Harry Snyder

• Lecturer, Health Policy and Management

https://publichealth.berkeley.edu/people/harry-snyder/

Between this two extremes lie all kinds of intermediate situations blood pressure medication and breastfeeding order micardis paypal, and the physician will need to consider the time factor when making decisions prehypertension prevalence best order micardis. The system works with a non-ideal response with a variable compliance heart attack mp3 purchase micardis toronto, the pressure/volume ratio is exponential and time-dependent blood pressure over 160 micardis 20 mg order with mastercard. Commonly used in the 1980s blood pressure medication side effects buy generic micardis 40 mg, these indices are now rarely applied but serve to understand the logarithmic relationship between pressure and volume: the higher the volume, the better the compliance and therefore the more tolerant the system to volume loads. The first positive deflection, P1 (percussion wave), corresponds to the arterial pulse wave and represents the arrival of blood to the intracranial cavity. The second wave, P2 (volume wave), is considered a reflex of intracranial elastance. Normally, the amplitude of P1 is higher than that of P2; however, in situations of greater elastance or decreased compliance, P2 increases in relation to P1. The magnitude of this change is a measure of intracranial compliance, constituting the so-called compliance auto-test. When we have a space occupying lesion, the arterial pulse constitutes a real volume load. From cerebral pulse wave analysis we can infer in what sector of the compliance curve we are. A high amplitude (10 or 15 mmHg) pulse wave indicates a volume load in the ascending slope of the compliance curve. According to its description they were ominous, with duration between 5 and 20 minutes, with an amplitude >50 mmHg, reaching values of 100 mmHg. B Lundberg waves last between 2 and 5 minutes, with an amplitude >20 mmHg, reaching 50 mmHg. Their clinical meaning is less accurate than A waves, but are warning signs that show a decrease in intracranial compliance. Type C waves, (Hering Traube), are of short duration, with low amplitude (<20 mmHg) and show arterial curves; their clinical meaning is unknown. The phenomenon of periodic waves is essentially a physiological event, as has been demonstrated by transfontanel recording in normal neonates. It is generally of vasogenic origin, emerging from the normal vasomotricity of normal circulation and that of the brain circulation in particular. Detailed study of the chronobiology that initiates a wave of this type is essential for determining its mechanisms. With simultaneous multimodal monitoring and multichannel recording it is possible to determine whether it corresponds to cerebral autoregulating events that normally originate the wave or to a phenomenon of autoregulation loss. Its magnitude is higher in patients with cerebral atrophy and increased subarachnoid space. The venous vessels are collapsible structures that displace a considerable volume, decrease their volume, and transfer their pressure to the dural sinus. When these two systems are overwhelmed, however, the ensuing structural changes lead to a major alteration in intracranial physiology: the arteries produce ischemia and the parenchyma is displaced. It is this distortion or displacement that determines hernia with occlusion of the compartments. So we move from an initial exponential curve to its most vertical phase of cerebral tamponing. Each of these situations can be clearly identified with a transcranial Doppler study. Displacement occurs earlier than the herniation syndrome, as magnetic resonance imaging studies have shown. Early displacements were found to have a close correlation with neurologic deterioration and deepening coma. The main consequences of displacement are brainstem angulation and distortion, which ultimately define the severity. Also, displacement can cause ischemia by direct vascular compression in diverse topographies, as occurs in transtentorium hernia or in occipital infarction, by compromising the posterior cerebral artery. Deviation or displacement of the cerebral parenchyma is produced by intracranial pressure gradients. The existence of gradients between the supratentorium and the infratentorium and between the posterior cranial fossa and the subarachnoid spinal space have been observed and confirmed in both experimental models and by clinical assays. There are also gradients inside the supratentorium compartment, between both hemispheres (interhemispheric gradients) and inside each hemisphere (transhemispheric gradients). The gradients originate mainly when there is a space-occupying lesion and depend mainly on its growth rate and they tend to disappear with time. The reduction and disappearance of the gradients over time could be related to brain relaxation and accommodation to this new volume. This occurs because of focal pressure elevations, which possess intracerebral gradients, in the dura mater, which is inextensible, distends inwards. The herniation syndrome is produced only by cerebral distortions in the horizontal plane or distortions in the vertical plane, without a part of one compartment moving to other to cause hernia, which would be a final event. A close relationship has been identified between consciousness level and midline distortions. The difference between hematoma and hemorrhage is that a hematoma arises where there is no pre-formed cavity. In hydrocephalus of osseous causes, bone thickening occurs in some hereditary forms of anemia which reduce compliance. Rekate [Rekate, 2008] proposed a definition to take as a starting point for future debates. This definition implies an active process, which excludes cerebral atrophy and hydrocephalus ex-vacuo, and in general implies ventriculomegaly. Hydrocephalus can exist without ventriculomegaly and ventriculomegaly without hydrocephalus, as occurs in cerebral atrophy. This form is seen in older patients, in which the spaces where the liquid circulates are dilated. Such patients present a reduction in parenchyma volume and there is no resistance to circulation or liquid absorption. It constitutes a brain tissue monomorph and a self-response or stereotyped response to multiple forms of acute injury, both structural and metabolic. Strictly defined, it is an increase of water content in the extravascular tissue due to an increase of water in either the extracellular space or the intracellular space alone or both. Clinically, however, brain edema usually refers to an increase in cerebral volume. Therefore, to employ the same terminology, we will use the term brain swelling (or brain bulk enlargement in the English language literature) to describe increased brain volume or brain mass due to: · Augmented vascular volume: arteriolar dilation or venous obstruction. At the cellular level, several different patterns reflect different etiopathogenic mechanisms. This increase in vascular permeability also produces plasmatic extravasation, rich in proteins which end up collecting mainly in the extracellular space of the white matter and subsequently in the glia. Vasogenic edema tends to be peri-focal, circumscribed to the initial lesion, but progresses towards unharmed white matter by diffusion and tissue pressure gradient. This holds therapeutic importance because increments in the main arterial pressure, even more so when associated with disturbed autoregulation, increase vasogenic edema. The underlying mechanisms are complex and include cellular metabolic disturbances, with the accumulation of intracellular sodium due to a dysfunction of the ionic pumps