Continuous Cardiac Magnetic Resonance Imaging after Coronary Revascularization for Left Ventricular Dysfunction

Objective: To determine the contribution of serial cardiac magnetic resonance imaging (MRI) following coronary revascularization (CR) to the clinical management of patients with left ventricular insufficiency. Methods: The study objects comprised the clinical data of 145 patients with CR undergoing CR surgery for left ventricular insufficiency in our hospital from January 2021 to January 2023. The patients were divided into the case (n = 35, left ventricular ejection fraction (LVEF) <50%) and control (n = 110, LVEF ≥50%) groups based on the LVEF recorded in the medical record system 6 months after surgery. Preoperative LVEF left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV), left ventricular end-diastolic volume index (LVEDVI), left ventricular end-systolic volume index (LVESVI), cardiac index (CI), and other cardiac magnetic resonance detection parameters were compared. Logistic regression analysis was performed to analyze the prognostic factors of patients undergoing CR after CR surgery for left ventricular insufficiency. The receiver operating characteristic curve was drawn, the sensitivity, specificity, and area under curve (AUC) were calculated, and the best prediction threshold was determined. The prognostic value of cardiac MRI in CR surgery for left ventricular dysfunction was observed. Results: Cardiac MRI revealed that the case group had higher LVEDV, LVESV, LVEDVI, LVESVI, and CI than the control group. However, the LVEF index was lower than that in the control group (p < 0.05). Logistic regression analysis was conducted for indicators with differences, and the results indicate LVEF as a protective factor for the postoperative efficacy of the patients, with an odds ratio (OR) <1. LVEDV, LVESV, LVEDVI, LVESVI, and CI were all risk factors for the postoperative efficacy of the patients, with an OR >1. The AUC values of LVEF, LVEDV, LVESV, LVEDVI, LVESVI, and CI were 0.698, 0.674, 0.654, 0.700, 0.572, and 0.812, respectively. The optimal threshold values were 53.57%, 112.33 and 68.5 mL, and 205.51, 163.99, and 2.14 L/m2, and their corresponding sensitivities reached 0.618, 0.514, 0.654, 0.800, 0.371, and 0.829 for each index. The specificities were 0.800, 0.836, 0.771, 0.609, 0.836, and 0.645, which indicate that LVEF, LVEDV, LVESV, LVEDVI, LVESVI, and CI had a certain degree of predictive value for postoperative cardiac function recovery. Conclusion: LVEDV, LVESV, LVEDVI, LVESVI, CI, and LVEF are all factors affecting the clinical efficacy in patients undergoing CR after left ventricular insufficiency. In addition, cardiac MRI can effectively detect the above factors and effectively predict the postoperative efficacy among patients.