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Surgery. Dofetilide doses were 4 or 8 kg. Conversion within 3 hours was observed in 44% of the high-dose group, 36% of the low-dose group, and 24% of the placebo group. These differences were not statistically significant. Two large randomized clinical trials in patients with persistent atrial fibrillation provided the major efficacy data that led to the preliminary approval of dofetilide in the United States. In the Symptomatic Atrial Fibrillation Investigative Research on Dofetilide SAFIRE-D ; trial, 44 325 patients with persistent atrial fibrillation were hospitalized and randomized to therapy with either placebo or dofetilide at 1 of doses: 125 g BID, 250 g BID, and 500 g BID. After initial assignment to a dosage group, the actual dose could then be adjusted on the basis of estimated creatinine clearance. Patients with a creatinine clearance 60 mL min received the assigned dose, whereas patients with a creatinine clearance between 40 and 60 mL min received one-half the assigned dose. Patients were monitored continuously during the initiation phase, and if they were still in atrial fibrillation after 5 doses of study drug, they underwent DC cardioversion. Patients who converted to and maintained sinus rhythm for 24 hours then entered a maintenance phase. Dofetilide dosage could be adjusted downward if the QT or QTc interval increased by 15% to 25% over baseline. If at any time during the study the QT or QTc had increased by 25% or exceeded 550 ms, dofetilide was discontinued. Repeat cardioversions on therapy were not permitted. The primary end point of the study was the proportion of patients remaining in sinus rhythm on therapy at 6 months. During the initial phase, pharmacological cardioversion occurred in 1.2%, 6.1%, 9.8%, and 29.9% of patients in the placebo, 125 g BID, 250 g BID, and 500 g BID groups, respectively. After pharmacological or electrical conversion, 250 of 350 patients, between 73% and 81% from each group, went on to maintenance therapy. An intention-to-treat analysis for all patients showed the dofetilide 500 g BID dose superior to placebo, with 50% and 47% of patients in that group still in sinus rhythm at 6 and 12 months, respectively, compared with 30% and 20% of placebo-treated patients at the same time points P 0.05 and P 0.008 ; . The lower dofetilide dose groups showed less marked effects that did not reach statistical significance. If one includes only patients who entered the maintenance phase, the 500 g BID dose group was again superior to placebo after both 6 and 12 months 62% and 58% in sinus rhythm on dofetilide versus 37% and 25% in sinus rhythm on placebo ; . The lower doses of dofetilide did not show a statistically significant difference from placebo. The European and Australian Multicenter Evaluative Research on Atrial Fibrillation Dofetilide EMERALD ; study44 was a randomized, double-blind, placebo-controlled trial in patients with persistent atrial fibrillation. As in SAFIRE-D, there was both a conversion phase and a maintenance phase. Patients were randomized to receive either placebo, 1 of 3 doses of dofetilide 125, 250, or 500 g BID ; , or sotalol 80 mg BID. Downward dosage adjustment was allowed, based on estimated creatinine clearance with a single daily dosage of the original amount used rather than twice-daily dosage for patients with a creatinine clearance between 40 and 60 mL min. Patients with a creatinine clearance 40 mL min.
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ACTIVITY OF VASOMOTOR CENTERS least prior to the syncope, while it is well known that the faint is preceded by pallor. It may be, however, that the local action of the epinephrine on the skin vessels more than compensates for loss of vasomotor activity. Overventilation, which likewise reduces vasomotor activity, also causes skin pallor and therefore may not produce a fall of arterial blood pressure see McDowall21 ; . REFERENCES R. J. S.: The innervated perfused leg. J. Physiol. 88: 21, 1933. HEMINGWAY, A.: The sensitising action of alkalis. J. Physiol. 62: SI, 1926.
