maximum inspiratory pressure
Also written as: MIP — Maximum Inspiratory Pressure
Test measuring the strongest negative pressure a patient can generate during maximum inspiratory effort, assessing respiratory muscle strength.
Full Definition
Maximum inspiratory pressure (MIP) is a pulmonary function test that measures the greatest negative pressure a patient can generate during a maximum inspiratory effort against an occluded airway. Also known as negative inspiratory force (NIF), this test specifically evaluates the strength of the diaphragm and other inspiratory muscles. The patient breathes through a mouthpiece connected to a pressure manometer with the airway temporarily blocked. Normal MIP values are typically more negative than -80 cmH2O in healthy adults, with values less negative than -30 cmH2O indicating significant respiratory muscle weakness. This measurement is crucial for assessing ventilator dependence, predicting extubation success, and monitoring patients with neuromuscular diseases affecting respiratory function.
Usage
Usage note: Often abbreviated as MIP or NIF; distinguish from peak inspiratory pressure on ventilators.
In Context
- "The patient's maximum inspiratory pressure of -45 cmH2O indicated moderate respiratory muscle weakness." — Pulmonary function report
- "Serial MIP measurements showed improving respiratory muscle strength during the weaning process." — Ventilator weaning assessment