Hemodynamic changes and autonomic nervous system after acute myocardial infarction in rats submitted to left coronary artery ligation

Autores

  • Daniela Meirelles Nascimento Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS). Porto Alegre, RS, Brasil. Instituto Porto Alegre. Porto Alegre, RS, Brasil.
  • Beatriz D'Agord Schaan Serviço de Endocrinologia, Hospital de Clínicas de Porto Alegre (HCPA), Universidade Federal do Rio Grande do Sul (UFRGS). Porto Alegre, RS, Brasil.
  • Adriane Belló-Klein Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS). Porto Alegre, RS, Brasil.
  • Pedro Dal Lago Laboratório de Fisiologia Cardiovascular, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA). Porto Alegre, RS, Brasil.
  • Maria Cláudia Irigoyen Unidade de Hipertensão, Instituto do Coração, Universidade de São Paulo (USP). São Paulo, SP, Brasil.

Palavras-chave:

Heart failure, myocardial infarction, heart rate variability

Resumo

Introduction: Heart failure is a clinical syndrome characterized by sympathetic/ renin-angiotensin system activation, besides parasympathetic activity attenuation. In the initial phase of HF, following a myocardial infarction, there is impairment of the ventricular function and this can be influenced by the myocardium ischemia area in addition to alteration in the autonomic control of the heart. The aim of this study is to evaluate the hemodynamic responses and autonomic nervous system and its associations in infarcted rats by left coronary artery ligation.

Methods: Forty male rats were submitted to left coronary artery ligation: infarcted animals with fifteen days from cardiac surgery (I15), infarcted animals with thirty days from cardiac surgery (I30) and sham-operated groups (S15 and S30), with 10 animals in each group. Basal hemodynamic data and heart rate variability (spectral analysis) were evaluated.

Results: Compared to control groups, the infarcted rats demonstrated the following complications: a) cardiac hypertrophy (I30); b) pulmonary congestion (I30); c) mean arterial pressure (MAP), systolic arterial pressure (SAP) and diastolic arterial pressure (DAP) reduction; d) left ventricular systolic pressure (LVSP) reduction and left ventricular end-diastolic pressure (LVEDP) rise; e) contractile (+dP/dt) and relaxation derivatives (-dP/dt) reduction; f) sympathetic cardiac activity increase, and parasympathetic cardiac activity reduction (I30).

Conclusion: Our study shows that the infarcted animals presented left ventricular dysfunction, which was influenced by the infarct size. In addition, impairment of autonomic control was present only in the animals belonging to the I30 group, probably due to the degree of cardiac decompensation and disease progression.

Keywords: Heart failure; myocardial infarction; heart rate variability

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Publicado

2018-07-19

Como Citar

1.
Nascimento DM, Schaan BD, Belló-Klein A, Dal Lago P, Irigoyen MC. Hemodynamic changes and autonomic nervous system after acute myocardial infarction in rats submitted to left coronary artery ligation. Clin Biomed Res [Internet]. 19º de julho de 2018 [citado 27º de junho de 2022];38(2). Disponível em: https://seer.ufrgs.br/index.php/hcpa/article/view/79507

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