children, older adults, and uncooperative patients may require restraint before injection by some routes. Administration Injection of local anesthetics is performed by clinicians with special training in their use. Ongoing Evaluation and Interventions Minimizing Adverse Effects Systemic Reactions. Because anesthetics eliminate pain and because pain can be a warning sign of complications, patients recovering from anesthesia must be protected from inadvertent harm until the anesthetic wears off. Patients recovering from spinal anesthesia may experience headache and urinary retention. Headache is posture dependent and can be minimized by having the patient remain supine for about 12 hours. Before this, surgery was a brutal and exquisitely painful ordeal, undertaken only in the most desperate circumstances. Immobilization of the surgical field was accomplished with the aid of strong men and straps. General anesthesia produced a patient who slept through surgery and experienced no pain. These changes allowed surgeons to develop the lengthy and intricate procedures that are routine today. General anesthetics are also used to facilitate other procedures, including endoscopy, urologic procedures, radiation therapy, electroconvulsive therapy, transbronchial biopsy, and various cardiologic procedures. Our focus is on properties of an ideal anesthetic, pharmacokinetics of inhalation anesthetics, adverse effects of the inhalation anesthetics, and drugs employed as adjuncts to anesthesia. Properties of an Ideal Inhalation Anesthetic An ideal inhalation anesthetic would produce unconsciousness, analgesia, muscle relaxation, and amnesia. Furthermore, induction of anesthesia would be brief and pleasant, as would the process of emergence. As you might guess, the ideal inhalation anesthetic does not exist: No single agent has all of these qualities. General anesthetics are drugs that produce unconsciousness and a lack of responsiveness to all painful stimuli. In contrast, local anesthetics do not reduce consciousness, and they blunt sensation only in a limited area (see Chapter 26). General anesthetics can be divided into two groups: (1) inhalation anesthetics and (2) intravenous anesthetics. When considering the anesthetics, we need to distinguish between the terms analgesia and anesthesia. In contrast, anesthesia refers not only to loss of pain but to loss of all other sensations. Put another way, balanced anesthesia is a technique employed to compensate for the lack of an ideal anesthetic.

Nonetheless hypertension 130100 lanoxin 0.25 mg buy amex, if the patient asks for the information prehypertension 38 weeks order cheap lanoxin online, the pharmacist must provide it heart attack is recognized by a severe pain lanoxin 0.25 mg order fast delivery, regardless of the request to withhold it blood pressure medication and foot pain cheap lanoxin online master card. The purpose of the warning is to alert prescribers to (1) potentially severe side effects blood pressure levels exercise generic lanoxin 0.25 mg free shipping. The boxed warning should provide a concise summary of the adverse effects of concern, not a detailed explanation. A boxed warning must appear prominently on the package insert, on the product label, and even in magazine advertising. Researchers at Johns Hopkins estimated the 2016 death rate due to medication errors to be over 400,000 patients annually. They further noted that, if medication errors were listed on death certificates, these errors would comprise the third leading cause of death in the United States. The financial costs are staggering: Among hospitalized patients alone, treatment of drug-related injuries costs about $3. For example, giving an excessive dose can cause direct harm from dangerous toxic effects. Conversely, giving too little medication can lead to indirect harm through failure to adequately treat an illness. Among fatal medication errors involving drug administration, the most common types are giving an overdose (36. When patients are admitted to the hospital, poor communication regarding medications they were taking at home can result in the wrong drug or wrong dosage being prescribed. To reduce name-related medication errors, some hospitals are required to have a "read-back" system, in which verbal orders given to pharmacists or medical staff are transcribed and then read back to the prescriber. Such events may be related to professional practice, healthcare products, procedures, and systems, including prescribing; order communication; product labeling, packaging and nomenclature; compounding; dispensing; distribution; administration; education; monitoring; and use. In the hospital setting, a medication order must be processed by several people before it reaches the patient. The process typically begins when a healthcare provider enters the order into a computer. Because the nurse is the last person who can catch mistakes made by others, and because no one is there to catch mistakes the nurse might make, the nurse bears a heavy responsibility for ensuring patient safety. Ways to Reduce Medication Errors Organizations throughout the country are working to design and implement measures to reduce medication errors. Inaccurate placement of a decimal during drug calculation resulted in a drug overdose or underdose. Failure to adequately dilute an intravenous medication resulted in severe phlebitis. Incorrect programming into the database resulted in improper drug labeling that caused a medication error. Stocking otic drops instead of ophthalmic drops contributed to administration of the wrong drug formulation, which resulted