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Ivabradine
Indications
FDA-Approved Indications
Ivabradine is approved by the US Food and Drug Administration (FDA) in the United States for use in patients with symptoms due to stable heart failure and an ejection fraction of 35% or less to reduce their risk of hospital admission for worsening heart failure.[1][2][3] Patients on ivabradine therapy should have a resting heart rate of at least 70 beats per minute (bpm) and be in normal sinus rhythm. They should also be receiving the maximally tolerated β-blocker dose or have a contraindication to β-blocker therapy.
According to the American College of Cardiology (ACC) and American Heart Association (AHA) 2022 heart failure guidelines, ivabradine may be beneficial in reducing hospitalizations due to heart failure and mortality in patients with symptomatic, stable chronic heart failure with reduced ejection fraction, specifically those with a left ventricular ejection fraction less than 35%. This applies to patients receiving guideline-directed medical therapy, including a β-blocker at the highest tolerated dose and a resting heart rate greater than 70 bpm while in sinus rhythm. Additionally, a network meta-analysis indicates that the combination of angiotensin-converting enzyme inhibitors, β-blockers, mineralocorticoid receptor antagonists, and ivabradine is effective in reducing hospitalizations for heart failure, with a risk ratio (RR) of 0.27 (95% CI, 0.18-0.39).[4][5][6] In a meta-analysis, patients with heart failure receiving ivabradine showed significant improvements in left ventricular ejection fraction and a decrease in heart rate compared to the standard treatment group.[7] The FDA has also approved ivabradine for children older than 6 months with symptomatic heart failure due to dilated cardiomyopathy.[8][9]
Off-Label Uses
In Europe, ivabradine is used for patients with heart failure and chronic stable angina.[10] According to the 2015 guidelines from the ACC, AHA, and Heart Rhythm Society (HRS), ivabradine is a reasonable option for treating patients with symptomatic inappropriate sinus tachycardia.[11][12][13] A pilot study demonstrated the feasibility of personalized perioperative ivabradine for heart rate management in surgical patients. The rationale lies in the association between heart rate and perioperative myocardial injury, suggesting that ivabradine may reduce cardiac risk. Further trials are needed to assess its efficacy in patients at higher risk of complications.[14] Additionally, ivabradine is being investigated for tachycardia-induced cardiomyopathy and focal atrial tachycardia in pediatric patients.[15] Ivabradine shows promise in reducing heart rate and improving quality of life in patients with hyperadrenergic postural orthostatic tachycardia syndrome. Ivabradine has also been explored in the treatment of postural orthostatic tachycardia syndrome in patients along with midodrine and β-blockers. Additional research is required to validate the findings.[16][17][18][19]
Ivabradine may be a safe and effective treatment for refractory postoperative junctional ectopic tachycardia in pediatric patients, with rapid action and minimal adverse effects. Further research is needed to establish the optimal dosing regimen and assess long-term safety.[20] In the BRAKE-AF trial, ivabradine reduced heart rate modestly in permanent atrial fibrillation but was less effective than digoxin. Ivabradine was better tolerated, with fewer serious adverse events.[21][22] Ivabradine shows promise in managing congenital junctional ectopic tachycardia by effectively reducing heart rate and stabilizing rhythm, even in refractory cases. However, current evidence is limited by small sample sizes and mostly retrospective designs; larger, prospective, multicenter studies are needed.[23] According to the 2024 AHA/ACC guidelines, in patients with severe mitral stenosis who cannot undergo mitral valve intervention before noncardiac surgery, perioperative heart rate control with agents such as calcium channel blockers, β-blockers, ivabradine, or digoxin may be considered to prolong diastolic filling time and reduce perioperative cardiovascular complications.[24]
Mechanism of Action
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Mechanism of Action
Ivabradine blocks the channel responsible for the cardiac pacemaker current, I(f), which regulates heart rate. This results in prolonged diastolic time and reduced heart rate.[25] HCN4 is the gene encoding the hyperpolarization-activated cyclic nucleotide-gated channel 4, which generates the I(f), or “funny,” current responsible for pacemaker activity in the sinoatrial node.[26] Rapid resting heart rate can lead to detrimental effects on left ventricular function and has been associated with adverse outcomes in patients with cardiovascular disease. Therefore, lowering resting heart rate to reduce cardiovascular morbidity and mortality is a therapeutic target for drug manufacturers. Ivabradine reduces heart rate but does not affect myocardial contraction, relaxation, or ventricular repolarization.
