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Platelet hyperaggregability in patients with chest pain and angiographically normal coronary arteries
Insights
Patients with chest pain and normal coronary arteries show increased platelet aggregation. This platelet hyperaggregability in vitro suggests a potential link, though clinical relevance requires further investigation.
Area of Science:
- Cardiology
- Hematology
- Platelet Physiology
Background:
- Chest pain with normal coronary arteries is a common clinical presentation.
- Platelet abnormalities are implicated in various cardiovascular conditions.
- Understanding platelet function in these patients is crucial.
Purpose of the Study:
- To investigate platelet abnormalities in patients presenting with chest pain and angiographically normal coronary arteries.
- To assess platelet aggregability and morphology in this patient cohort.
Main Methods:
- Platelet aggregometry was performed on 41 patients using adenosine diphosphate and epinephrine as stimuli.
- Platelet morphology was evaluated using transmission electron microscopy.
- Exclusion criteria included conditions known to affect platelet function; healthy volunteers served as controls.
Main Results:
- Patients exhibited significantly increased platelet aggregation in response to both adenosine diphosphate and epinephrine compared to controls (p < 0.001).
- Electron microscopy revealed altered platelet morphology, with fewer dendritic (intermediate) forms and more round/abortive (inactive) and spread (activated) forms.
Conclusions:
- Patients with chest pain and normal coronary arteries demonstrate in vitro platelet hyperaggregability.
- The observed platelet dysfunction warrants further research to clarify its clinical significance in this population.
Abstract:
Forty-one patients with chest pain and angiographically normal coronary arteries were studied for platelet abnormalities. Patients with conditions known or suspected to be associated with chest pain or platelet dysfunction were excluded. After coronary angiography and 2-week withdrawal from all medications, platelet aggregometry was performed using peripheral venous plasma samples and 3 concentrations of adenosine diphosphate, 2.34, 1.17 and 0.58 microM, and epinephrine, 11, 1.1 and 0.55 microM, as stimuli. Platelet morphology in response to surface contact (adhesion) was evaluated by transmission electron microscopy to determine the percentage of platelets in the round/abortive (inactive), dendritic (intermediate) and spread (activated) forms. Plasma specimens obtained from healthy volunteers of similar age and sex were analyzed in parallel and served as control subjects. Compared with control subjects, patients had increased aggregation at all concentrations of both adenosine diphosphate and epinephrine (p less than 0.001). Patients also had fewer platelets in the dendritic form and more in the round/abortive and spread forms. Thus, patients with chest pain and normal coronary arteries have platelet hyperaggregability in vitro, although the clinical relevance of this finding is unclear.