IJCS | Volume 33, Nº3, May / June 2020

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PA: Churchill Livingstone; 2003:p.67-132. 22. Baugham DR, Woodward PM. A collaborative study of heparin from different sources. Bull Wid Hith Org.1970; 42(1):129-49. 23. Fiser WP, Read RC, Wright FE, Vecchio TJ. A randomized study of beef lung and pork mucosal heparin in cardiac surgery. Ann Thorac Surg. 1983;35(6):615-20. 24. Effeney DJ, Goldstone J, Chin D, Krupski WC, Ellis RJ. Intraoperative anticoagulation in cardiovascular surgery. Surgery. 1981;90(6):1068-74. 25. Sklehan TM, Heflin DW. Optimal ACT sampling interval in pediatric and adult patients after systemic heparinization. Anesthesiology. 1989;71(Suppl 3A):289. References Lima et al. Unfractionated bovine heparin safety Int J Cardiovasc Sci. 2020; 33(3):235-242 Original Article Torres ACB, Cordeiro TMG. Statistical analysis: Torres FAL. Obtaining financing: Torres FAL. Writing of the manuscript: Torres FAL, Torres ACB, Cordeiro TMG. Critical revision of themanuscript for intellectual content: Torres FAL, Cordeiro TMG. Potential Conflict of Interest No potential conflict of interest relevant to this article was reported. Sources of Funding There were no external funding sources for this study. Study Association This study is not associated with any thesis or dissertation work. Ethics approval and consent to participate This study was approved by the Ethics Committee of the Faculdade Sant´Ana – Ponta Grossa, PR under the protocol number 1844221/2016. All the procedures in this study were in accordance with the 1975 Helsinki Declaration, updated in 2013. Informed consent was obtained from all participants included in the study.