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Mitral regurgitation and left ventricular outflow tract obstruction in hypertrophic cardiomyopathy. Analysis by
S I Drăgulescu1, C Streian, C Kuzman
1First Medical Clinic, Department of Cardiology, County Timişoara Hospital, Romania.
Insights
Doppler echocardiography confirmed mitral regurgitation and left ventricular outflow tract obstruction in patients with asymmetric septal hypertrophy. This non-invasive technique accurately assessed pressure gradients in hypertrophic cardiomyopathy.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Asymmetric septal hypertrophy is a key feature of hypertrophic cardiomyopathy.
- Mitral regurgitation and left ventricular outflow tract obstruction are common complications.
Purpose of the Study:
- To evaluate the utility of Doppler echocardiography in assessing mitral regurgitation and left ventricular outflow tract gradients.
- To measure left ventricular systolic pressure using Doppler-derived velocities and Bernoulli's formula.
Main Methods:
- Doppler echocardiography was used to study five patients with asymmetric septal hypertrophy.
- Mitral regurgitant and left ventricular outflow tract jets were analyzed.
- Bernoulli's formula (4V² = P1-P2) was applied to estimate pressure gradients.
- Aortic blood pressure and carotid pulse tracings were recorded simultaneously.
Main Results:
- All patients exhibited outflow tract pressure gradients (peak 84 ± 11.7 mmHg) and mild mitral regurgitation.
- Peak flow velocities were 4.6 ± 0.26 m/sec in the outflow tract and 6.5 ± 0.51 m/sec in the mitral regurgitant jet.
- Doppler-derived ventricular systolic pressures were comparable to those obtained by other methods (180 ± 24.2 vs 186 ± 13.5 mmHg).
Conclusions:
- Doppler echocardiography is effective in confirming mitral regurgitation in asymmetric septal hypertrophy.
- The study validates Doppler echocardiography for assessing obstruction in hypertrophic cardiomyopathy.
- This non-invasive method accurately quantifies pressure gradients and confirms actual obstruction.
Abstract:
In a group of five patients with asymmetric septal hypertrophy, the presence of the mitral regurgitation and the left ventricular outflow tract gradient were studied by the Doppler echocardiographic technique. By means of Bernoulli's formula 4V2 = P1-P2, left ventricular maximal systolic pressure was assessed using mitral regurgitant and left ventricular outflow tract jets. Aortic systolic and diastolic blood pressures were measured by cuff sphygmomanometry, and simultaneous carotid pulse tracings were recorded. All patients had outflow tract pressure gradients (peak 84 +/- 11.7 mmHg) and mild mitral regurgitation. Continuous wave Doppler study recorded peak flow velocities in the outflow tract (4.6 +/- 0.26 m/sec) and mitral regurgitant (6.5 +/- 0.51 m/sec) jets. The values for ventricular systolic pressures by both methods were similar (180 +/- 24.2 vs 186 +/- 13.5 mmHg). This study confirms the presence of mitral regurgitation and actual obstruction in hypertrophic cardiomyopathy with asymmetric septal hypertrophy.