Mechanical Ventilation for Severe Asthma

Severe asthma exacerbations require a precise mechanical ventilation strategy focused on mitigating dynamic hyperinflation and auto-PEEP. Because airway resistance can increase significantly, the primary goal is controlled hypoventilation, which prioritizes adequate expiratory time over normalizing carbon dioxide levels. Volume control ventilation is preferred, as it allows clinicians to guarantee minute ventilation while utilizing high inspiratory flow rates to shorten inspiratory time. Monitoring must include serial measurements of peak inspiratory and plateau pressures, alongside careful analysis of flow waveforms to detect persistent end-expiratory flow. Clinicians should avoid aggressive ventilation, which exacerbates air trapping and risks barotrauma or hemodynamic collapse. Dr. Emily Damuth, an expert in critical care and mechanical ventilation, emphasizes that frequent, small adjustments based on objective data are vital for stabilizing these high-acuity patients and preventing lethal outcomes.