Plasma volume and its regulatory factors in congestive heart failure after implantation of long-term left ventricular assist devices

Circulation
K B JamesF M Fouad-Tarazi

Abstract

Congestive heart failure is associated with blood volume expansion caused by stimulation of the renin-aldosterone system and arginine vasopressin. The use of left ventricular assist devices as bridges to heart transplantation has improved the survival of patients during this critical period. In studying heart failure physiology on support devices, we hypothesized that improvement of cardiac function by a left ventricular assist device is associated with normalization of volume load secondary to normalization of its regulatory substances. We studied 15 patients (13 men, 2 women: age 51 +/- 8 years) with end-stage heart failure who were cardiac transplant candidates eligible for HeartMate implantation. We measured plasma volume and plasma levels of atrial natriuretic peptide, aldosterone, renin, and arginine vasopressin sequentially before HeartMate implantation (baseline), after HeartMate implantation (weeks 4 and 8), and after transplantation. Baseline plasma volume was 123 +/- 20% of normal; it was 122 +/- 22% at week 4 and decreased to 115 +/- 14% at week 8. Atrial natriuretic peptide was 359 +/- 380 pg/mL at baseline, 245 +/- 175 pg/mL at week 4, and 151 +/- 66 pg/mL at week 8. Plasma aldosterone fell from 68 +/- 59 ng/dL at...Continue Reading

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