Every Second Counts: The Race to Transplant the First Human Heart, Donald McRae, New York: Penguin (Berkley/Putnam), 2006, Ch. 7 "Mississippi Gambling", pp. 123–27. This source states the heartbeat for approximately one hour.
Hardy James D.; Chavez Carlos M.; Kurrus Fred D.; Neely William A.; Eraslan Sadan; Turner M. Don; Fabian Leonard W.; Labecki Thaddeus D. (1964). "Heart Transplantation in Man". JAMA. 188 (13). doi:10.1001/jama.1964.03060390034008.
Cooper DK (2012). "A brief history of cross-species organ transplantation". Proc (Bayl Univ Med Cent). 25 (1): 49–57. doi:10.1080/08998280.2012.11928783. PMC3246856. PMID22275786. ' … the consent form for Hardy's operation – which, in view of the patient's semi-comatose condition, was signed by a close relative – stipulated that no heart transplant had ever been performed, but made no mention of the fact that an animal heart might be used for the procedure. Such was the medicolegal situation at that time that this "informed" consent was not considered in any way inadequate. . '
Raffa, G.M.; Pellegrini, C.; Viganò, M. (November 2010). "Domino Heart Transplantation: Long-Term Outcome of Recipients and Their Living Donors: Single Center Experience". Transplantation Proceedings. 42 (9): 3688–93. doi:10.1016/j.transproceed.2010.09.002. PMID21094839.
Kwon, JH; Usry, B; Hashmi, ZA; Bhandari, K; Carnicelli, AP; Tedford, RJ; Welch, BA; Shorbaji, K; Kilic, A (28 July 2023). "Donor utilization in heart transplant with donation after circulatory death in the United States". American Journal of Transplantation. doi:10.1016/j.ajt.2023.07.019. PMID37517554. S2CID260296589.
Sef, D; Mohite, P; De Robertis, F; Verzelloni Sef, A; Mahesh, B; Stock, U; Simon, A (September 2020). "Bridge to heart transplantation using the Levitronix CentriMag short-term ventricular assist device". Artificial Organs. 44 (9): 1006–1008. doi:10.1111/aor.13709. PMID32367538. S2CID218506853.
de Jonge, N.; Kirkels, J. H.; Klöpping, C.; Lahpor, J. R.; Caliskan, K.; Maat, A. P. W. M.; Brügemann, J.; Erasmus, M. E.; Klautz, R. J. M.; Verwey, H. F.; Oomen, A.; Peels, C. H.; Golüke, A. E. J.; Nicastia, D.; Koole, M. A. C. (2008). "Guidelines for heart transplantation". Netherlands Heart Journal. 16 (3): 79–87. doi:10.1007/BF03086123. ISSN1568-5888. PMC2266869.
Cooper DK (2012). "A brief history of cross-species organ transplantation". Proc (Bayl Univ Med Cent). 25 (1): 49–57. doi:10.1080/08998280.2012.11928783. PMC3246856. PMID22275786. ' … the consent form for Hardy's operation – which, in view of the patient's semi-comatose condition, was signed by a close relative – stipulated that no heart transplant had ever been performed, but made no mention of the fact that an animal heart might be used for the procedure. Such was the medicolegal situation at that time that this "informed" consent was not considered in any way inadequate. . '
Raffa, G.M.; Pellegrini, C.; Viganò, M. (November 2010). "Domino Heart Transplantation: Long-Term Outcome of Recipients and Their Living Donors: Single Center Experience". Transplantation Proceedings. 42 (9): 3688–93. doi:10.1016/j.transproceed.2010.09.002. PMID21094839.
Kwon, JH; Usry, B; Hashmi, ZA; Bhandari, K; Carnicelli, AP; Tedford, RJ; Welch, BA; Shorbaji, K; Kilic, A (28 July 2023). "Donor utilization in heart transplant with donation after circulatory death in the United States". American Journal of Transplantation. doi:10.1016/j.ajt.2023.07.019. PMID37517554. S2CID260296589.
