R. Chris. Nichols College.
Cognitive efects of lamotrigine compared with lamotrigine in 56 children with intractable generalized epilepsy 3 ml lumigan overnight delivery. Dysgeusia in epileptic patients treated with lation in severe convulsive seizures purchase lumigan with paypal. Lamotrigine versus valproate monothera- seminated intravascular coagulation in children receiving lamotrigine and val- py-associated weight change in adolescents with epilepsy: results from a post proic acid discount lumigan 3ml amex. Acute hepatitis associated with lam- lepsy treated with sodium valproate or lamotrigine monotherapy. Epilepsia 2001; otrigine and managed with the molecular adsorbents recirculating system 42: 1002–1006. Fatal progressive hepatic necrosis as- valproate compared with lamotrigine for epilepsy. Drug-induced pseudolymphoma secondary to lamo- drugs on neuroactive steroids in men with epilepsy. Lamotrigine in idiopathic epilepsy: increased lepsy patients: a prospective evaluation of 103 children and adolescents. Idiosyncratic adverse reactions to antiepilep- of oral loading with lamotrigine in epilepsy monitoring units. Epilepsia2006;47: 1943– epidermal necrolysis during frst weeks of antiepileptic therapy: a case–control 1944. Population pharmacokinetics of lam- tivum multiforme majus, Stevens–Johnson syndrome, and toxic epidermal otrigine adjunctive therapy in adults with epilepsy. J Clin Pharmacol 1999; 39: necrolysis in Germany (1990–1992): structure and results of a population-based 373–384. Anticonvulsant hypersensitivity syndrome: in patients with epilepsy: retrospective analysis of routine monitoring data. Usual maintenance dosage is 1000–3000 mg/day Treatment may be started at 10–20 mg/kg/day and adjusted, according to response, by increments of 10–20 mg/kg/day every 2 weeks. The extended-release formulation is generally used once daily Signifcant drug Concomitant enzyme-inducing antiepileptic drugs decrease moderately the serum interactions concentration of levetiracetam Serum level Dosage can usually be adjusted on the basis of clinical response. Monitoring monitoring serum levetiracetam levels may be useful in selected cases Reference range 12–46 µg/mL (70–270 µmol/L) Common/important Somnolence, asthenia, dizziness, ataxia, infection, nervousness, irritability, adverse effects behavioural and psychiatric disorders Main advantages Relatively broad-spectrum activity, good tolerability and lack of clinically signifcant drug interactions Main disadvantages Efcacy in some generalized seizure types and epilepsy syndromes unproven. Minor oxidized metabolites account for about 3% of urinary recovery Volume of Adults: 0. Clearance can be lower in neonates but increases rapidly during the frst week of postnatal life. Levetiracetam is structure, pharmacological profle and mechanism of action, and also efective in genetic animal models that resemble human spike– as a consequence possesses unique properties. However, levetiracetam is the only one of these three drugs that delays acquisition of kin- dling at doses that are devoid of adverse efects . Chemistry Some experiments indicate a potential for the development of Levetiracetam is a white to of-white crystalline powder that tolerance in the amygdala kindled rat model, but no tolerance was is highly soluble in water (104. Of note, an experiment in chronically seizing rats chemical name is (–)(S)-α-ethyl-2-oxo-1-pyrrolidine-acetamide. Levetiracetam is a racemically pure pression of seizures in the frst 3 days, afer which seizures gradually S-enantiomer . The R-enantiomer has been shown to be devoid returned to baseline frequency, despite continuously elevated brain of anticonvulsant properties in animal models of seizures and ep- concentrations of the drug . Levetiracetam does not show protective activity in a vari- with control animals . Levetiracetam did not produce cognitive ety of maximal chemoconvulsive seizure models in mice, including impairment in the Morris water maze test in rats, whereas carba- seizures induced by the excitatory amino acids N-methyl-d-as- mazepine, valproic acid and clonazepam did . A 1500-mg discharging neurons  without afecting normal neuronal ex- intravenous infusion is bioequivalent to the oral formulation (three citability [16,17]. This appears to inhibit hypersynchronization of doses of 500-mg tablets) and steady-state conditions are achieved epileptiform activity . Binding afnity in rats was high in the in 48 h with twice daily intravenous dosing . Pharmacokinetic dentate gyrus, the superior colliculus, several thalamic nuclei, the modelling using adult intravenous and paediatric