QT Prolongation and Ventricular Arrhythmias QT interval prolongation has been a consistent finding in studies which evaluated electrocardiographic changes with oral or parenteral quinine administration, regardless of age, clinical status, or severity of disease. The maximum increase in QT interval has been shown to correspond with peak quinine plasma concentration See CLINICAL PHARMACOLOGY Electrocardiogram ; . Quinine sulfate has been rarely associated with potentially fatal cardiac arrhythmias, including torsades de pointes, and ventricular fibrillation. Quinine sulfate is not recommended for use with other drugs known to cause QT prolongation, including Class IA antiarrhythmic agents e.g., quinidine, procainamide, disopyramide ; , and Class III antiarrhythmic agents e.g., amiodarone, sotalol, dofetilide ; . Quinine may also inhibit the metabolism of other drugs that are CYP3A4 substrates known to cause QT prolongation, such as astemizole, cisapride, terfenadine, pimozide, halofa ntrine and quinidine. Torsades de pointes has been reported in patients who received concomitant quinine and astemizole. Therefore, concurrent use of quinine sulfate with these medications, or drugs with similar properties, should be avoided See PRECAUTIONS Drug Interactions ; . Concomitant administration of quinine sulfate with the antimalarial drugs, mefloquine or halofantrine, may result in electrocardiographic abnormalities, including QT prolongation, and increase the risk for torsades de pointes or other serious ventricular arrhythmias. Concurrent use of quinine sulfate and mefloquine may also increase the risk of seizures See PRECAUTIONS Drug Interactions ; . The use of macrolide antibiotics such as erythromycin should be avoided in patients receiving quinine sulfate. Fatal torsades de pointes was reported in an elderly patient who received concomitant quinine, erythromycin, and dopamine. Although a causal relationship between a specific drug and the arrhythmia was not established in this case, erythromycin is a CYP3A4 inhibitor and could potentially increase quinine plasma levels when used concomitantly. A related macrolide antibiotic, troleandomycin, has been shown to increase quinine exposure in a pharmacokinetic study See PRECAUTIONS Drug Interactions ; . Quinine sulfate should also be avoided in patients with known prolongation of QT interval See CONTRAINDICATIONS ; , in elderly patients, and in patients with clinical conditions known to prolong the QT interval, such as uncorrected hypokalemia, bradycardia, and certain cardiac conditions. Concomitant Use of Rifampin Treatment failures may result from the concurrent use of rifampin with quinine sulfate, due to decreased plasma concentrations of quinine, and concomitant use of these medications should be avoided See PRECAUTIONS Drug Interactions.
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TABLE 3. Ophthalmological evaluation at end of triala, b!
All animals in this study received humane care in compliance with the guide for the care and use of laboratory animals national institutes of health, 1996.
Dr samniah is supported in part by a grant from the midwest arrhythmia research foundation and dok.
To test the model prediction of a preferential APD prolongation by ERG blockade in areas of high ERG expression Fig. 2B, Dofetilide ; , the effects of dofetilide on the local QTc and ARIc were measured in the heart in vivo. Dofetilide increased mean QTc from 311 by 34 ms 106% ; and mean ARIc from 243 by 31 ms 127% ; . The QT prolongation was significantly greater in areas of short basal QTc and smaller in areas of long basal QTc Fig. 4A ; . In consequence, when correlating the increase in local QTc to its basal value in each heart n 9 ; , the average slope was -0.680.17 at an average r2 of 0.32. When allocating the basal values of each heart to 9 percentile classes and calculating the dofetilide-induced increase, there was a significantly greater increase in the two lowest and a much smaller increase in the two highest QTc classes compared to the overall mean Fig. 4A ; . In fact, in three hearts in areas of long basal QTc dofetilide induced hardly any rise in QTc 3% ; . When relating the dofetilide-induced rise in local ARIc to basal ARIc, the data were.
