The drug markedly slowed the heart rate and antagonized the positive chronotropic effect of isoprenaline.
冠益嗪明显减慢大鼠心率，拮抗异丙肾上腺素的正性变时作用。
CONCLUSION: GST exerted a negative chronotropic action and induced a delayed repolarization of pacemaker cells in SA nodes of rabbits.
结论：GST对家兔窦房结具有负性变时作用，并可延长复极化时程。
Objective To investigate the change of Chronotropic action and heart rate variability (HRV) in patients with essential hypertension (EH).
目的探讨原发性高血压(EH)患者变时性功能与心率变异性(HRV)的变化。
Methods Dual chamber rate adaptive pacemaker with closed loop stimulation were implanted into 16 patients with sinus chronotropic disability.
方法对窦房结变时性功能障碍的16例患者，植入闭环刺激双腔频率适应性起搏器。
Symptoms of SSS include: syncope, dizziness, palpitations, exertions dyspnea, fatigability from chronotropic incompetence, heart failure, and angina.
病窦综合征的症状包括：晕厥，头昏，心悸，劳力性呼吸困难，变时性功能不全，心衰，和心绞痛导致的易疲劳。
ECG is a commonly used heart function test in analysis of cardiac chronotropic and dromotropic, but it can not be used for detection of cardiac inotropic.
心电图是最常用的心功能检测方法，能监测心脏变时性和变传导性，但不能检测心脏的变力性。
Objective To discuss the relationship between age, gender and heart chronotropic ability, and provide some data to the programming of rate adaptive pacemakers.
目的探讨正常人的心脏变时能力与年龄、性别的关系，并为频率适应性起搏器的程控提供依据。
Objective To discuss the relationship between age, gender and heart chronotropic ability, and provide some data to the programming of rate adaptive pacemakers.
目的探讨正常人的心脏变时能力与年龄、性别的关系，并为频率适应性起搏器的程控提供依据。
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