Respiratory drive is a critical yet often underappreciated determinant of outcome during mechanical ventilation. Both insufficient and excessive drive can cause harm: Low drive promotes diaphragm atrophy, whereas high drive may contribute to lung and diaphragm injury. A key clinical challenge is the potential dissociation between drive and effort in patients with respiratory muscle weakness, where high drive may not translate to adequate muscular output. Simple bedside tools such as airway-occlusion pressure (P0.1) and whole-breath occlusion pressure (POCC) can identify patients at risk and guide adjustments in ventilatory support and sedation to achieve protective targets. This article reviews available monitoring techniques, the relationship between drive and patient–ventilator interaction, and clinical applications for optimizing respiratory effort.
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