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[Maximum flow velocity in the normally functioning Björk-Shiley mitral prosthesis].
Archivos Del Instituto De Cardiologia De Mexico
|January 1, 1986
Summary
Bjork-Shiley mitral valve prostheses can increase maximal blood flow velocity, even when functioning normally. This finding suggests limitations for pulsed wave Doppler in evaluating transprosthetic flow.
Area of Science:
- Cardiovascular Medicine
- Biomedical Engineering
- Medical Devices
Context:
- Heart valve prostheses are crucial for patients with valvular heart disease.
- The Bjork-Shiley mitral valve prosthesis is a commonly used mechanical device.
- Assessing prosthesis function non-invasively is essential for patient management.
Purpose:
- To evaluate the maximal blood flow velocity in patients with normally functioning Bjork-Shiley mitral prostheses.
- To compare these velocities with those in healthy individuals.
- To determine the utility of pulsed wave Doppler in assessing transprosthetic flow.
Summary:
- Maximal blood flow velocity was measured using pulsed wave Doppler in 12 patients with normally functioning Bjork-Shiley mitral prostheses (Group I) and 12 healthy controls (Group II).
- Group I exhibited significantly higher maximal velocities than Group II (p < 0.001).
- In 5 patients, velocities exceeded the Doppler unit's upper limit of 2.6 m/sec, indicating potential underestimation.
Impact:
- Normal functioning Bjork-Shiley mitral valves can lead to higher maximal blood flow velocities than previously reported.
- Pulsed wave Doppler has limitations in accurately evaluating blood flow through certain prosthetic valves.
- Further research may be needed to refine Doppler techniques or explore alternative methods for transprosthetic flow assessment.
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