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Surgery
Generally accepted indications for mechanical ventilatory support include
PaO2 of less than 70 kPa and PaCO2 of greater than 50 kPa while breathing room air
Alveolar-arterial oxygen tension difference of 150 kPa while breathing 100% O2
Vital capacity of 40-60 mL/kg
Respiratory rate greater than 35 breaths/min
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