Aortocaval Compression
Due to increasing size and weight of the developing fetus, it is usually advised to pregnant women to lie on their side. The reason is to avoid aortocaval compression. The increased size of uterus along with the developing fetus compress the aorta and inferior vena cava as woman lies on her back. This compression of aorta severely impedes the flow of blood to uterus hence compromising uteroplacental perfusion. On the other hand, compression of inferior vena cava reduces the venous return to heart and hence it is associated with decreased cardiac output. Reference: https://academic.oup.com/bja/article/109/6/950/366613#:~:text=Aortocaval%20compression%20(ACC)%20occurs%20when,1%E2%80%933 Image via: https://aneskey.com/obstetric-anesthesia-7/
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