Related Experiment Videos
[Doppler echocardiography in the examination of normally functioning artificial mitral and aortic valves]
T Forster1, A Varga, A Borthaiser
1Szent-Györgyi Albert Orvostudományi Egyetem, Szeged.
Insights
Doppler echocardiography effectively assesses prosthetic valve function. Specific velocity and pressure half-time criteria help identify normal function in mitral and aortic valves.
Area of Science:
- Cardiology
- Medical Imaging
Context:
- Prosthetic heart valves are crucial for patients with valvular heart disease.
- Accurate assessment of prosthetic valve function is essential for patient management.
- Doppler echocardiography has emerged as a key non-invasive imaging modality.
Purpose:
- To evaluate the utility of Doppler echocardiography in assessing the function of prosthetic mitral and aortic valves.
- To establish Doppler echocardiographic criteria for normal prosthetic valve function.
- To investigate correlations between prosthetic valve type, size, and hemodynamic parameters.
Summary:
- Doppler echocardiography was used to assess 902 patients with prosthetic valves.
- No significant correlation was found between valve type and gradient.
- Valve size strongly correlated with gradient in aortic valve replacement.
- Established criteria for normal mitral (velocity < 2 m/s, pressure half-time < 130 ms) and aortic (velocity < 3 m/s) valve function were identified.
- Over 95% of cases met these criteria, demonstrating Doppler echocardiography's suitability for detecting normal prosthetic valve function.
Impact:
- Doppler echocardiography provides a reliable, non-invasive method for monitoring prosthetic heart valve performance.
- The study defines specific hemodynamic parameters indicative of normal prosthetic valve function.
- Colour Doppler enhances the accuracy of measurements by optimizing alignment.
Abstract:
Patients with prosthetic valves were investigated by Doppler echocardiography in 902 cases between November 1987 and February 1990. The parameters of 209 of 344 mitral and 258 of 299 aortic prosthetic valves were evaluated. No significant correlation was found between the type of aortic or mitral prosthetic valves and the measured gradient. As concerns the size of the valve and the measured gradient, a close correlation for aortic valve replacement was detected. For a normally functioning mitral prosthetic valve, a maximum early diastolic velocity of less than 2 m/s (16 mm Hg gradient) and a pressure half-time of less than 130 ms (mitral valve area 1.8 cm2) were characteristic. In cases of aortic valve replacements, the maximum velocity was less than 3 m/s (36 mm Hg gradient), except for the small-diameter valves. More than 95% of the cases met these criteria. (Even if small-diameter valves were included, a maximum velocity of more than 3 m/s occurred only in 8.9%.) Doppler echocardiography is a suitable tool for detecting normal prosthetic valve function, while colour Doppler allows the optimal alignment of jet direction and Doppler beam.