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Table 1 Preoperative rotational thromboelastometry (ROTEM) parameters

From: Rotational thromboelastometry predicts thromboembolic complications after major non-cardiac surgery

ROTEM parameter Normal values No thromboembolic complication (n =303), mean (SD) Thromboembolic complication (n =10), mean (SD) P-value AUC ROC
EXTEM
Clotting time, s 42 to 74 55.1 (31.2) 48.7 (16.9) 0.19 ---
Clot formation time, s 46 to 148 87.1 (61.7) 58.5 (16.6) <0.001 0.74
Alpha angle, degrees 63 to 81 74.3 (6.9) 78.4 (3.1) 0.002 0.70
Amplitude at 10/20 minutes, mm 50 to 69 58.2 (8.7) 64.0 (5.4) 0.008 0.72
Maximum clot firmness, mm 49 to 71 65.0 (7.5) 70.4 (5.2) 0.009 0.73
INTEM
Clotting time, s 137 to 246 171.5 (34.1) 165.8 (24.6) 0.11 ---
Clot formation time, s 71 to 82 72.2 (57.3) 51.0 (11.4) <0.001 0.75
Alpha angle, degrees 52 to 72 76.5 (5.5) 79.4 (2.4) 0.006 0.72
Amplitude at 10/20 minutes, mm 137 to 246 56.7 (7.8) 63.0 (5.8) 0.012 0.75
Maximum clot firmness, mm 52 to 72 62.8 (7.1) 68.6 (6.0) 0.02 0.74
FIBTEM
Clotting time, s 43 to 69 53.3 (47.4) 44.7 (13.1) 0.11 ---
Clot formation time, s   339.9 (366.5) 378.9 (606.0) 0.12 ---
Alpha angle, degrees   73.6 (6.6) 77.0 (5.4) 0.085 ---
Amplitude at 10/20 minutes, mm 8 to 21 16.5 (6.8) 23.7 (11.2) 0.010 ---
Maximum clot firmness, mm 9 to 25 17.8 (7.6) 24.8 (11.2) 0.015 ---
  1. For significant predictive tests, the area under the curve (AUC) of the receiver operating characteristic (ROC) curve is listed. EXTEM, extrinsic rotational thromboelastometry; INTEM, intrinsic rotational thromboelastometry; FIBTEM, fibrinogen rotational thromboelastometry; ns, not significant.