which bring liquid from the extracellular space. The main causes are: brain ischemia, brain hypoxia, neurotrauma, meningitis, hyperosmolar states. Osmotic edema is a cellular and interstitial edema linked to a rapid and sharp decrease in serum osmolarity, as occurs in hyponatremia. It accumulates around the peri-ventricular white matter, assuming a crest form from the frontal and occipital horns. Ransohoff described this type of hydrocephalus as "extra-ventricular obstructive hydrocephalus", resulting from obstruction involving the cortical subarachnoid space. Another condition considered as hydrocephalus is external hydrocephalus, in which a new space is created, usually in the subdural space, where liquid is secreted and is in communication with the arachnoid space. In many situations, however, even if we reduce the pressure, but the diameter is large, the tension will not drop. Therefore, we must wait for the tension to decrease before a proper effect can be obtained. In normotensive hydrocephalus, the pressure is already adjusted at the expense of a larger diameter (larger space) and a subsequently higher tension. And this is done by decreasing the pressure while waiting for the tension to fall and the diameter to adjust. Oftentimes the pressure must be reduced to subnormal values or even to negative values to reduce tension and ventricle diameter. Another effect of hydrocephalus is hypertensive and has a certain evolution in the apparition of a white matter peri-ependimary edema due to an interstitial absorption deficit which is observed as crests around the frontal and occipital horns. Pseudonormal pattern syndrome with hydrocephalus + cerebral edema: in this case, there are two concomitant processes: cerebral edema (of different etiology) and an alteration in liquid circulation. Therefore, we will have two forces, the centripetal force caused by the brain edema and the centrifugal force caused by the hydrocephalus. And we will have an enormous pressure within the balance state but with normal ventricles because they are two similar forces with different signs, i. The tentorial notch: anatomical variation, morphometric analysis, and classification in 100 human autopsy cases. Seminars in Neurology 2008; 28: 690-702 Czosnyka M, Smielewski P, Piechnik S, et al. Hemodynamic characterization of intracranial pressure plateau waves in head-injury patients. Multiplicity of cerebrospinal fluid functions: New challenges in health and disease. Predominance of cellular edema in traumatic brain swelling in patients with severe head injuries. A review of progress in understanding the pathophysiology and treatment of brain edema. Interhemispheric supratentorial intracraneal pressure gradients in head-injured patients: are they importante Frequently, the process that leads to secondary injury is cerebral edema, the ubiquitous alteration of normal intracranial fluid and electrolyte balance. The focus of this chapter will be to delineate the mechanisms that lead to cerebral edema as well as how it is measured, and its various treatments. Edema can be categorized by the anatomic and physiologic failure that leads to the accumulation of fluid; however, these distinctions may over simplify the reality of the pathology. The understanding of the biochemistry of cerebral fluid balance is in its infancy, but recent investigations in to neural water channels have advanced our understanding and will hopefully lead to new interventions. The first step in understanding cerebral edema is to explore why its effects are so detrimental. Interstitial accumulation of fluid or "third-spacing" is common in liver failure or with sepsis. With these other organ systems, edema can lead to a reversible impairment of normal function which may require intervention; however, in general, the accumulation of fluid does not lead to further injury. Cerebral edema is of an even greater concern in comparison to systemic edema due to the rigid design of the skull. This has obvious survival advantages from traumatic insults; however, it limits expansion of tissue making the brain susceptible to the effects of compression and herniation. In the case of pulmonary edema, the lungs hyperventilate and the heart increases its output. The limitations of skull chamber compliance were first described in the late 18th and early 19th century and donned the "Monro-Kellie doctrine" or the "Monro-Kellie hypothesis. If there is an intracranial lesion increasing the contents of the skull it must be at the expense of one of its components or an increase in intracranial pressure will occur. As the intracranial pressure increases, brain perfusion may be compromised leading to global ischemia. Furthermore, the dura and tentorium form 511 Intensive Care in Neurology and Neurosurgery Herniation syndrome Subfalcine Transtentorial (uncal) Cerebeller (tonsilar) Central herniation Manifestations Cingulate gyus herniates under falx cerebri; may compress anterior cerebral artery and cause contralateral lower extremity paresis Herniation of mesial temporal lobe/uncus causing ipsilateral third nerve palsy and contralateral hemiparesis Herniation of cerebellar tonsils through foramen magnum, with compression of medulla oblongata Downward herniation of prosencephalon compressing diencephalon and mesencephalon Table 26. Herniation is described in a set of classic syndromes: subfalcine, transtentorial (uncal), cerebellar (tonsilar), and central herniation (Table 26. Edema is an unfortunate companion to most intracranial pathologies, and as disparate are the types of insult as are the ways they may disturb fluid balance. The various etiologies do have in common a similar scheme of inflammatory mediators such as glutamate, free oxygen radicals, kinins, lactate and simple ions exacerbating the edema. Previously, each type of lesion was categorized under a single mechanism; for example, vasogenic edema in tumor and cytotoxic edema in stroke. As you read the following sections, keep in mind that all of these distinctions are artificial designations for a disease process that we still do not fully understand. This creates an isolated environment with its own water and electrolyte balance providing protection from systemic disturbances and invading pathogens. If the barrier is disturbed, solute and water can enter the brain parenchyma leading to edema. Often the extent of the barrier disruption is proportional to the amount of edema it causes. While traditionally thought to close in a biphasic pattern corresponding with ischemia and reperfusion, the barrier disruption may be monophasic and open for more than a month [1]. With tumor, direct mechanical disruption of the barrier can occur, or production of vasoactive and endothelial factors can lead to edema. With excessive blood pressure, the autoregulatory mechanism of the cerebral vasculature may be overwhelmed and fluid 512 Cerebral Edema: State of the Art will leak in to the parenchyma due to Starling forces. Also included in the vasogenic category is cerebral venous thrombosis associated with hypercoagulable states (including pregnancy and oral contraceptive use as well as intrinsic coagulopathies) leading to a vascular back pressure causing intraparenchymal hemorrhage as well as edema. At high altitudes a special condition can occur as part of acute mountain sickness. In this category, the sodium/potassium ion exchanger fails leading to an alteration of the normal osmotic balance between the intracellular and extracellular compartments. As cell components degrade and free proteins accumulate, a further increase in intracellular osmolality occurs leading to a water shift termed cytotoxic edema.

