Mechanical Power Versus Diaphragmatic Excursion As a Predictor for Weaning in Chronic Obstructive Pulmonary Disease Patients

"Total respiratory rate (RR). Positive end-expiratory pressure (PEEP) (the external or applied PEEP) recorded, not the total PEEP, or intrinsic PEEP. The plateau pressure (Pplat) was measured during an inspiratory pause on the ventilator. Peak inspiratory pressure (Ppeak) should be obtained while the patient is relaxed, not coughing or moving in bed. MP was calculated according to Gattinoni's simplified mechanical power equation as follows (3,8):~MP(J/min)=0.098×VT×RR×(Ppeak-0.5×ΔP)."

Chest ultrasound to assess diaphragmatic excursion (DE(. M-mode was used to record the movement of the diaphragm during tidal breathing when the sampling line and diaphragm were as vertical as possible (not \< 70°). The data was measured from the first respiratory cycle at 0 min after SBT. The DE at 0 min, 5 min, and 30 min of SBT was respectively named as DE0, DE5, and DE30. The variation of right DE between each time point was named as ΔDE30-5 and ΔDE30-0. (7)