Arnaiz Pilar, Dumas Eduardo, Heusser Felipe, González Rolando, Jalil Jorge
Departamento de Cardiología, Unidad de Cardiología Pediátrica, Pontificia Universidad Católica, Santiago, Chile.
Rev Esp Cardiol. 2004 Feb;57(2):173-6.
In normal children, any procedure that increases heart rate, such as the tilt test, may shorten the QT interval. The effect of the tilt test on QT interval in children with syncope remains unknown. We analyzed the response of RR and QT intervals during a tilt test in 3 groups of children: 28 healthy children (group 1), 26 with syncope of unknown etiology and negative tilt test results (group 2), and 17 with vasovagal syncope (group 3). During the tilt test, RR and QT intervals were significantly shortened in groups 1 and 2. In group 3, RR interval was lengthened during syncope whereas the QT interval remained constant. QT interval lengthening during the tilt test is not a characteristic finding in normal children or in children with vasovagal syncope.
在正常儿童中，任何增加心率的操作，如倾斜试验，都可能缩短QT间期。倾斜试验对晕厥儿童QT间期的影响尚不清楚。我们分析了3组儿童在倾斜试验期间RR间期和QT间期的反应：28名健康儿童（第1组）、26名病因不明且倾斜试验结果为阴性的晕厥儿童（第2组）和17名血管迷走性晕厥儿童（第3组）。在倾斜试验期间，第1组和第2组的RR间期和QT间期显著缩短。在第3组中，晕厥期间RR间期延长，而QT间期保持不变。倾斜试验期间QT间期延长并非正常儿童或血管迷走性晕厥儿童的特征性表现。