If whole uterus comes outside the vagina is called 3rd degree prolapse or Procidentia uteri blood pressure smoothie 80 mg micardis buy fast delivery. It is a ridge on the posterior aspect of the uterus blood pressure of 10060 buy micardis 80 mg line, opposite the isthmus blood pressure nose bleed purchase micardis without prescription, at the junction between cervix and body hypertension goals buy cheap micardis 40 mg. The mucous membrane of the cervix on the midline heart attack signs generic micardis 20 mg buy online, there is a median longitudinal fold is present. Along the anterior and posterior walls of the cervical canal from these longitudinal folds numerous transverse folds passes upwards and laterally. The arrangement of median longitudinal fold with the palmate folds resembling the branches of a tree. It fundus is more tilted to the right pelvic wall, due to the pressure of sigmoid colon. Sometimes cervical glands of the uterus blocked and secretion produces cystic dilatation of the glands which buldge in to the cervical canal, this feature is known as Nabothian cyst. Cornu of uterus is the outwards projection from the junction of the fundus and the body. It is a fold of peritoneal pouch between the anterior surface of rectum and posterior surface of uterus. So tortuous uterine artery become straight without any chance of rupture or tearing. An opening present in the ovarian fimbriae for entry of ovum in the fallopian tube is called the pelvic ostium. It is the junction between the upper mobile part and lower fixed part of the uterus b. Isthmus plays the important role in lower part of upper uterine segment during delivery or labor. If the uterus is retroverted, during pregnancy there is most common chance of prolapse of uterus. It is a condition when fertilized ovum fails to migrate in to uterine cavity and may produce, rupture of the fallopian tube with alarming hemorrhage. If uterine tube is filled with a bag of pus, due to infection of tube, the condition is called pyosalpinx (pyopus, salpinx - uterine tube /fallopian tube). Its involvement in perineal tear during parturition may produce prolapse of the following: a. In the submucous coat of appendix, contains excessive lymphoid tissue, that is why it is called abdominal tonsil. Medially: Lateral border of rectus abdominis Laterally: Inferior epigastric artery. A congenital weakness produced by the descent of the testis and as right testis descend later than the left testis. In hernia an organ or part of an organ must cover by the peritoneum but in prolapse there is no peritoneal covering. Large intestine · Cecumwithappendix · Ascendingcolon · Rightcolicflexure(hepaticflexure) · Transversecolon(horizontalcolon) · Leftcolicflexure(splenicflexure) · Descendingcolon · Pelviccolonorsigmoidcolon · Rectum · Analcanal 9. It is the transverse fracture occurs at the lower end of the radius due to fall on the outstretched hand. Ulnar notch of radius: Joints with the lower end of ulna forming the distal radioulnar joint. Lateral triangular area articulate with scaphoid and medial quadrangular area of the radius articulate with lunate and forming the radiocarpal part of the wrist joint. Because these muscles form a musculotendinous rotator cuff around the shoulder joint. Cause: Due to sprain of the common tendinous origin of the superficial extensor muscles of the forearm: Sign and symptoms: a. It is a triangular interval or gap communi cates the axilla with the root of the neck, directed upwards and medially. It is the most common type of nerve injury during birth at the upper trunk of the brachial plexus. Radial nerve is injured by the pressure due to sleeping in an arm chair with the upper limb hanging by the side of the chair commonly by a drunkard. Explain the clinical conditions in which the axillary nerve is likely to be injured. Axillary nerve may be injured, due to the dislocation of the shoulder or fracture of the surgical neck of the humerus as this nerve is intimately related to the surgical neck of the humerus. Contour of the shoulder is lost, with the more prominent greater tubercle, due to wasting of the deltoid. Carpal tunnel syndrome: In this syndrome median nerve is affected and following are the results: a. Difficulty in performing fine move ments of the thumb like buttoning the shirt, gripping the toothbrush, etc. During preRoentgen days the triangle of auscultation on the left side, the auscultation was practiced to hear the splashing sound of the swallowed fluid to diagnose the esophageal obstruction. Due to interruption of blood supply of the head which leads to necrosis (artery supply medial circumflex femoral artery). In old age reduction of calcar femorale and compact lamella in the neck due to neck femur with insignificant trauma. Structures passing through the shallow groove between the anteriorinferior iliac spine and the iliopubic eminence. Femoral vessels and nerves: Here, iliacus laterally and psoas major lies medially. Also, the femoral artery in front of the psoas tendon and femoral nerve lies between the iliacus and psoas tendon. With the free movement of flexion and extension this joint also has some degree of rotation. Recurrent dislocation of the patella commonly occurs laterally, due to weakness of the lower portion of the vastus medialis and if congenitally poor development of the lateral femoral condyle. It occurs in the subcutaneous prepatellar bursa, commonly who are in the habit of doing works by kneeling on floor. Accessory movements: · Adduction · Abduction · Rotation · Side-to-sideglidingmovements. Medial and Lateral walls: Fused with the anterior and posterior walls of the sheath. When glutei especially gluteus medius and minimus become weakend causes hip to droop when affected limb is held off the ground in erect posture, result is the body walk from sidetoside as each step is taken. It is the strongest tendon in the body, which is the common tendon of insertion of the gastrocnemius, plantaris and soleus muscle. After that it is gradully rounded at the point 4 cm above the calcaneus then expanded and lastly it is inserted on the middle of the posterior surface of the calcaneum. Confluence of sinuses: At the point of union between the transverse sulcus with the sagittal sulcus. Superior petrosal sinus: At the groove on the superior part of the petrous part of temporal bone. Communicate with meningeal veins, veins of pericranium and veins of dural sinuses. When vessels of the scalp are torn in wounds they are unable to retract and produce profuse bleeding due to following reasons: a. This second layer firmly connects between the skin with the epicranius and its aponeurosis. As the anesthetists used these arteries who are sitting at the head end of the patient being operated. Inner True capsule: It is formed by the condensation of the fibrous stroma of the gland. From the medial surface of the lateral lobe of the thyroid gland to the cricoid cartilage, the false capsule of the gland is thickened to form the Ligament of Berry that is why the gland moves up and down with deglutition. These structures bear a special relationship from the point of view of