6 Common modes of ventilator

There are 6 mechanical ventilation modes of ventilator:

IPPV: Zero pressure in expiratory phase and positive pressure in inspiratory phase. It is usually used clinically in patients with COPD and other respiratory failure.

IPNPV: inspiratory phase is positive pressure, expiratory phase is negative pressure. Clinical application of negative expiratory phase pressure can cause alveolar collapse and iatrogenic atatasis.

CPAP: When patients breathe on their own, a certain amount of artificial positive pressure is applied to the airway throughout the breathing cycle.

IMV: Without synchronization device, ventilator air supply does not need to be triggered by spontaneous breathing of the patient, and the air supply time is not constant in each breathing cycle.

SIMV: A synchronous device in which the ventilator gives instructions to the patient to breathe every minute according to the predesigned respiratory parameters, and the patient can breathe independently without the influence of the ventilator. It is usually used offline. When R5 times/hour is still maintained in a good oxygenation state, it can be considered offline, and PSV is generally added to avoid respiratory muscle fatigue.

MMV: When spontaneous breathing > preset minute ventilation, the ventilator does not command ventilation, but only provides continuous positive pressure. When preset minute ventilation, the ventilator performs command ventilation and increases minute ventilation to reach the preset level.

PSV: Under the premise of autonomous breathing, each inhalation is supported by a certain level of pressure to increase the depth and volume of inspiration of the patient. It is often used for SIMV+PSV: it is used for preparation before offline, which can reduce respiratory work and oxygen consumption.