ABSTRACT Cell swelling has b e e shown to cause activation o f a variety o f cardiac sarcolemmal ionic c o n potassium channels. T h e aim o f this study was to investigate the effect o f swelling on the two subtypes o f delayed rectifier potassium c u r single g u i pig myocytes using the whole-cell configuration o f the patch c l a technique. W h e the h o l tial was set at - 4 0 for 1 s u isoosmotic conditions 300 m O s delayed rectifier c u r was activated 0.86 - + 0.05 nA; n 43 ; . Switching to a hypoosmotic solution 200 m O s caused a r a increase in IK to value o f 1.43 - 0.10 nA p 0.05; n 43 ; . T effect o f swelling on the two subtypes o f IK was s t u analysis o f deactivating tail currents using an envelope o f tails p r o stepping from - 4 0 to for 18 different pulse d u r between 50 ms a 2.9 s; n 16 ; . Swelling caused a decrease in c u the e n d the pulse and I ~ u ; short d u r 150 ms ; however, when the pulse d u r was 1 s swelling caused a significant increase in current. Using a pulse p r o with m i n contamination by I~ voltage step from - 4 0 to - for 250 ms ; a 50-100 p A c u was elicited which c o u dofetilide 0.2 ~M; n -- 3 ; . Introd u c t solution caused a significant decrease in Iw a when dofetilide 0.2 o r 1.0 I~M ; was i n t the c u r was d e c 0.05; n 5 ; , b u was n o t completely blocked, thus suggesting that swelling h a d the ability o f dofetilide to block I~. Similar results were o b t over a range o f dofetilide c o n with a s e blocker, La 3 + . Ca2 + -free e x t e solutions, pulsing to - 1 0 for 500 ms to m the absence o f L , for 5 s with 0.2 ~M dofetilide ; to evoke only I~, it was clear that swelling significandy i n c Ii~ pulse a n d tail currents ; a n d Iw. In addition, when m e a using the p e r patch and dolasetron.
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2000 and Chinese hamster ovary CHO-hkor ; cells transfected with the human -receptor were cultured under a 5% CO2 atmosphere in Dulbecco's modified Eagle's medium C6 cells ; or Dulbecco's modified Eagle's medium F-12 CHO cells ; supplemented with 10% fetal calf serum. For subculture, one flask from each passage was grown in the presence of 1 mg ml geneticin. Cells used for experiments were grown in either the absence C6 cells ; or presence CHO cells ; of 1 mg ml geneticin. This did not change the level of receptors. Once cells had reached confluency, they were harvested in HEPES 20 mM, pH 7.4 ; -buffered saline containing 1 mM EDTA, dispersed by agitation, and collected by centrifugation at 1600 rpm. The cell pellet was suspended in 50 mM Tris-HCl buffer, pH 7.4, separated into aliquots 0.751.0 mg protein ; , and frozen at 80C. Ligand Binding Assay. Brains from CSI mice were homogenized in Tris-HCl buffer pH 7.4, 50 mM ; using a Polytron at setting 7. After centrifugation at 25, 000g for 15 min, the pellet was resuspended in 10 volumes of buffer and incubated at 37C for 30 min to remove endogenous opioid ligands. The homogenates were then recentrifuged, and the pellets were resuspended in Tris-HCl buffer at a final protein concentration of 500 g ml Lowry et al., 1951 ; . Membrane protein approximately 450 g ; was incubated in TrisHCl pH 7.4 ; with varying concentrations of BU48 and 1 nM [3H][DAla2, N-Me-Phe4, Gly5-ol]-enkephalin DAMGO ; , 2 nM [3H][D-Pen2, DPen5]-enkephalin DPDPE ; , or 0.5 nM [3H]CI977 in a final volume of 1 ml. After 1 h at 25C, the mixture was rapidly vacuum-filtered through GF B filters to separate bound from free ligand, and the filters were rinsed three times with 3 ml of ice-cold buffer Tris-HCl, pH 7.4 ; . Radioactivity retained on the filters was determined by liquid scintillation counting. Nonspecific binding was typically 80% of total binding at the radioligand affinity Kd ; . Competition data were analyzed by nonlinear curve fitting GraphPad, San Diego, CA ; to give IC50 values that were converted to affinity Ki ; values using the Cheng and Prusoff 1973 ; equation. [35S]GTP S Binding Assay. Freshly prepared membranes 30 50 g protein for C6 , 40 50 protein for C6 , or 1520 g of protein for CHO-hkor ; were incubated in GTP S binding buffer 20 mM HEPES, pH 7.4, 100 mM NaCl, and 10 mM MgCl2 6H2O ; containing [35S]GTP S 0.1 nM ; , GDP 30 M ; , and varying concentrations of test compound to a final volume of 1 ml for 60 min at 30C as previously described Traynor and Nahorski, 1995 ; . Bound and free [35S]GTP S were separated by vacuum filtration through GF C glass-fiber filters mounted in a Brandell 24-well harvester. The filters were subsequently washed three times with ice-cold GTP S binding buffer, and the radioactivity was determined by liquid scintillation counting. The EC50 values for stimulation of [35S]GTP S binding obtained at various drug concentrations were determined from nonlinear curve fitting of the data Prism; GraphPad Software.
