A 36-year-old female patient with a history of asthma is admitted to the ICU from the emergency department.Her respirations are 30,very labored,with accessory muscle use and bilateral inspiratory and expiratory wheezing.There is bilateral hyperresonance during chest percussion.A blood gas taken in the ICU after 1 hour of continuous aerosolized albuterol (15 mg)reveals: pH 7.38,partial pressure of carbon dioxide (PaCO₂)42mm Hg,partial pressure of oxygen (PaO₂)53 mm Hg,oxygen saturation (SaO₂)88%,bicarbonate (HCO₃-)25 mEq/L with nasal cannula 6 L/min.The patient is 5'5" and weighs 135 lbs.The most appropriate action at this time is which of the following?

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The assessment and arterial blood gases (ABG)for this patient reveals impending respiratory failure.This patient should be intubated and may possibly require sedation and paralysis,depending on the ability to ventilate with synchrony.Therefore,continuation of the current therapy is not appropriate.Noninvasive positive pressure ventilation (NPPV)is not appropriate with asthma patients who are in respiratory failure and may be unable to provide airway protection.The settings for the volume-controlled continuous mandatory ventilation (VC-CMV)are not appropriate because the tidal volume is set too high,the frequency too low,and the peak flow too low.This would not allow enough time for exhalation and may cause barotrauma.The pressure-controlled continuous mandatory ventilation (PC-CMV)mode will allow for more control over the pressures.The short expiratory time will allow time for exhalation that will decrease the likelihood of hyperexpansion of the lungs.

A 36-Year-Old Female Patient with a History of Asthma Is