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Shortened bleeding time in acute myocardial infarction and its relation to platelet mass
Insights
Shortened bleeding time indicates definite myocardial infarction in patients with chest pain. This diagnostic marker, along with platelet mass and age, aids in classifying patients, though a key factor in acute myocardial infarction remains unidentified.
Area of Science:
- Cardiology
- Hematology
Background:
- Chest pain is a common symptom requiring prompt diagnosis.
- Myocardial infarction (MI) diagnosis can be challenging in the early stages.
- Bleeding time is a measure of primary hemostasis.
Purpose of the Study:
- To investigate the diagnostic utility of bleeding time in patients presenting with chest pain.
- To identify factors influencing bleeding time in patients with suspected myocardial infarction.
Main Methods:
- Bleeding time was measured using the Simplate method with horizontal incision and venostasis.
- Study included 51 patients admitted to a coronary care unit within 12 hours of chest pain onset.
- Multiple regression analysis was used to identify determinants of bleeding time.
Main Results:
- Bleeding time was significantly shorter in patients with definite myocardial infarction (p < 0.0005).
- A bleeding time < 212 seconds correctly classified 84% of patients (89% sensitivity for definite MI).
- Bleeding time was independently determined by diagnostic group, platelet mass, and age.
Conclusions:
- Shortened bleeding time is a significant indicator of definite myocardial infarction in patients with chest pain.
- Bleeding time, platelet mass, and age are key determinants of bleeding duration.
- Further research is needed to identify the primary factor reducing bleeding time in acute myocardial infarction.
Abstract:
The bleeding time, using the Simplate method, horizontal incision, and venostasis, was measured in a study of 51 patients admitted to a coronary care unit within 12 hours of the onset of chest pain. The bleeding time was significantly shorter in the 28 patients who were found to have definite myocardial infarction compared with the 23 others with chest pain but no definite infarction (p less than 0.0005). A bleeding time of less than 212 seconds correctly classified 84% of patients (sensitivity for definite myocardial infarction 89%) presenting to the coronary care unit with chest pain. Multiple regression analysis showed the bleeding time in all patients to be determined independently (and with high significance) by the following variables in order of importance: diagnostic group, platelet mass (platelet count X mean volume), and age. Packed cell volume was not a significant determinant. In the group with definite myocardial infarction considered alone the same order of variables was observed in predicting bleeding time, but none of them was significant. A major variable reducing bleeding time in acute myocardial infarction remains to be determined. There was no association between bleeding time and creatine phosphokinase activity or infarct size in the group with definite myocardial infarction.