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Common procedures used to evaluate the respiratory muscles are maximum inspiratory pressure and maximum expiratory pressure. However, there is little consensus concerning these methods.ommon procedures used to evaluate the respiratory muscles are maximum inspiratory pressure and maximum expiratory pressure. However, there is little consensus concerning these methods.
Tidal volume and respiratory rate are commonly used to set pressure-support ventilation. A reasonable level of inspiratory effort is an inspiratory pressure-time product (PTP) < 125 cmH2O.sec/minute. Pressure time product could be measured using the simultaneous recording of flow, volume and esophageal pressure.