 Pregnancy itself is associated with alterations in blood pressure with decreased vascular tone and widening of the pulse pressure. Normal pulse pressure and variations in pregnancy are poorly described. However, in otherwise healthy non-pregnant adults, stroke volume is approximately 1.7 times the pulse pressure 19, 20. Given that the stroke volume in a term pregnancy is approximated to be 100 mLmin, a normal pulse pressure in pregnancy should be approximately 60 mmHg 21. Therefore, a level of 45 mmHg has been proposed to define a low pulse pressure in pregnancy 14. 