oral data indicate molecular layer of the cerebellum, and lower in the cerebral cortex, that a 15-min infusion should also be optimal for paediatric popu- the striatum and the hypothalamus . Approval of the intravenous use in children was grant- duced in the temporal neocortex  and hippocampus in tissue ed in the European Union on this basis, without formal paediatric from patients with epilepsy, compared to controls, and this efect trials. Levetiracetam also crosses the placenta, including the mouse audiogenic seizure model, the mouse corne- and fetal plasma levels approximate maternal levels. Conversion to minor oxidized metabolites ac- counts for about 3% of urinary recovery. In healthy adult volunteers, the apparent total body clearance of levetiracetam across studies is around 70 mL/min (1 mL/min/kg) Pharmacokinetics on average. The half-life of levetiracetam in adults is approximately Levetiracetam shows linear pharmacokinetics. However, because the mechanism of action is unclear, this ic profle of the drug has been studied in healthy adults, in adults, may not necessarily refect the functional half-life, and indeed there infants and children with epilepsy, in elderly subjects and in sub- is evidence from studies of the efect on the photoparoxysmal re- jects with renal and hepatic impairment. It Absorption was on this basis that a twice daily regimen was selected for clinical Levetiracetam is rapidly and virtually completely absorbed afer trials. Peak plasma concentrations Pharmacokinetics in special populations are reached in 0. Administration with food does not reduce the extent, but slows the rate of absorption . At a dosage of 1000 mg/day, the average steady-state as in neonates born to these women . At delivery, the concentration of Levetiracetam 519 levetiracetam in neonatal cord blood approximated maternal plas- tablet twice daily in those weighing 20–40 kg, and a 500-mg tablet ma concentration (mean ratio 1. As in adults, this dose could neonatal plasma concentrations declined to 20% of maternal lev- be adjusted based on the individual efcacy and tolerability within els within 36 h, despite the fact that most infants were breastfed. Concentrations of le- vetiracetam in breast milk were similar to maternal plasma concen- T e elderly trations, and no accumulation was found in the plasma of breastfed In a study based on therapeutic drug monitoring data, the appar- infants [33,34]. Plasma concentrations of levetiracetam in these ent oral clearance of levetiracetam was compared in the youngest infants were about 13% of those seen in the mothers. A marked (16–31 years; n = 151) and oldest (55–88 years; n = 157) quartile decline in plasma concentration of levetiracetam during pregnancy, of a population of 629 adult outpatients receiving levetiracetam followed by a rapid increase afer delivery, has been confrmed in therapy . In another dose ratio in the third trimester of pregnancy was only half of the study conducted in 16 hospitalized elderly patients, levetiracetam mean concentration–dose ratio at baseline.
It appears that antifibrinolytic effects of platelets pre- and platelet activating factor cheap lumigan on line. Tissue factor or thromboplastin activates extrinsic sys- platelet rich thrombus is known to resist thrombolysis cheap 3ml lumigan fast delivery. Platelet activating factor induces aggregation of plate- by estimating the platelet retention in the tube buy 3ml lumigan with mastercard. Another vascular factor promoting hemostasis is vaso- anticoagulant, clotted blood retracts and 50% retrac- constriction of small vessels following injury. Subendothelial collagen promotes platelet adhesion completes at the end of 18 to 24 hours. Platelet count: Decreased platelet count is associated with prolongation of bleeding time. Platelet count is not routinely ordered in which usually occurs due to formation of antibody against clinical practice. Antiplatelet antibodies get attached to platelet hemostatic mechanisms, especially in the diagnosis of membrane glycoproteins, and these platelets are phagocy- a bleeding disorder, platelet count is a must. It is prolonged in severe and occurs equally in both genders that usually thrombocytopenia and thrombasthenia. Thecommon featureof the disease isbleedingthat usu- gate is assessed with the help of aggregometer. Skin is the commonest site test, an aggregating agent is added to a suspension of platelets in plasma and the response is measured of hemorrhage, exhibiting petechiae or ecchymoses. Diagnosis is made by demonstrating thrombocytope- blood is allowed to pass at a constant rate through a nia, anemia, and