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ARTIGO ORIGINAL

Efeitos da pentoxifilina sobre as plaquetas e hemodinâmica de pacientes com valvopatias adquiridas, operados com circulação extracorpórea

José Manoel Tannus FilhoI; João José CarneiroI; Carlos Eli PiccinatoI; Walter Villela Andrade VicenteI; Alfredo José RodriguesI; Solange BassetoI; Albert Amin SaderI

DOI: 10.1590/S0102-76381996000300007

RESUMO

Pentoxifilina (Trental®), vasodilatador com ação reológica, foi administrada a valvopatas adquiridos (7 pacientes - 2 reoperações), antes (1.200mg v.o./dia/3 dias) e durante a operação (1 mg/kg/90 min e.v.) a fim de avaliar seus efeitos sobre as plaquetas e hemodinâmica (grupo pentoxifilina - GP) Oxigenadores de bolhas, hipotermia moderada e cardioplegia sangüínea, fria, intermitente foram usados. Hematócrito, hemoglobina, número de plaquetas e índice de agregados plaquetários circulantes, perdas sangüíneas, volume de transfusões e débito cardíaco, entre outras variáveis, foram seguidos até a 12º hora do p.o.. Os resultados foram comparados com os de um grupo controle (GC) (6 pacientes -1 reoperação) através de testes não paramétricos de Wilcoxon e Mann Whytnei). A pentoxifilina, protegendo as plaquetas, determinou melhores condições de coagulação e menor sangramento p.o. Entretanto, seu efeito vasodilatador foi reduzido ou nulo, sem nenhum benefício para a circulação periférica, resistência vascular sistêmica e débito cardíaco.

ABSTRACT

Pentoxifylline (Trental ®), vasodilator with rheologic action, was administered to patients with acquired valvopathies (7 pt - 2 reoperations) before (1,200 mg p/day/3 days) and during the surgery (1 mg/kg/90 min, i.v.) to evaluate its effects on the platelets and hemodynamic. Bubble oxygenators, moderate hypothermia and intermittent cold blood cardioplegia were used. Hematocrit, hemoglobin, circulating platelets and aggregate platelets index, blood loss and transfusion and cardiac output were followed among other variables till the 12th post-op. hour. They were compared with a control group (6 pt - 1 reoperation) by non parametric tests of Wilcoxon and Mann Whitney. Pentoxifylline, protecting the platelets, has determined better conditions of coagulation and small post-op bleeding. However, its vasodilator effect was reduced or absent, without any benefit on the periferic circulation, systemic vascular resistance and cardiac output.
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