Abstract
This study investigated the effects of fosinopril on the electrophysiological characteristics of the left ventricular hypertrophic myocardium in spontaneously hypertensive rats (SHRs). Twenty-four 10-week-old male SHRs were divided into fosinopril and non-fosinopril groups (n = 12 each). Twelve 10-week-old Wistar-Kyoto rats were used a control group. Left ventricular mass index and ventricular fibrillation threshold (VFT) were measured after 8 weeks of fosinopril or saline treatment. L-type calcium current (I CaL), sodium current (I Na), and transient outward potassium current (I to) were measured in left ventricular myocytes after 8 weeks of fosinopril or saline treatment using the whole-cell patch-clamp technique. VFT was higher in the fosinopril group than in the non-fosinopril group (17.5 ± 1.2 mA vs. 15.6 ± 1.1 mA, P < 0.01). The density of I CaL was lower in the fosinopril group than in the non-fosinopril group (-7.17 ± 0.13 pA/pF vs. -7.87 ± 0.13 pA/pF, P < 0.05). The density of I to was higher in the fosinopril group than in the non-fosinopril group (14.46 ± 0.28 pA/pF vs. 12.66 ± 0.25 pA/pF, P < 0.05). I to was positively correlated with VFT (r = 0.90, P < 0.001) and was found to be associated independently with VFT (P < 0.001). Fosinopril improves the electrophysiological characteristics of the left ventricular hypertrophic myocardium in SHRs.
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