The following are indications for assisted ventilation in acute severe asthma EXCEPT?

A. PEFR 50-60% of predicted value

B. Rising PaCO2> 6kPa (45 mm Hg)

C. Diminishing level of consciousness

D. Falling PaO2< 8kPa (60 mm Hg)

Correct Answer: PEFR 50-60% of predicted value

Description: PEFR of 50-60% indicates moderate asthma. Indication for intubation in asthma exacerbation is a poor response to oxygen with salbutamol nebulisation and oral steroids. The definition of poor response is: 1. FEV1< 40%. 2. PaCO2> 45mmHg. 3. Features of carbon dioxide narcosis. 4. Hypoxia defined as PaO2<60 mm Hg.

Category: Medicine

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