Comparative study of continuous intercostal nerve block and epidural anesthesia for postoperative analgesia in thoracotomy. The main reasons for the less effective analgesia are: the anterior branch of the intercostal nerve and the traffic branch to the contralateral chest wall, so the selection of the anterolateral incision pain - human transmission cannot be completely blocked; ② there is incomplete local accumulation of drugs on the parietal pleura. Considering preoperative pleural adhesions, surgery may undermine the integrity of the parietal pleura or select the anterolateral incision, patients should use CEA (Continuous Epidural Analgesia). In the South China National Defense Medical Journal in 2005, it was reported that the side effects of CINB (Continuous Intercostal Nerve Block) analgesia were significantly less than those of CEA. Due to serious complications from CEA, mainly respiratory inhibition: thoracic CEA's blocking effect on the intercostal muscle and intraoperative muscle relaxants affects diaphragmatic movement, hindering the recovery of pulmonary function. In this study, group A showed higher PCO2 indicators than group B at each period from 4 to 24 hours after surgery, indicating to some extent the inhibition of early postoperative ventilatory function by CEA. Due to individual differences in sex and drug dosage, the incidence of respiratory inhibition in CEA varies considerably, with reports ranging from 0.9% [6J to 13.5% [’J]. Additionally, CEA easily forms bilateral sympathetic blocks, resulting in bradycardia or hypotension and other hemodynamic changes, especially in elderly patients. Due to nerve dysfunction and decreased sympathetic nerve activity, these patients are more likely to experience larger fluctuations in heart rate and blood pressure. Although the incidence of these complications has declined in recent years due to the continuous improvement of CEA blocking drugs, finding the balance point between the optimal drug dosage and analgesic effect for individual patients remains very difficult and unpredictable, with potential dangers often being life-threatening. Therefore, for elderly patients with poor cardiac and pulmonary function, using CEA analgesia during the early postoperative period requires particularly careful management. Elderly patients receiving CINB analgesia can significantly reduce respiratory and circulatory complications, protect postoperative cardiopulmonary function, and alleviate the pressure of postoperative care. Compared to traditional analgesic methods, both CEA and CINB have excellent analgesic effects that meet the requirements of post-thoracotomy analgesia. Given equal analgesic efficacy, CINB offers greater security.