Active Warming During Elective Caesearean Section

During anaesthesia for caesarean section it is common to lose heat and become hypothermic, (\<36 degrees C). In order to try and avoid this all women are given warmed intravenous fluid and insulated from cold surfaces. There are also 2 types of machine available to actively warm women; 1. Forced Air Warming - that uses a disposable sheet the woman lies upon with lots of air pockets that have warm air blown into them continuously by a fan. 2. Conduction Warming Mattress - a thin mattress which covers the operating table and the woman lies on top. The padded mattress has strips of material that heat up when electricity passes through it, similar to a normal electric blanket. We plan to carry out a randomised controlled trial to compare these 2 methods with the current practice of no active warming. The hypothesis for this study is that active warming women during elective caesarean section prevents women\'s temperature from dropping and keeps them more comfortable than if active warming were not used.