Table I.
Cardiopulmonary symptoms
Electrocardiographic signs typical of ischaemia
Global indices of insufficient O2 release, evaluated by invasive methods
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Notes
At term, pregnant women have about a 45% increase (about 1.5 L) in blood volume, with a greater increase in plasma than in red blood cells, leading to the so-called haemodilution anaemia of pregnancy which reduces the Htc by about 10%6.
Tachycardia may already be present at baseline in pregnant women or develop as the result of an infusion of a tocolytic6.
Placental perfusion in patients with hypertensive disorders during pregnancy, such as pre-eclampsia or haemolytic anaemia with elevated liver enzymes and low platelet count (HELLP) syndrome, can be inadequate at blood pressure values tolerated by other patients because of the increased peripheral resistance6.