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[Cardiac pacing in obstructive hypertrophic cardiomyopathies]
L Kappenberger1, N Aebischer, X Jeanrenaud
1Division de Cardiologie, CHUV, Lausanne, Suisse.
Insights
Two-chamber pacemakers offer significant benefits for obstructive hypertrophic cardiomyopathy patients unresponsive to medication. This cardiac pacing improves hemodynamic and clinical outcomes by altering left ventricular activation and reducing outflow obstruction.
Area of Science:
- Cardiology
- Biomedical Engineering
Context:
- Obstructive hypertrophic cardiomyopathy (oHCM) traditionally managed with medication or surgery.
- Cardiac pacing's immediate effects on infra-aortic obstruction have been recognized.
- Advancements in pacemaker technology enable new therapeutic strategies.
Purpose:
- To evaluate the efficacy of two-chamber pacemakers in patients with obstructive hypertrophic cardiomyopathy.
- To explore the mechanisms behind the beneficial effects of cardiac pacing in oHCM.
Summary:
- Two-chamber pacemakers demonstrate significant hemodynamic and clinical improvements in oHCM patients.
- Mechanisms include altered left ventricular activation sequence and reduced septal contact.
- Long-term benefits may involve ventricular remodeling due to relief of outflow obstruction.
Impact:
- Cardiac pacing presents a viable alternative for drug-refractory oHCM cases.
- This approach warrants consideration for a broader patient population.
- Further research into pacing mechanisms can optimize treatment strategies.
Abstract:
Up until recently, the first-line treatment of obstructive hypertrophic cardiomyopathy was pharmacological and surgical in refractory cases. However, the immediate beneficial effect of a cardiac pacing on infra-aortic obstruction has been known for many years. The development of sophisticated two-chamber pacemakers and their use in patients with obstructive hypertrophic cardiomyopathy has confirmed their beneficial effect both in terms of haemodynamic and clinical parameters. There appears to be many reasons for this advantageous effect and only some of them have been elucidated, including alteration of the activation sequence of the left ventricle secondary to apical ectopic electrical activation and reduction of the contact time of the mitral valve with the proximal septum and, in the long term, ventricular remodelling secondary to release of the outflow obstruction. The increasing number of publications reporting a beneficial effect of two-chamber pacemakers in these patients justifies consideration of this approach in all patients refractory to drug therapy.