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Current perspectives on pacing therapy in cardiomyopathies
S Weiner1, S L Zweibel, J N Gross
1Montefiore Medical Center, Bronx, New York 10467-2401, USA.
Insights
Dual-chamber pacing may offer symptomatic improvement for obstructive hypertrophic cardiomyopathy (HCM), but its effectiveness requires further investigation. Current evidence is mixed, necessitating comprehensive research before widespread recommendation.
Area of Science:
- Cardiology
- Medical Therapy
- Cardiac Pacing
Background:
- Hypertrophic cardiomyopathy (HCM) presents challenges in medical management.
- Surgical interventions for HCM are effective but carry risks.
- Uncontrolled studies suggested dual-chamber pacing benefits obstructive HCM patients symptomatically.
Purpose of the Study:
- To evaluate the symptomatic effects of dual-chamber pacing in obstructive hypertrophic cardiomyopathy.
- To clarify the unclear mechanisms behind pacing's potential benefits in HCM.
- To assess the consistency of pacing therapy benefits in dilated cardiomyopathy.
Main Methods:
- Review of uncontrolled studies on dual-chamber pacing in obstructive HCM.
- Analysis of recent randomized trials assessing pacing effects on HCM symptoms.
- Examination of recent data on pacing therapy for dilated cardiomyopathy.
Main Results:
- Randomized trials show less uniform effects of pacing on HCM symptoms than previously reported.
- The precise mechanism of pacing's effect on HCM remains unclear.
- Initial positive reports on pacing for dilated cardiomyopathy have been only partially confirmed.
Conclusions:
- Further comprehensive research is needed to validate the benefits of pacing therapy in HCM.
- Dual-chamber pacing cannot yet be recommended for widespread use in HCM.
- The efficacy of pacing in dilated cardiomyopathy requires additional investigation.
Abstract:
Hypertrophic cardiomyopathy (HCM) is a complex disease that is sometimes difficult to control with medical therapy. Surgical treatment is highly effective but can be associated with significant morbidity and mortality. It has been suggested in uncontrolled studies that patients with obstructive HCM may improve symptomatically when treated with dual-chamber pacing. Several hypotheses have been suggested to explain this phenomenon, but the mechanism still remains unclear. Many recent randomized trials showed much less uniform effects on symptoms than previously reported. These results indicate the need for further comprehensive inquiry into the effects of pacing on HCM before it can be recommended for widespread use. The data on the benefit of pacing therapy in dilated cardiomyopathy are much more recent and limited. Initial optimistic reports have been only partially confirmed.