Estudo comparativo entre solução cardioplegica cristaloide e microcardioplegia sanguinea normotermica em corações agudamente isquemico

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

Objective: There are several methods of myocardial protection. Blood solutions modified with glutamate and aspartate are increasingly being used and in the case of acute ischemia, they enhance the contractile function resuscitating the injured musc1e. The dilution recommended in the literature is approximately 25% of the hematocrit. This present study evaluates a 1% diluted normothermic blood cardioplegic solution denominated "microcardioplegia". Materiais and Methods: In this study, Large-White pigs were used as models of an isolated heart perfused by blood from the support animal. The animals were designated into three groups with seven animaIs per group (n=7) and the following treatments were applied: Control Group (CO), 8t. Thomas solution (ST), continuous normothermic blood solution (8G). After a period of stability, the following measurements were taken: systolic pressure (SP), diastolic pressure (DP), developed pressure (DP), wall stress (0"),elasticity and passive rigidity. The hearts were subjected to 30 minutes of regional ischemia by c1ampingthe anterior interventricular artery and then 90 minutes of global ischemia during which the three above specified treatments were applied. The coronary c1ampwas removed at onset of global ischemia. The hearts were once again reperfused and after three minutes of reperfusion were defibrillated whenever needed. Measurements were taken every 30 minutes for up to 90 minutes of reperfusion. Results: The SG group presented the best recovery ofventricular function in relation to the various parameters measured. The performance of the ST group was inferior to tOOtof the SG group, but was superior to the CO group with regard to some of the parameters. The need for defibrillation to reestablish heart rate was higher in the ST and CO groups. No difference was observed between the groups SG and ST with regard to percentage of weight ofhumidity, but it was higher in the CO group. Conclusion: The use of blood microcardioplegia promotes greater protection in acute ischemic hearts when compared with global ischemia or crystalloid cardioplegia. The model used in this study is very similar to the actual clinicalcondition as it utilizes blood as the perfusate

ASSUNTO(S)

sangue - circulação extracorporea isquemia coração - ventriculos

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