Premium
Isoproterenol‐Induced Hypertrophy May Result In Distinct Left Ventricular Changes
Author(s) -
Murad Neif,
Tucci Paulo Jf
Publication year - 2000
Publication title -
clinical and experimental pharmacology and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 103
eISSN - 1440-1681
pISSN - 0305-1870
DOI - 10.1046/j.1440-1681.2000.03254.x
Subject(s) - ventricle , muscle hypertrophy , medicine , cardiology , myocardial hypertrophy , myocardial fibrosis , diastole , left ventricular hypertrophy , isoprenaline , homogeneous , fibrosis , endocrinology , blood pressure , stimulation , mathematics , combinatorics
SUMMARY 1. The aim of the present study was to analyse the possible lack of uniformity in isoproterenol (ISO)‐induced myocardial hypertrophy. 2. Data obtained for isovolumic hearts isolated from 20 rats treated with ISO (0.3 mg/kg over 8 days) were divided into two groups (H 1 , n = 10; H 2 , n = 10) according to the volume (mean±SD) needed to change left ventricle diastolic pressure from 0 to 40 mmHg (H 1 , 184±30 μL; H 2 , 108±14 μL). Eight control rats (C; 165±37 μL) were used for comparison. 3. In addition to ventricular distensibility differences, the groups differed in terms of myocardial mass (mean±SEM: H 1 , 181±3 mg > H 2 , 166±3 mg > C, 136±3 mg; P < 0.001), of relaxation constant (H 2 , 43±4 msec > H 1 , 28±2 msec; P = 0.0012) and of maximum developed circumferential stress (C, 145±9 kdyn/cm 2 = H 1 , 137±6 kdyn/cm 2 > H 2 , 110±4 kdyn/cm 2 ; P = 0.002). 4. Our results show that ISO‐induced myocardial hypertrophy is not homogeneous. Data obtained for H 2 , taken as a whole and compared with H 1 (smaller myocardial mass and impairment of relaxation, elastic stiffness and force generation), suggest that, in some animals, myocardial necrosis and reparative fibrosis may prevail over the stimulus for myocyte growth. The lack of uniformity of ISO‐induced myocardial hypertrophy has not been previously reported and may have contributed to the divergence observed in the literature regarding the functional characteristics of the present model.