Pulmonary function indices including respiratory rate (RR), tidal volume (Vt), vital capacity (Vc) and pulse oximetry (SpO_2) were recorded before operation and on the first 2 days after operation.

• 测量术前及术后镇痛期间患者呼吸频率(RR)、潮气量(Vt)、肺活量(Vc)及脉搏氧饱和度(SpO2);