Effects of permanent dual-chamber pacing on mitral regurgitation in hypertrophic obstructive cardiomyopathy
Summary
This summary is machine-generated.Dual-chamber pacing (DDD) effectively reduces mitral regurgitation and left ventricular outflow gradients in patients with hypertrophic obstructive cardiomyopathy. This intervention is beneficial even in the presence of significant mitral regurgitation, provided there are no organic mitral valve abnormalities.
Area Of Science
- Cardiology
- Cardiac Electrophysiology
- Cardiovascular Imaging
Background
- Hypertrophic obstructive cardiomyopathy (HOCM) is characterized by left ventricular outflow tract obstruction and often associated with mitral regurgitation.
- The management of HOCM with significant mitral regurgitation remains challenging.
Purpose Of The Study
- To evaluate the impact of chronic dual-chamber pacing (DDD pacing) on mitral regurgitation in patients diagnosed with HOCM.
- To determine if DDD pacing can alleviate mitral regurgitation and reduce left ventricular outflow gradients.
Main Methods
- A cohort of 23 patients with HOCM and mitral regurgitation underwent DDD pacing for an average of 16 months.
- Mitral regurgitation was assessed using Doppler-echocardiography, including semi-quantitative grading and measurement of the regurgitant jet area/left atrial area ratio.
- Left ventricular outflow gradients were measured before and after pacing intervention.
Main Results
- DDD pacing significantly reduced the left ventricular outflow gradient from 93 mmHg to 31 mmHg (P<0.0001).
- In patients with moderate to severe mitral regurgitation (grade II-IV), 9 out of 14 experienced improvement by at least one grade.
- The regurgitant jet area/left atrial area ratio decreased from 20% to 11% (P<0.0001).
- Persistent significant mitral regurgitation was linked to high residual outflow gradients or organic mitral valve abnormalities.
Conclusions
- DDD pacing effectively reduces both mitral regurgitation and left ventricular outflow gradients in HOCM patients without organic mitral valve disease.
- Significant mitral regurgitation should not preclude consideration of DDD pacing in HOCM patients lacking organic valve abnormalities.
- The degree of mitral regurgitation correlates with the residual outflow gradient in the absence of structural valve issues.
View abstract on PubMed