• Kilsoo Yie, Soon-Ho Daniel Chon, and Chan-Young Na.
• Department of Thoracic and Cardiovascular Surgery, Cheju Halla General Hospital, Jeju, S. Korea kilsooyie@gmail.com.
• Perfusion. 2016 May 1; 31 (4): 307-15.

BackgroundWe conducted an observational study to evaluate the relationship between activated clotting time (ACT) and activated partial thromboplastin time (aPTT) tests, anticipating the possibility that the ACT will become a substitute test for the aPTT in post-CPR extracorporeal membrane oxygenation (e-CPR).Patients And MethodsThree hundred and fifteen paired ACT and aPTT samples were derived from 60 in-hospital e-CPR patients and were divided into three groups according to the observed ACT value: low level (ACT < 170 s, Group A), intended target level (ACT 170-210 s Group B) and high level (ACT > 210 s, Group C). The relationship of aPTT in each group was analyzed.ResultsThe mean ACT and aPTT values were 189.39 ± 48.27 s (IQR, 163-202) and 71.85 ± 45.32 s (IQR, 44.5-81.8), respectively. Although the observed mean ACT value of 189.39 s was similar to the intended mean target value of 190 s (p = 0.823), the observed mean aPTT value (71.85 s) was significantly lower than the predicted mean target value (77.5 s, p = 0.027). Despite the mean ACT values being significantly different in each group (p < 0.0001), the mean aPTT values were not statistically different between Groups A and B (p = 0.317). Of the Group B samples (n = 139), only 31 samples (22.3%) met the optimal therapeutic aPTT range. Pearson's correlation coefficient for Group B showed only a weak correlation between ACT and aPTT (r = 0.177; p = 0.037).ConclusionsOur study demonstrates that the ACT test alone does not seem to be enough to optimize therapeutic heparin dosage adjustment during e-CPR.© The Author(s) 2015.

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