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Other considerations a. Severe coagulopathies - draw baseline PT, PTT, fibrinogen levels, for lab evaluation see below Hepatic failure Intestinal infarction - Due to retained pill fragment or hypotensive episode and doral.
A similar conversion rate was achieved after 3 days in emerald with dofetilide 500microg twice daily 29% ; which was significantly greater than that achieved with sotalol 80mg twice daily 6%; p 05.
CLASS I DRUGS: SODIUM CHANNEL BLOCKERS Class IA Quinidine Cardioquin, Quinidex, Quinaglute ; Procainamide Pronestyl, Procan SR ; Disopyramide Norpace, Norpace CR ; Moricizine Ethmozine ; Class IA drugs decrease the flow of sodium into the cell and prolong the action potential. This decreases automaticity, slows the rate of impulse conduction, and prolongs refractoriness. They are used to treat both supraventricular and ventricular tachycardias. Class IB Lidocaine Xylocaine ; Tocainide Tonocard ; Mexiletine Mexitil ; Phenytoin Dilantin ; Class IB, or lidocaine-like, drugs decrease the refractory period but have little effect on automaticity. Drugs in this class are used primarily to treat ventricular dysrhythmias, including PVCs and ventricular tachycardia. Class IC Flecainide Tambocor ; Propafenone Rythmol ; Class IC drugs slow impulse conduction velocity but have little effect on refractoriness. They are used to reduce or eliminate tachydysrhythmias associated with reentry. Their significant prodysrhythmic effects limit their usefulness, but they may be used to treat supraventricular tachycardia. CLASS II DRUGS: BETA-BLOCKERS Esmolol Brevibloc ; Propranolol Inderal ; Metoprolol Toprol ; Class II drugs are beta blockers that decrease automaticity and conduction through the AV node. They also reduce the heart rate and myocardial contractility. They are used to treat supraventricular tachycardia and to slow the ventricular response rate to atrial fibrillation. These drugs may cause bronchospasm and are contraindicated for clients with asthma, chronic obstructive pulmonary disease COPD ; , or other restrictive or obstructive lung diseases. CLASS III DRUGS: POTASSIUM CHANNEL BLOCKERS Sotalol Betapace ; Bretylium Bretylol ; Amiodarone Cordarone ; Ibutilide Corvert ; Dofetilide Tikosyn ; Class III drugs block potassium channels, prolonging repolarization and the refractory period. Drugs in this class are used primarily to treat ventricular tachycardia and ventricular fibrillation. Amiodarone may also be used for supraventricular tachycardias and dovonex.
