Mean arterial pressure , cardiac output , peripheral vascular resistance , and serum levels of progesterone , plasma concentrations of aldosterone , norepinephrine , and plasma renin activity were measured in all patients on postovulatory day 7 of the spontaneous menstrual cycle preceding IVF ( baseline ) and 7 days after the hCG/recombinant human LH ovulatory injection during the IVF cycle .
