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手动与自动评估QT间隔和纠正的QT间隔
Benjamin Neumann1,2, A Suzanne Vink3,4, Ben J M Hermans5,6
1Department of Medicine I, LMU University Hospital, LMU Munich, Munich, Germany.
概括
与手动测量相比,自动QT间隔和QTc评估显示出显著的差异,特别是在长QT综合征患者中. 手动确认对于准确的突发心脏死亡风险评估至关重要.
科学领域:
- 心脏病学 心脏病学
- 医疗技术 医疗技术 医学技术
- 生物医学工程 生物医学工程
背景情况:
- 突然心脏死亡 (SCD) 风险分层依赖于心电图 (ECG) 衍生的心率校正的QT间隔 (QTc).
- 手动QTc确定是首选的,但耗时;自动供应商提供的结果提供方便,但它们在不同人群中的准确性是不确定的.
- 异常的QTc间隔,特别是在长QT综合征 (LQTS) 等疾病中,对可靠的SCD风险评估构成挑战.
研究的目的:
- 系统地评估自动生成和手动确定的QT间隔和QTc之间的一致性.
- 评估供应商提供的自动QTc测量在具有异常QTc间隔高流行率的队列中的可靠性.
- 确定特定的QTc范围,其中自动评估最容易错误分类.
主要方法:
- 一项多中心队列研究,包括1263名参与者 (720名LQTS患者,543名对照人) 与ECG.
- 使用触点和值方法进行手动QT间隔和QTc测量,与供应商提供的自动值进行比较.
- 使用类内相关系数和布兰德-阿尔特曼分析以95%的协议限值 (LoA) 来评估协议.
主要成果:
- 虽然队列平均值显示相似性,但双对布兰德-阿尔特曼分析显示自动和手动QTc之间高度不一致的协议.
- 对于QTc的协议极限跨度为108ms (触点方法) 和105ms (值方法),表明了相当大的变化.
- 自动QTc值在440-540毫秒 (触点) 和430-530毫秒 (值) 之间的误判风险最高,LQTS患者的差异更大.
结论:
- 供应商提供的自动QT间隔和QTc测量表现出与手动评估的显著对差异.
- 新的自动算法显示了改善协议和减少错误分类范围的潜力.
- 手动确认自动QT间隔和QTc结果是必不可少的,特别是在确定的高风险范围内以及具有挑战性的T波形态的情况下.
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