RESUMO
Background: Induction of anaesthesia is accompanied byintravaneous sodium pentothal or inhalation of an appropriatemixture of Halothane, Nitrous oxide and oxygen.Aims and Objectives: 1) To study the vital capacity singlebreath induction using Halothane, Nitrous oxide and OxygenMixture. 2) To compare the efficiency and acceptance of abovemethod with i/v Sodium Pentothal induction.3) To access anycomplication arising from above technique.Methods: Patients were randomly divided in two equal of 25each belonging to ASA grade 1.Group A: Patient was given intravenous sodium Pentothal withan intravenous drip of 5% dextrose solution.Group B: Patients were given a mixture of 4% Halothane in66%N2o and 33% oxygen by using mapleson. A breathingsystem (Vital Capacity Breath)Results: It has been observed that there was no clinicallysignificant fluctuation in pulse rate and arterial pressure at anytime during induction. 1) No patient developed arrhythmiaduring induction in thiopentone group while one patient inhalothane group developed transient ventricular ectopic 1minute after starting the induction. 2) Except one patient whohad coughing during induction with thiopentone, induction wassmooth in all. Nausea and vomiting were more withthiopentone group as compared to halothane group. 3) The