Shipyard workers. Am. J. ind. Med., 1, 191-203 46. Alies-Patin, A.M. & Valleron, A.J. 1985 ; Mortality of workers in a French asbestos cement factory 1940-82. Br. J. ind. Med., 42, 219-225 47. Berry, G., Newhouse, M.L. & Antonis, P. 1985 ; Combined effect of asbestos and smoking on mortality from lung cancer and mesothelioma in factory workers. Br. J. ind. Med., 42, 12-18 48. Hodgson, J.T. & Jones, R.D. 1986 ; Mortality of asbestos workers in England and Wales. Br. J. ind. Med., 43, 158-164 49. Coggon, D., Pannett, B. & Acheson, E.D. 1984 ; Use of job-exposure matrix in an occupational analysis of lung and bladder cancers on the basis of death certificates. J. natl Cancer Inst., 72, 6165 50. Kjuus, H., Skjaerven, R., Langard, S., Lien, J.T. & Aamodt, T. 1986 ; A case-referent study of lung cancer, occupational exposures and smoking. II. Role of asbestos exposure. Scand. J. Work Environ. Health, 12, 203-209 51. Newhouse, M.L., Berry, G. & Wagner, J.C. 1985 ; Mortality of factory workers in East London 1933-80. Br. J. ind. Med., 42, 4-11 52. Hilt, B., Langard, S., Andersen, A. & Rosenberg, J. 1985 ; Asbestos exposure, smoking habits, and cancer incidence among production and maintenance workers in an electrochemical plant. Am. J. ind. Med., 8, 565-577 53. Woitowitz, H.-J., Lange, H.-J., Beierl, L., Rathgeb, M., Schmidt, K., Ulm, K., Giesen, T., Woitowitz, R.H., Pache, L. & Rdelsperger, K. 1986 ; Mortality rates in the Federal Republic of Germany following previous occupational exposure to asbestos dust. Int. Arch. occup. environ. Health, 57, 161-171 54. Zoloth, S. & Michaels, D. 1985 ; Asbestos disease in sheet metal workers: the results of a proportional mortality analysis. Am. J. ind. Med., 7, 315-321 55. Elmes, P.C. & Simpson, M.J.C. 1977 ; Insulation workers in Belfast. A further study of mortality due to asbestos exposure 1940-75 ; . Br. J. ind. Med., 34, 174-180 56. Huuskonen, M.S. 1980 ; Asbestos and cancer in Finland. J. Toxicol. environ. Health, 6, 12611265 57. Selikoff, I.J. & Seidman, H. 1981 ; Cancer of the pancreas among asbestos insulation workers. Cancer, 47 Suppl. ; , 1469-1473 58. Burch, J.D., Howe, G.R., Miller, A.B. & Semenciw, R. 1981 ; Tobacco, alcohol, asbestos, and nickel in the etiology of cancer of the larynx: a case-control study. J. natl Cancer Inst., 67, 12191224 59. von Bittersohl, G. 1977 ; On the problem of asbestos-induced carcinoma of the larynx Ger. ; . Z. ges. Hyg., 23, 27-30 60. Rubino, G.F., Piolatto, G., Newhouse, M.L., Scansetti, G., Aresini, G.A. & Murray, R. 1979 ; Mortality of chrysotile asbestos workers at the Balangero mine, Northern Italy. Br. J. ind. Med., 36, 187-194 61. Musk, A.W., de Klerk, N., Hobbs, M.S.T. & Armstrong, B.K. 1986 ; Mortality in crocidolite miners and millers from Wittenoom, Western Australia Abstract ; . Am. Rev. respir. Dis., 133 Suppl. 4.
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Experiments, PAs of 1.5- to 0.15-mm diameter were microdissected free of surrounding tissue and adventitia for fluorescent assays or for isolation of endothelial or vascular smooth muscle cells and doxil.
Do not use hydrochlorothiazide moexipril if: you are allergic to any ingredient in hydrochlorothiazide moexipril or any other sulfonamide medicine eg, sulfamethoxazole, glyburide, probenecid ; you have a history of angioedema swelling of the face, lips, throat, or tongue ; or kidney artery narrowing, or you are unable to urinate you are taking dofetilide or ketanserin you are in your second or third trimester of pregnancy contact your doctor or health care provider right away if any of these apply to you.
