Can lisinopril cause bradycardia
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Can Lisinopril Cause Bradycardia?
Introduction to Lisinopril and Bradycardia
Lisinopril, an angiotensin-converting enzyme (ACE) inhibitor, is commonly prescribed for hypertension and heart failure. Bradycardia, defined as a slower than normal heart rate, can be a concerning side effect of various medications. This article explores the potential link between lisinopril and bradycardia, drawing on multiple research studies.
Case Reports of Bradycardia with Lisinopril
Concomitant Medication Interactions
Several case reports highlight instances where bradycardia occurred in patients taking lisinopril, often in conjunction with other medications. For example, an 85-year-old man experienced severe bradycardia and hypotension after starting tizanidine while on long-term lisinopril therapy. His heart rate dropped to 37 beats per minute, and his condition improved only after discontinuing tizanidine and withholding lisinopril temporarily . Similarly, a 77-year-old woman developed bradycardia as part of BRASH syndrome (Bradycardia, Renal Failure, Atrioventricular-Nodal Blockers, Shock, and Hyperkalemia) while on lisinopril and metoprolol. Her heart rate was refractory to atropine and dopamine but improved with calcium gluconate 35.
Age-Related Effects
Research on rats has shown that the effects of lisinopril on heart rate can be age-dependent. In older rats, short-term lisinopril treatment worsened the impairment of angiotensin-induced reflex bradycardia, whereas younger rats did not exhibit this effect . Chronic lisinopril treatment also demonstrated stronger reflex bradycardia in younger rats compared to older ones, suggesting that the cardiovascular effects of lisinopril diminish with age .
Mechanisms and Reflex Control
Reflex Bradycardia and Parasympathetic Activity
Studies have indicated that lisinopril can impair reflex control of heart rate. In normotensive males, both acute and chronic administration of lisinopril reduced blood pressure without changing heart rate but impaired vagally mediated reflexes such as the diving reflex, which is parasympathetically mediated . This suggests that lisinopril may increase parasympathetic activity, potentially leading to bradycardia.
Combined Drug Effects
In hypertensive rats, combined treatment with lisinopril and losartan unmasked the vasodepressor actions of angiotensin-(1-7), leading to transient bradycardia during antibody infusion . This indicates that the interaction between different components of the renin-angiotensin system can influence heart rate.
Conclusion
While lisinopril is primarily used to manage hypertension and heart failure, it can potentially cause bradycardia, especially when used in combination with other medications or in older patients. The mechanisms may involve increased parasympathetic activity and interactions within the renin-angiotensin system. Clinicians should monitor patients for signs of bradycardia, particularly when initiating or adjusting lisinopril therapy, and consider potential drug interactions and age-related effects.
Sources and full results
Most relevant research papers on this topic
Hypotension and bradycardia associated with concomitant tizanidine and lisinopril therapy.
Concomitant tizanidine and lisinopril therapy can cause severe hypotension and bradycardia in patients with pre-existing medical conditions.
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