Amlodipine heart rate effects
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Effects of Amlodipine on Heart Rate: A Comprehensive Review
Introduction to Amlodipine and Heart Rate
Amlodipine, a long-acting calcium channel blocker, is widely used in the treatment of hypertension and angina pectoris. Its effects on heart rate (HR) are of significant interest, particularly in patients with cardiovascular conditions. This article synthesizes findings from multiple studies to provide a clear understanding of how amlodipine influences heart rate.
Amlodipine and Heart Rate Variability (HRV)
Influence on HRV Parameters
Research indicates that amlodipine does not significantly alter heart rate variability (HRV) time domain parameters in hypertensive patients with stable angina pectoris and isolated left ventricular diastolic dysfunction. However, it does reduce total power, very low frequency power, and low frequency power, while maintaining high frequency power unchanged. This suggests a shift towards increased vagal activity, indicating a reduction in sympathetic autonomic nervous system activity .
Hemodynamic Effects and Heart Rate
Acute Hemodynamic Changes
In patients with stable angina pectoris, intravenous administration of amlodipine has been shown to increase heart rate from 75 ± 12 beats/min to 80 ± 15 beats/min. This increase is accompanied by a decrease in systemic vascular resistance and mean arterial pressure, without significant changes in cardiac output or other hemodynamic parameters . This suggests that amlodipine's vasodilatory effects can lead to a modest increase in heart rate.
Circadian Rhythms and Dosing Time
The timing of amlodipine administration can influence its effects on heart rate. A study comparing morning and evening dosing found that morning administration resulted in a greater nocturnal fall in blood pressure and a more pronounced reduction in heart rate during the night compared to evening dosing . This highlights the importance of dosing time in managing circadian variations in heart rate and blood pressure.
Sympathetic Nerve Activity and Heart Rate
Comparison with Nifedipine
Amlodipine has been shown to decrease plasma and urinary norepinephrine levels, indicating a reduction in sympathetic nerve activity. This effect contrasts with short-acting nifedipine, which increases sympathetic activity. The low-frequency to high-frequency ratio, a marker of sympathetic activity, is reduced with amlodipine, further supporting its role in lowering sympathetic nerve activity .
Animal Studies
In telemetric studies on rats, amlodipine increased heart rate more significantly during the light phase compared to the dark phase, suggesting a circadian phase-dependency in its cardiovascular effects . This finding aligns with human studies indicating that the timing of administration can influence heart rate outcomes.
Clinical Implications
Chronic Heart Failure
In patients with chronic heart failure, amlodipine did not significantly affect heart rate during rest or exercise. However, it did not induce an increase in sympathetic nerve activity, suggesting potential benefits in long-term cardiovascular outcomes .
Myocardial Ischemia
Amlodipine has been shown to reduce myocardial ischemic injury and improve heart rate stability during ischemic events. This effect is likely due to its ability to reduce myocardial oxygen demand and positively influence transmembrane calcium fluxes Lucchesi1989Rämö1989.
Conclusion
Amlodipine exerts a multifaceted influence on heart rate, primarily through its vasodilatory effects and reduction in sympathetic nerve activity. While it can cause a modest increase in heart rate acutely, its long-term administration appears to stabilize heart rate and improve autonomic balance. The timing of administration plays a crucial role in optimizing its cardiovascular effects, particularly in managing circadian variations in heart rate and blood pressure. These findings underscore the importance of personalized treatment strategies in patients with cardiovascular conditions.
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