Regarding hemodynamic changes in pregnancy, all of the following are true except :-
Cardiac Output : Stas increasing by as early as 5th week increases by 30% (6litres/Min) reaches to peak at 32nd -34th week antenatally Even higher during labour and its maximum immediate post paum Hea Sounds in Pregnancy: - Exaggerated splitting of the first hea sound and increased loudness of both components A loud easily heard third sound >95% develop systolic murmur which disappears after delivery. 20% have a transient diastolic murmur. >10% develop continuous murmur due to increase mammary blood flow. Systemic Pressure changes; Early or mid pregnancy fall in BP late pregnancy rise in BP Hea rate increases (10-20%). Stroke volume increases (10%). Mean aerial blood pressure decreases (10%). Peripheral resistance decreases (35%)
Hemodynamic changes sta taking place after 12 weeks of gestation
Venocaval compression begins at about 16 weeks of gestation
There is midtrimester fall in blood pressure
Systolic murmur may occur normally
Physiological Changes of Pregnancy