development, configuration, anatomy and localization. Therefore, it is essential that the health personnel in charge of the initial management of these patients possess a basic knowledge of brain anatomy for an adequate understanding of the process underlying neurological impairment after acute brain injury. The "cranial membrane" chondrifies (day 38) and by day 54 begins to ossify from 110 bone centres, generating 45 bones in the newborn, with subsequent fusion for the development of the 32 bones composing the adult cranium. Cranial growth is determined by the growth of brain tissue, which "pushes forward" ossification of the structures. Around the first year, 90% is completed and adult size may be reached at an age of about 6 to 7 years. But after 4 years of age it is divided by the diploë, thus setting the basis for the so-called inner and outer cortical plates. The cranial "sutures" (remnants of the cranial growth centres) are active during labour. Afterwards, they follow cranial growth, which occurs especially during the first 3 years of life and permanently closes at about 6 years of age. They are divided in to major (metopic, lambdoid, sagittal and coronal) and minor (squamous) plates located between the temporal bones. Between the sutures are the fontanels (spaces between the sutures) where ossification completes. Internal axial view of the base of the skull (anterior, middle and posterior cranial fossa) with major holes of the base [1]. Once chronological maturity is reached, the cranial vault is divided in to a group of four unpaired bones (frontal, ethmoid, sphenoid, and occipital) and two groups of paired bones (temporal and parietal). Within these anatomical structures we will detail foramina or holes that lead to vascular and neural key structures. In the sphenoid bone is the foramen rotundum, from which the second portion of the V2 trigeminal nerve or superior maxillary nerve emerges from the cranium. The foramen ovale, through which the lesser petrosal nerve, the third portion of the trigeminal nerve, V3 or lower mandibular nerve emerge and the accessory meningeal artery enters and the foramen spinosum, through which the meningeal nerve (branch of V3) emerges and the middle meningeal artery enters (very important in trauma, as it is one of the most common causes of epidural bleeding). If bleeding is out of control, this orifice usually has to be plugged with hemostatics to isolate the extracranial portion and stop the bleeding. It is also important to consider some cranial landmarks employed to demarcate coordinates and approaches. On day 28, the neural development of the embryo is in the so-called "3-vesicle" stage: · the prosencephalon (forebrain) gives rise to the telencephalon (cerebral hemispheres) and diencephalon (third ventricle, thalamus and hypothalamus). The neural tube then continues its development as the spinal cord and vertebral column. Around day 35 of gestation, the 3-vesicle embryo progresses to the 5-vesicle stage (telencephalon, diencephalon, mesencephalon, metencephalon and myelencephalon), and at day 180 starts forming sulci through growth and myelination. The meninges, in turn, form two structures, the neural crest (arachnoid and pia mater) and the mesenchyme (dura mater). The final weight of the brain on completing growth is around 1300 g in women and 1400 g in men. Growth is set to fully develop structures of the neo-cortex such as the frontal lobes, where social learning is developed. The growth of association fibres occurs mainly through three structures: the fornix, corpus callosum and anterior commissure. The general divisions of the cerebral lobes are formed from the fissures (deeper sulci), and within each lobe there are subdivisions (gyri or convolutions) formed by less deep or smaller sulci. The central or Rolandic fissure starts inside in the middle of the hemisphere and is directed downward and forward to join the Sylvian fissure. The calcarine fissure begins at the internal occipital pole and continues forward to the parieto-occipital sulcus. The sulcus callosomarginalis, the Sylvian fissure, the parieto-occipital sulcus and the collateral sulcus are the only ones with 100% continuity. These, along with the Rolandic and the calcarine fissures, the pre-central and the inferior temporal sulci, are the only anatomical grooves that are generally constant and present a uniform pattern in human anatomical studies [1-3]. The frontal lobes are located between the Sylvian, the Rolandic and the sulcus callosomarginalis. The parietal lobes start from the Rolandic fissure and end in the external projection of the parieto-occipital sulcus and above the projection of the Sylvian fissure. The temporal lobes are below the Sylvian fissure and are separated from the occipital lobe by an imaginary line. They have five sulci: the superior temporal; the middle temporal; the inferior temporal; the rhinal; and the collateral. On its basal face is the "uncus" of the hippocampus, in its anterior and posterior portions, a key structure in the development of uncal herniation due to displacement of this structure against the third cranial nerve and against the cerebral peduncle in the midbrain, thus compromising pupillary contraction (dilated pupil) and the pyramidal motor pathway (contralateral hemiparesis), peculiar of this syndrome. There is a lobe within the interior of the temporal lobe called the insular lobe or Island of Reil. It is at the bottom of the Sylvian fissure and is triangular in shape, with an anterior inferior apex and a superior base. The occipital lobes have a major sulcus (calcarine fissure) and two minor sulci: the transverse occipital and the temporal occipital [1-3]. In particular: · Corpus callosum: about 7 to 10 cm long, located along the ventricular system, and consists of four parts: the rostrum (adjacent to the lamina terminalis); the knee linking the frontal lobes; the body joining the parietal and temporal lobes; and the splenium joining the temporal and occipital lobes. It is separated from the forebrain by the cerebellar tentorium, which is a splitting of dural tissue that separates the supratentorial from the infratentorial structures (anterior and middle fossae from the posterior fossa). It measures about 6 x 10 x 4 cm and weighs 140 g, which corresponds to 10% of brain weight. It connects to the brainstem via three branches or peduncles: the superior cerebellar or "brachium conjuntivum" (which joins the midbrain); the middle cerebellar or "brachium pontis" (which joins the pons); and the inferior cerebellar or restiform body (which joins the brainstem). Functionally, the division is established through three lobes: anterior (posture and tone fibres); posterior (vestibular fibres of balance); and medium (fibres of voluntary movement) [1-4]. The brainstem consists of four structures: the diencephalon; the midbrain; the pons; and the medulla oblongata. Its side wall is formed by the two thalami; the anterior side is the anterior commissure, the posterior side is the pineal gland and the posterior commissure; the base is formed by the tela chorioidea located between the two thalami, and the vertex is above the pituitary gland.

