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[Treatment of obstructive cardiomyopathy by permanent apical ventricular stimulation]
L Guize1, M C Iliou, T Lavergne
1Service de Cardiologie A, Hôpital Broussais, Paris.
Insights
Two chamber cardiac pacing offers an alternative treatment for obstructive hypertrophic cardiomyopathy, improving symptoms and reducing intraventricular gradients. However, its impact on patient survival remains unproven.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
Context:
- Obstructive hypertrophic cardiomyopathy (oHCM) treatment traditionally relies on medications like beta-blockers, calcium channel blockers, or amiodarone.
- These therapies may be insufficient or cause adverse effects in some patients.
- Surgical interventions are an option but carry inherent risks.
Purpose:
- To evaluate two chamber cardiac pacing as an alternative therapeutic strategy for obstructive hypertrophic cardiomyopathy.
- To assess the efficacy of cardiac pacing in managing symptoms and reducing the intraventricular gradient.
- To determine the optimal pacing parameters for achieving therapeutic benefits.
Summary:
- Two chamber cardiac pacing modifies the ventricular activation sequence, leading to symptom improvement and a decreased left intraventricular gradient in oHCM patients.
- Effective pacing requires continuous ventricular stimulation with a short atrioventricular period to ensure continuous pre-excitation while maintaining atrial contraction.
- The long-term survival benefit of continuous ventricular pacing in this patient population has not yet been established.
Impact:
- Cardiac pacing presents a potentially less invasive alternative to surgery for select oHCM patients.
- Understanding optimal pacing parameters is crucial for maximizing therapeutic outcomes.
- Further research is needed to confirm the survival benefits and long-term efficacy of this intervention.
Abstract:
The treatment of obstructive hypertrophic cardiomyopathy is classically based on beta blockers, cardiac calcium channel blockers or amiodarone to improve the symptoms and to decrease the intraventricular gradient. However, this treatment may prove to be insufficient or poorly tolerated. Two chamber cardiac pacing no constitutes an alternative to surgical treatment, as it improves the symptoms and decreases the left intraventricular gradient, by modifying the ventricular activation sequence. In order to be effective, ventricular pacing must be continuous, with a sufficiently short atrioventricular period to allow continuous ventricular preexcitation, while preserving atrial contraction. However, it has yet to be demonstrated that continuous ventricular pacing provides a survival benefit for these patients.