Clinical Evidence
The SHIFT trial was a double-blind, placebo-controlled study of patients with symptomatic heart failure, an ejection fraction less than or equal to 35%, in sinus rhythm with a heart rate of at least 70 bpm, who had been admitted for heart failure within the past year and were on stable heart failure treatment, including β-blockers. Patients received ivabradine titrated to 7.5 mg twice daily or placebo. The goal was to determine whether ivabradine would reduce hospitalizations and/or mortality due to heart failure. Ivabradine reduced the primary endpoint, which was a composite of hospital admissions due to heart failure and mortality. Bradycardia and visual adverse effects (phosphenes) occurred more in patients receiving ivabradine than in those in the placebo group.[27][28][29][30]
The BEAUTIFUL trial was a randomized, placebo-controlled, multinational trial to investigate whether reducing heart rate with ivabradine affected cardiovascular morbidity and mortality in patients with coronary artery disease and an ejection fraction of less than 40%. Patients had a resting heart rate of at least 60 bpm. Patients received ivabradine 5 mg twice daily, with the dose increased to 7.5 mg twice daily or placebo. Most patients were also receiving β-blocker therapy. Ivabradine did not affect the primary composite endpoint of cardiovascular mortality, hospital admissions for myocardial infarction, or worsening heart failure. In patients with heartbeats of 70 or greater, ivabradine reduced hospital admissions due to fatal or nonfatal myocardial infarction.[31]
SIGNIFY was a randomized trial evaluating the addition of ivabradine to standard therapy in patients with stable coronary artery disease but no heart failure. Participants had to be at least 55 years old and have a resting heart rate of at least 70 bpm.[32] The target heart rate was 55 to 60 bpm. Patients received either 10 mg of ivabradine twice daily or a placebo. The primary endpoint was a composite of death or non-fatal myocardial infarction. After 28 months, there was no significant difference between the ivabradine and placebo groups. Bradycardia occurred more with ivabradine than with placebo. The primary endpoint was higher in patients in the ivabradine group who initially had angina that limited activity.
Pharmacokinetics
Absorption: Under fasting conditions, ivabradine reaches peak plasma concentrations approximately 1 hour after oral administration. Due to first-pass metabolism in the gastrointestinal tract and liver, its absolute oral bioavailability is about 40%. Food intake delays absorption by approximately 1 hour and increases plasma exposure by 20% to 40%. Therefore, ivabradine should be administered with food.
Distribution: Ivabradine is approximately 70% bound to plasma proteins. The volume of distribution at steady state is approximately 100 liters.
Metabolism: Ivabradine undergoes extensive hepatic metabolism via CYP3A4-mediated oxidation in the liver and intestines. The major metabolite, N-desmethyl ivabradine, possesses similar pharmacological activity as the parent compound and is present at approximately 40% of ivabradine’s plasma concentration. This metabolite is also further metabolized by CYP3A4.[33]
Elimination: Ivabradine’s plasma concentration declines with a distribution half-life of 2 hours and an effective elimination half-life of about 6 hours. The total clearance is 24 L/h, with renal clearance accounting for approximately 4.2 L/h. Approximately 4% of the administered dose is excreted unchanged in the urine, while metabolites are primarily excreted via the urine and feces.
Administration
Available Dosage Forms and Strengths
Ivabradine is available in oral tablet formulations of 5 mg and 7.5 mg, as well as an oral solution of 5 mg/5 mL (1 mg/mL). The tablets are scored and can be divided into 2.5 mg doses. Recent advances in pipeline include the development of a once-daily sustained-release formulation. This new formulation has demonstrated effectiveness in enhancing left ventricular function, improving quality of life, and reducing hospitalization rates in patients with stable heart failure with reduced ejection fraction, while maintaining a safety profile similar to that of the conventional twice-daily formulation.
Adult Dosage
The following describes the appropriate dosing of ivabradine for adults and for children weighing more than 40 kg:
- The initial dose should be 5 mg twice daily.
- The dose can be adjusted after 2 weeks based on the heart rate.
- The maximum dose is 7.5 mg twice daily.
- Patients with conduction defects or bradycardia can be initiated on 2.5 mg twice daily.
- The reduction in heart rate depends on the baseline heart rate and the dose of ivabradine.
Dose Adjustment
- If the heart rate exceeds 60 bpm, the dose should be increased by 2.5 mg twice daily, up to a maximum of 7.5 mg daily.