It is connected with the body by the two roots blood pressure chart log excel micardis 20 mg without prescription, which enclose between them the optic canal heart attack zine order micardis with amex. Inferior or Orbital Surface Forms the superior boundary of superior orbital fissure heart attack untreated buy generic micardis pills. It ends medially in to a bony process called anterior clinoid process Attachment: Free border of the tentorium cerebelli heart attack get me going generic 80 mg micardis fast delivery. It is divided in to three compartments by the attachment of annulus tendinous communis blood pressure higher in one arm cheap micardis 40 mg online. Posteriorly the pterygoid plates diverge each other and forms a wedge shaped fossa called pterygoid fossa. Anterior border Upper part: Non-articular forms the posterior boundary of pterygopalatine fissure in articulated skull. The two pterygoid processes represent the legs of the bat (as sphenoid bone resembles a bat). Inferiorly anterior border of two pterygoid plates are separated and forms a triangular gap called pterygoid fissure. Medial surface Pterygoid hamulus: Lower end of medial pterygoid plate curves laterally to form a hook shaped process known as pterygoid hamulus. Whole border articulates with the posterior border of the perpendicular plate of palatine bone. Processus tubarius: A projection in the midpoint of the posterior border supports the pharyngeal end of pharyngotympanic (auditory) tube. It is the upward prolongation of medial surface of medial pterygoid plate pass to the under surface of the body of sphenoid as thin lamina. Anteriorly with the inferior aspect of the vaginal process presents a groove, which is converted in to palatinovaginal canal after articulating with the sphenoidal process of the palatine bone. Superior aspect of the vaginal process with the ala of the vomer forms the vomerovaginal canal. Lateral surface: It forms the medial aspect of pterygoid fossa and related to tensorveli palatini muscle. Sagittal sulcus: Opposite the sagittal border it presents a longitudinal shallow groove, which with a similar groove on the opposite side forms sagittal sulcus. Groove for anterior division of middle meningeal artery: It begins from the inner surface of anteroinferior angle and soon divides in to two. Sagittal Border/Superior Border It is longest, thickest, thickly serrated and straight. Anterior portion: Bevelled outwardly and articulates with greater wing of sphenoid bone. Intermediate portion: It is arched and bevelled outwardly and articulates with squamous part of temporal bone. Posterior portion: It is straight and thickly serrated and articulates with mastoid part of temporal bone. Four angles External Surface It is convex, near its center presents a rounded eminence known as parietal tuberosity. Area above the superior temporal line covered by galea aponeurotica (epicranial aponeurosis). Parietal foramen: About 5 cm in front of occipital angle, close to the superior border, there is a foramen called parietal foramen. It is marked by impressions of the cerebral gyri and branches from the middle meningeal vessels. It is also thick, serrated and articulates with lambdoid border of the squamous part of the occipital bone. A blow to the side of the head may fracture the bones forming the pterion which causes rupture of the anterior division of middle meningeal artery results is extradural hemorrhage, which causes pressure on the motor area producing hemiplegia of the opposite side of the body. Th consists of two different segments of bone which unite by suture opposite the median plane usually after birth as growth continues. The line of fusion or suture becomes osseously continuous with each other in fully formed bone. But in certain, percentage of cases (9%) remains of the frontal or metopic suture exist opposite the lower part of median plane. It is situated one on each side of median plane about 3 cm above the supraorbital margin. Two arched eminences, immediately above the supraorbital margins, one on each side called superciliary arches. It is the lower or orbital border of squamous part and presents two notches or foramens. Supraorbital foramen or notch: junctional region of medial one-third and lateral two-thirds. Transmits: Supraorbital nerve, vessels and frontal diploic vein (it passes through a minute foramen on the supraorbital foramen or notch). Superior and inferior lines: the line curved upwards and backwards from the zygomatic process soon divides in to superior and inferior temporal lines. Below the glabella and between the supraorbital margins the portion of the bone projecting downwards called nasal part of frontal bone. From the lower part of nasal notch, opposite median plane a pointed process projects downwards called nasal spine. On either side posteriorly it presents a narrow grooved area, which forms the roof of the corresponding nasal cavity. Internal/Cerebral Surface It is deeply concave and is occupied by the frontal lobe of the cerebral hemisphere. Opposite the median plane this surface presents a shallow groove called sagittal sulcus. Frontal crest: the margins of the sagittal sulcus as they descend downwards converge together and are joined to form a crest called frontal crest. Granular foveolae (pits): Close to the sagittal sulcus there are numerous granular foveolae. Which articulates with the alae of the crista galli of the ethmoid bone and forms a foramen called foramen cecum. Transmits: An emissary vein connecting the superior sagittal sinus with the veins of the nasal mucosa. Inferior temporal line together with fossa and the surface below it Attachment: Origin of temporalis muscle. The rough triangular articular area behind the zygomatic process in the lower part of the border articulates with greater wing of sphenoid bone. Which are separated from each other by ethmoidal notch and forms roof of the orbit. In articulated skull it is covered by the cribriform plate of the ethmoid bone ii. Margins of the notch presents broken air cells, articulates with the upper surface of the labyrinth of the