A ventilator can be likened to which of the following devices?

A ventilator can be likened to a manual resuscitator because both devices are used to support or replace the patient's breathing when they are unable to do so effectively on their own. A manual resuscitator, often referred to as a Bag-Valve-Mask (BVM), allows a healthcare provider to deliver positive pressure ventilation by squeezing the bag, which forces air into the lungs of the patient.

Similarly, a ventilator automatically delivers breaths to the patient, providing controlled ventilation that adjusts parameters such as tidal volume, rate, and pressure based on the patient's needs. Both devices are critical in managing airway and respiratory failure, ensuring adequate oxygenation and ventilation when spontaneous breathing is inadequate.

The other options, while related to respiratory care, serve different functions. An oxygen concentrator focuses on providing supplemental oxygen rather than mechanically assisting with ventilation. A nebulizer delivers medication in aerosol form but does not enhance or control the patient's breathing effort. A CPAP machine provides continuous positive airway pressure to help keep the airways open, mainly used for obstructive sleep apnea, but does not provide full ventilatory support as a ventilator does.