in eye damage. Substituting a "3" for an "8" when transcribing the original drug order to a computer resulted in the patient being prescribed a subtherapeutic drug dosage. Inadequate time devoted to task due to higher-than-typical patient acuity contributed to failure to administer a scheduled drug. Decreased concentration on task resulted in inadequate safety checks that contributed to giving a drug overdose. Illegible handwriting contributed to misinterpretation of a drug order, so the patient received the wrong drug. A verbal order for cefuroxime, a second-generation cephalosporin, was transcribed as cefotaxime, a third-generation cephalosporin. Celebrex, an analgesic to manage pain, was confused with Celexa, a drug used to manage depression. Confusion because the tablet or capsule is similar in color, shape, or size to tablets or capsules that contain a different drug or a different strength of the same drug. Carton looks similar to other cartons from the same manufacturer or cartons from a different manufacturer. Label looks similar to other labels from the same manufacturer or to labels from a different manufacturer. Wrong patient name; wrong drug name; wrong strength; wrong or incomplete directions. Some specific measures that have been widely implemented to reduce errors have had remarkable success, such as the following: · Replacing handwritten medication orders with a computerized order entry system has reduced medication errors by 50%. Many medication errors result from using error-prone abbreviations, symbols, and dose designations. The objective is not to establish blame, but to improve patient safety by increasing our knowledge of medication errors. By consulting the list, the new provider will be less likely to omit a prescribed medication or commit a dosing error, and less likely to prescribe a new medication that might duplicate or negate the effects of a current medication, or interact with a current medication to cause a serious adverse event. Every time a new transition in care occurs, reconciliation should be conducted again. Medication reconciliation is an important intervention to reduce medication errors. Roughly 60% of medication errors occur when patients undergo a transition in care. When patients leave a facility, they should receive a single clear, comprehensive list of all medications they will be taking after discharge. The list should include any medications ordered at the time of discharge, as well as any other medications the patient will be taking, including over-the-counter drugs, vitamins, and herbal products and other nutritional supplements. In addition, the list should include all prescription medications that the patient had been taking at home but that were temporarily discontinued during the episode of care. The discharge list should not include drugs that were used during the episode of care but are no longer needed. The purpose is to reduce medication omissions, duplications, and dosing errors as well as adverse drug events and interactions. Medication reconciliation is the process of comparing a list of all medications that a patient is currently taking with a list of new medications that are about to be provided. Reconciliation is conducted whenever a patient undergoes a transition in care in which new medications may be ordered, or existing orders may be changed. Transitions in care include hospital admission, hospital discharge, moving to a different level of care within a hospital, transfer to another facility, or discharge home. For each drug, include the name, indication, route, dosage size, and dosing interval. For patients entering a hospital, the list would consist of all medications being taken at home, including vitamins, herbal products, and prescription and nonprescription drugs. For example, the prescriber would discontinue drugs that are duplicates or inappropriate, and would avoid drugs that can interact adversely. Patients at increased risk of adverse drug events include the very young, older adults, the very ill, and those taking multiple drugs. An iatrogenic disease is a disease that occurs as the result of medical care or treatment. An idiosyncratic effect is an adverse drug reaction based on a genetic predisposition. The intensity of an allergic drug reaction is based on the degree of immune system sensitization-not on drug dosage. Drugs are the most common cause of acute liver failure, and hepatotoxicity is the most common reason for removing drugs from the market. At the time a new drug is released, it may well be able to cause adverse effects that are as yet unreported. Measures to minimize adverse drug events include avoiding drugs that are likely to harm a particular patient, monitoring the patient for signs and symptoms of likely adverse effects, educating the patient about possible adverse effects, and monitoring organs that are vulnerable to a particular drug. Medication errors can be made by many people, including pharmaceutical workers, pharmacists, prescribers, transcriptionists, nurses, and patients and their families. Each is in a position to introduce errors, and each is in a position to catch errors made by others. Because the nurse is the last person who can catch mistakes made by others, and because no one is there to catch mistakes the nurse might make, the nurse bears a unique responsibility for ensuring patient safety. The three most common types of fatal medication errors are (1) giving an overdose, (2) giving the wrong drug, and (3) using the wrong route. At the heart of efforts to reduce medication errors is a change in institutional culture-from a punitive