Associação do trimetazidine a diferentes metodos de proteção miocardica : estudo experimental em porcos / Association of Trimetazidine to different methods of cardioplegia : experimental study on swines

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Introduction: Many drugs have usually been associated to cardioplegia since beggining of myocardial protection in Cardiac Surgery in order to improve surgical outcome. Any medicine able to induce resistance to ischemia and better hemodinamic effects and survival may have its utilization justified. Trimetazidine is an agent currently available as anti-ischemic medicine for anginal symptoms acting by protective metabolic effects Its role to be used in heart surgical patients as an adjuvant to cardioplegia is yet not fully comprehended. Objective: Verify in an isolated working heart state animal model if the association of trimetazidine to cardioplegia improves heart performance. Materials and method: Swines were used in this working heart model. They were divided in three grups (n = 6) that underwent regional and global ischemia. Each group was selected to a different treatment. St Thomas Cardioplegia (ST), St Thomas associated to trimetazidine (TMZ) and control group (Co). Data was collected during reperfusion period at 30, 60 and 90 minutes and were measured: Hemodinamic parameters such as elastance contractility index (Emáx), preload recruitable stroke work relationship (PRSW) and heart "stiffness" (EDPRV). Other data included coronary flow, oxygen and glucose consumption and lactate. Results were statistically analysed. Results: All contractility data were not significantly different among three groups. Lactate became constantly higher according to time uniformly in all three groups Coronary flow, glucose consumption and oxygen consumption presented large variations during time periods but according to treatments showed no statistical differences in all three groups. Left ventricle final weight was significantly lower in trimetazidine group compared to both other groups. Conclusion: Acute administration of trimetazidine associated to cardioplegia as an adjuvant showed no hemodinamic or metabolic improvement in an isolated working heart experimental model in swines. Key-words: Trimetazidine; isolated working heart model; cardioplegia

ASSUNTO(S)

cardioplegic solutions ischemia soluções cardioplegicas isquemia metabolism metabolismo

ACESSO AO ARTIGO

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