Noninvasive ventilation (NIV) refers to the administration of ventilatory support without using an invasive artificial airway (endotracheal tube or tracheostomy tube). The use of noninvasive ventilation has markedly increased over the past two decades, and noninvasive ventilation has now become an integral tool in the management of both acute and chronic respiratory failure, in both the home setting and in the critical care unit.
The key to the successful application of noninvasive ventilation is in recognizing its capabilities and limitations. This also requires identification of the appropriate patient for the application of noninvasive ventilation (NIV). Patient selection is crucial for the successful application of noninvasive ventilation.

Suitable clinical conditions for noninvasive ventilation (most patients)
Chronic obstructive pulmonary disease
Cardiogenic pulmonary edema

Absolute contraindications are
    * Coma
    * Cardiac arrest
    * Respiratory arrest
    * Any condition requiring immediate intubation

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