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Study of platelet diameter distribution in patients with valvular heart disease and with prosthetic heart valve
Insights
Patients with valvular heart disease exhibit lower platelet counts and higher megathrombocyte indices (MI). Valve replacement partially corrects these platelet abnormalities, except for mitral valve disease.
Area of Science:
- Cardiology
- Hematology
- Platelet Biology
Background:
- Valvular heart disease (VHD) can affect various physiological systems.
- Platelet function and count may be altered in patients with VHD.
Purpose of the Study:
- To investigate platelet count and megathrombocyte index (MI) in VHD patients.
- To assess the impact of prosthetic heart valve replacement on these parameters.
Main Methods:
- Studied 100 VHD patients, measuring platelet count and MI.
- Analyzed platelet parameters in 45 patients post-prosthetic valve replacement.
Main Results:
- VHD patients showed significantly lower platelet counts and higher MI compared to controls.
- Platelet count increased and MI decreased post-surgery, except for mitral valve replacement where MI remained elevated.
- No differences in parameters were observed based on the specific type of valvular disease.
Conclusions:
- VHD is associated with a compensated thrombocytolytic state.
- Aortic valve replacement partially corrects platelet abnormalities, while mitral valve replacement does not.
Abstract:
We have studied the platelet count and the megathrombocyte index (MI), or percentage of platelets that have a diameter greater than 2.9 micrometers, in 100 patients with valvular heart disease. The mean platelet count is significantly lower than in controls (p less than 0.0005) and the MI is significantly increased (p less than 0.01). No difference was observed in these two parameters according to the variety of the valvular heart disease. 45 of the same patients were studied after prosthetic heart valve replacement. Our results show a significant elevation of platelet count and a significant decrease of MI compared with the presurgical values in all groups except in the mitral one in which MI remains increased. This work demonstrates the presence of platelet abnormalities which reveal a compensated thrombocytolytic state in patients with valvular heart disease and its partial correction after aortic, but not mitral, valve replacement.