What is the purpose of mechanical ventilation?

• A. To monitor brain activity.
• B. To assist or replace spontaneous breathing in patients unable to breathe adequately.
• C. To treat kidney failure.
• D. To correct electrolyte disturbances.

Answer: (B)

Mechanical ventilation is used to support or fully take over breathing when a patient cannot maintain adequate ventilation on their own. It delivers breaths, controls the rate and tidal volume, and can adjust the inspired oxygen concentration and airway pressures to optimize gas exchange. This protects against fatigue, ensures sufficient oxygen delivery, and promotes proper removal of carbon dioxide during acute respiratory failure, during anesthesia, or when neuromuscular weakness impairs spontaneous breathing. The other options refer to different clinical tasks: monitoring brain activity, treating kidney failure, and correcting electrolyte disturbances. In short, its main purpose is to assist or replace spontaneous breathing when it isn’t enough.