Sample size calculation
preeclampsia
PREECLAMPSIA
Using the (open Epi) program, the sample size was calculated to be 60 cases divided into 2 equal groups, (30 subjects) in each group. This was done based on assuming that the middle cerebral artery means velocity before and after labetalol administration in preeclampsia patients was 65 ± 10 versus 64 ± 12cm/s [