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find Author "张中明" 2 results
  • 常温缺血预处理对幼兔未成熟心肌的保护作用

    目的 研究常温缺血预处理(IP)对幼兔未成熟心肌的保护作用。方法 将24只幼兔分为四组。组1:IP 1次;组2:IP 2次;组3:IP 3次;对照组。应用Langendorff心脏灌注方法,对3~4周龄幼兔离体心脏实施不同次数的5分钟缺血、5分钟再灌注的常温IP,常温缺血45分钟,再灌注30分钟。于平衡灌注末、缺血前、再灌注3分钟、5分钟、10分钟、20分钟和30分钟分别测定左心室发展压(LVDP)、左心室最大上升及下降速率(±dp/dt max),再灌注末测定心肌组织三磷酸腺苷(ATP)含量、丙二醛(MDA)含量和超氧化物歧化酶(SOD)活性。结果 再灌注30分钟时,组1和组2 LVDP、+dp/dt max恢复率显著高于对照组(Plt;0.05,Plt; 0.01),组3 LVDP、±dp/dt max的恢复率与对照组比较差别无显著性意义。再灌注末组1、组2和组3心肌ATP含量显著高于对照组(Plt;0.05)。组2 MDA含量显著低于组1、组3和对照组(Plt;0.05)。结论 IP对未成熟心肌具有保护作用,其中2次IP的保护作用最好,而3次的保护作用减弱,表明IP对未成熟心肌的保护作用具有饱和效应和累计现象。

    Release date:2016-08-30 06:34 Export PDF Favorites Scan
  • Perioperative Management of Elderly Patients Undergoing Heart Valve Replacement

    ObjectiveTo investigate clinical outcomes and summarize perioperative management experience of heart valve replacement (HVR)in elderly patients. MethodsWe retrospectively analyzed clinical data of 47 elderly patients undergoing HVR in Affiliated Hospital of Xuzhou Medical College from January 2011 to May 2014. There were 19 male and 28 female patients with their age of 60-79 years. There were 35 patients with rheumatic heart disease, 10 patients with degenerative valvular disease, and 2 patients with congenital bicuspid aortic valve. Preoperatively, there were 23 patients in NYHA functional class Ⅱ, 19 patients in class Ⅲ, and 5 patients in class Ⅳ. All the patients received HVR under cardiopulmonary bypass (CPB), and some patients received concomitant tricuspid valvuloplasty (TVP), left atrial thrombectomy or coronary artery bypass grafting (CABG). Postoperative mortality, morbidity and heart function improvement were evaluated. ResultsTwenty-seven patients received mitral valve replacement (MVR), 15 patients received aortic valve replacement (AVR), and 5 patients received MVR+AVR. Concomitantly, 4 patients received TVP, 3 patients received left atrial thrombectomy, and 6 patients received CABG. Operation time was 138-412 (196±52)minutes, CPB time was 48-301 (108±33)minutes, aortic cross-clamping time was 34-196 (87±21)minutes, and length of hospital stay was 12-31 (19±5)days. There was no intraoperative death, and 2 patients (4.3%)died postoperatively because of left ventricular failure and multiple organ dysfunction syndrome respectively. Twenty-three patients (51.1%)had postoperative complications including respiratory failure in 6 patients, pulmonary infection in 5 patients, arrhythmias in 5 patients, wound infection in 2 patients, pleural effusion in 2 patients, low cardiac output syndrome in 2 patients, and acute renal failure in 1 patient. Forty-five survival patients were followed up by telephone, online video and at the outpatient department for 1-32 months, and follow-up rate was 100%. There were 11 patients in NYHA functional classⅠ, 32 patients in class Ⅱ, and 2 patients in class Ⅲ. ConclusionAccording to clinical characteristics of elderly patients with valvular heart disease, meticulous surgical techniques and perioperative management can effectively reduce mortality and morbidity after HVR.

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