ethmoid bone to complete the ethmoidal air sinuses. Its medial portion below the medial end of supraorbital margin presents a fossa called trochlear fossa. Attachment Fibrocartilaginous pulley of the superior oblique muscle of the eyeball. Posterior Border this border articulates with the anterior border of the lesser wing of sphenoid bone. They are present between the diploic layers of the frontal bone opposite region of glabella and the superciliary arches. One point on the supraorbital margin at the junction of medial one-third and with the lateral two-thirds. Communication: It communicates with the middle meatus of nose of the corresponding nasal cavity through the frontonasal duct. Foramen cecum sometimes transmits an emissary vein, which communicates between the superior sagittal sinuses with veins of nasal mucosa. In case of increased intracranial blood pressure the nasal bleeding (epistaxis) acts as safety valve and prevents vascular damage of the brain. If fracture occurs in the orbital plate of frontal bone result is collection of blood beneath the conjunctiva and in the orbital cavity producing exophthalmos. A blow (during boxing match) to superciliary arches as they are sharp bony ridges may lacerate the skin and cause profuse bleeding which causes blood accumulate surrounding the orbit which gravitate in to upper eye lid producing a condition called black eye. Metopic suture: In most of the cases union between the two halves of frontal bone begins in the second year and union completed in the eighth year, but in 9% cases union does not take place properly and the condition called metopic suture. Lower part of this surface presents of ridges produced by the sockets of the upper teeth. Area between the infraorbital foramen and infraorbital margin Attachment: Origin of levator labii superioris. Nasal notch: Anteromedially the anterior surface separated from the medial surface by a thin concave margin called nasal notch. It also forms three-fourths of the hard palate, greater part of the floor of the orbit, greater part of the floor and lateral wall of nasal cavity and part of the bridge of the nose. In articulated skull it forms the infratemporal and pterygopalatine fossae and forms the pterygomaxillary and the infraorbital fissures. Alveolar canals: Near the center this surface is perforated by two or three small foramina called alveolar canal. Close to the posteroinferior angle this surface presents a rough articular area called maxillary tuberosity. Opposite the middle of the posterior border of the posterior surface is the upper end of the vertical groove known as greater palatine groove. It is smooth and triangular in shape and forms the greater part of the floor of the orbit. It is continuous medially with the lacrimal crest of the frontal process of maxilla. It presents a free posterior border, which forms the lower boundary of the inferior orbital fissure. The medial margin of the orbital surface anteriorly presents a notch the nasolacrimal notch, which is converted in to the upper opening of the nasolacrimal canal by articulation with lacrimal bone. It presents on the rounded margin which separates the orbital surface from the posterior surface. It leads to infraorbital canal which ends in infraorbital foramen on the anterior surface. The anterior and medial part of this surface just lateral to the nasolacrimal groove presents a small depression. It forms the lateral wall of the nasal cavity and represents the base of the body of maxilla. On the upper and posterior part of this surface presents maxillary hiatus which leads in to maxillary air sinus. Broken air cells (ethmoidal): Situated above the hiatus and completed by labyrinth of ethmoid and lacrimal bones. Behind the maxillary hiatus the medial surface presents a rough area which articulates with perpendicular plate of palatine bone. Traversing this rough area there is a vertical groove the greater palatine groove which is converted in to greater palatine canal with a similar groove on the lateral surface of the perpendicular plate of palatine bone. Fractures of the Zygoma or Zygomatic Arch the zygoma or zygomatic arch can be fractured by a blow to the side of the face. Although, it can occur as an isolated fracture, as from a blow from a clenched fist, it may be associated with multiple other fractures of the face, as often seen in automobile accidents. It arises from the junction of nasal surface and its alveolar process and joins with the palatine process fellow of opposite bone to form the anterior three-fourths of the hard palate. Superior surface: It is smooth and concave from side-to-side and forms major part of the floor of the nasal cavity. At the lateral area posteriorly it presents a groove for greater palatine vessels and nerve. Opposite the incisor teeth it presents a small depression, which together with the fellow of its opposite side forms the incisive fossa. At the bottom of which there is a canal on each side of median plane called the incisive canal. Posterior border: It is serrated for articulation with the horizontal plate of the palatine bone. It articulates above with the nasal margin of frontal bone, in front with nasal bone and behind with lacrimal bone. Lateral surface: Divided in to two areas anterior and posterior by anterior lacrimal crest. It projects from the junction of anterior, posterior and orbital surfaces of the body. Attachment: Origin of buccinator from posterior part of outer surface up to the first molar tooth. Maxillofacial fracture: Maxilla usually fractures as a result of massive facial trauma. Chance of leakage of cerebrospinal fluid (cerebrospinal rhinorrhea), which is secondary to fracture of the cribriform plate of ethmoid bone. Injury of the infraorbital nerve results in anesthesia or paresthesia of the skin of the cheek and upper gum. Blowout fracture of maxilla: A severe blow to the orbit may cause the contents of orbital cavity to burst downwards through the floor of the orbit in to the maxillary air sinus. In this fracture a fragment of bone is depressed inward to compress or injure the brain 7.