system focused on "naming, blaming, and shaming" to a nonpunitive system in which medication errors can be discussed openly, thereby facilitating the identification of errors and the development of new safety procedures. The potential consequences are that we will produce toxicity in the smaller person and undertreat the larger person. To compensate for this potential source of individual variation, providers consider the size of the patient when determining the dosage to prescribe. When adjusting dosage to account for body weight, the prescriber may base the adjustment on body surface area rather than on weight per se. Because percentage of body fat can change drug distribution and because altered distribution can change the concentration of a drug at its sites of action, dosage adjustments based on body surface area provide a more precise means of controlling drug responses than do adjustments based on weight alone. In the very young patient, heightened drug sensitivity is the result of organ immaturity. In older adults, heightened sensitivity results largely from decline in organ function. Other factors that affect sensitivity in older adults are increased severity of illness, the presence of multiple comorbidities, and treatment with multiple drugs. The clinical challenge created by heightened drug sensitivity in very young or older-adult patients is the subject of Chapters 10 and 11, respectively. Individual variation in drug responses has been a recurrent theme throughout earlier chapters. We noted that, because of individual variation, we must tailor drug therapy to each patient. In this article, we discuss the major factors that can cause one patient to respond to drugs differently from another. With this information, you will be better prepared to reduce individual variation in drug responses, thereby maximizing the benefits of treatment and reducing the potential for harm. Four pathologic conditions, in particular, may have a profound effect on drug response: (1) kidney disease, (2) liver disease, (3) acid-base imbalance, and (4) altered electrolyte status. Kidney Disease Kidney disease can reduce drug excretion, causing drugs to accumulate in the body. Accordingly, if a patient is taking a drug that is eliminated by the kidneys, and if renal function declines, dosage must be decreased. Recall that the intensity of the response to a drug is determined in large part by the concentration of the drug at its sites of action-the higher the concentration, the more intense the response. Kanamycin was administered at time "0" to two patients, one with healthy kidneys and one with renal failure. Note that drug levels declined very rapidly in the patient with healthy kidneys and extremely slowly in the patient with renal failure, indicating that renal failure greatly reduced the capacity to remove this drug from the body. Excitable tissues (nerves and muscles) are especially sensitive to alterations in electrolyte status. Given that disturbances in electrolyte balance can have widespread effects on cell physiology, we might expect that electrolyte imbalances would cause profound and widespread effects on responses to drugs. However, this does not seem to be the case; examples in which electrolyte changes have a significant impact on drug responses are rare. Digoxin, a drug for heart disease, provides an important example of an altered drug effect occurring in response to electrolyte imbalance. The most serious toxicity of digoxin is production of potentially fatal dysrhythmias. The tendency of digoxin to disturb cardiac rhythm is related to levels of potassium: When potassium levels are low, the ability of digoxin to induce dysrhythmias is greatly increased. Accordingly, all patients receiving digoxin must undergo regular measurement of serum potassium to ensure that levels remain within a safe range. Digoxin toxicity and its relationship to potassium levels are discussed in Chapter 48. Patients who are tolerant to a drug require higher doses to produce effects equivalent to those that could be achieved with lower doses before tolerance developed. There are three categories of drug tolerance: (1) pharmacodynamic tolerance, (2) metabolic tolerance, and (3) tachyphylaxis. As indicated, kanamycin levels fall off rapidly in the patient with good kidney function. Because of kidney disease, the half-life of kanamycin has increased by nearly 17-fold-from 1. Under these conditions, if dosage is not reduced, kanamycin will quickly accumulate to dangerous levels. Pharmacodynamic Tolerance the term pharmacodynamic tolerance refers to the familiar type of tolerance associated with long-term administration of drugs such as morphine and heroin. Pharmacodynamic tolerance is the result of adaptive processes that occur in response to chronic receptor occupation. Therefore, if liver function declines, the rate of metabolism will decline, causing drug levels to climb. Accordingly, to prevent accumulation to toxic levels, dosage of drugs eliminated via hepatic metabolism must be reduced or discontinued if liver disease develops. Metabolic Tolerance Metabolic tolerance is defined as tolerance resulting from accelerated drug metabolism. Because of increased metabolism, dosage must be increased to maintain therapeutic drug levels. Acid-Base Imbalance By altering pH partitioning (see Chapter 4), changes in acid-base status can alter the absorption, distribution, metabolism, and excretion of drugs. Recall that, because of pH partitioning, if there is a difference in pH on two sides of a membrane, a drug will accumulate on the side where the pH most favors its ionization.

