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Gastric Emptying and Gastrointestinal Transit of Liquid in Awake Rats Is Delayed After Acute Myocardial Infarction

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Abstract

The outcome of acute myocardial infarction (AMI) on gastrointestinal motor behavior was assessed in awake rats. Under anesthesia, they were submitted to thoracotomy followed or not by occlusion of the left coronary artery. Next day, they were gavage fed (1.5 ml) with phenol red in 5% glucose solution and sacrificed 10, 20, or 30 min later. Each subset consisted of 7 to 19 animals. Dye recovery in the stomach, proximal, mid, and distal small intestine was obtained by spectrophotometry. Infarcted left ventricle plus septum area was about 48.9 ± 2.8, 55.1 ± 6.7, and 54.1 ± 8.1% (respectively, for 10-, 20-, and 30-min subsets). AMI increased gastric dye retention by 25.5, 51.3, and 65.1% (respectively, for 10-, 20-, and 30-min subsets), while it decreased mid small intestine retention at 30 min (45.3%) as well as distal retention at 10 min (90.5%) and 20 min (90%). A positive correlation (r S =0.64) was found between infarcted area and gastric retention values at 10 min. AMI also increased (P < 0.05) central venous pressure values in all subsets (3.8 ± 0.2 vs. −2.1 ± 1.5, 1.4 ± 0.1 vs. 0.5 ± 0.2, and 1.6 ± 0.4 vs. −0.2 ± 0.3 cm H2O), while it decreased (P < 0.05) mean arterial pressure (95.0 ± 2.6 vs. 110.0 ± 3.9 and 106.0 ± 2.0 vs. 113.0 ± 3.0 mm Hg, respectively, at 10 and 30 min), and increased (P < 0.05) the 10-min heart rate values (429.6 ± 11.3 vs. 374.0 ± 19.8 bpm). Omeprazole pretreatment did not alter this phenomenon. In another group of rats, cardiac chemoreflex stimulation by i.v. phenylbiguanide increased gastric dye retention by 51.1%. In conclusion, AMI delays the gastric emptying and gastrointestinal transit of liquid in awake rats.

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Authors and Affiliations

  1. The Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil

    Flávio Duarte Camurça, Dário Augusto Ferreira De Queiroz, Paulo Roberto Lacerda Leal, Cleonísio Leite Rodrigues, Francisco De Assis Aquino Gondim, José Ronaldo Vasconcelos Da Graça, Francisco Hélio Rola, Miguel Angelo Nobre E Souza & Armenio Aguiar Dos Santos

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  1. Flávio Duarte Camurça
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  2. Dário Augusto Ferreira De Queiroz
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  3. Paulo Roberto Lacerda Leal
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  4. Cleonísio Leite Rodrigues
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  9. Armenio Aguiar Dos Santos
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Camurça, F.D., Queiroz, D.A.F.D., Leal, P.R.L. et al. Gastric Emptying and Gastrointestinal Transit of Liquid in Awake Rats Is Delayed After Acute Myocardial Infarction. Dig Dis Sci 49, 757–762 (2004). https://doi.org/10.1023/B:DDAS.0000030085.17586.06

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