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APTT values with regard to heparin concentration used for catheter canal locking. (*Baseline APTT vs. APTT 2 h after catheter insertion p < 0.001, ##comparison of APTT 2 h after catheter insertion HCH vs. LCH p < 0.001). APTT activated partial thromboplastin time, HCH high concentration of heparin, LCH low concentration of heparin
