目的 分析心脏手术相关医疗纠纷的临床及法医学特点，并就发生原因进行剖析及提出相应防范措施。 方法 对2002年1月－2011年12月四川华西法医学鉴定中心受理的四川省各级医疗机构发生的17例与心脏手术相关的医疗纠纷法医学鉴定资料进行回顾性分析。 结果 17例心脏手术相关医疗纠纷中，12例进行了尸体解剖死因鉴定，死亡原因有心脏传导系统出血，术后感染，低心排量综合症、肺动脉高压、失血性休克致死等。其余5例加上尸体解剖2例在内共7例进行了医疗过错鉴定，存在的医疗过错包括术前检查不完善，告知不充分，手术操作不细致，术后观察、处理不足，医疗记录不完整等。 结论 心脏手术相关医疗纠纷与术后并发症关系密切，医护人员应重视对心脏术后并发症的防治。尸体解剖对解决心脏术后死亡引起的医疗纠纷具有重要意义。
目的 分析骨科医疗纠纷的原因及特点，为医疗纠纷的防范提供参考。 方法 收集2010年1月－2011年12月四川华西法医学鉴定中心涉及四川省各级医疗机构的骨科医疗纠纷鉴定案例55例，进行回顾性分析。 结果 55例骨科医疗纠纷中2010年25例，2011年30例；医源性医疗纠纷41例（74.5%），非医源性医疗纠纷14例（25.5%）。医源性医疗纠纷中医疗机构存在的问题主要以手术操作不当及失误为主（15例，占27.3%），其次为医患沟通不到位（8例，占14.5%）。 结论 骨科医疗纠纷防范的关键在于医务人员认真履行其诊疗义务。
Objective To establish a personalized Stanford type B aortic dissection numerical simulation model, and using computational fluid dynamics (CFD) numerical simulation to obtain the hemodynamic behavior and law of the type B aortic dissection at different stages of development. Methods Based on the theory of three-dimensional model reconstruction, we used CT images of a patient with type B aortic dissection in the Xiamen Cardiovascular Hospital of Xiamen University, relevant medical image processing software to reconstruct a personalized aortic three-dimensional model, and CFD to reconstruct the model which was simulated in fluid mechanics. Results The three-dimensional reconstruction model could intuitively observe the changing trend of the false cavity at different stages of the dissection development. Through fluid mechanics simulation, the blood flow rate, pressure, wall shear stress, vascular wall Von Mises stress and other parameters at different stages of the dissection development were obtained. Conclusion The hemodynamic behavior and law of relevant parameters in the development stage of aortic dissection are analyzed. The combination of the values of relevant parameters and clinical medical detection and diagnosis can well predict the development of the disease, and finally provide more theories and methods for the scientific diagnosis of aortic dissection.
Objective To analyze the risk factors for ventilator-associated pneumonia( VAP) in adult patients undergoing cardiac surgery with cardiopulmonary bypass ( CPB) . Methods A total of 127 consecutive adult patients who received postoperative ventilation for more than 48 hours between January 2002 and June 2008 in the cardiac surgical intensive care unit( CSICU) were included in this study. The patients were assigned into a VAPgroup( n =64) and a control group( n = 63) . Pre-, intra-, and postoperative factors were collected and analyzed between two groups, and the multivariate analysis( logistic regression)were used to identify the risk factors of VAP. Results The overall incidence of VAP was 5.1%. The mortality of VAP was 28. 1% . Compared to the control group, the patients in the VAP group had longer duration of cardiopulmonary bypass time, ventilation time, more blood products usage and the duration of stay in CSICU( P lt; 0. 001) , higher morbidity of low cardiac output syndrome and tracheotomy( P lt; 0. 01) and higher rate of aortic surgery and mortality( P lt; 0. 05) . The preoperative left ventricular ejection fraction ( LVEF) and postoperative oxygenation index( PaO2 /FiO2 ) were lower in the VAP group than those of the control group( P lt; 0. 001) . Five variables were found to be significantly related to the development of VAP by multivariate analysis: CPB time gt; 120 min( OR = 6. 352, P = 0. 000) ; PaO2 /FiO2 lt; 300 mm Hg( OR =3. 642, P = 0. 017) , transfusion of blood products ≥1500 mL( OR = 5. 083, P = 0. 039) , ventilation time≥5 days( OR = 9. 074, P = 0. 047) and tracheotomy( OR = 19. 899, P = 0. 021) . A total of 102 pathogens were obtained by sputum culture in 64 VAP patients. There were 62( 60. 8% ) cases of gram negative bacilli, 19 cases( 18. 6% ) of gram positive cocci and 21( 20. 6% ) cases of eumycetes. Conclusion This study shows that the cardiopulmonary bypass time, ventilation time, hypoxemia, blood products transfusion and tracheotomy are risk factors most likely associated with VAP development.