We randomly allocated women @:@:@ , with randomly sized blocks and stratified by participating centre and gestational age ( < @ weeks vs @ weeks ) , to three timing of delivery plans , which differed according to antenatal monitoring strategies : reduced cardiotocograph fetal heart rate STV ( CTG STV ) , early DV changes ( pulsatility index > @th percentile ; DV p@ ) , or late DV changes ( A wave -LSB- the deflection within the venous waveform signifying atrial contraction -RSB- at or below baseline ; DV no A ) .