Anaes Vivas · Applied cardiovascular & respiratory physiology
Clinical viva — preoxygenation and the safe apnoea time
A clinical viva on the preoxygenation — the denitrogenation of the FRC, the build-up of the alveolar and the FRC oxygen reserve, the end-tidal oxygen target (90 per cent), the factors that shorten the safe apnoea time (the obesity, the pregnancy, the child, the sepsis), and the apnoeic oxygenation (the THRIVE).
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Prompt
A junior colleague asks why and how you preoxygenate, and what determines the safe apnoea time. Explain the physiology.
Stimulus
A junior colleague asks why and how you preoxygenate before the induction, and what determines the safe apnoea time. Explain the physiology.
References2ShowHide
- [4]Nimmagadda U, et al. Preoxygenation: physiologic basis, benefits, and potential risks. Anesth Analg, 2017.PMID 28099321
- [28099322]Bersten AD, Soni N (eds) Oh's Intensive Care Manual. 8th edition, Elsevier, 2018.