This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
[{'content': 'True about epidural anaesthesia in pregnancy – a) Given through subarachnoid spaceb) Increases cardiac outputc) Decreases venous returnd) Venous poolinge) Decreased placental circulation \nSelect and explain. \nA. ab, B. bc, C. cd, D. ac', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In epidural anesthesia, local anesthetic is injected into epidural (extradural) space (not in subarachnoid space).\nEpidural anesthesia causes venodilatation with venous pooling of blood that results in decreased venous return → decreased cardiac output and hypotension.\nHypotension from regional anesthesia can decrease uterine blood flow, However in the absence of hypotension neither epidural nor spinal anesthesia have any effect on the uterine blood flow and placental circulation.', 'role': 'assistant'}]