- If the heart rate is 50 to 60 bpm, the current dose should be continued.
- If the heart rate is less than 50 bpm or the patient is experiencing symptoms of bradycardia, the dose should be reduced by 2.5 mg twice daily. Persistent bradycardia following dose reduction may necessitate stopping treatment.
- According to the ACC/AHA/HRS guidelines, for inappropriate sinus tachycardia (off-label use), the dose range is 5 mg twice daily to a maximum dose of 7.5 mg twice daily.[34]
Specific Patient Populations
Hepatic impairment: No dose adjustment is required for mild or moderate hepatic impairment. However, ivabradine is contraindicated in patients with severe hepatic impairment (Child-Pugh C) due to a lack of studies in this population and anticipated increased systemic exposure.
Renal impairment: No dosage adjustment for ivabradine is necessary for creatinine clearance of 15 to 60 mL/min. No clinical data are available for patients with a creatinine clearance of less than 15 mL/min. Ivabradine reduced dialysis-related hypotension and heart rate in hemodialysis patients with chronic heart failure, showing potential to improve quality of life. However, further research is required.[35]
Pregnancy considerations: An observational study of ivabradine exposure during pregnancy found no significant teratogenic effects, with 1 case of congenital disabilities (tracheal atresia). However, due to adverse outcomes in animal studies and the lack of human data, ivabradine is contraindicated in pregnancy, and alternative treatments with established safety profiles should be prioritized.[36] Clinicians should recommend that females of reproductive potential use reliable contraception during ivabradine treatment.
Breastfeeding considerations: According to the product label, there are no data on ivabradine in human milk or its effects on breastfed infants or milk production. Animal studies have shown that ivabradine is present in rat milk, so breastfeeding is not recommended due to potential risks to infants.[37][38]
Pediatric patients: The safety and efficacy of ivabradine have been established in pediatric patients aged 6 months to 18 years. For patients weighing less than 40 kg, the initial dose is 0.05 mg/kg twice daily with food. Dose adjustments of 0.05 mg/kg can be made every 2 weeks based on heart rate. The maximum dose is 0.2 mg/kg for patients aged 6 months to less than 1 year and 0.3 mg/kg for patients aged 1 year and older, with a maximum daily dose of 7.5 mg, administered twice daily.
Older patients: Ivabradine demonstrates no significant differences in efficacy between patients aged 65 or older and younger patients. According to the ACC's recommendation, the recommended dose of ivabradine is 2.5 mg twice daily for patients aged 75 or older.[39]
Adverse Effects
The most common adverse effects associated with ivabradine administration, according to the product label, include bradycardia, atrial fibrillation, hypertension, and phosphenes.
Ivabradine can cause bradycardia, sinus arrest, and heart block. Sinus node dysfunction, first- or second-degree atrioventricular block, bundle branch block, ventricular dyssynchrony, and/or concomitant use of other heart rate–reducing drugs increase the risk of bradycardia. In the SHIFT trial, symptomatic bradycardia occurred in 5% of patients taking ivabradine compared to 1% in the placebo group. Asymptomatic bradycardia occurred in 6% of patients on ivabradine compared to 1% in the placebo group. Bradycardia led to permanent withdrawal from the study in 1% of patients on ivabradine and less than 1% of those in the placebo group. QT prolongation, torsade de pointes, and other arrhythmias may occur due to ivabradine-induced bradycardia.[40] Ivabradine increases the risk of atrial fibrillation. Discontinue ivabradine if atrial fibrillation occurs.
Visual adverse effects (phosphenes/luminous phenomena) have been observed. Possible explanations include ivabradine's inhibition of the retina's I(h) current. During the SHIFT trial, known phosphenes occurred in 3% of patients taking the ivabradine compared to less than 1% in the placebo group. This difference in the occurrence of phosphenes was statistically significant.[41][42]
Postmarketing adverse effects of ivabradine include syncope, hypotension, angioedema, erythema, rash, pruritus, vertigo, and diplopia.[3]
Drug-Drug Interactions
Negative chronotropic drugs: A significant proportion of patients who are prescribed ivabradine also receive treatment with a β-blocker. When ivabradine is combined with other medications that decrease heart rate, such as digoxin, amiodarone, or additional β-blockers, the risk of bradycardia increases.[43] Therefore, it is essential to monitor heart rate closely in patients who are administered ivabradine in conjunction with these negative chronotropic agents.
