Related Experiment Videos
Platelet function tests predict bleeding and thrombotic events after off-pump coronary bypass grafting
Robert Poston1, Junyan Gu, Jeffrey Manchio
1Division of Cardiac Surgery, Department of Surgery, School of Medicine, University of Maryland, N4W94 22 S. Greene St., Baltimore, MD 21201, USA. rposton@smail.umaryland.edu
Summary
Platelet function tests, not standard coagulation tests, predict bleeding and thrombosis after off-pump coronary artery bypass (OPCAB) surgery. Monitoring and adjusting platelet function may reduce complications without increasing bleeding risk.
Area of Science:
- Cardiovascular Surgery
- Hemostasis and Thrombosis
- Anesthesiology
Background:
- Maintaining coagulation balance is crucial after cardiac surgery to prevent bleeding and thrombotic events.
- Current methods for monitoring coagulation balance post-cardiac surgery are not definitively established.
- Off-pump coronary artery bypass (OPCAB) surgery presents unique challenges in managing hemostasis.
Purpose of the Study:
- To evaluate the utility of various coagulation and platelet function tests in predicting bleeding and thrombotic events after OPCAB.
- To define the association between perioperative coagulation status and clinical outcomes.
- To compare the predictive value of standard coagulation tests versus advanced platelet function assays.
Main Methods:
- Seventy-six patients undergoing OPCAB were monitored perioperatively and on days 1 and 3 post-surgery.
- Coagulation status was assessed using routine tests (prothrombin time, fibrinogen, d-dimer, platelet count), thrombelastography, and whole blood aggregometry.
- Blood loss was quantified, and early venous bypass graft patency was evaluated using CT angiography.
Main Results:
- Routine coagulation tests did not correlate with bleeding or thrombosis.
- Perioperative decline in platelet function, measured by aggregometry, correlated with intraoperative blood loss (R=0.42, P<0.05).
- Reduced thrombelastography maximum amplitude correlated with 24-hour hemoglobin loss (R=0.45, P<0.05). Patients with graft failure showed reduced platelet sensitivity to aspirin.
Conclusions:
- Platelet function monitoring, unlike standard coagulation tests, effectively predicts bleeding and thrombosis post-OPCAB.
- Titrating perioperative platelet function based on these advanced tests holds potential for minimizing thrombotic complications without increasing bleeding risk.