Ultrasound measurement
An ultrasound doctor with more than 5 years of experience performed the Ultrasound (US) evaluation at the first day of MV and 3rd, 7rd day of intervention and the day discharged from ICU with a Mindray TE-5 machine (Shenzhen Mindray Bio-Medical Electronics Co. Ltd. Shenzen, China).Diaphragm US: The diaphragm was evaluated by ultrasound in all patients [