title: End-tidal oxygraphy and safe duration of apnoea in young adults and elderly patients.
abstract: Using an end-tidal fractional oxygen concentration of 0.9 as an end point for pre-oxygenation, we have compared the time taken to achieve this end point and the safe duration of apnoea after induction of anaesthesia following pre-oxygenation in elderly patients and young adults. The times taken to reach the end point of pre-oxygenation and for the oxygen saturation to decrease to 92% during a period of apnoea were found not to be significantly different between the two age groups. It is concluded that in spite of the physiological changes that occur with age, end-tidal oxygen concentration monitoring is as useful in the elderly population as in young adults as an end point for pre-oxygenation.
authors.affiliation: Department of Anaesthesiology, M.G. Hospital, Dr S.N. Medical College, Jodhpur (Raj.), India.
authors.forename: P K
authors.initials: PK
authors.lastname: Bhatia
authors.forename: S C
authors.initials: SC
authors.lastname: Bhandari
authors.forename: K L
authors.initials: KL
authors.lastname: Tulsiani
authors.forename: Y
authors.initials: Y
authors.lastname: Kumar
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D001049:Apnea / Q000503:physiopathology*; D002245:Carbon Dioxide / Q000502:physiology; D005260:Female; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods; D010100:Oxygen / Q000502:physiology; D010102:Oxygen Inhalation Therapy; D011300:Preoperative Care; D012129:Respiratory Function Tests; D013997:Time Factors
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen