Pereira de Sousa Lidiane Aparecida, Britto Raquel Rodrigues, Ribeiro Antonio Luiz, Baracho Sabrina Mattos, da Costa Val Barros Vladimir, Carvalho Vinícius Tostes, Parreira Verônica Franco
Federal University of Minas Gerais, Department of Physical Therapy, Laboratório de Avaliação e Pesquisa em Desempenho Cardiorrespiratório, Belo Horizonte, MG, Brazil.
J Cardiopulm Rehabil Prev. 2008 Jul-Aug;28(4):253-7. doi: 10.1097/01.HCR.0000327183.51992.76.
The 6-minute walk test (6MWT) is a simple and reliable method routinely used in the evaluation of many conditions including cardiac diseases. However, it is rarely performed in patients with pacemakers (PMs), and the applicability and safety in this group is not established. The purpose of this study was to verify the applicability and safety of the 6MWT in the evaluation of functional capacity of patients with PMs, considering the ergometry test (ET) as the criterion standard.
Twenty-four patients with rate-responsive PMs underwent a treadmill ET, using the Chronotropic Assessment Exercise Protocol, and a 6MWT, performed twice with a rest interval of 20 minutes. Functional capacity, heart rate, and blood pressure in each test were recorded.
The distance covered during the 6MWT significantly correlated with the oxygen uptake estimated from the treadmill ET (r = 0.709, P < .001). Peak heart rates and systolic blood pressure levels reached during the 2 tests were also significantly correlated. No adverse events or malignant arrhythmias were observed during the 6MWT. The distance walked during the 6MWT accurately predicted the patient performance on the ET (area under the receiver operating characteristic curve = 0.921). The ability to walk more than 538 m in the 6MWT predicted, with a sensitivity of 90% and a specificity of 79%, an estimated oxygen uptake above 10 metabolic equivalents (METs) on the ET.
The 6MWT can be considered safe to assess the submaximal functional capacity and can be used as an alternative test to evaluate the results of interventions in patients with permanent cardiac PMs.
6分钟步行试验（6MWT）是一种简单可靠的方法，常用于评估包括心脏病在内的多种疾病。然而，起搏器（PM）患者很少进行该试验，且该试验在这组患者中的适用性和安全性尚未确定。本研究的目的是验证6MWT在评估PM患者功能能力方面的适用性和安全性，以运动负荷试验（ET）作为标准对照。
24例具有频率适应性PM的患者接受了使用变时性评估运动方案的跑步机ET，并进行了6MWT，两次测试间隔20分钟的休息时间。记录每次测试中的功能能力、心率和血压。
6MWT期间行走的距离与跑步机ET估计的摄氧量显著相关（r = 0.709，P <.001）。两次测试期间达到的峰值心率和收缩压水平也显著相关。6MWT期间未观察到不良事件或恶性心律失常。6MWT期间行走的距离准确预测了患者在ET上的表现（受试者工作特征曲线下面积 = 0.921）。在6MWT中能够行走超过538 m，预测ET上估计摄氧量高于10代谢当量（METs）的敏感性为90%，特异性为79%。
6MWT可被认为是安全的，用于评估次极量功能能力，并且可作为评估永久性心脏PM患者干预结果的替代试验。
