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[Predictive indices of the persistence of left ventricular dilatation after valve replacement for chronic aortic
A Khatouri1, P D Fall, C Mouyopa
1Service de Cardiologie, Hôpital Militaire d'Instruction Mohammed V, Rabat, Maroc.
Insights
Echocardiography can predict persistent left ventricular dilatation after aortic valve replacement. Key indicators include enlarged ventricular diameters and reduced ejection fraction, guiding long-term patient management.
Area of Science:
- Cardiology
- Medical Imaging
- Cardiac Surgery
Background:
- Chronic aortic incompetence often leads to left ventricular dilatation.
- Valve replacement is a common treatment, but persistent dilatation can occur.
- Predictive factors for post-operative left ventricular dilatation require definition.
Purpose of the Study:
- To identify echocardiographic indices that predict persistent left ventricular dilatation one year after aortic valve replacement.
- To establish criteria for assessing long-term ventricular remodeling post-surgery.
Main Methods:
- Echocardiography was performed on 34 patients pre-operatively and at 1, 6, and 12 months post-surgery.
- Measurements included ventricular diameters, shortening fraction, ejection fraction, and Doppler indices of aortic incompetence.
- Preoperative data were compared with 1-year post-operative outcomes.
Main Results:
- Persistent left ventricular dilatation was associated with preoperative end-diastolic diameter > 80 mm, end-systolic diameter > 55 mm, shortening fraction < 25%, ejection fraction < 50%, jet diameter > 16 mm, jet diameter/subaortic diameter ratio > 65%, and half-pressure time < 350 ms.
- These specific echocardiographic parameters were significantly correlated with continued ventricular enlargement.
Conclusions:
- Preoperative echocardiographic measurements, including ventricular dimensions and Doppler flow characteristics, are crucial for predicting persistent left ventricular dilatation.
- Specific thresholds for end-diastolic diameter, end-systolic diameter, shortening fraction, jet diameter, jet diameter/subaortic diameter ratio, and half-pressure time identify patients at risk.
- These findings aid in managing patients undergoing aortic valve replacement for chronic aortic incompetence.
Abstract:
The objective of this study was to define the echocardiographic indices predictive of persistence of left ventricular dilatation one year after valve replacement for chronic aortic incompetence. Thirty four consecutive patients (32 men and 2 women, age: 35.6 +/- 10 years) operated for post-rheumatic chronic aortic incompetence, were included in this series. All patients were investigated by echocardiography less than 15 days before and one, six and twelve months after surgery. The parameters studied consisted of measurement of ventricular diameter, shortening fraction and ejection fraction as well as aortic incompetence Doppler indices (jet-left ventriculr outflow tract diameter, jet-left ventricular outflow tract diameter/subaortic diameter ratio, half-pressure time, aortic isthmus end-diastolic velocity). Preoperative echocardiographic data and the results one year after valve replacement were compared for each patient. The left ventricle remained more dilated at one year in patients with a preoperative end-diastolic diameter > 80 mm, an end-systolic diameter > 55 mm, a shortening fraction < 25%, an ejection fraction < 50%, a jet diameter > 16 mm, a jet diameter/subaortic diameter ratio > 65% or a half-pressure time < 350 ms. In conclusion; an end-diastolic diameter > 80 mm, an end-systolic diameter > 55 mm, a shortening fraction < 25%, a jet diameter > 16 mm, a jet diaméter/subaortic diameter ratio > 65% and a half-pressure time < 350 ms appear to represent the main predictive factors of the persistence of ventricular dilatation one year after aortic valve replacement for chronic aortic incompetence.