Anaesthesia
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Randomized Controlled Trial Clinical Trial
The effect of positive airway pressure during pre-oxygenation and induction of anaesthesia upon duration of non-hypoxic apnoea.
Positive end-expiratory pressure (PEEP) applied during induction of anaesthesia may prevent atelectasis formation in the lungs. This may increase the duration of non-hypoxic apnoea by increasing the functional residual capacity. We studied the benefit of PEEP applied during the induction of anaesthesia on the duration of apnoea until the SpO2 reached 90%. ⋯ The duration of apnoea until SpO2 reached 90% was measured. Non-hypoxic apnoea duration was longer in the PEEP group compared to ZEEP group (599 +/- 135 s vs. 470 +/- 150 s, p = 0.007). We conclude that the application of positive airway pressure during induction of anaesthesia in adults prolongs the non-hypoxic apnoea duration by > 2 min.
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Breathing system filters are recommended for use during anaesthesia to protect the patient from inhaling gas-borne particles. Filters placed at the patient connection port of the breathing system can also humidify the inspired gases. ⋯ The moisture content of the end-inspired air at the end of the 3-min period varied from 6.4 to 27.8 and from 4.4 to 25.9 g.m-3 for tidal volumes of 0.5 and 1.0 l, respectively (p < 0.0001 for all pairwise comparisons of the five filters and for the two tidal volumes). Those breathing system filters that have at least an adequate level of performance (at least 20 g.m-3) will generally achieve this level within the 3-min pre-oxygenation period.
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Letter Case Reports
Difficult intubation due to ossification of the anterior longitudinal ligament.