Syndromes

• Pain medication, if necessary. Various other medications can reduce the stabbing pains that some people experience. The benefits of medications should be weighed against any possible side effects.
• Flank pain
• Activity level
• Bone spurs
• High blood pressure in some people
• Fungal arthritis
• Infection (a slight risk any time the skin is broken)
• Chemotherapy
• Less interest in daily activities

After the initial assessment blood pressure joint pain lanoxin 0.25 mg purchase fast delivery, six studies continued to follow the study subjects through 24 to 52 weeks of patch treatment hypertension 15090 purchase generic lanoxin. A review of these and additional studies heart attack hotone order genuine lanoxin on-line, reveals some general conclusions regarding the effectiveness of nicotine patches in tobacco cessation arteria pulmonar discount lanoxin american express. In every study blood pressure of 130/80 0.25 mg lanoxin order free shipping, many smokers abstained after treatment with placebo patches; nicotine treatment was initially more effective than placebo; and improved abstinence rates were more marked in the short term (10 weeks) than in the long term (52 weeks). Subjects undergoing tobacco cessation trials tended to gain weight irrespective of whether placebo or nicotine patches were worn. Patients often favor the nicotine polacrilex gum (Nicorette) which releases nicotine into the blood stream via the oral mucosa. Data are now available from tobacco cessation studies carried out in general medical practices. The effectiveness of nicotine patch substitution under these conditions is like the results described previous. Most patch systems and gum are now available as over-the-counter products; only Habitrol remains prescription. This drug is a norepinephrine/serotonin/dopamine reuptake inhibitor and its action directly affects the craving for tobacco. This product targets certain nicotine receptors to prevent nicotine access and diminishes the mesolimbic dopamine reward associated with nicotine use. The reader is referred to more comprehensive information about these products and the treatment of tobacco cessation. Battery operated E-cigarettes are gaining in popularity, allowing the user to inhale vapors containing nicotine without the tar and carbon monoxide found in cigarettes. A new study indicates that subjects, with no immediate intention of quitting who switched to e-cigarettes demonstrated quitting behavior. Therefore, in patients who smoke but do not intend to quit, the use of e-cigarettes, with or without nicotine (but more successfully with nicotine), decreased cigarette consumption with lasting results, reducing the harmful side effects of smoking (Caponnetto 2013). The most recent statistics from the 2018 Monitoring the Future Study indicate that 8th, 10th, and 12th graders prefer and more heavily abuse e-cigarettes compared to traditional tobacco products. These e-cigarettes cause a heated source to vaporize the nicotine-containing material giving the perception that they are safer than tobacco products. The reader should be reminded that these e-cigarettes can be used to vaporize other drugs as well such as "crack", methamphetamine, etc. And lastly, nicotine is a very addictive substance regardless of how it is consumed. Known for about the last 2,000 years, cocaine has been used and abused by politicians, scientists, farmers, warriors, and of course, on the street. Cocaine is derived from the leaves of a plant called Erythroxylon coca which grows in South America. Farmers go through the fields stripping the leaves from the plant three times a year. During the working day, the farmers chew the coca leaves to suppress appetite and fight the fatigue of working the fields. The leaves are transported to a laboratory site where the cocaine is extracted by a process called maceration. On the streets of the United States, cocaine can be found in two forms - one is the hydrochloride salt which can be "snorted" or dissolved in water and injected intravenously, the other is the free base form which can be smoked and is sometimes referred to as "crack", "rock", or "free base". The most popular method of administration of cocaine is "snorting" in which small amounts of cocaine hydrochloride are divided into segments or "lines" and any straw-like device can be used to inhale one or more lines of the cocaine into the nose. Although cocaine does not reach the lungs, enough cocaine is absorbed through nasal mucosa to provide a "high" within 3 to 5 minutes. Rock or crack, on the other hand, is heated and inhaled from any device available. Signs and Symptoms of Cocaine Use Dilated pupils Jitteriness Irritability Tremors Talkative Increased blood pressure the cocaine user, regardless of how the cocaine was administered, presents a potential life-threatening situation in the dental operatory. The patient under the