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Patients undergoing coronary artery bypass graft (CABG) surgery or carotid endarterectomy (CEA) continue antiplatelet therapy perioperatively, which may increase bleeding risk. We aimed to investigate whether Rotational thromboelastometry (ROTEM ® )  platelet,  a newly marketed platelet function analysis, would detect antiplatelet therapy in CABG and CEA patients; whether detection of reduced platelet function was associated with increased bleeding; and whether  ex vivo  desmopressin increased platelet function. We included 20 CABG patients continuing aspirin and 20 CEA patients continuing clopidogrel ( n  = 1) or clopidogrel and aspirin ( n  = 19). Platelet function was analyzed with ROTEM ®platelet  and light transmission aggregometry (LTA). According to the lower reference limit, ROTEM ®platelet  managed to detect aspirin, but clopidogrel detection was inadequate compared to LTA. Using a previously published cut-off for bleeding risk, 6 (30%) patients receiving aspirin and 4 (21%) patients receiving both clopidogrel and aspirin demonstrated platelet function below this cut-off. One of the four CEA patients below the cut-off died from intracerebral hemorrhage postoperatively. CABG patients below ( n  = 6) and above ( n  = 14) the cut-off did not differ in chest tube output (median [range]: 373 ml [250–900]  vs . 368 ml [195–820]).  Ex vivo  addition of desmopressin did not increase platelet function. In conclusion, ROTEM ®platelet  does reveal aspirin treatment whereas clopidogrel treatment is most often overlooked. Due to low bleeding in the study population, it was not possible to conclude on the association with bleeding risk.

Platelet function assessed by ROTEM ® platelet in patients receiving antiplatelet therapy during cardiac and vascular surgery