Question

Describe three modes of ventilation and difference between them?

Answer 1

A mechanical ventilator may be required for a variety of reasons, to control the patient's respiration during surgery or during treatment of severe head injury to oxygenate the blood when the patient's ventilatory efforts are inadequate, and to rest the respiratory muscles among others.

A mechanical ventilator is a positive or negative pressure breathing device that can maintain ventilation and oxygen delivery for a prolonged period of time.

Ventilators mode

It is referred that how breaths are delivered to the patient, the commonly used modes are assisted - control, intermittent mandatory ventilation, synchronized intermittent mandatory ventilation, pressure support ventilation and airway pressure release ventilation.

These are the differences between three of the modes.

1. Assisted control ventilation.

It provides full ventilatory support by delivering a preset tidal volume and respiratory rate if a patient starts breathing between machine breath then the ventilator delivers the assisted volume to the patient, therefore every breath is preset.

2. Intermittent mandatory ventilation.

(IMV)

It provides a combination of mechanically assisted breath and spontaneous breaths .mechanical breaths are delivered at present intervals and a preselected tidal volume, regardless of the patient' s efforts. Although the patient can start his own breath between mechanical ventilator, these spontaneous breaths are limited to the rural volume generated by the patient. Intermittent mandatory ventilation provides allows the client to use his own respiratory muscles to avoid muscle atrophy, however, it may increase breath.

3. Synchronized intermittent mandatory ventilation.

It also delivers a preset tidal volume and number of breaths per minute. Between ventilator - delivered breath the patient can breathe spontaneously with no assistance from the ventilator on those extra breaths because of the ventilator senses patient's breathing efforts and doesn't initiate breathing in opposition to patients breathing efforts, efforts put by the ventilator is reduced.

There is another type of ventilation is present such as

pressure support ventilation in which pressure is being applied to the airway throughout the patient -triggered inspiration to decrease resistance within the tracheal tube and ventilator tubing.

And also Airway pressure release ventilation.

It is a time-triggered, pressure limited, time cycled, mode of mechanical ventilation that allows unrestricted, spontaneous breathing throughout the ventilatory cycle.