Esvaziamento gastrico de liquidos em ratos com infarto experimental do miocardio

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The Gastric Emptying (GE) is the transition of food from the stomach to the upper small intestine, and could be modify by haemodinamics changes as occur in myocardial infarction (MI). Therefore, the object of the present investigation was to study the effect of acute myocardial infarct on rat gastric emptying and the effect of bacterial lipopolysaccharide intravenous (50 and 100 µg/Kg animal weight) on gastric emptying of an isosmotic and inert liquid meal from a caloric viewpoint (saline solution) in rats with chronic myocardial infarction. We conducted a study involving male wistar rats (varying in body weight 220-250g), which were allowed to habituate in a laboratory environment and then divided into 3 groups: Group INF, rats with myocardial infarction, Group SHAM, sham rats, Group NA, was not given any anesthesia or surgical procedures. The myocardial infarction was produced by left anterior coronary artery ligation. After groups constitution animais were fasted with access to water ad libitum. 24 hours after, for the acute study and 4 weeks for the chronic study, was evaluated GE of 1,5ml/100g animal weight of a test meal of 0,9% NaCI plus the marker phenol red. GE was indirectly evaluated in conscious animals, through determining the percentage of gastric retention (%GR) of a test meal, measured 10 minutes after orogastric infusion. The resuhs of the acute study showed that animaIs from the INF group presented GR, significantly higher than the NA group but not in relation with SH group. No statistical difference in GR was observed between the SH and NA groups. And from the chronic study showed that animals which received 50 and 100P µg/kg LPS, 1 h before measure of GE presented a significantly higherpercentage of GR than control group, the same was observated SH and INF groups. Animais of NA group which received 50 and 100 µg/kg LPS 8 h before measure of GE presented a significantly higher percentage of GR than control group, as animal of SH and INF groups. No statistical difference in GR was observed between animais from 3 groups, which received saline solution or LPS. In conclusion, 1) acute myocardial infarction in rats induces delay of the gastric emptying of an isosmotic and inert liquid meal from a caloric viewpoint. 2) Animal with chronic myocardial infarction not presented alterations on GE of a saline meal. 3) Animais in these conditions, receiving 50 and 100 µg/kg, not presented high or low sensibility to endotoxin, compared with their controls.

ASSUNTO(S)

coronariopatias enfarte do miocardio gastroenterologia

ACESSO AO ARTIGO

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