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Maximal inspiratory pressure (MIP), also known as negative inspiratory force (NIF), is the maximum pressure that can be generated against an occluded (closed or obstructed) airway beginning at functional residual capacity (the volume of air present in the lungs at the end of passive expiration).
Maximum inspiratory pressure is an important and noninvasive index of diaphragm strength and an independent tool for diagnosing many illnesses. [29] Typical maximum inspiratory pressures in adult males can be estimated from the equation, M IP = 142 - (1.03 x Age) cmH 2 O, where age is in years.
Boehringer Inspiratory Force Meters with memory have been used in predicting the efficacy of neonate extubation [7] and identifying the number of maneuvers required to accurately measure maximal inspiratory mouth pressure in patients with chronic airflow obstruction. [8]
Measurement of maximal inspiratory and expiratory pressures is indicated whenever there is an unexplained decrease in vital capacity or respiratory muscle weakness is suspected clinically. Maximal inspiratory pressure (MIP) is the maximal pressure that can be produced by the patient trying to inhale through a blocked mouthpiece.
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