<prompt> A 25 year old G2P, at 39 weeks gestation is electing to have spinal anaesthesia for a repeat cesarean section. 5 minutes after bupivacaine spinal injection, the patient becomes hypotensive and is complaining of tingling in her fingers with subjective difficulty breathing. Her oxygen saturation remains 100 and blood pressure in 9060 mmHg The most likely etiology is.Severe patient anxietyIncreased peripheral nerve sensitization to local anaestheticsDecrease in volume of CSF in subarachnoid space facilitated higher spread of local anaestheticsEngorgement of epidural veins contributed to inadvertent intravascular injection of local anaesthetic  <response>: In pregnancy, CSF volume is decreased, thereby decreasing dose requirement of local anaesthetic. This facilitates spread of local anaesthetic when spinal anaesthesia is given.Option D would have been correct, if question mentioned Epidural anaesthesia. 