<prompt> The following are indications for assisted ventilation in acute severe asthma EXCEPT?PEFR 50-60 of predicted valueRising PaCO2 6kPa 45 mm HgDiminishing level of consciousnessFalling PaO2 8kPa 60 mm Hg  <response>: 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 PaO260 mm Hg. 