|Technique||Results (number of trials, number of patients)|
|Preoxygenation||Improved arterial oxygen saturation (Sa02) (2 trials, n=12 and n=17)|
|Hyperoxygenation||Maintained O2 levels in mechanically ventilated patients (4 trials, n=10–24)|
|Hyperoxygenation + hyperinflation||Added value of hyperinflation unclear in mechanically ventilated patients (4 trials, n=10–24)|
|Double lumen insufflation catheters||Maintained O2 levels throughout suctioning at flow rates of 10–15 l/min (4 of 5 trials, n=10–38)|
|Hyperinflation alone||Unclear benefits on O2 levels after cardiac surgery; increase in blood pressure (4 trials, n=8–34). Increase in volume may result in increased intracranial pressure in patients with head injury (2 trials, n=10–37)|
|Oxygenation using a manual resuscitation bag v ventilator||Ventilators were more effective for oxygen delivery (greater increases in PAO2) (3 of 4 trials, n=10–33)|
|Open v closed suctioning systems||No difference for nosocomial pneumonia (3 trials, n=20–84, all had insufficient power) or mortality (1 trial, n=84). Greater decrease in PaO2 (1 trial, n=8, not clinically significant)|
|Saline instillationy||No difference for oxygenation, gas exchange, heart rate, or blood pressure in ventilated and non-ventilated patients with tracheostomies (5 trials, n=15–45)|
Review: several techniques optimise oxygenation during suctioning of patients
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