[Early outcomes of thoracoscopic trans-mitral myectomy in obstructive hypertrophic cardiomyopathy patients with left midventricular obstruction].

Objective: To examine the early effect of thoracoscopic trans-mitral myectomy for hypertrophic cardiomyopathy patients with left midventricular obstruction. Methods: From April 2020 to July 2021, 10 hypertrophic cardiomyopathy patients with left midventricular obstruction underwent thoracoscopic trans-mitral myectomy at Guangdong Provincial People's Hospital. The whole group of patients consisted of 7 males and 3 females aged (52.0±16.4) years (range: 18 to 68 years). The EuroSCORE Ⅱ predicted mortality rate was 1.78% (1.20%) (M(IQR)) (range: 0.96% to 4.86%). The clinical data were collected and analyzed retrospectively to evaluate the clinical efficacy by comparing preoperative and postoperative echocardiographic parameters using paired t-test, paired Wilcoxon test or Fisher exact test, including left ventricular outflow tract peak pressure gradient, maximum interventricular septum thickness, systolic anterior motion of the anterior mitral leaflet and so on. The safety was determined by summarizing the incidence of perioperative and follow-up complications. Results: All the procedures successed with no conversion to median sternotomy, septal defect, ventricular rupture. There was no in-hospital 30-day death, neither serious complications like permanent pacemaker implantation, re-sternotomy for bleeding, low cardiac output syndrome, stroke, or multiple organ dysfunction syndrome. The left ventricular outflow tract obstruction was effectively relieved in all patients expect a patient developed residual obstruction. Compared with that of pre-operation, the thickness of the interventricular septum was significantly reduced from (22.1±4.0) mm to (10.3±1.7) mm (t=10.693, P<0.01), while the left ventricular outflow tract peak pressure gradient was significantly reduced from (81.7±21.1) mmHg to 12.3 (11.5) mmHg (Z=-2.805, P<0.01) (1 mmHg=0.133 kPa). Conclusion: Thoracoscopic trans-mitral myectomy is an effective and safe procedure for hypertrophic cardiomyopathy patients with left midventricular obstruction.目的： 探讨胸腔镜经二尖瓣室间隔心肌切除术治疗左心室中部梗阻的肥厚型心肌病的早期手术效果。 方法： 回顾性收集2020年4月至2021年7月在广东省人民医院心外科接受胸腔镜经二尖瓣室间隔心肌切除术治疗的10例左心室中部梗阻的肥厚型心肌病患者的临床资料，男性7例，女性3例，年龄（52.0±16.4）岁（范围：18~68岁），欧洲心血管手术危险因素评分系统Ⅱ预测手术病死率［M（IQR）］为1.78%（1.20%）（范围：0.96%~4.86%）。采用配对t检验、配对Wilcoxon检验或Fisher确切概率法比较手术前后左心室流出道峰值压差、室间隔最大厚度、二尖瓣前叶收缩期前向运动等超声心动图指标，记录围手术期和随访期间的并发症发生情况。 结果： 全组患者均成功完成手术，无中转正中开胸、无室间隔穿孔或心脏破裂。全组患者无围手术期死亡，未发生永久性起搏器植入、再次开胸止血、低心排血量综合征、卒中和多器官功能障碍综合征等严重并发症。与术前相比，术后室间隔厚度减小［（10.3±1.7）mm比（22.1±4.0）mm，t=-10.693，P<0.01］，左心室流出道压差峰值降低［12.3（11.5）mmHg比（81.7±21.1）mmHg，Z=-2.805，P<0.01；1 mmHg=0.133 kPa］，有效解除了左心室流出道梗阻。 结论： 胸腔镜经二尖瓣室间隔心肌切除术治疗左心室中部梗阻的肥厚型心肌病可获得较好的早期效果。.