Tabriz University of Medical Sciences Journal of Cardiovascular and Thoracic Research 2008-5117 4 2 2012 08 30 The Effect of Cyanosis on Active Clotting Time During Diagnostic Catheterization 49 52 10.5681/jcvtr.2012.012 EN Akbar Molaei Majid Malaki Shahram Sadegvand Journal Article 10.5681/jcvtr.2012.012 2012 01 30 Introduction: Cardiac catheterization is a common procedure which needs a careful coagulation monitoring. In our study, we aimed to find factors influencing active clotting time (ACT) following heparin therapy. Methods: ACT of 71 patients who were scheduled to undergo transcutaneous diagnostic catheterization and angiography were measured at baseline, 2 and 60 minutes after 50 IU/kg heparin loading. ACT in two groups of patients (cyanotic and non-cyanotic) was compared. All data were analyzed with Wilcoxon, Mann-Whitney test and Pearson in SPSS 16, P value less than 0.05 was considered significant. Results: ACT following heparin at 2nd and 60th minutes was not significantly different in cyanotic and non-cyanotic groups. At 60th minute following heparin administration, ACT decreased more dramatically in older children. Conclusion: Cyanosis does not affect ACT measures following heparin treatment. Moreover, after 60 minutes, heparin efficacy (ACT values) decreased more with increase in patients’ age.