Trials have demonstrated that subjective adverse effects are less frequent with class ic drugs, sotalol, and dofetilide compared with such drugs as quinidine and doxorubicin
Although ibutilide is the only drug approved in the United States for acute termination of atrial fibrillation and atrial flutter, other therapies have been used for this purpose, including intravenous administration of procainamide as well as oral loading of multiple different agents such as quinidine, procainamide, propafenone, and flecainide.30 It is difficult to compare the efficacy of ibutilide with other drugs using previously published studies given the differences in arrhythmia duration, drug administration, and patient characteristics that exist in the patient populations studied. Several studies have reported that intravenous procainamide can acutely terminate atrial fibrillation flutter with moderate efficacy.3133 One group of investigators31 reported a conversion rate of 58% 15 of 26 patients ; after administration of procainamide 1 g IV. Patients who converted had a shorter duration of arrhythmia 6 7 days ; than those who did not convert 79 88 days ; . In another study32 of 21 patients who received 20 mg kg procainamide, 43% 9 patients ; converted to normal sinus rhythm. The arrhythmia duration was 5 days in 19 of the 21 patients. In a comparative study with intravenous flecainide, 33 procainamide at a dose of 1 g converted 25 65% ; of 40 patients with atrial fibrillation flutter of 24 hours' duration. Although these studies indicate that intravenous procainamide is useful in this clinical setting, particular caution should be used when conversion rates are compared with other drugs such as ibutilide, because most patients in these trials had arrhythmias of relatively recent onset. Substantial clinical data now indicate that probably the most important predictor of successful pharmacological conversion of atrial fibrillation flutter with any agent is the pretreatment duration of the arrhythmia. Therefore, data regarding comparative efficacy can only be obtained in randomized clinical trials in which drugs are compared in the same patient population. More limited data are also available from noncomparable clinical studies for sotalol and amiodarone. A group of 48 patients having atrial fibrillation flutter for 7 days were randomized to receive either placebo or sotalol at a dose of either 1.0 or 1.5 mg kg IV.34 Patients who received placebo initially could subsequently receive 1.0 or 1.5 mg kg sotalol in an open-label phase. In total, 5 19% ; of 26 patients receiving placebo converted to normal sinus rhythm compared with 4 17% ; of 23 and 4 18% ; of 22 patients receiving sotalol at doses of 1.0 and 1.5 mg kg, respectively. The success rate of acute conversion with intravenous amiodarone has been similarly disappointing. In a comparative trial35 with intravenous dofetilide, administration of amiodarone 5 mg kg ; led to a conversion rate of 4% compared with 4% for placebo and 35% for dofetilide 8 g kg ; Finally, a recent study36 reported on the success of oral loading regimens of propafenone 400 to 600 mg ; , propafenone plus digoxin 0.75 to 1.0 mg in 24 hours ; , and quinidine 1100 mg ; plus digoxin for atrial fibrillation flutter of 24 hours duration. Not surprisingly, a high rate of conversion was seen not only with propafenone plus digoxin 89% ; and quinidine plus digoxin 84% ; but also with placebo 77% ; at 24 hours. In studies which have appeared in abbreviated form ; that directly compare the efficacy of ibutilide to other therapies, the drug was found to be superior to intravenous administration of and dofetilide.
