Quantitative evaluation of hand cranking a roller pump in a crisis management drill

The heart-lung machines for open-heart surgery have improved over the past 50 years; they rarely break down and are almost always equipped with backup batteries. The hand-cranking procedure only becomes necessary when a pump breaks down during perfusion or after the batteries have run out. In this study, the performance of hand cranking a roller pump was quantitatively assessed by an objective method using the ECCSIM-Lite educational simulator system. A roller pump connected to an extracorporeal circuit with an oxygenator and with gravity venous drainage was used. A flow sensor unit consisting of electromagnetic sensors was used to measure arterial and venous flow rates, and a built-in pressure sensor was used to measure the water level in the reservoir. A preliminary study of continuous cranking by a team of six people was conducted as a surprise drill. This system was then used at a perfusion seminar. At the seminar, 1-min hand-cranking drills were conducted by volunteers according to a prepared scenario. The data were calculated on site and trend graphs of individual performances were given to the participants as a handout. Preliminary studies showed that each person's performance was different. Results from 1-min drills showed that good performance was not related to the number of clinical cases experienced, years of practice, or experience in hand cranking. Hand cranking to maintain the target flow rate could be achieved without practice; however, manipulating the venous return clamp requires practice. While the necessity of performing hand cranking during perfusion due to pump failure is rare, we believe that it is beneficial for perfusionists and patients to include hand-cranking practice in periodic extracorporeal circulation crisis management drills because a drill allows perfusionists to mentally rehearse the procedures should such a crisis occur.     

Physics-Driven CFD Modeling of Complex Anatomical Cardiovascular Flows—A TCPC Case Study

Recent developments in medical image acquisition combined with the latest advancements in numerical methods for solving the Navier-Stokes equations have created unprecedented opportunities for developing simple and reliable computational fluid dynamics (CFD) tools for meeting patient-specific surgical planning objectives. However, for CFD to reach its full potential and gain the trust and confidence of medical practitioners, physics-driven numerical modeling is required. This study reports on the experience gained from an ongoing integrated CFD modeling effort aimed at developing an advanced numerical simulation tool capable of accurately predicting flow characteristics in an anatomically correct total cavopulmonary connection (TCPC). An anatomical intra-atrial TCPC model is reconstructed from a stack of magnetic resonance (MR) images acquired in vivo. An exact replica of the computational geometry was built using transparent rapid prototyping. Following the same approach as in earlier studies on idealized models, flow structures, pressure drops, and energy losses were assessed both numerically and experimentally, then compared. Numerical studies were performed with both a first-order accurate commercial software and a recently developed, second-order accurate, in-house flow solver. The commercial CFD model could, with reasonable accuracy, capture global flow quantities of interest such as control volume power losses and pressure drops and time-averaged flow patterns. However, for steady inflow conditions, both flow visualization experiments and particle image velocimetry (PIV) measurements revealed unsteady, complex, and highly 3D flow structures, which could not be captured by this numerical model with the available computational resources and additional modeling efforts that are described. Preliminary time-accurate computations with the in-house flow solver were shown to capture for the first time these complex flow features and yielded solutions in good agreement with the experimental observations. Flow fields obtained were similar for the studied total cardiac output range (1–3 l/min); however hydrodynamic power loss increased dramatically with increasing cardiac output, suggesting significant energy demand at exercise conditions. The simulation of cardiovascular flows poses a formidable challenge to even the most advanced CFD tools currently available. A successful prediction requires a two-pronged, physics-based approach, which integrates high-resolution CFD tools and high-resolution laboratory measurements.     

A computerized decision support system for patient selection in dental education

A computerized decision support system is presented. The system is used to aid in the situation of patient selection for the purpose of dental education and utilizes the PERT/CPM methodology and decision tables. It runs on a microcomputer and written in Basic. The input is a list of patient's needs, and the output is a tentative treatment plan, the chair time needed to complete the treatment, its cost, and the probability that the student will finish it on time.     

ECLIPS: An extended clinical laboratory information processing system

The clinical laboratory is regarded as a component of the medical care system extending from physician to laboratory staff and back to physician. From this concept a computer-based system of laboratory information is derived, emphasizing: (1) total laboratory responsibility for the test and its request, and (2) physician-oriented output reports.     

Patient safety unit for a hot-film anemometer,used for blood-velocity determination in humans

An inexpensive patient safety unit for a constant temperature hot-film anemometer is described. Both the so-called ‘electrical hazard’ and the thermal risk, which is special for the anemometer, have been eliminated.     

病历、电子病历与中医电子病历

本文从中医病历的历史演化，西医病历的发展过程出发，对中西医病历的特点进行了分析，并对电子病历及中医电子病历作了一些简单的介绍。     

1例用药错误事件的分析与改进

采用根本原因分析及行动法对1例儿科用药错误事件进行分析,确定根本原因,从人员、环境、制度等方面提出针对性改进措施。采取措施后,类似不良事件未再发生。建议医疗机构加强关键环节的有效沟通,鼓励患者参与医疗安全管理,营造病区安静环境,严格执行查对制度,正确识别患者身份,优化护理人力资源配置,以保证患者用药安全。     

多元文化需求就医服务体系构建及应用

目的调查外籍患者多元文化服务需求,构建就医服务体系,探究应用效果。方法采用“外籍患者多元文化服务需求问卷”,对某院2020年1月-6月372例外籍就诊患者进行调查,识别其多元文化服务需求,建立就医服务体系。结果外籍患者对语言交流的需求度最高（98.39%）,对医院环境的需求度最低（65.59%）。应用基于多元文化需求的就医服务体系后,外籍患者在语言交流、专业知识、隐私保护、饮食习惯、就诊流程、社交礼仪、医务人员服务态度和医院环境等方面的满意度均得以提高（P＜0.05）。结论多元文化服务需求调查在外籍患者就医服务体系构建中具有重要作用,有助于提高外籍患者就医满意度。     

一例促皮质素静脉外渗至局部皮肤坏死的案例解析与改进

对1例癫痫性痉挛患儿采用促皮质素静脉给药时发生静脉外渗至局部皮肤坏死的案例进行解析。针对事件发生原因,制定并采取措施:静脉穿刺难度事前评估,优化临床监护,加强相关知识培训,以肌肉注射代替静脉滴注等,避免了此类事件的再次发生,提升了临床合理用药水平,确保了患者安全。     

我国医疗质量安全不良事件分类的思考

患者安全问题已经成为世界各国医疗质量管理关注的焦点,从国家层面对医疗质量安全不良事件进行统一定义和分类具有重要意义。通过总结世界卫生组织、美国、英国以及我国目前不良事件分类及严重程度分级情况,结合我国相关上报数据,分析存在问题,建议国家及各级卫生行政部门发挥引导推动作用,医疗机构利用现有国家医疗质量安全相关平台,参考借鉴相关分类,开展同质化医疗质量安全管理工作。