mechanical ventilation

Normally we breathe in by expanding the chest, which sucks air into the lungs. A ventilator works the opposite way: it gently blows air in under positive pressure, inflating the lungs from the inside. Mechanical ventilation is the use of such a machine to support or completely take over a person's breathing when their own efforts are failing or have been deliberately stopped with drugs.

The ventilator connects through a breathing tube (after intubation or a tracheostomy) and is programmed with settings the team tailors to the patient: how big each breath is (tidal volume), how often breaths are delivered, how much oxygen the gas contains, and how much pressure is held at the end of expiration to keep air sacs open. Modes range from fully controlled breaths, where the machine does all the work, to supported modes where it merely assists each breath the patient triggers.

Mechanical ventilation buys time — it does not cure the underlying illness, but it keeps gas exchange going while pneumonia, ARDS, a drug overdose, or surgery is dealt with. An honest caveat: the very pressure and volume that sustain life can also injure fragile lungs if set too aggressively, and prolonged ventilation brings risks of infection and muscle weakness. This is why careful, lung-protective settings and a plan to wean as early as safely possible are central to good care.