Amlodipine slow heart rate
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Amlodipine and Its Effects on Heart Rate
Introduction to Amlodipine
Amlodipine is a dihydropyridine calcium channel blocker widely used in the treatment of hypertension and angina pectoris. It is known for its long duration of action and gradual onset, which distinguishes it from other calcium antagonists like nifedipine 46. This article explores the impact of amlodipine on heart rate, particularly in hypertensive patients and those with coronary artery disease.
Amlodipine and Heart Rate Variability
Impact on Sympathetic Nerve Activity
Amlodipine has been shown to reduce sympathetic nerve activity in hypertensive patients. In a study comparing amlodipine with nifedipine, it was found that amlodipine decreased plasma and urinary norepinephrine levels during chronic administration, unlike nifedipine, which increased these levels . This reduction in sympathetic activity is beneficial for cardiovascular outcomes as it suggests a lower stress response on the heart.
Heart Rate Power Spectral Analysis
Heart rate power spectral analysis revealed that amlodipine administration reduced the low-frequency to high-frequency ratio, indicating a shift towards increased vagal activity and reduced sympathetic dominance 13. This shift is associated with a more stable heart rate and reduced cardiovascular risk.
Hemodynamic Effects of Amlodipine
Blood Pressure and Heart Rate
Amlodipine effectively reduces blood pressure without significantly affecting heart rate. Its gradual onset of action prevents the activation of physiological reflexes that typically increase heart rate . This property makes amlodipine a favorable option for patients who need to manage hypertension without the risk of tachycardia.
Exercise and Cardiac Performance
During exercise, amlodipine has been shown to reduce myocardial oxygen consumption and limit the increase in heart rate, which is beneficial for patients with coronary artery disease 57. This effect helps in managing exertional angina by reducing the workload on the heart.
Cardioprotective Effects
Ischemic Heart Disease
Amlodipine has demonstrated cardioprotective effects in ischemic heart disease. It reduces myocardial ischemic injury by decreasing myocardial oxygen demand and positively influencing transmembrane calcium fluxes during ischemia and reperfusion . This reduction in ischemic injury translates to better maintenance of cardiac function and reduced infarct size.
Chronic Stable Angina
In patients with chronic stable angina, amlodipine significantly reduces both symptomatic and asymptomatic ischemic events over 24 hours . This reduction is achieved without significant changes in heart rate, making it a safe and effective treatment option for long-term management.
Conclusion
Amlodipine is a potent calcium channel blocker with unique properties that make it effective in managing hypertension and angina pectoris. Its ability to reduce sympathetic nerve activity, maintain stable heart rates, and provide cardioprotective effects during ischemic events makes it a valuable medication in cardiovascular therapy. The gradual onset and long duration of action further enhance its suitability for chronic use, ensuring consistent blood pressure control without adverse effects on heart rate.
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