Pro-Arrhythmic or Anti-Arrhythmic: The Role of Multi-Site Left Ventricular Pacing in Heart Failure

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David Muller
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The temporal relationship of changes in atrial natriuretic peptide (ANP) secretion to other pathophysiological changes in heart failure has not been investigated. We studied the hemodynamic, hormonal, and metabolic changes before, during, and after the induction of heart failure in eight sheep using a 14-day period of rapid left ventricular pacing (LVP). Arterial pressure declined 21% on the first day, while cardiac output fell progressively to 48% of base line, and atrial pressures rose to a plateau over the first week. Plasma ANP levels increased 10-fold with a close correlation to left atrial pressure in all sheep. Furthermore, ANP secretion appeared to be sustained throughout the LVP period but did not prevent avid sodium retention. Marked and early activation of the renin-angiotensin system was observed, whereas the major increase in plasma aldosterone commenced 4 days later. On termination of LVP, a prompt natriuresis and diuresis occurred with return of all parameters toward base line. Thus this ovine model is useful for studying pathophysiological changes during the onset and offset of heart failure.


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