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Food restriction induces in vivo ventricular dysfunction in spontaneously hypertensive rats without impairment of in vitro myocardial contractility
Okoshi, K; Fioretto, J. R; Okoshi, M. P; Cicogna, A. C; Aragon, F. F; Matsubara, L. S; Matsubara, B. B.
Afiliación
  • Okoshi, K; Universidade Estadual Paulista. Faculdade de Medicina de Botucatu. Departamento de Clínica Médica. Botucatu. BR
  • Fioretto, J. R; Universidade Estadual Paulista. Faculdade de Medicina de Botucatu. Departamento de Pediatria. Botucatu. BR
  • Okoshi, M. P; Universidade Estadual Paulista. Faculdade de Medicina de Botucatu. Departamento de Clínica Médica. Botucatu. BR
  • Cicogna, A. C; Universidade Estadual Paulista. Faculdade de Medicina de Botucatu. Departamento de Clínica Médica. Botucatu. BR
  • Aragon, F. F; Universidade Estadual Paulista. Faculdade de Medicina de Botucatu. Departamento de Clínica Médica. Botucatu. BR
  • Matsubara, L. S; Universidade Estadual Paulista. Faculdade de Medicina de Botucatu. Departamento de Clínica Médica. Botucatu. BR
  • Matsubara, B. B; Universidade Estadual Paulista. Faculdade de Medicina de Botucatu. Departamento de Clínica Médica. Botucatu. BR
Braz. j. med. biol. res ; 37(4): 607-613, Apr. 2004. tab, graf
Article en En | LILACS | ID: lil-357107
Biblioteca responsable: BR1.1
ABSTRACT
Cardiac structures, function, and myocardial contractility are affected by food restriction (FR). There are few experiments associating undernutrition with hypertension. The aim of the present study was to analyze the effects of FR on the cardiac response to hypertension in a genetic model of hypertension, the spontaneously hypertensive rat (SHR). Five-month-old SHR were fed a control or a calorie-restricted diet for 90 days. Global left ventricle (LV) systolic function was evaluated in vivo by transthoracic echocardiogram and myocardial contractility and diastolic function were assessed in vitro in an isovolumetrically beating isolated heart (Langendorff preparation). FR reduced LV systolic function (control (mean ± SD) 58.9 ± 8.2; FR 50.8 ± 4.8 percent, N = 14, P < 0.05). Myocardial contractility was preserved when assessed by the +dP/dt (control 3493 ± 379; FR 3555 ± 211 mmHg/s, P > 0.05), and developed pressure (in vitro) at diastolic pressure of zero (control 152 ± 16; FR 149 ± 15 mmHg, N = 9, P > 0.05) and 25 mmHg (control 155 ± 9; FR 150 ± 10 mmHg, N = 9, P > 0.05). FR also induced eccentric ventricular remodeling, and reduced myocardial elasticity (control 10.9 ± 1.6; FR 9.2 ± 0.9 percent, N = 9, P < 0.05) and LV compliance (control 82.6 ± 16.5; FR 68.2 ± 9.1 percent, N = 9, P < 0.05). We conclude that FR causes systolic ventricular dysfunction without in vitro change in myocardial contractility and diastolic dysfunction probably due to a reduction in myocardial elasticity.
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Texto completo: 1 Colección: 01-internacional Base de datos: LILACS Asunto principal: Inanición / Disfunción Ventricular Izquierda / Contracción Miocárdica Límite: Animals Idioma: En Revista: Braz. j. med. biol. res Asunto de la revista: BIOLOGIA / MEDICINA Año: 2004 Tipo del documento: Article / Project document País de afiliación: Brasil Pais de publicación: Brasil
Texto completo
Añadir a Mi BVS
Imprimir
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Texto completo: 1 Colección: 01-internacional Base de datos: LILACS Asunto principal: Inanición / Disfunción Ventricular Izquierda / Contracción Miocárdica Límite: Animals Idioma: En Revista: Braz. j. med. biol. res Asunto de la revista: BIOLOGIA / MEDICINA Año: 2004 Tipo del documento: Article / Project document País de afiliación: Brasil Pais de publicación: Brasil