influence of cocaine could be compared to a car going 100 miles per hour. Use of a local anesthetic with epinephrine in such a patient may result in a medical emergency. Such patients can be identified by jitteriness, irritability, talkativeness, tremors, and short abrupt speech patterns. These same signs and symptoms may also be seen in a normal dental patient with preoperative dental anxiety; therefore, the dentist must be particularly alert to identify the potential cocaine abuser. If a patient is suspected, they should never be given a local anesthetic with vasoconstrictor for fear of exacerbating cocaine-induced sympathetic response. No local anesthetic used by any dentist can interfere with, nor test positive for cocaine in any urine testing screen. Therefore, the dentist need not be concerned with any false drug use accusations associated with dental anesthesia. These phenomena also may be seen during toxic withdrawal from sedatives such as alcohol. There are, however, certain drugs that have as their primary effect the production of perception, thought, or mood disturbances at low doses with minimal effects on memory and orientation. These are commonly called hallucinogenic drugs, but their use does not always result in frank hallucinations. While nerve degeneration has not been well-demonstrated in human beings, the potential remains. Ecstasy became popular during the 1980s on college campuses and was used by some psychotherapists as an aid to the process of therapy, although very little controlled data is available. These drugs are now classified as Schedule I Controlled Substances and are no longer prescribed. Acute effects are dosedependent and include dry mouth, jaw clinching, muscle aches, and tachycardia. At higher doses, effects include agitation, hyperthermia, panic attacks, and visual hallucinations. Frequent, repeated use of psychedelic drugs is unusual and, therefore, tolerance is not commonly seen. However, tolerance does develop to the behavioral effects of various psychedelic drugs, and after numerous doses, the tendency towards behavioral tolerance can be observed. Folk lore claims this name comes from "molecule" because of the purity of the drug. These drugs are sympathomimetics and therefore might amplify the effects of vasoconstrictor. Patients who admit to using these drugs within the last 24 hours should not be administered vasoconstrictor. Adverse effects which may affect treatment include visual and auditory hallucinations, tachycardia, psychosis, fear, tremors, delirium, hyperglycemia, fever, sweating, flushing, euphoria, hypertonia, nausea, vomiting, coma, seizures, tachypnea, and respiratory arrest. Bath Salts (synthetic cathinones): these potentially deadly street drugs acquired the name bath salts, because they were packaged in containers that resemble the scented soaps that can be added to bath water. This action makes possession or selling of these chemicals illegal in the United States. These chemicals are synthetic forms of cathinone which is derived from the shrub Catha edulis (khat). There are several street terms for these crystalline chemicals; some of the more popular are "Ivory Wave," "Red Dove," "Vanilla Sky," and "White Lightning. The effects of the chemicals in "bath salts" have been described as a combination of cocaine, ecstasy, and methamphetamine. Psychological effects include insomnia, suicidal ideation, paranoia, agitation, and seizures. Since these medications are sympathomimetics, vasoconstrictors should not be used in individuals suspected to be under the influence of "bath salts. Nitrous oxide also is abused by food service employees because it is supplied for use as a propellant in disposable aluminum mini tanks for whipping cream canisters. Compulsive use and chronic toxicity rarely are reported, but there are obvious risks of overdose associated with the abuse of this anesthetic. Glue, correction fluid, gasoline, aerosol key board cleaners, model paint, in fact, any volatile substance has the potential to cause a "high" and like all of the above can become very addictive and deadly. According to the Monitoring the Future Surveys, abuse of inhalants peaks in the 8th grade and less so in the 10th or 12th grades. The dental team should be alert to the signs and symptoms of drug abuse and withdrawal. Some overlap between these sections has resulted from systemic conditions that have oral manifestations and vice-versa. Cross-references to the descriptions and the monographs for individual drugs described elsewhere in this handbook allow for easy retrieval of information. Example prescriptions of selected drug therapies for each condition are presented so that the clinician can evaluate alternate approaches to treatment, since there is seldom a single drug of choice. Drug prescriptions shown represent prototype drugs and popular prescriptions and are examples only. The pharmacologic category