RESUMO
OBJECTIVE: The Perceval S bioprosthesis (LivaNova PLC, London, United Kingdom) is based on the Freedom Solo aortic bioprosthesis (LivaNova PLC), which has been reported to be associated with perioperative thrombocytopenia. We compared platelet counts after aortic valve replacement with the Perceval S with those with other aortic valve bioprostheses. METHODS: A total of 87 patients receiving aortic valve replacement were included in this retrospective study; 25 patients received the Perceval S, 23 patients received the Labcor TLPB-A (Labcor, Belo Horizonte, Brazil), and 39 patients received the Hancock II bioprosthesis (Medtronic, Minneapolis, Minn). Thrombocyte count was corrected for hematocrit. Multivariable analyses were performed to assess the potential effect of other variables. RESULTS: Preoperatively, there were no differences in platelet counts comparing the Perceval S group (median 200/nl, interquartile range, 157-252) and the control group (Labcor: median 213/nl, interquartile range, 160-246, Hancock: median 227/nl, interquartile range, 183-280, P = .23). Postoperatively, there was significant evidence that the minimum platelet count (median, Perceval: 47, interquartile range, 38-66; Labcor: 76, interquartile range, 61-110; Hancock: 78, interquartile range, 61-111/nl; P = .001), both absolute and corrected, was lower for the Perceval S, even after allowing for other variables. The significant difference in absolute platelet counts persisted until discharge or death. However, there were no significant differences regarding blood loss, transfusion requirements, or rates of reoperation for bleeding. CONCLUSIONS: After aortic valve replacement, platelet counts in patients with the Perceval S decrease more severely compared with other bioprostheses, but in our small study we found no evidence of a detrimental clinical effect of this phenomenon. Future studies have to confirm our findings and investigate a cause for this phenomenon.
