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Perturbations in laboratory values after coronary artery bypass graft surgery with cardiopulmonary bypass
Patrick Möhnle1, Nanette M Schwann, William K Vaughn
1Clinic for Anesthesiology, Ludwig-Maximilians-Universität, München, Germany.
Insights
Post-coronary artery bypass grafting (CABG) with cardiopulmonary bypass (CPB), expect significant changes in lab values like increased platelets and white blood cells. Recognizing these common postoperative hematology and chemistry shifts is crucial for accurate clinical research and patient care.
Area of Science:
- Cardiovascular Surgery
- Clinical Pathology
- Medical Laboratory Science
Background:
- Coronary artery bypass grafting (CABG) is a common surgical procedure.
- Cardiopulmonary bypass (CPB) is frequently used during CABG.
- Understanding postoperative laboratory changes is essential for managing patients and conducting research.
Purpose of the Study:
- To document sequential changes in common laboratory values following CABG with CPB.
- To provide a reference for expected laboratory alterations in the postoperative period.
Main Methods:
- Analysis of laboratory data from 375 patients undergoing uncomplicated CABG with CPB.
- Data collected preoperatively, at extubation, and at five subsequent time points up to 14 days post-extubation.
- Focus on data from placebo patients without perioperative complications (n=123) for later time points.
Main Results:
- Postoperative coagulation values remained within normal limits at extubation.
- Platelet counts and white blood cell counts (primarily neutrophils) increased significantly above reference ranges.
- Serum chemistry showed persistent hyperglycemia, elevated creatine kinase, lactate dehydrogenase, AST, ALT, and decreased total protein and albumin.
Conclusions:
- Laboratory values in hematology, coagulation, and serum chemistry undergo substantial changes after uncomplicated CABG with CPB.
- Awareness of these predictable alterations aids clinical research and prevents misinterpretation of non-clinically significant findings.
- Facilitates appropriate clinical decision-making and research interpretation post-CABG.
Objective:
The purpose of this study was to describe the sequential changes in commonly obtained laboratory values after coronary artery bypass grafting (CABG) with cardiopulmonary bypass (CPB).
Methods:
The authors examined laboratory data from 375 patients who underwent uncomplicated CABG with CPB in a multicenter clinical trial of a medication for postoperative pain. Data were obtained preoperatively, at the time of postoperative extubation, and at 4 subsequent intervals ending 14 days after extubation. Data obtained before study drug administration are reported for all patients; thereafter, only data from placebo patients without perioperative complications (n=123) are reported.
Results:
Mean postoperative coagulation values remained within their reference ranges at the time of extubation. However, platelet counts increased to a peak value well above the reference range by the end of the study. Postoperative white blood cell counts rose above the reference range, mainly because of increased neutrophils. Serum chemistries were also altered; most patients showed a persistent postoperative hyperglycemia. Creatine kinase levels rose to nearly 4 times the upper limit of the reference range in the early postoperative period. Lactate dehydrogenase, serum aspartate aminotransferase, and alanine aminotransferase levels also increased above the reference range. Total protein and albumin values were below the reference range throughout the postoperative period.
Conclusions:
Laboratory values for hematology, blood coagulation, and serum chemistry change substantially after uncomplicated CABG with CPB. Recognition of these changes will facilitate the conduct of clinical research and may prevent inappropriate treatment based on abnormal laboratory findings that have no clinical significance.
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