anti-platelet antibodies in the patient. Note that platelets having antiplatelet antibodies on their surface are destroyed in spleen. The treatment consists of administration of corticos- cytopenia (platelet count less than 50,000/cu mm of teroids, and splenectomy. Thrombocytopenia in Pregnancy Neonatal Autoimmune Thrombocytopenia Thrombocytopenia is common during pregnancy and usu- Sometimes, neonatal autoimmune thrombocytopenia ally asymptomatic. A form, called as gestational thrombocytopenia that 50,000/cu mm of blood in this condition. It may be asso- occurs during late gestation (count may be less than ciated with autoimmune hemolytic anemia. Antibodies 70,000/cu mm of blood in last trimester) and resolves are demonstrated against platelet specific alloantigens. Though platelets are small in size, they have highly developed membrane and cellular cytoskeletal system, open canalicular system, alpha and dense granules, and membrane glycoproteins. All these cellular specializations help in platelet functions: adhesion, aggregation, activation, and secretion. Primary hemostasis (temporary hemostatic plug formation) is the first and important step in hemostasis, which mainly depends on platelets. Platelet also paly role in clotting by activating few clotting factors and promoting clot retraction. Platelet count less than 50,000 per cu mm of blood is called critical count, as bleeding is significant below this count. In theory examination, “Role of platelets in hemostasis”, “Steps and regulation of thrombopoiesis”, and “Structure, properties and functions of platelets” may come as Long Questions. Temporary hemostatic plug, properties of platelets, thrombopoiesis, platelet granules, cytoskeletal and canalicular systems of platelets, functions of platelets, and platelet function tests may come as Short Questions in exams. Appreciate the physiological basis of use of fibrinolytic agents in coronary artery disease and stroke. List the investigations for detection of defects in temporary and definitive hemostatic plug formation. Later, few more were Coagulation of blood is a vital physiological process, as added to the list. Blood is maintained in a Scientist contributed fluid state in the vascular compartment, yet swiftly coagu- lates to seal a vascular injury. Failure to form clot results in In 1905, Paul Morawitz was the first scientist who systematically assembled coagulation factors into hemorrhage or thromboembolic phenomenon. Paul Morawitz hemostasis is the coagulation of blood, the process which is simultaneously activated along with the activation of Factor I platelets. It is a dimeric glycoprotein with molecular weight of present in their inactive form in plasma. The genes for three chains of fibrinogen are found in reactions involving clotting factors. It is an important physiological initiator of extrinsic pathway for blood coagulation. Fibrinogen is present in plasma and α-granules of vasation of blood from the injured vessel, circulating platelet. Fibrin forms the structural meshwork that transforms steps of intrinsic and extrinsic pathways of blood coagula- the loose platelet plug into a solid hemostatic plug. This is a large glycoprotein with molecular weight 333,000 and plasma half-life of about 12h. It is a single chain zymogen with molecular weight thrombin to thrombin, though it also participates in 72,000 and plasma half-life of about 60 h. The gene for human prothrombin is located on chro- glutamic acid residues that are important in activating mosome 11 close to the centromere. This activity is physiologically expressed on the surface of Oscar D Ratnoff and Joan E Colopy worked in the field of blood coagulation. It possesses receptor contains 731 amino acids with molecular weight of mediated proinflammatory activity. The gene for thrombomodulin is located on chromo- platelets, monocytes and macrophages. When thrombin binds with thrombomodulin, the the gene for B chain is located on chromosome 1. Thrombin causes cleavage of A and B subunits of in turn, causes 2000-fold activation of protein C. In addition to its nonenzymatic function in contact Protein S activation, it acts as a thiol protease inhibitor. It is cleaved by prekallikrein to bradykinin, a potent Protein S is a single-chain glycoprotein cofactor synthe- vasodilator.
