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Pulmonary morphofunctional effects of acute myocardial infarction

DS Faffe, PS Chagas, AS Medeiros, EA Saad, PH Saldiva, PR Rocco, WA Zin
European Respiratory Journal 1999 14: 751-758; DOI:
DS Faffe
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PS Chagas
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AS Medeiros
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EA Saad
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PH Saldiva
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PR Rocco
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WA Zin
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Abstract

Acute myocardial infarction (AMI) may yield several respiratory changes. Nevertheless, no comprehensive pulmonary morphological/physiological correlation has been performed under this condition. The aims of the present investigation were: 1) to determine the respiratory parameters in an experimental model of coronary artery occlusion, 2) to relate these results to findings from lung histopathology, and 3) to evaluate the effects of propranolol used prior to AMI. Twenty-eight rats were anaesthetized and mechanically ventilated. In the control group (C), a suture line was passed around the left anterior descending coronary artery (LADCA). The infarct group (I) was similarly prepared but the LADCA was ligated and infarct resulted. In the control/propranolol (CP) and infarct/propranolol (IP) groups, propranolol was intravenously injected 5 min before surgery as performed in groups C and I, respectively. Lung static (EL,st) and dynamic (EL,dyn) elastances, airway resistance (RL,int), and viscoelastic/inhomogeneous pressure (deltaP2L) were determined before and 30, 60 and 120 min after surgery. In group I, EL,st, EL,dyn, RL,int and deltaP2L increased progressively throughout the experiment, and were higher than those found in groups C, CP and IP. All respiratory parameters but EL,st remained unaltered in group IP. Lung histopathological examination demonstrated alveolar, interstitial and intrabronchial oedema in group I. Group IP showed only interstitial oedema. Acute myocardial infarction yields lung resistive, elastic and viscoelastic changes. The last two results from alveolar and interstitial oedema, respectively. The previous use of propranolol diminishes respiratory changes.

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Pulmonary morphofunctional effects of acute myocardial infarction
DS Faffe, PS Chagas, AS Medeiros, EA Saad, PH Saldiva, PR Rocco, WA Zin
European Respiratory Journal Oct 1999, 14 (4) 751-758;

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Pulmonary morphofunctional effects of acute myocardial infarction
DS Faffe, PS Chagas, AS Medeiros, EA Saad, PH Saldiva, PR Rocco, WA Zin
European Respiratory Journal Oct 1999, 14 (4) 751-758;
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