Lung cancer remains the world's leading cancer in terms of morbidity and mortality, with more than 20 million new cases and 9.7 million deaths annually. Despite improvements in surgical techniques and medical care, the number of elderly people undergoing surgery is gradually increasing, so there are an increasing number of complications following lung resection. Postoperative cerebral infarction is a relatively rare but devastating complication that places a heavy burden on patients and families. The incidence of postoperative cerebral infarction in patients after thoracic surgery has been reported to be 0.6-1.1%. There is a risk of postoperative cerebral infarction after lung cancer surgery, and the results of a few studies have shown that postoperative cerebral infarction is related to old age, male, hypertension, hyperlipidemia, and lobectomy factors, but the pathogenesis of the occurrence of cerebral infarction has not been clearly proved for the time being, and so these risk factors cannot be taken as the direct cause of cerebral infarction. Therefore, we need to further explore the factors leading to cerebral infarction after lung cancer surgery. If we can further prove that some of the risk factors are related to the causes of cerebral infarction after lung cancer surgery, we can make corresponding strategies in the perioperative period to improve the safety of surgery and reduce the incidence of cerebral infarction in the postoperative period.

Inclusion Criteria:

Postoperative cerebral infarction

Exclusion Criteria:

No postoperative infarction

1. patients with postoperative cerebral infarction in the hospital during the same period of time as the case group
2. hospitalised surgical patients in the same period as the control group.
3. patients who underwent pneumonectomy for lung nodules as the reason for surgery.