Particularly for male patients buy lumigan 3ml with mastercard, it is helpful to keep the patient undergoes no speciﬁc preparation other than per- them in the recovery area until they have demonstrated the haps some enemas to clear the rectum buy lumigan 3 ml fast delivery, and does not need ability to void as urinary retention can occur cheap lumigan 3 ml on-line. Many surgeons, however, prefer to Modiﬁcations of the dermal ﬂap include the V-Y ﬂap perform the procedure with the addition of bowel prepara- and the “house” ﬂap (Fig. A general or regional cedure, the internal opening is excised and the ﬂap advanced anesthetic is induced, and the patient is positioned in prone into the anal canal. Proper positioning is crucial, with the the open area in the perianal skin resulting from advance- patient’s hips on a hip roll at the break in the bed and the bed ment of the ﬂap is able to be closed due to the geometry of in maximum ﬂexion. After the patient is prepped and draped, an elliptical inci- Results sion is made incorporating the internal opening of the ﬁstula (Fig. The ellipse is slightly more narrow at the Healing of Fistula end with the internal opening of the ﬁstula than at the distal end. The ellipse can also incorporate the external opening of Dermal ﬂap has a good success rate for healing anal ﬁstulas, the ﬁstula, so that the ﬁstula tract remains beneath the skin with most healing rates reported to be in the 70–80 % range being used for the ﬂap. In fact, the healing rate may be even greater including a small portion of the internal sphincter surrounding than this, as many of the studies demonstrating lower success rates had small numbers of patients. In the three largest studies, each including at least 40 patients and together comprising C. Jensen quite high, particularly if it is performed by surgeons who use dermal ﬂaps frequently to treat anal ﬁstula. Because of the amount of dissection required, the wounds from dermal ﬂap repair may take several weeks to heal. Overall, it appears most operative sites will heal in approxi- mately 6 weeks [3 , 7 – 9]. However, average healing times of as little as 2–3 weeks , or as long as 3 months , have been reported. Patients should therefore be counseled that it may be several weeks before complete healing is achieved. The observed recurrence rate may depend partially on the duration for which the patient is followed. Among ten women with anovaginal ﬁstulas associated with Crohn’s disease and repaired with dermal ﬂaps, Hesterberg et al. Thus, success rates may vary depending on the length of follow-up, as recurrences can occur even more than 1 year after operation. The most commonly reported complication is minor separation of the external portion of the ﬂap. Reported rates of this complication range from 5 %  to 50 % , with other reports falling between these two extremes [1, 8 ]. However, if the dermal ﬂap is performed in the manner described earlier in this chapter, leaving a portion of the wound in the perianal skin open, this complication is rare. It seems this complication is more likely to occur when the skin is completely closed, as with a V-Y or house ﬂap, likely due to excessive tension on the wound. Other reported complications include persistent external ﬁs- tula tract after healing of the internal opening  and infec- tious complications (Clostridium difﬁcile infection, urinary tract infection, cellulitis) . In a randomized controlled trial, Ho and Ho found no difference in complication rates or postoperative pain between dermal ﬂaps and ﬁstulotomy or seton placement, although this study only included 20 patients . Thus, dermal ﬂap is associated with a low rate of complications, particularly if a portion of the external wound is left open to prevent dehiscence of the wound. This was found by both Ellis and Clark also reported a higher recurrence rate with Zimmerman et al. Although type of ﬁstula so it is unclear whether this association would hold if only seems as if it would affect healing rates, this has not been dermal ﬂaps were examined. Three of the 16 patients in this study had deterioration in continence, Although dermal ﬂap does not involve division of anal which was a decrease in control over ﬂatus. However, all sphincter musculature, it may still be associated with a dec- three also reported a decrease in soiling. This may be due to stretching of the patients reported increased urgency and the need to continue sphincter muscles by the retractor during operation, which pad use as a result. Of note, the authors mention that some of would potentially have only a temporary effect on conti- the patients had a decrease in the ability to control ﬂatus in the nence. Advancement of the dermal ﬂap into the anal canal immediate postoperative period but ultimately reported could also affect closure of the anus, preventing tight sealing improved continence. Twenty-two percent nal opening closure, and dermal ﬂap in healing of horseshoe had