Here's a quote from "Chesley's Hypertensive Disorders...":
In general, mean arterial pressure declines in the first trimester, reaching a nadir between 16 o 20 weeks' gestation with a return to control values near term. Diastolic pressures decline to a greater extent than systolic pressures, the average mean change being about 10mm Hg. (pg 70)
Sorry, still not good at the whole citing a work stuff[;)]
Oh, and I just looked up Nadir, means "lowest point."
Catherine (22), Moderator (pregnant again)
DH Britton (27)
Emma Margaret (03/02/03) 37 weeks from PIH & oligo
Baby #2 due August 11, 2004