To ventilate a patient means to use a mechanical ventilator to deliver breaths to a patient who cannot breathe adequately for themselves, or to support a patient whose own breathing effort is insufficient to maintain safe oxygen and carbon dioxide levels.
Mechanical ventilation is indicated when a patient is unconscious, has respiratory failure, has been anaesthetised for surgery, or cannot maintain adequate airway protection. After cardiac arrest, patients who remain unconscious following resuscitation are routinely intubated and connected to a mechanical ventilator in the intensive care unit. The ventilator controls or assists the rate and volume of each breath, delivering oxygen and removing carbon dioxide. Settings are adjusted by the critical care team based on blood gas measurements.
During targeted temperature management (therapeutic cooling) after cardiac arrest, ventilation is carefully adjusted to maintain normal oxygen and carbon dioxide levels, as both hypoxia and hypocapnia (low CO2) can harm the injured brain. The cooling process itself affects metabolism and the patient’s carbon dioxide production, requiring frequent reassessment of ventilator settings.
Patients are weaned from ventilation as they recover: sedation is gradually reduced, their own respiratory effort increases, and when they can breathe independently and maintain a safe airway, the endotracheal tube is removed (extubation). Most families find seeing a loved one on a ventilator distressing; the clinical team will explain why it is needed and what the plan is for weaning.
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