Journal of Anesthesia

, Volume 25, Issue 2, pp 189–194 | Cite as

Preoxygenation with 20º head-up tilt provides longer duration of non-hypoxic apnea than conventional preoxygenation in non-obese healthy adults

  • Venkateswaran Ramkumar
  • Goneppanavar UmeshEmail author
  • Frenny Ann Philip
Original Article



Failed airway is the anesthesiologist’s nightmare. Although conventional preoxygenation can provide time, atelectasis occurs in the dependent areas of the lungs immediately after anesthetic 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 (group C) with 20º head-up tilt (group H) and 5 cmH2O PEEP (group P) in non-obese individuals for non-hypoxic apnea duration.


A total of 45 patients were enrolled (15 in each group). After 5 min of preoxygenation, intubation was performed after induction of anesthesia with thiopentone and succinylcholine. After confirming the tracheal intubation by esophageal detector device and capnogram, all patients were administered vecuronium to maintain neuromuscular blockade and midazolam to prevent awareness. Post-induction, patients in all groups were left apneic in supine position with the tracheal tube exposed to atmosphere till the SpO2 dropped to 93% or 10 min of safe apnea was achieved.


The demographic data were comparable. Non-hypoxic apnea duration was higher with group H (452 ± 71 s) compared to group C (364 ± 83 s, P = 0.030). Group P did not show significant increase in the duration of non-hypoxic apnea (413 ± 86 s). There were no adverse outcomes or events.


Preoxygenation is clinically and statistically more efficacious and by inference more efficient in the 20º head-up position than with conventional technique in non-obese healthy adults. Although application of 5 cmH2O PEEP provides longer duration of non-hypoxic apnea compared to conventional technique, it is not statistically significant.


Preoxygenation Apnea PEEP Head-up tilt 


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Copyright information

© Japanese Society of Anesthesiologists 2011

Authors and Affiliations

  • Venkateswaran Ramkumar
    • 1
  • Goneppanavar Umesh
    • 1
    Email author
  • Frenny Ann Philip
    • 1
  1. 1.Department of AnaesthesiologyKasturba Medical CollegeManipalIndia

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