[Enalapril prevents myocardial remodeling in rats with arteriovenous fistula].
OBJECTIVE
To evaluate the efficacy of enalapril in preventing cardiac myocyte remodelling in rats with arteriovenous fistulas.


METHODS
We distributed thirty males Wistar rats in 3 groups: group A (control), group B (fistula) and group C (fistula + enalapril). An end to side fistula between the femoral artery and vein was produced in the right thighs of rats from groups B and C. Oral enalapril (0.07 mg/kg/day) was given to rats from group C. After 8 weeks the rats were sacrificed and their heart removed for pathologic study.


RESULTS
Body weight evolution was similar in all groups. Heart weight increased in group B (1.78 +/- 0.2 g) when compared to group A (1.55 +/- 0.11 g), (p < 0.02), and was similar (p = n.s.) in groups A and C (1.58 +/- 0.13 g). Heart weight/Body weight ratio was also increased in group B (4.4 +/- 0.55 mg/g) when compared to group A (3.6 +/- 0.5 mg/g), (p < 0.01), but was similar in groups A and C (3.66 +/- 0.4 mg/g) (p = n.s.). An increase in wall thickness was detected in group B in the right ventricle (p < 0.03), septum (p < 0.01) and left ventricle (p < 0.01) when compared to groups A and C. Myocytes cytoplasm volume fraction was increased in group B, when compared with group A, in all segments studied (right ventricle p = 0.011, septum p = 0.025, and left ventricle p = 0.031). Groups A and C were similar.


CONCLUSIONS
Enalapril prevents the structural remodelling of cardiac myocytes in this model of volume overload induced by an arteriovenous fistula.
Gonçalves
L
L
Serviço de Cardiologia dos Hospitais da Universidade de Coimbra.
Pacheco
F
F
Santos
C
C
Cabrita
S
S
Beja
M
M
Providência
L A
LA
D000818:Animals; D001164:Arteriovenous Fistula / Q000150:complications / Q000503:physiopathology; D002306:Cardiac Volume; D006332:Cardiomegaly / Q000209:etiology / Q000473:pathology / Q000517:prevention & control*; D004656:Enalapril / Q000494:pharmacology* / Q000627:therapeutic use; D006321:Heart / Q000187:drug effects* / Q000254:growth & development*; D008297:Male; D009206:Myocardium / Q000473:pathology; D051381:Rats; D017208:Rats, Wistar
D004656:Enalapril
O enalapril previne a remodelação miocárdica em ratos com fístula arteriovenosa.