It has a very important relevance arterial blood pressure 20 mg micardis purchase with mastercard, more than other proteins digital blood pressure monitor discount 40 mg micardis, and is also used in monitoring the patient arrhythmia when sleeping micardis 20 mg without a prescription. Techniques for measuring visceral proteins do not provide an accurate assessment of nutritional status arteria basilaris cheap micardis 80 mg without prescription, as they are influenced by factors other than malnutrition blood pressure medication joint pain order micardis mastercard. There is a direct correlation between albumin, transferrin and fibronectin depletion with higher morbidity and mortality, delayed healing and decreased resistance to infection. A patient is considered immunocompetent when he has a good response (>5 mm) to two or more antigens. These tests are less useful in patients with cancer, cirrhosis or in those under immunosuppressive therapy, because they may be incompetent due to the immunological condition itself, even when nutritional status is adequate. The result indicates the probability of occurrence of complications due to malnutrition, the most important of which is sepsis. Nutrients (carbohydrates, fats and proteins) are transformed to provide the energy needed 402 Nutritional Support in Critically Ill Patients for body functions. This formula has the advantage that it can be rapidly calculated and is easy to apply, although errors of up to 30% of total calories have been reported. Barbiturates, propranolol and muscle relaxants can decrease hypermetabolism, although this has not proved to influence the prognosis. The combustion characteristics of each nutrient are related to its chemical structure. If the objective is to achieve anabolism and weight gain, 1000 kcal should be added to the calculated value, which will increase a weight gain of approximately 1 kg or 2 pounds per week. When carbohydrates are used as the sole source of energy, the needs are around 500 up to 650 g/day. Total carbohydrates should be calculated at a rate of 2 g/kg/day in normal patients and 4-6 g/kg/day in hypercatabolic conditions. To avoid problems caused by the use of carbohydrates as the sole source of energy, it is recommended to associate them with fats, which have multiple functions, as well as 405 Intensive Care in Neurology and Neurosurgery providing metabolic energy reserve in the adipocytes. Also, phospholipids are formed in the cell membrane and act as intracellular modulators (prostaglandins). Lipids can be used two times per week, with the aim of providing essential fatty acids (linoleic acid), or administered as an energy source, thus supplying some of the calories calculated. The daily fat requirement is 1 to 2 g/kg/day under basal metabolic conditions, which is higher in catabolic situations (3-5 g/kg/day). Fat emulsions are not well tolerated in certain clinical situations, such as Gram-negative sepsis, neonatal hyperbilirubinemia and carbohydrate and lipid metabolic disorders. They then enter the lymphatic system and finally the blood, where they are distributed to the tissues. They then go directly to the portal vein and are transported to the liver and other tissues as free fatty acids or bound to albumin. They have the advantage of not being stored as fat in the body and are oxidized quickly and completely. They should not be used in patients with liver cirrhosis, as the medium-chain fatty acids are metabolized in the liver and liver function is reduced. Octanoic acid accumulates in these patients, so symptoms may appear similar to hepatic encephalopathy. In the body there is usually a loss of protein due to the synthesis and degradation of body proteins. The main protein losses occur through the urine and feces, the latter due to intestinal secretions and cell desquamation. In addition, there is minimal loss through the skin and during menstruation in women. In this particular situation, a ratio of nonprotein calories per gram of nitrogen (100 to 150/1) must be maintained. In septic patients this ratio should be 80 kcal of nonprotein nitrogen per gram of nitrogen. Using tables that show the daily losses of nitrogen in different clinical situations (replacement must equal losses). Measured urea in 24-hour urine: nitrogen excretion in urine is the final product of protein metabolism to obtain energy; therefore, the protein requirements can be determined by calculating the daily losses of nitrogen from the elimination of urea in 24-hour urine. For the proper calculation of nitrogen excretion, a steady diet should maintained for 24 to 48 hours beforehand. Urea in 24 ­ hour urine (g/24 hours) = urine volume (l/24 hours) x urea in urine (g/l) the urea molecule is not entirely composed of nitrogen. When using amino acids as a nitrogen source, some measures should be taken in to account: 1. The nutrient solution should include all the essential amino acids and traces of the nonessential ones. In basal conditions the daily amount of water required is 25 to 35 ml/kg/day, and these needs increase in hypercatabolic states up to 50 to 70 ml/kg/day. Multiple factors modify water Recommended doses Nitrogen (g/kg/day) losses, such as high-protein diets, fever, polyuria, vomiting and kidney failure. Vitamins are essential for nutrition; they are involved in protein metabolism, in extracting energy from carbohydrates and fats, as well as in tissue synthesis. Their needs are not well established, although various investigations have determined their baseline values, which can increase three- to fivefold in hypercatabolic states. Vitamin requirements may be affected by changes in diet, use of some medications, diseases such as malnutrition, sepsis and trauma, and artificial nutrition, primarily parenteral nutrition. The deficit of the water-soluble vitamins occurs more easily because the fat-soluble vitamins are stored in the body and have a slower turnover (Table 20. Vitamin B12 should be taken 2 or 3 times a week and at very wide intervals thereafter. Fat-soluble vitamins should be administered once a week and vitamin K twice a week. These substances are involved in multiple cellular functions and various enzyme systems. Their needs in basal conditions are considered, and they are increased in hypercatabolic states (Table 20. When there are no solutions with trace elements, these can be provided by plasma transfusions given weekly or twice a week. Daily requirements Electrolite Sodium (Na+) Chlorus (Cl-) Kalium (K+) Calcium (Ca++) Phosphorus (P) - 1-2 mEq/kg 1-2 mEq/kg 0. Electrolytes and nutritional elements in which nutrients are not supplied by daily requirements. A primary form of treatment, artificial nutrition plays an important role in the comprehensive care of critically ill patients since a nutritional deficit can interact with the disease and prolong the healing process or have devastating consequences. The routes of administration are enteral nutrition and parenteral nutrition, discussed below. It is an optimal way to provide nutrients as it is more physiological, maintains the integrity of the intestinal mucosa, and has fewer complications. During the course of critical illness, the gut almost always remains inactive because of ileus or other frequent problems that prevent feeding and require nasogastric aspiration. Besides its role in the digestion and absorption of nutrients, the intestine also acts as an enteral flora barrier which prevents host invasion by microorganisms or their toxins. In patients who receive no food or nutrients in to the digestive tract, the intestinal mucosa become more permeable to the passage of germs and their products in to the bloodstream, leading to chronic hypermetabolism and multiple organ failure. Volumes