[Predictive value of the proportion of hibernating myocardium in total perfusion defect on reverse remodeling in patients with HFrEF underwent coronary artery bypass graft].

Objective: To evaluate the predictive value of the proportion of hibernating myocardium (HM) in total perfusion defect (TPD) on reverse left ventricle remodeling (RR) after coronary artery bypass graft (CABG) in patients with heart failure with reduced ejection fraction (HFrEF) by 99mTc-methoxyisobutylisonitrile (MIBI) single photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) combined with 18F-flurodeoxyglucose (FDG) gated myocardial imaging positron emission computed tomography (PET). Methods: Inpatients diagnosed with HFrEF at the Cardiac Surgery Center, Anzhen Hospital of Capital Medical University from January 2016 to January 2022 were prospectively recruited. MPI combined with 18F-FDG gated PET was performed before surgery for viability assessment and the patients received follow-up MPI and 18F-FDG gated PET at different stages (3-12 months) after surgery. Δ indicated changes (post-pre). Left ventricular end-systolic volume (ESV) reduced at least 10% was defined as RR, patients were divided into reverse remodeling (RR+) group and the non-reverse group (RR-). Binary logistic regression analysis was used to identify predictors of RR. Receiver operating characteristic (ROC) curve analysis was performed and the area under the curve (AUC) was calculated to assess the cut-off value for predicting RR. Additionally, we retrospectively enrolled inpatients with HFrEF at the Cardiac Surgery Center, Anzhen Hospital of Capital Medical University from January 2021 to January 2022 as the validation group, who underwent MPI and 18F-FDG gated PET before surgery. Echocardiography was performed before CABG and after CABG (3-12 months). In the validation group, the reliability of obtaining the cut-off value for the ROC curve was verified. Results: A total of 28 patients with HFrEF (26 males; age (56.9±8.7) years) were included in the prospective cohort. HM/TPD was significantly higher in the RR+ group than in the RR- group ((51.8%±17.9%) vs. (35.7%±13.9%), P=0.016). Binary logistic regression analysis revealed that HM/TPD was an independent predictor of RR (Odds ratio=1.073, 95% Confidence interval: 1.005-1.145, P=0.035). ROC curve analysis revealed that HM/TPD=38.3% yielded the highest sensitivity, specificity, and accuracy (all 75%) for predicting RR and the AUC was 0.786 (P=0.011). Meanwhile, a total of 100 patients with HFrEF (90 males; age (59.7±9.6) years) were included in the validation group. In the validation group, HM/TPD=38.3% predicted RR in HFrEF patients after CABG with the highest sensitivity, specificity and accuracy (82%, 60% and 73% respectively). Compared with the HFrEF patients in the HM/TPD<38.3% group (n=36), RR and cardiac function improved more significantly in the HM/TPD≥38.3% group (n=64) (all P<0.05). Conclusions: Preoperative HM/TPD ratio is an independent factor for predicting RR in patients with HFrEF after CABG, and HM/TPD≥38.3% can accurately predict RR and the improvement of cardiac function after CABG.目的： 采用心肌灌注显像联合门控心肌代谢显像探讨冬眠心肌（HM）占心肌总灌注受损范围（TPD）的比例（HM/TPD）预测射血分数降低型心力衰竭（HFrEF）患者冠状动脉旁路移植术（CABG）后逆转心室重构（RR）的价值。 方法： 前瞻性纳入2016年 1月至 2022年1月在首都医科大学附属北京安贞医院心脏外科中心诊断为HFrEF的住院患者，手术前、后行锝-99m-甲氧基异丁基异腈（99mTc-MIBI）单光子发射型计算机断层扫描（SPECT）心肌灌注显像联合氟-18-脱氧葡萄糖（18F-FDG）正电子发射型计算机断层扫描（PET）门控心肌代谢显像，术后3~12个月复查心肌灌注和代谢显像。Δ表示变化值（术后-术前）。根据术后左心室收缩末期容积（ESV）减少 10%及以上认为发生RR，将患者分成逆转组（RR+）和未逆转组（RR-）。采用回归分析预测RR的影响因素，构建受试者工作特征（ROC）曲线及计算曲线下面积预测术后RR的界值。回顾性收集2021年1月至2022年1月于首都医科大学附属北京安贞医院心脏外科中心诊断为HFrEF并在术前行心肌灌注和代谢显像的住院患者作为验证组，术前和术后3~12个月均行超声心动图。在验证组中，验证ROC曲线获得界值的可靠性。 结果： 前瞻性队列纳入28例HFrEF患者，年龄为（56.9±8.7）岁，其中男性26例。RR+组（n=16）术前HM/TPD明显高于RR-组（n=12）［（51.8%±17.9%）比（35.7%±13.9%），P=0.016）］。Logistic回归分析示，术前HM/TPD是预测CABG术后RR的唯一独立影响因素［比值比（OR）=1.073，95%CI：1.005~1.145，P=0.035］。ROC曲线示，预测术后RR指标的HM/TPD界值为38.3%，AUC为0.786（P=0.011），其灵敏度、特异度及准确性均为75%。回顾性纳入100 例HFrEF患者作为验证组，年龄为（59.7±9.6）岁，其中男性90例。在验证组中，HM/TPD预测HFrEF患者CABG术后RR的灵敏度为82%，特异度为60%，准确性为73%。与HM/TPD<38.3%的患者（n=36）比较，HM/TPD≥38.3%的患者（n=64）术后RR及心功能改善更明显（均P<0.05）。 结论： 术前HM/TPD是预测HFrEF患者CABG术后RR的独立影响因素，HM/TPD≥38.3%可较准确地预测CABG术后心室重构的逆转和心功能的改善。.