March 1, 1992European Heart Journal
Doppler haemodynamic profiles of clinically and echocardiographically normal mitral and aortic valve prostheses
Key result
Mechanical aortic valves show higher peak velocities and smaller EOAs than bioprostheses despite overlapping mitral profiles.
- P<0.01
- n=380
Why the study?
Normal Doppler echocardiographic characteristics of different types of mitral and aortic valve prostheses were not well established to serve as controls for future assessments.
Population
380 consecutive patients with 415 normally functioning artificial valves
Comparison
Mechanical valves (Starr-Edwards, Bjork-Shiley, Duromedics) vs bioprostheses
Design
Observational Doppler echocardiographic study
Authors
Discussion
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Implication
Early postoperative baselines aid prosthetic valve surveillance; cross-sectional data leave open prospective validation for dysfunction detection.
Study Design
Type
Observational (n=380)
Multicenter
No
Structured PICO
P
Population
380 consecutive patients with 415 normally functioning artificial valves, without heart failure, undergoing Doppler echocardiography to establish normal characteristics.
O
Outcome
Doppler haemodynamic profiles including peak transaortic velocities, effective orifice areas, peak diastolic velocities, and pressure half-timessurrogate
Main Result
p-value: p=<0.01
This study establishes baseline normal Doppler echocardiographic characteristics for various mechanical and bioprosthetic valves, highlighting that early postoperative studies are essential for future comparison to detect dysfunction.
Cite This Study
Nihoyannopoulos et al. (1992) conducted an observational in Normally functioning artificial heart valves (n=380). Mechanical valves vs. Bioprostheses was evaluated on Peak transaortic velocities and effective orifice areas (p=<0.01). Mechanical aortic valves had higher peak transaortic velocities and smaller effective orifice areas compared with bioprostheses (P<0.01), while mitral valve profiles showed large overlap (P=NS).