Background: This study aimed to determine the incidence of symptomatic myocardial ischemia (PSMI) after posterior decompressive surgery for degenerative lumbar disorders and identify its risk factors. Methods: 256 patients who underwent the posterior decompressive surgery and were discharged from the hospital between January 2011 and December 2016 were enrolled in this study, according to the inclusion and exclusion criteria. Subjects were divided into two groups by the occurrence of PSMI: the PSMI group and the N-PSMI group. Three sets of factors were analyzed to investigate potential risk factors for PSMI. Patient characteristics included age, gender, body mass index, smoking, drinking, venous thrombosis of lower extremities, comorbidities, visual analog scale, hemoglobin, electrolytes. Preoperative cardiac functional variables included electrocardiogram, ventricular ejection fraction, history of ischemic attack, previous cardiac surgery. Perioperative variables included surgical strategy, surgery time, blood loss, intraoperative aortic injury, intraoperative maximum heart rate, arterial blood pressure, postoperative temperature, daily liquid intake and output volume, electrolytes glucose, drug allergy, and postoperative visual analog scale. Univariate analyses followed by the multivariate logistic regression model were employed to identify the risk factors for PSMI. Results: PSMI was developed in 23 of 256 patients (8.9%) before discharge. Univariate analyses revealed that patients with onset of PSMI were older, more likely to have undergone cardiac surgery, with less daily liquid intake volume, and less intravenous infusion (p < 0.05). Logistic regression analysis revealed that age > 52 years, heart rate > 81 Bpm, daily liquid intake < 2140 mL, and cardiac surgery history were independently associated with PSMI after posterior decompressive surgery for degenerative lumbar disorders.Conclusions: The incidence of PSMI after posterior decompressive surgery for degenerative lumbar disorders was 8.9%; senior, fast heart rate, insufficient daily liquid intake, and cardiac surgery history are potential risk factors and should be carefully evaluated before an operation.