index is available for cross-referencing if alternatives and additional drugs are sought. For the practitioner, dental procedures can be accomplished more efficiently in a "painless" situation. Appropriate selection and use of local anesthetics is one of the foundations for success in this arena. Local anesthetics listed below include drugs for the most commonly confronted dental procedures. Ester anesthetics are no longer available in dose form for dental injections, and historically had a higher incidence of allergic manifestations due to the formation of the metabolic byproduct, para-aminobenzoic acid. The amides, in general, have a nearly negligible incidence of true allergic reactions, and only one well-documented case of amide allergy has been reported by Seng, et al. Although injectable diphenhydramine (Benadryl) has been used in an attempt to provide anesthesia in patients allergic to all the local anesthetics, it is no longer recommended in this context. The long-acting amide injectable, Ropivacaine (Naropin) may be useful for postoperative pain management. The use of preinjection topical anesthetics can assist in pain prevention (see also Viral Infections on page 1540 and Ulcerative, Erosive, and Painful Oral Mucosal Disorders on page 1544). Life-threatening adverse events such as arrhythmias, seizures, coma, and respiratory complications have been reported. OraVerse (phentolamine mesylate) injection is a local anesthetic reversal agent that accelerates the return to normal sensation and function following restorative and periodontal maintenance procedures. OraVerse is indicated for the reversal of soft tissue anesthesia (ie, anesthesia of the lip, tongue, and the associated functional deficits resulting from an intraoral submucosal injection of a local anesthetic containing a vasoconstrictor. OraVerse is not recommended for use in children <6 years of age or weighing <15 kg (33 lbs). Studies have shown, however, that neither of these reactions occurred in the children receiving the drug. According to the authors of the study, there was an impressive benefit:risk ratio suggesting a safe approach in accelerating recovery from soft tissue anesthesia in children (Tavares, et al. The adverse reactions were observed from study populations of 484 adults and 152 children. It should be anticipated that more adverse effects could occur as OraVerse is used in a larger number of patients. There is no information published on effects that occur with higher doses of OraVerse. Phentolamine is a very powerful alpha-adrenergic receptor blocker which can cause cardiovascular effects if inadvertently injected in high doses. The manufacturer advises to adhere to the recommended dosing for the OraVerse formulation. The dosing for OraVerse is based on the number of cartridges of local anesthetic with vasoconstrictor administered, with 1 cartridge of OraVerse containing 0. Dosing is as a 1:1 cartridge ratio to local anesthetic using the same injection site and administration technique as that used for the local anesthetic. Pain can be divided into mild, moderate, and severe levels and requires a subjective assessment by the dentist based on knowledge of the dental procedures to be performed, the presenting signs and symptoms of the patient, and the realization that most dental procedures are invasive often leading to pain once the patient has left the dental office. The practitioner must be aware that the treatment of the source of the pain is usually the best management. However, a patient who is not in pain tends to heal better and it is wise to adequately cover the patient for any residual or recurrent discomfort suffered. Likewise, many of the procedures that the dentist performs have pain associated with them. Much of this pain occurs after leaving the dentist office due to an inflammatory process or a healing process that has been initiated. It is difficult to assign specific pain levels (mild, moderate, or severe) for specific procedures; however, the dentist should use his or her prescribing capacity judiciously so that overmedication is avoided. The potential interaction between acetaminophen and warfarin has been recently raised in the literature. The cytochrome P450 system of drug metabolism for these vitamin K-dependent metabolic pathways has raised the possibility that prolonged use of acetaminophen may inadvertently enhance, to dangerous levels, the anticoagulation effect of warfarin. This potential interaction could be of importance in selecting an analgesic/antipyretic drug for the dental patient. The following categories of drugs and appropriate example prescriptions for each can be found in the Oral Pain - Sample Prescriptions chart. These include management of mild pain with aspirin products, acetaminophen, and some of the nonsteroidal noninflammatory agents (eg, ibuprofen).

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