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Intracellular Ca(2+) waves (CaWs) of cardiomyocytes are spontaneous events of Ca(2+) release from the sarcoplasmic reticulum that are regarded as an important substrate for triggered arrhythmias and delayed afterdepolarizations. However, little is known regarding whether or how CaWs within the heart actually produce arrhythmogenic membrane oscillation(More)
The calcium (Ca(2+))-paradox injury of the heart, induced by restoration of extracellular Ca(2+) after its short-term depletion, is known to provoke cardiomyocyte contracture. However, undetermined is how the Ca(2+)-paradox provokes such a distinctive presentation of myocytes in the heart. To address this, we imaged sequential intracellular Ca(2+) dynamics(More)
We investigated the association between sympathetic nerve activity and delayed rectifier potassium current (I(K)) in hypertrophic rat hearts. Left ventricular hypertrophy was induced by a 50% constriction of suprarenal abdominal aorta for 6 weeks. The effects of isoproterenol on action potential duration (APD), I(K), and L-type calcium current (I(Ca)) were(More)
The aim of this clinical crossover study was to elucidate the effects of atrioventricular (AV) synchronous pacing on cardiac function in patients with sick sinus syndrome (SSS). Thirty SSS patients, each with dual chamber pacemaker (DDD), were enrolled and divided into two groups based on echocardiographic findings. Group A (n = 16) had hypertensive heart(More)
Hypercholesterolemia is a risk factor for development of coronary artery disease (CAD), however, several reports have suggested that low serum cholesterol is associated with a worse prognosis in patients with congestive heart failure (CHF). The objective of this study was to determine the prognostic value of cholesterol for CHF. The study subjects consisted(More)
A 59-year-old woman with skin sarcoidosis was admitted to hospital for assessment of complete atrioventricular block. Cross-sectional echocardiography showed that the apical free wall of the right ventricle was thin and dyskinetic with dilation of the right ventricle. Thallium-201 myocardial imaging revealed a normal distribution. Both gallium-67 and(More)
AIMS Alteration of connexin43 (Cx43)-mediated intercellular communication is known to promote susceptibility to ventricular tachyarrhythmias. However, the precise mechanism of the altered Cx43 responsible for arrhythmogenesis remains unclear. We sought to understand changes in impulse propagation of ventricular myocytes under dominant-negative (DN)(More)
Purkinje fibers play essential roles in impulse propagation to the ventricles, and their functional impairment can become arrhythmogenic. However, little is known about precise spatiotemporal pattern(s) of interconnection between Purkinje-fiber network and the underlying ventricular myocardium within the heart. To address this issue, we simultaneously(More)
The occurrence and the duration of paroxysmal atrial fibrillation (AF) are influenced by vagal tone. Paroxetine, an antidepressant, can modulate vagal tone at the level of the mid-brain and inhibit the vasovagal reflex. In this study, oral paroxetine 10 mg/day was administered to patients with multidrug-resistant paroxysmal AF. Nine consecutive men(More)