Abstract :
Purpose: Preoxygenation increases oxygen reserves and duration of apnoea without desaturation (DAWD), thus it provides valuable additional time to secure the airway. Although conventional preoxygenation can provide time, atelectasis occurs in the dependent areas of the lungs immediately after anaesthetic induction. Therefore, alternatives such as positive end-expiratory pressure (PEEP) and head-up tilt during preoxygenation have been explored. We compared the conventional preoxygenation technique in Group I with 150 head up tilt in Group II in non-obese individuals for non-hypoxic apnoea duration.
Materials & Methods: Sixty patients scheduled for various elective surgical procedures belonging to ASA Grade I and ASA Grade II were included in study. The study was designed to be a double blind randomized controlled study. Anaesthesia was induced with Inj. Thiopentone 5mg/kg IV till the loss of eyelash reflex. Adequacy of mask ventilation was confirmed. Inj. Rocuronium 0.9mg/kg IV was given. The patient was disconnected from the breathing system. The duration of apnoea was recorded as from the time of administration of rocuronium to the time the SpO2 falls to
Keyword :
Preoxygenation, Apnoea, Supine, Head-up tilt, DAWD (Duration of Apnoea without Desaturation)