The transfer of Ca4' at rest and during contraction has been measured in isolated guinea-pig atria. During contraction, the rate of transfer increases considerably. The increment in the uptake of calcium by the cells of the atria during contraction is closely correlated with the strength of contraction. This relationship is maintained at different frequencies of stimulation and at different con...

We report the case of a 56-year-old female patient with biatrial recurrence of cardiac myxoma and extensive comorbidities. In the literature, only few cases of biatrial myxoma can be found and they generally describe a single tumor reaching both atria. We found two independently growing cardiac myxomas of both atria.

Endothelin-1 (ET-1) and endothelin-3 (ET-3) produced positive inotropic effects on electrically stimulated left atria and increased the frequency of spontaneously beating right atria of adult rats. The potency of the inotropic effect of ET-1 was greater than that of ET-3, but the potencies of the chronotropic effects of ET-1 and ET-3 were not significantly different. In the neonatal atria, ET-1...

Mechanisms regulating stretch response in the left ventricle are investigated in detail but not well understood in atrial myocardium. Hypertrophic growth of atrial myocardium contributes to the pathogenesis of atrial fibrillation. In this study, we sought to elucidate mechanisms of stretch-induced activation of key signaling pathways and hypertrophy-associated genes in rat atria. Stretching of ...

After cardiac transplantation, the denervated donor atria and ventricles demonstrate increased sensitivity to infusions of sympathomimetic amines. Recently, supersensitivity of the canine sinus and atrioventricular (AV) nodes to acetylcholine has also been demonstrated after parasympathetic denervation. Acetylcholine and the endogenous nucleoside adenosine exert similar electrophysiological eff...

We measured plasma atrial natriuretic factor levels and atrial natriuretic factor secretion by isolated left atria from aging rats to determine the secretory response to stretch and adrenergic stimulation. Systolic arterial pressure and right atrial pressure were measured in vivo. Twenty-four hours later, atria were removed and studied in vitro in a perifusion system. After removal, stabilizati...

Watanabe and Tatsuno [1] in their state-of-the-art review on omega-3 fatty acids for the prevention of cardiovascular diseases commented that effects risk atria...

rates ranged between I58 and I94 a minute. This phnomenon (also observed by Lewis, Feil, and Stroud, I918-I920) was manifested by a gradual prolongation of the stimulus-to-atrial electrogram intervals until one stimulus failed to reach the recording electrodes. The localization of the site ofdelay and block could be made exclusivelyfrom the intracardiac recordings, since the surface leads showe...

We present an interesting intracardiac electrogram of a dissimilar atrial rhythm in a patient of bi-atrial orthotopic cardiac transplant.

A fter complete diagnostic workup, a quarter of ischemic strokes are regarded as undetermined pathogenesis at discharge with a substantial rate of mortality in some cases. 1 Paroxysmal atrial fibrillation (PAF) is the most frequent occult cause resulting in significant morbidity and costs when is under diagnosed. 2 Recent studies have shown that extending the cardiac monitoring duration with su...