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Do preoperative laboratory tests predict blood transfusion needs in cardiac operations?
The Journal of Thoracic and Cardiovascular Surgery
|April 1, 1983
Summary
Preoperative coagulation tests in cardiac surgery patients rarely predicted the need for blood transfusions. Abnormal results in children and teenagers may require age-specific reference ranges for better interpretation.
Area of Science:
- Cardiovascular Surgery
- Hematology
- Anesthesiology
Background:
- Coagulopathy is a risk in cardiac surgery patients.
- Preoperative laboratory tests assess coagulation status.
- Blood component transfusion is common in cardiopulmonary bypass (CPB).
Purpose of the Study:
- To evaluate the predictive value of preoperative coagulation tests for blood component use.
- To compare test results between adult and pediatric cardiac surgery patients.
- To identify potential needs for age-specific reference ranges.
Main Methods:
- Retrospective analysis of 92 cardiac surgery patients with CPB.
- Comparison of preoperative prothrombin time (PT), partial thromboplastin time (PTT), lysis, bleeding times, fibrinogen, and platelet counts.
- Correlation of test results with blood component administration.
Main Results:
- Abnormal tests found in 34% of adults and 81% of pediatric patients.
- No significant difference in blood component use between patients with normal and abnormal tests.
- No single or combination of tests predicted excess transfusion needs.
- High abnormality rate in <20 years old not due to polycythemia.
Conclusions:
- Baseline coagulation tests (PT, PTT, platelets) may help assess coagulopathy risk.
- Preoperative testing may be reserved for specific populations (infants, polycythemic, high-risk history).
- Age-specific reference ranges for pediatric patients may be warranted.