Question: A 55-year-old asthmatic patient goes to the ER with an exacerbation. One hour after the administration of supplemental oxygen and two nebulizations of salbutamol the patient does not improve. On examination, he breathed at 42 rpm with supraclavicular drainage and presented disseminated inspiratory and expiratory wheezing. The peak flow has dropped from 310 to 220 L / min. A gasometry extracted with oxygen at 28% shows a pO2 of 54 mmHg and a pCO2 of 35 mmHg. Which of the following attitudes seems LESS indicated? 
 Options:  <1> Increase oxygen flow. <2> Administer 80 mg of methylprednisolone iv. <3> Nebulize ipratropium bromide together with salbutamol every 20 minutes. <4> Administer intravenous magnesium <5> Start non-invasive mechanical ventilation.
5