of 200 to 400 ml 4 to 6 times a day can cause nausea, vomiting, diarrhea, cramps and bloating, with a high risk of aspiration. Intermittent administration is given in small amounts of 80 to 160 ml from 20 to 30 minutes every hour; however, tolerance is poor in some patients and the technique is impractical since it occupies a lot of nursing staff time. An alternative way for use in patients requiring prolonged enteral nutrition involves continuous administration of enteral solutions at a rate of 160 ml/hour for 12 hours. Isotonic solutions should be started at an infusion rate of 50 ml/ hour, and then gradually increased, as tolerated, up to 80 ml/hour. The concentration and volume of nutrients should not be modified simultaneously, but the required volume and concentration should be obtained within 24 to 48 hours. If intolerance develops, the volume or concentration of the diet should be reduced to the previous level of tolerance, and then increased after sufficient time for adaptation has elapsed. Wherever possible, regulators should be equipped with a flow or infusion pump to reduce the possibility of inadequate volumes, resulting in less bloating and diarrhea, lower residual volume and less risk of aspiration. The volume should be increased every 24 to 48 hours until it covers the total nutritional requirement with an intermittent bolus of 300 to 400 ml each, every 3 to 4 hours. The gastric residual should be controlled before each administration and administration discontinued if it is >150 ml. The patient should be rechecked after 2 hours and feeding can be restarted if the gastric residual is less than the stated value. This route of administration of nutrients may not be used in neurocritical patients because of the risk of aspiration. The tube should be placed distal to the Treitz ligament to decrease the risk of aspiration. The technique for tube placement may be blind (high failure rate) or by endoscopy, fluoroscopy or ultrasound-guided. The use of prokinetic agents facilitates, at least in theory, the passage of the pylorus, regardless of the technique. Also, these tubes can be positioned by invasive methods such as endoscopic percutaneous jejunostomy, radiological percutaneous jejunostomy and traditional surgery or by laparoscopy. Use of enteral nutrition, mainly jejunal nutrition, is suitable for early postoperative feeding, is safe and effective, as intestinal paralysis is predominant in the stomach and colon, and also it causes poor pancreatic stimulation. Bolus administration of hyperosmolar solutions in the small intestine can cause bloating, diarrhea and electrolyte disturbances. To avoid these adverse effects, volumetric pumps can be used and solutions with half of the desired concentration should be started at infusion rate of 50 ml/hour. If undesirable effects do not occur, then the gastrointestinal volume can be increased from 25 to 50 ml/hour every 24 hours until the daily volume is reached. The concentration of the solutions must be increased till the total osmolality of the nutritional formula is obtained. The most important limiting factor in intolerance to the diet is the osmolar load (intake per unit time) received by the digestive tract, so a gradual increase in the infusion rate, 410 Nutritional Support in Critically Ill Patients but not the concentration of the formula, is recommended, while maintaining a caloric density of 1 kcal/ml. Accordingly, protocols has been devised under which the quantity should be 20 ml/hour for the first 6 hours and then incremented by 10 ml/hour every 6 hours until the desired volume is reached, or to start with 20 ml/hour for 8 hours with increments of 20 ml/ hour every 8 hours until the infusion rate matches the requirements. If the patient develops diarrhea, and antidiarrhetic may be given, but if it persists or other adverse effects arise, feeding should be suspended for 48 hours. The presence of abdominal distention, diarrhea or other side effects have to be checked periodically. Homogenized diets are prepared with natural foods under technical homogenization; they differ from normal food only in consistency and method of administration through a catheter. These diets are prepared from milk, yogurt and ice cream, and other nutrients are added. Milk-based diets use milk as the main protein source and other sources of protein like eggs are added; calories are provided as lactose, dextrins, milk fat and soybean or corn oil. They are poorly tolerated in patients with disaccharidase deficiency and can cause diarrhea. Nonproteic calories are provided as oligosaccharides from glucose, dextrin and fat derived from soybean or corn oil. These diets are useful in patients with lactase deficiency, have low viscosity, and can be administered via small-calibre tubes. Nutritionally complete diets can be normal in protein, with a protein intake <20% of total calories, or high in protein, which contain 20% or more protein in relation to the supply of calories. Basic diets or formula-defined (monomeric or oligomeric) diets (also called chemically defined diets or peptides diets) are composed of nutrients that require minimal digestion, so they are easily absorbed by the duodenum and proximal jejunum. They consist of carbohydrates as oligosaccharides, sucrose and glucose, short-chain peptides (oligopeptides) or L-amino acids and medium-chain fatty acids, and small amounts of essential fatty acids and vegetable oils. These factors cause little gastric residue and small intestinal contents, which reduce the frequency of bowel movements and decrease colonic bacterial flora. Osmolality is high due to the low-molecular-weight nutrients; they are lactose-free and can be low in fat. They have a calorie density of 1 kcal/ml, reduce gastric acid secretion, but are expensive. They may be useful in patients with reduced inte411 Intensive Care in Neurology and Neurosurgery stinal absorption surface and in those with impaired digestion or absorption ability. They have high molecular density and may be useful in patients who require fluid restriction. Diets for special situations have been created to cover the nutritional needs in specific diseases. In addition, there are immuno-enriched diets with arginine or omega 3 fatty acids and diets enriched with glutamine which is involved in intestinal barrier integrity. Because of the vast variety of formulas for enteral nutrition, the diet composition and the proportion of different nutrients in the formulas should be reviewed before use. Mechanical Complications Mechanical complications are related to tube placement and maintenance, tube type and its anatomical position: They can be related to nasoenteral tubes; for example: · Misplacement of the tube in the pharynx, esophagus, airways and lungs increases the risk of aspiration. Intracranial insertion of the tube has been described in patients with skull fracture of the anterior fossa. These complications can be reduced with the use of flexible, small diameter tubes, changing the tube position and with the use of lubricants and topical decongestants. Also intestinal tract injuries can uoccur, such as: gastresophageal reflux, esophagitis, esophageal stricture, tracheesophageal fistula, rupture of esophageal varices, and mumps. Gastrostomy and jejunostomy include: technique-related complications, separation of the stomach or jejunum of the abdominal wall, surgical wound infections, cellulitis at the site of tube entry at the skin, abdominal wall abscess, necrotizing fasciitis, suture dehiscence and hernia, bleeding, gastric prolapse through the gastrostomy. Complications related to stroma care may cause skin irritation if there is extravasation of digestive juices.

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