Regional anaesthesia has been the preferred technique of anaesthesia, especially in obese pregnant patients. Induction of spinal anaesthesia will cause profound haemodynamic changes that represent the greatest hazard to the mother and the foetus. Evidence suggests these haemodynamic changes are common after spinal anaesthesia and results in hypotension causing unconsciousness, maternal nausea and vomiting, dizziness including deleterious effects on the foetus like neonatal acidaemia and lower APGAR score. However because of the changes in peripheral vascular resistance, changes in maternal arterial pressure do not necessarily reflect changes in maternal cardiac output. These changes in cardiac output and associated oxygen delivery pose the greatest risk to the foetus.