SUMMARY A case of cough syncope due to AV conduction block of the heart is reported in
this paper. AV conduction block and lightheadedness were induced by coughing but not by …

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The modulation exerted by atrial natriuretic factor (ANF) on the cardiac and vascular
influences of arterial baroreceptors was investigated in two groups of unanesthetized …

Respiratory sinus arrhythmia (RSA) is the variation of heart rate (or RR interval) in phase
with respiration and has been extensively studied. However, the effect of respiration on …

Electrical stimulation of the carotid sinus nerves was applied during diagnostic
catheterization of two patients who had coronary artery disease. The immediate reflex …

We consider the transient effects of brief bursts of vagal stimulation on cardiac excitation and
conduction as manifested in the clinical electrocardiogram. We hypothesize that such vagal …

We stimulated intracardiac parasympathetic nerve fibers that selectively innervated the
atrioventricular (AV) nodal area (AV parasympathetic stimulation), and the sinoatrial (SA) …

The vagal system regulates the atrioventricular conduction time (T AV) via two opposing
mechanisms: a direct effect on the atrioventricular node and an indirect effect through …

The influence of bilateral carotid sinus nerve stimulation was studied in a patient with atrial
fibrillation. Stimulation resulted after approximately 1.5 s in abrupt prolongation of the …

Several lines of experimental and clinical evidence collected over the past ten years suggest
that the aging process is characterized not only by profound structural cardiovascular …