Increased ascitic fluid prorenin in the ovarian hyperstimulation syndrome.

Three patients developed severe ovarian hyperstimulation syndrome (OHS) as a complication of ovarian hyperstimulation for in vitro fertilization. These patients presented with ovarian enlargement, vascular volume depletion, pleural effusions, and exudative ascites. A unique feature of the ascites in OHS was the markedly elevated renin concentration, the majority of which was prorenin. We speculate the renin-angiotensin system (RAS) may play a pathophysiologic role in the localized capillary leak that develops in OHS.