Sef, D; Mohite, P; De Robertis, F; Verzelloni Sef, A; Mahesh, B; Stock, U; Simon, A (September 2020). "Bridge to heart transplantation using the Levitronix CentriMag short-term ventricular assist device". Artificial Organs. 44 (9): 1006–1008. doi:10.1111/aor.13709. PMID32367538. S2CID218506853.
Cooper DK (2012). "A brief history of cross-species organ transplantation". Proc (Bayl Univ Med Cent). 25 (1): 49–57. doi:10.1080/08998280.2012.11928783. PMC3246856. PMID22275786. ' … the consent form for Hardy's operation – which, in view of the patient's semi-comatose condition, was signed by a close relative – stipulated that no heart transplant had ever been performed, but made no mention of the fact that an animal heart might be used for the procedure. Such was the medicolegal situation at that time that this "informed" consent was not considered in any way inadequate. . '
de Jonge, N.; Kirkels, J. H.; Klöpping, C.; Lahpor, J. R.; Caliskan, K.; Maat, A. P. W. M.; Brügemann, J.; Erasmus, M. E.; Klautz, R. J. M.; Verwey, H. F.; Oomen, A.; Peels, C. H.; Golüke, A. E. J.; Nicastia, D.; Koole, M. A. C. (2008). "Guidelines for heart transplantation". Netherlands Heart Journal. 16 (3): 79–87. doi:10.1007/BF03086123. ISSN1568-5888. PMC2266869.
Ludhwani, Dipesh; Fan, Ji; Kanmanthareddy, Arun (2020). "Heart Transplantation Rejection". StatPearls [Internet]. PMID30725742. Retrieved 25 June 2020 – via NCBI Bookshelf. Last Update: December 23, 2019.
Kwon, JH; Usry, B; Hashmi, ZA; Bhandari, K; Carnicelli, AP; Tedford, RJ; Welch, BA; Shorbaji, K; Kilic, A (28 July 2023). "Donor utilization in heart transplant with donation after circulatory death in the United States". American Journal of Transplantation. doi:10.1016/j.ajt.2023.07.019. PMID37517554. S2CID260296589.
Sef, D; Mohite, P; De Robertis, F; Verzelloni Sef, A; Mahesh, B; Stock, U; Simon, A (September 2020). "Bridge to heart transplantation using the Levitronix CentriMag short-term ventricular assist device". Artificial Organs. 44 (9): 1006–1008. doi:10.1111/aor.13709. PMID32367538. S2CID218506853.
de Jonge, N.; Kirkels, J. H.; Klöpping, C.; Lahpor, J. R.; Caliskan, K.; Maat, A. P. W. M.; Brügemann, J.; Erasmus, M. E.; Klautz, R. J. M.; Verwey, H. F.; Oomen, A.; Peels, C. H.; Golüke, A. E. J.; Nicastia, D.; Koole, M. A. C. (2008). "Guidelines for heart transplantation". Netherlands Heart Journal. 16 (3): 79–87. doi:10.1007/BF03086123. ISSN1568-5888. PMC2266869.
Major Medical Milestones Leading Up To the First Human Heart Transplantation, Kate Elzinga, from Proceedings of the 18th Annual History of Medicine Days Conference 2009: The University of Calgary Faculty of Medicine, Alberta, Canada, Cambridge Scholars Publishing, 2011. " . . following Barnard's landmark heart transplantation on December 3, 1967, 107 human heart transplants were performed by 64 surgical teams in 24 countries in 1968. . "
de Jonge, N.; Kirkels, J. H.; Klöpping, C.; Lahpor, J. R.; Caliskan, K.; Maat, A. P. W. M.; Brügemann, J.; Erasmus, M. E.; Klautz, R. J. M.; Verwey, H. F.; Oomen, A.; Peels, C. H.; Golüke, A. E. J.; Nicastia, D.; Koole, M. A. C. (2008). "Guidelines for heart transplantation". Netherlands Heart Journal. 16 (3): 79–87. doi:10.1007/BF03086123. ISSN1568-5888. PMC2266869.