pulsitility

— The fetal arterial and amniotic catheters were connected to sterile pressure transducers (COBE; Argon Division, Maxim Medical, Athens, TX, USA), and calibrated mean fetal arterial blood pressure (corrected for amniotic pressure) and fetal heart rate (triggered via a tachometer from the pulsitility in the arterial blood pressure signal) were recorded continually using a computerized Data Acquisition System (DAS; Department of Physiology, Cambridge University, Cambridge, UK).