improvement in continence, but 30 % had a deteriora- ﬁstulas . Of 11 patients with perfect continence preoperatively, nal ﬁstulas associated with Crohn’s disease, Penninckx et al. Perhaps some of the high prevalence of included patients with dermal advancement ﬂap. In contrast, deterioration in continence may be due to the presence of Athanasiadis et al. If these attempts involved divi- However, all of these studies include relatively small numbers sion of part of the anal sphincters, the addition of the dermal of patients undergoing each surgery, so their ability to detect a ﬂap may have been enough to make the incontinence clini- difference in success rates between methods is questionable. Thus, the effect of dermal ﬂap on continence may vary signiﬁcantly between patients, and patients should be cautioned as to the potential for increased symptoms of Special Situations incontinence as a risk associated with dermal ﬂap. Crohn’s Disease Manometric Results Dermal ﬂap may be ideally suited to patients with Crohn’s disease. Provided there is not extensive perianal disease with Only one study has examined manometric results after der- scarring from prior ﬁstulas, dermal ﬂap can bring unaffected mal advancement ﬂap. Many dorsal horseshoe cryptoglandular ﬁstulas with one of four patients with Crohn’s disease may also have anal stenosis, methods of closing the internal opening: mucosal ﬂap, partial- and dermal ﬂap can be used to treat both problems at one or full-thickness endorectal advancement ﬂap, dermal ﬂap, operation. Unfortunately, there are few reports of the use of or direct (suture) closure . They reported new incontinence in Nelson’s report of 65 patients treated with dermal ﬂap, of 12 patients, but it is not possible to determine from the data which 17 had Crohn’s disease and successful healing was presented how many of these were within the group treated achieved in 15 . Mean resting pressures decreased from ing in three of six patients with Crohn’s, but pursued a very 137 cm H2O preoperatively to 101 cm H O 2 postoperatively conservative regimen in these patients including either proxi- among patients who had a dermal ﬂap, and mean squeeze mal diversion or total parenteral nutrition for 6 weeks after pressures from 297 to 229 cm H2O. Among the 11 patients treated with dermal ﬂap by to be better than another in terms of the change in resting and Del Pino et al.
Over 70% of glomerulonephritis patients have glomerular deposits of immunoglobulins purchase 3ml lumigan overnight delivery, frequently with complement components order genuine lumigan online. Antibody-associated injury may result from the deposition of soluble circulating antigen–antibody com- plexes in the glomerulus or by antibodies reacting in the glomerulus either with antigens intrinsic to the glomerulus Figure 17 order lumigan 3ml free shipping. Goodpasture syndrome is an example of a disease in which antibodies complexes become lodged in the microvasculature such as the react directly with the glomerular basement membrane, renal glomeruli. They may activate the complement system and interrupting its integrity and permitting red blood cells to attract polymorphonuclear neutrophils, initiating an infamma- pass into the urine. Diphtheria antitoxin prepared in horses induced branoproliferative glomerulonephritis type I, IgG and C3 serum sickness when the foreign horse serum proteins stimu- are found deposited in the glomerulus, whereas in dense lated antibodies in human recipients. Immunological Diseases and Immunopathology 561 in their serum, which facilitates stabilization of alternate C3 convertase, thereby promoting C3 degradation and hypo- complementemia. Entactin and nidogen are glomerular basement membrane antigens that might have a possible role in glomerular base- ment membrane nephritis. Entactin is a 150-kDa glomerular membrane sulfated glycoprotein that is probably synthesized by endothelial and epithelial cells in the developing kidney. Nidogen, also a basement membrane constitutent, is a 150-kDa glycoprotein that has binding affnity for laminin. Serum IgG, IgM, and/or IgA antibodies specifc for entactin/nidogen have been found in over 40% of patients with glomerulonephritis a sequela of certain infections, e. The subepithe- Immunotactoid glomerulopathy is a renal malady charac- lial immune deposits are shown by immunofuorescence to terized by glomerular deposits of fbrillar material comprised contain both immunoglobulins and complement. A total of 10 to not birefringent when stained with Congo red and examined 30% of cases have a less severe course. Conventional light microscopy of the kidney