The measurement of pre-block
Diaphragmatic movement reduction, diaphragmatic movement reduction
All patients had routine fasting and no drinking before operation, no preoperative medication, and no oxygen was given. After entering the anesthesia preparation room, we open peripheral veins and connect BP, ECG, and SpOPatients took sitting position and tested the lung function with a spirometer (HI-101, CHEST, Tokyo, Japan). The patient’s lung function indicators [Forced vital capacity (FVC), forced expiratory volume in 1 s (FEVThe patients were placed in a supine position, using an ultrasound diagnostic apparatus and a 3–5 MHZ frequency convex array probe to measure the diaphragm mobility of the patients in the calm breathing position and the deep breathing position, respectively. Two-dimensional ultrasound mode was selected to place the probe between the midclavicular line and the anterior axillary line of the lower edge of the ipsilateral costal arch. On the basis of the liver or spleen being the acoustic window, an image of the diaphragm appeared as a hyperechoic band between the chest and abdomen. We adjusted the probe angle so that the sound beam was perpendicular to the movement direction of the diaphragm. The posterior 1/3 of the diaphragm was imaged. When the image was stable, we switched to M-mode ultrasound. The measurement standard was that the sampling line was perpendicular to the diaphragm muscle line and stable waveforms appeared [The diaphragmatic movement reduction recorded in the two groups could be defined as not paralyzed, partially paralyzed, or completely paralyzed. Diaphragmatic movement reduction of less than 25% represented not paralyzed. Partially paralyzed was defined as a diaphragmatic movement reduction between 25% and 75%. Diaphragmatic movement reduction of more than 75% was seen as completely paralyzed [