- The heart muscles particularly the left ventricle hypertrophy leading to enlargement of heart. The growing uterus pushes the heart upwards and to the left side.
- During pregnancy the heart rate and stroke volume ( The amount of blood pumped by the heart each beat ) increased.
- The cardiac output ( The rate which blood is pumped by heart expressed as liter/min. ) increased markedly by end of the first trimester.
- Femoral venous pressure is markedly raised specially in the later months. It is due to pressure exerted by the gravid uterus on common iliac vein, more on right side due to dextrarotation of the uterus.
Que.- Why the heart rate and stroke volume is increased during pregnancy ?
Ans.- It is due to increased oxygen requirement of the maternal tissue and growing fetus.
Normal heart rate and stroke volume is not fulfill the needs of mother and fetus. So it is
increase in normal way.
Que.- Why BP does not rise in pregnancy, although the cardiac output increased ?
Ans.- In pregnancy, the BP does not rise because of the reduction in peripheral resistance.
The capacity of vein and venules increase. Arterial wall reflex and dilate due to the
effect of progesterone.
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