with a good prognosis for most patients, which reveals splitting of basement membranes. The subject pres- membrane’s lamina densa appears as an electron-dense rib- ents with hematuria, fever, general malaise, facial swelling, bon on either side of which C3 can be detected by immu- and smokey urine. Renal biopsy reveals infltration of glom- eruli by polymorphonuclear leukocytes and monocytes and a diffuse proliferative process. Immunofuorescence shows granular deposits of IgG and C3 on the epithelial side of peripheral capillary loops. Immune complex glomerulonephritis is infammation induced by antigen-antibody complexes deposited in the Figure 17. This occurs following autoanti- cleared from circulation (minutes), in contrast to the turn- body reaction with tubular basement membrane in the kid- over of α2M which requires several days. It is elevated signifcantly casts in the urine, oliguria, azotemia, and hypertension. Nephrotic syndrome is a clinical complex that consists of massive proteinuria with the loss of greater than 3. Nephrotic syn- gressive glomerulonephritis, in which C3 is deposited in the drome in children often follows lipoid nephrosis, whereas in glomerular basement membrane of the kidney. The disease is induced by the injection of rabbit lipocalin family and possesses hydrophobic prosthetic anti-rat glomerular basement membrane antibody into rats. It is synthesized in the liver and is present in the the antiserum for passive transfer is raised in rabbits immu- urine and serum. Masugi nephritis is an experimental model of Goodpasture syndrome α2 macroglobulin (α2M) is a 725-kDa plasma glycopro- in man. Immunological Diseases and Immunopathology 563 Coated pit Clathrin Anti-gp330 IgG gp330 Figure 17. These immune deposits stain positively for immunizing rats with proximal tubule brush border prepara- IgG and complement by immunofuorescence. Affected chil- tions containing subepithelial antigen or Heymann factor, a dren develop fever, nausea, oliguria, and hematuria within 330-kDa protein incorporated in Freund’s adjuvant. The rats 2 weeks following a streptococcal sore throat or skin infec- produce antibodies against brush border antigens, and mem- tion. Erythrocyte casts and mild proteinuria may be identi- branous glomerulonephritis is induced. There may be periorbital edema and hypertension upon bine with shed epithelial cell antigen. Immunoglobulins and idly progressive glomerulonephritis and a few others develop complement are deposited in a granular rather than linear pat- chronic glomerulonephritis. They may also occur in selected other nonstreptococcal postinfectious Heymann’s nephritis: See Heymann glomerulonephritis. Poststreptococcal glomerulonephritis is an acute prolif- IgA nephropathy (Berger’s disease) (Figure 17. It is usually seen in 6- to 10-year-old children, but it may occur in adults as well. A total of 90% of patients have been infected with Group A β hemolytic streptococci that are nephritogenic, specif- cally types 12, 4, and 1 which are revealed by their cell wall M protein. Poststreptococcal glomerulonephritis is mediated by antibodies induced by the streptococcal infection. Immunofuorescence of renal biopsies demonstrates granular immune deposits that Subepithelial deposits contain immunoglobulin and complement in the glomer- uli. The precise streptococcal antigen has never been identifed; however, a cytoplasmic antigen termed endostreptosin together with Humps some cationic streptococcal antigens are found in glomeruli. Patients usually present with gross or Approximately one-third of cases are linked to diabetes microscopic hematuria and often mild proteinuria. There may also be venous onstrating IgA and C3, fxed by the alternative pathway, is thrombosis. Electron microscopy confrms the presence of electron-dense deposits in mesangial areas. Berger’s disease is a type of glomerulonephritis in which C3 is decreased in the serum as a consequence of alternate prominent IgA-containing immune deposits are present complement pathway activation. Patients usually present with gross or increase in sialic acid-rich glomerular basement membrane microscopic hematuria and often mild proteinuria. Patients may possess a serum factor termed microscopy, mesangial widening or proliferation may be nephritic factor that activates the alternate complement path- observed. This factor is an immunoglobulin molecule that reacts onstrating IgA and C3, fxed by the alternative pathway, is with alternate complement pathway-activated components required for diagnosis. Electron microscopy confrms the such as the bimolecular C3b and activated factor B complex.