Basic Research in Cardiology

, Volume 91, Issue 4, pp 319–328 | Cite as

Contribution of the ventricles and the atrial appendages to the elevation of plasma atrial natriuretic factor (ANF) during pacing-induced heart failure in conscious dogs

  • W. Shen
  • X. Xu
  • M. Ochoa
  • G. A. Zeballos
  • J. M. Stewart
  • T. H. Hintze
Original Contribution

Abstract

The goal of our study was to determine whether the elevation in plasma ANF was produced by the atrial appendages or ventricular tissue during pacing-induced heart failure in chronically instrumented conscious dogs (sham) or dogs with bilateral atrial appendectomy. Acute volume expansion caused a significant elevation of plasma ANF from 80±8 to 149±26 pg/ml (p<0.01) in sham dogs, but caused no significant change from 67±7 to 84±8 pg/ml in atrial appendectomized dogs. There were increases in left ventricular end-diastolic pressure (LVEDP) and left atrial pressure (LAP) in both groups of dogs. After rapid left ventricular pacing (210–240 beats/min) for 4 weeks to induce heart failure, dogs in both groups had tachycardia, elevated LVEDP and higher LAP. Plasma ANF was increased by 250% to 283±64 pg/ml (p<0.01) in sham dogs, and only 40% to 94±15 pg/ml (p>0.05) in atrial appendectomized dogs. In response to volume expansion, there were further increases in LVEDP and LAP in both groups of dogs, but plasma ANF was not elevated (288±39 pg/ml) in sham dogs and only slightly increased (132±7 pg/ml) in atrial appendectomized dogs. Our results suggest that, during pacing-induced heart failure, the atrial appendages are the major source of elevated plasma ANF, and the remaining atrial and ventricular tissue, even when maximally stretched, can only modestly increase plasma ANF.

Key words

Atrial natriuretic factor (ANF) atrial function volume expansion heart failure ventricular compliance 

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Copyright information

© Steinkopff Verlag 1996

Authors and Affiliations

  • W. Shen
    • 1
  • X. Xu
    • 1
  • M. Ochoa
    • 1
  • G. A. Zeballos
    • 1
  • J. M. Stewart
    • 2
  • T. H. Hintze
    • 1
  1. 1.Department of PhysiologyNew York Medical CollegeValhallaUSA
  2. 2.Department of PediatricsNew York Medical CollegeValhallaUSA

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