Introduction: The recently recommended activated clotting time (ACT) to be maintained at the initiation of and during cardiopulmonary bypass (CPB) is ≥480 s. However, the post-unfractionated heparin (UFH) administration ACT occasionally does not exceed 480 s. Therefore, in this study, we retrospectively evaluated the factors influencing post-heparin administration ACT before initiating CPB.
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