Without considering the site and extent of surgery, the pulmonary function indexes that can be operated on are: ① Spirometry (VC) >50% of the predicted value. ② Exertional expiratory volume in one second (FEV1) >40% of the predicted value and FEV1/FVC (exertional lung capacity) >50%. (iii) Residual volume of air (RV)/Total lung capacity (TCL) <40% of the predicted value. ④Diffusion rate of carbon monoxide (DLCO) >50% of the expected value.
1. Preoperative pulmonary function tests are required for age >70 years, history of smoking and lung disease, obese patients, and thoracic and upper abdominal surgery. Preoperative FEV1 and DLCO >80% of predicted value, postoperative FEV1 (PPO-FEV1) and postoperative DLCO (PPO-DLCO) >60% of predicted value, maximal ventilation (MVV) >70% of predicted value, FEV1 >2L (total pneumonectomy), FEV1 >1.6L (lobectomy) do not need to be further evaluated.
2. Disregarding the consideration of the surgical site and surgical scope, the indicators of preoperative pulmonary function are: ① VC>50% of the expected value. ② FEV1 >40% of the expected value and FEV1/FVC >50%. (iii) RV/TCL <40% of the expected value. (iv) DLCO >50% of the predicted value.
3. Preoperative lung function indexes for long-term survival after lobectomy: ① FEV1＞50%. ② PPO-DLCO＞40% of the expected value. ③PaCO2<50mmHg. ④MVV＞40% of the expected value. ⑤ FEV1＞1.6L.
4. Preoperative lung function indexes for long-term survival after total lung resection on one side: ① FVC＞80% of the expected value. ②MVV＞65% of the expected value. ②MVV＞65% of the expected value. ③Ascending to the 5th floor in one breath (ascending to the 3rd floor suggests that FEV1＞1.7L, and ascending to the 5th floor suggests that FEV1＞2L). ④ FEV1＞2L.
How many lung function indexes can be operated is recommended for further consultation at the hospital.