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INTRODUCTION The "rapidly-activating" delayed rectifier K + current, IKr, has an important role in repolarization of cardiac myocytes in many mammalian species, including humans. Indeed, mutations in the human ERG1 gene HERG1 ; , which codes for the cardiac IKr, lead to the long QT syndrome and increase the susceptibility to drug-induced arrhythmias 13, 27 ; . IKr was first described in guinea pig ventricular 28 ; and atrial 29 ; cells, and the properties of IKr have subsequently been characterized in a wide variety of other mammalian cardiac myocytes 34 ; . In addition to its role in action potential repolarization in atrial and ventricular myocytes, IKr has also been shown to contribute to repolarization and pacemaking in the SAN of mammalian heart 4, 11, 35 ; . Class III antiarrhythmic methanesulfonanilide drugs such as dofetilide UK-68, 798 ; and E-4031, at concentrations that block IKr selectively, reduce the spontaneous pacing rate, slow the rate of repolarization and depolarize the maximum diastolic potential of single pacemaking cells isolated from rabbit 14, 18, 24, ; and guinea pig 22 ; SAN. IKr has been identified in mouse fetal 7, 38, 39 ; and neonatal 23, 24, 39 ; ventricular myocytes, and at a much lower level of expression in the ventricle of adult mice 3 ; and rats 25, 40 ; . Based on the effect of dofetilide on action potential duration, IKr plays an important role in action potential repolarization in ventricular myocytes of fetal and neonatal mouse heart; almost all of the outward current in voltage-clamped fetal ventricular myocytes was blocked by dofetilide. 38, 39 ; . On the other hand, the role of IKr in repolarization in adult mouse and rat myocytes remains unclear. For example, dofetilide had no measurable effect on the action potential duration of adult mouse ventricular myocytes 39 ; or rat papillary muscles and atria 33 ; . In adult rat atrial 25 ; and ventricular 25, 40 ; myocytes the E-40313 and dronabinol.
Keywords: Lysosomal storage disorders, neurodegenerative disease, GM2-gangliosidosis, Niemann-Pick type C. INTRODUCTION The lysosome is an intracellular organelle that represents the terminal compartment in the endosomal-lysosomal pathway. It maintains an acidified milieu enriched with catabolic enzymes to facilitate the degradation of various byproducts of cellular turnover. Mutations within the genes that encode distinct acid hydrolases lead to the progressive accumulation of incompletely metabolized substrates within various tissues, and ultimately a disruption of organ function. Characteristic disease manifestations may include distinctive facial features, organomegaly, skeletal problems and central nervous system CNS ; dysfunction. As a group, these disorders are commonly referred to as the lysosomal storage diseases LSD inborn errors of metabolism that have traditionally been classified according to the biochemical nature of the incompletely degraded tissue deposits [1]. The glycosphingolipidoses, comprised by six distinct clinical entities, constitute the most common types of LSDs, with a cumulative incidence of about 1 in 18, 000 [2]. Most of the individual conditions within this group have an eponymous designation e.g., Tay-Sachs disease, AndersonFabry disease ; in recognition of the investigator s ; who provided seminal description of the typical manifestations and clinical course of specific variants, often prior to elucidation of their underlying biochemical and or molecular basis. Until recently, therapy for the glycosphingolipidoses was primarily palliative; although bone marrow transplantation.
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Bepridil cisapride dofetilide levomethadyl mesoridazine pimozide terfenadine thioridazine ziprasidone other interactions certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur and dss.
Class III antiarrhythmic drugs show promise as effective treatments for the suppression of potentially lethal cardiac arrhythmias. Dofetilide UK-68, 798 ; , is a potent class III antiarrhythmic agent that is presently under clinical investigation. The objective of this study was to determine whether [3H]dofetilide could be used as a specific radioligand for the rapidly activating delayed rectifier K' channel of the heart. We find that [3H]dofetilide binds to high-affinity sites on guinea pig cardiac myocytes. Competition studies using unlabeled dofetilide indicate that binding is characterized by an IC50 of 10030 nM mean + SD, n 13 ; . Scatchard analyses of binding indicate a Kd of 706 nM and a maximal binding capacity of 0.300.02 pmol mg protein. [3H]Dofetilide is displaced from guinea pig myocytes by dofetilide, clofilium, quinidine, sotalol, and sematilide with a rank order of potency that correlates with functional blockade of the rapidly activating delayed rectifier K' current correlation coefflicient, 0.951; slope, 0.990.19; p 0.014 ; . High-affinity [3H]dofetilide binding is not detected in rat myocytes, which are devoid of delayed rectifier K' current. We conclude that [3H]dofetilide specifically binds to sites associated with the rapidly activating delayed rectifier K' channel of guinea pig myocardium. Circulation Research 1993; 72: 707-714 ; KEY WoRDs * dofetilide * radioligands * delayed rectifier K' channels * antiarrhythmic agents and dok.
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