以下为句子列表：
英文: And we also know that we should avoid reducing preload in these patients because reducing preload may cause obstruction of left ventricular outflow tract which is not convenient, so we try to avoid diuretics and nitrates in this kind of patients, but we u
中文: 我们也知道我们应该避免减低这些患者的前负荷，因为减低前负荷会使本来就很艰难的左心室流出道更加容易阻塞，所以我们都会尽量避免给这类患者使用利尿剂和硝酸酯类药物，但我们经常会用到钙离子拮抗剂和?
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英文: Objective To assess the effect of QRS duration (QRSd) and cardiac function during right ventricular apex(RVA) pacing,right ventricular outflow tract (RVOT) pacing and right ventricular bifocal (RV-Bi) pacing.
中文: 目的比较右室心尖部(RVA)、右室流出道(RVOT)和右室双部位(RV-Bi)起搏的QRS宽度和对心功能的影响。
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英文: Electrophysiological effects of some ionic channel blockers on the left ventricular outflow tract of rabbit
中文: 离子通道阻断剂对家兔左心室流出道的电生理效应
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英文: Right Ventricular Outflow Tract as An Alternative Permanent Pacing Site
中文: 右室永久起搏可行的后备电极放置部位——右室流出道
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