CYP3A4 inducers: CYP3A4 inducers, such as St. John's wort, rifampicin, barbiturates, and phenytoin, should be avoided during ivabradine therapy.[44]
CYP3A4 inhibitors: CYP3A4 metabolizes ivabradine. Administering CYP3A4 inhibitors increases ivabradine plasma concentrations, while CYP3A4 inducers reduce them. Increased ivabradine levels may potentiate bradycardia and conduction abnormalities. The coadministration of potent CYP3A4 inhibitors with ivabradine is contraindicated. Strong inhibitors include azole antifungals such as itraconazole; macrolide antibiotics, such as telithromycin and clarithromycin; HIV protease inhibitors; and nefazodone.[45] Verapamil and diltiazem are also CYP3A4 inhibitors, which increase ivabradine levels and, consequently, the risk of bradycardia.[46]
Contraindications
Ivabradine is contraindicated for patients with the following conditions:
- Decompensated heart failure
- Blood pressure less than 90/50 mm Hg
- Conduction abnormalities (eg, sick sinus syndrome, sinoatrial block, or third-degree atrioventricular block) unless a pacemaker is controlling the heart rate
- Severe liver impairment
- Patients taking cytochrome P450 3A4 (CYP3A4) inhibitors
- Pacemaker dependence
- Resting heart rate less than 60 bpm before therapy is initiated [47]
Warnings and Precautions
Monitoring
The following are recommendations for monitoring patients receiving ivabradine:
Toxicity
Signs and Symptoms of Overdose
Ivabradine overdose often presents with severe sinus bradycardia and prolonged periods of asystole, which can be refractory to atropine. Symptoms include a significant reduction in heart rate, with some cases presenting a nadir as low as 15 bpm. The toxicity may be influenced by the severity of the overdose and the individual's serum levels of ivabradine. Additionally, overdose can lead to prolonged sinus node recovery time and QT interval, potentially increasing the risk of arrhythmias, including atrial fibrillation and torsades de pointes. Fatal intoxication has also been reported.[49]
Management of Overdose
Management of ivabradine overdose focuses on reversing the bradycardia and stabilizing the heart rate. There is no antidote for ivabradine. Intravenous fluids and supportive treatment should be provided. Dopamine and isoproterenol can temporarily increase heart rate, but in some cases, a temporary pacemaker may be necessary to maintain adequate cardiac output.[50][51]
Pause and Reflect
- How should clinicians apply current guideline recommendations for ivabradine use in adults and pediatric patients with heart failure?
- What monitoring strategies and dose adjustments are necessary to optimize ivabradine therapy while minimizing adverse effects and toxicity?
- How do clinicians identify and manage clinically significant drug-drug interactions and contraindications associated with ivabradine therapy?
- What are some signs of toxicity from ivabradine?
Enhancing Healthcare Team Outcomes
Ivabradine is FDA-approved in the United States for use in patients with symptoms due to stable heart failure and an ejection fraction of 35% or less to reduce their risk of hospital admission for worsening heart failure. An interprofessional team typically manages heart failure, comprising a cardiologist, intensivist, internist, nephrologist, pulmonologist, family medicine specialist, nursing staff, and pharmacist. Healthcare professionals who prescribe ivabradine should monitor their patients' heart rates regularly to ensure optimal treatment. This medication can cause bradycardia, and drug interactions should be kept in mind.[52][53] Cardiologists prescribe ivabradine for heart failure, closely monitoring patient response, particularly heart rate. Pharmacists ensure appropriate dosing, identify potential drug interactions, and provide patient education regarding the proper use and adverse effects of ivabradine. Nurses monitor patients for bradycardia and overall clinical status. Primary care physicians manage comorbidities and collaborate with specialists to ensure proper follow-up. Emergency care physicians are responsible for treating ivabradine overdose or toxicity, focusing on managing bradycardia and potential arrhythmias.
Patient education by all healthcare professionals without using medical or technical jargon is essential.[54] A pilot study in long-term care settings for heart failure found that a multimodal interprofessional intervention, including specialist-supported bedside teaching, improved knowledge of heart failure and enhanced collaborative communication. Participants reported increased confidence, clinical proficiency, and more effective interprofessional collaboration. The intervention is feasible and showed a favorable preliminary impact on care processes.[55] An interprofessional team approach and effective communication between all healthcare providers are crucial to minimizing potential adverse effects and enhancing patient outcomes related to ivabradine pharmacotherapy.
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