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tachycardia/phosphatase
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Protein phosphatase 1b in the solitary tract nucleus is necessary for normal baroreflex function.
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Despite positive metabolic effects, genetic deletion of protein phosphatase 1b (PTP1b) results in sympathetically mediated elevations in arterial pressure (AP) in mice. Because several PTP1b-regulated peptides also impair the baroreflex sensitivity (BRS) for control of heart rate (HR), we
Myocardial Na+,K(+)-ATPase in tachycardia induced cardiomyopathy.
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Na+,K(+)-ATPase is a major determinant of myocyte homeostasis and excitation-contraction. Cardiac glycosides such as digitalis and ouabain increase the inotropic state of the heart through the inhibition of Na+,K(+)-ATPase. While cardiac glycosides are commonly used in the setting of congestive
Population pharmacokinetics of intravenous amiodarone in patients with refractory ventricular tachycardia/fibrillation.
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A population approach was used to determine the pharmacokinetics of amiodarone in 245 patients receiving intravenous amiodarone for the short-term treatment of refractory, hemodynamically destabilizing, ventricular tachycardia and/or fibrillation. A two-compartment model employing proportional
Influence of verapamil on tachycardia-induced alterations of PP1 and PP2A in rabbit atrium.
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BACKGROUND
Long-term atrial fibrillation changes in many regulatory and structural processes may result in stabilization of the arrhythmia. There is evidence that decreased amplitude of L-type Ca(2+) current - probably a key mechanism of atrial remodelling -resulting from changes in expression of
Connexin 43 downregulation and dephosphorylation in nonischemic heart failure is associated with enhanced colocalized protein phosphatase type 2A.
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In nonischemic heart failure (HF), ventricular tachycardia initiates by a nonreentrant mechanism, but there is altered conduction (that could lead to re-entry) that could arise from changes in gap junctional proteins, especially connexin43 (Cx43). We studied Cx43 expression and phosphorylation state
Conduction in the right and left ventricle is differentially regulated by protein kinases and phosphatases: implications for arrhythmogenesis.
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The "stress" kinases cAMP-dependent protein kinase (PKA) and calcium/calmodulin-dependent protein kinase II (CaMKII), phosphorylate the Na+ channel Nav1.5 subunit to regulate its function. However, how the channel regulation translates to ventricular conduction is poorly
Constitutively active phosphatase inhibitor-1 improves cardiac contractility in young mice but is deleterious after catecholaminergic stress and with aging.
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Phosphatase inhibitor-1 (I-1) is a distal amplifier element of beta-adrenergic signaling that functions by preventing dephosphorylation of downstream targets. I-1 is downregulated in human failing hearts, while overexpression of a constitutively active mutant form (I-1c) reverses contractile
Protein phosphatase 2A regulatory subunit B56α limits phosphatase activity in the heart.
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Protein phosphatase 2A (PP2A) is a serine/threonine-selective holoenzyme composed of a catalytic, scaffolding, and regulatory subunit. In the heart, PP2A activity is requisite for cardiac excitation-contraction coupling and central in adrenergic signaling. We found that mice deficient in the PP2A
Ankyrin-B Q1283H Variant Linked to Arrhythmias Via Loss of Local Protein Phosphatase 2A Activity Causes Ryanodine Receptor Hyperphosphorylation.
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QRS/T-wave and calcium alternans in a type I diabetic mouse model for spontaneous postmyocardial infarction ventricular tachycardia: A mechanism for the antiarrhythmic effect of statins.
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The incidence of sudden arrhythmic death is markedly increased in diabetics.
The purpose of this study was to develop a mouse model for postmyocardial infarction (post-MI) ventricular tachycardia (VT) in the diabetic heart and determine the mechanism of an antiarrhythmic effect of statins.
ECG
Multiple potential molecular contributors to atrial hypocontractility caused by atrial tachycardia remodeling in dogs.
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BACKGROUND
Atrial fibrillation impairs atrial contractility, inducing atrial stunning that promotes thromboembolic stroke. Action potential (AP)-prolonging drugs are reported to normalize atrial hypocontractility caused by atrial tachycardia remodeling (ATR). Here, we addressed the role of AP
Angiotensin II type 1 receptor mediates partially hyposmotic-induced increase of I (Ks) current in guinea pig atrium.
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A repolarizing conduction in the heart augmented by hyposmotic or mechanically induced membrane stretch is the slow component of delayed rectifier K(+) current (I (Ks)). I (Ks) upregulation is recognized as a factor promoting appearance of atrial fibrillation (AF) since gain-of-function mutations of
Methimazole-induced cholestatic jaundice in an elderly hyperthyroid patient.
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BACKGROUND
Hyperthyroidism is a common disease in the elderly. Antithyroid medications such as methimazole are one of the few treatment options.
METHODS
A 76-year-old white woman presented to the clinic with a 1-week history of fatigue, sleepiness, 7-pound weight loss, and tachycardia. Her blood
Ascites and liver test abnormalities during severe ovarian hyperstimulation syndrome.
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OBJECTIVE
Severe ovarian hyperstimulation syndrome is an uncommon cause of ascites that is being increasingly recognized because of the high number of women undergoing assisted reproductive techniques, mainly in vitro fertilization. This prospective study investigates the clinical and biochemical
Synthesis and preliminary characterization of a novel antiarrhythmic compound (KB130015) with an improved toxicity profile compared with amiodarone.
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Recent developments in antiarrhythmic therapy have indicated that the best approach to pharmacologically controlling supraventricular arrhythmias and life-threatening ventricular tachyarrhythmias is by prolonging cardiac repolarization rather than by blocking conduction. In this context, amiodarone
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