Role of cardiac parasympathetic dysfunction in atrial natriuretic peptide response to volume changes in patients with chronic renal failure

Plasma atrial natriuretic peptide (ANP) was measured by radioimmunoassay in 10 patients with end-stage renal failure during two successive 150-min periods of ultrafiltration and perfusion of an identical fluid volume (1,800-2,400 ml). The patients were divided into two groups of 'denervated' and 'intact' patients based on three different tests for cardiac parasympathetic dysfunction. Plasma ANP was higher in the denervated group than in the intact group throughout all the study, but decreased with the volume ultrafiltered and increased with the volume perfused in both groups. The sensitivity of ANP response to perfusion was greater in denervated than in intact patients. These results demonstrate the close relationship between plasma ANP and stepwise decremental or incremental changes in extracellular fluid volume. They also suggest that cardiac parasympathetic innervation plays a role in modulation of ANP secretion in humans.