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• W2022786902 abstract "Left ventricular (LV) performance of the pharmacologically regressed heart in hypertension is still unclear. We compared LV function of the heart regressed by nifedipine with that of the hypertrophied heart in spontaneously hypertensive rats (SHR). Nifedipine (30 mg/kg/day in food) was given to 15-week-old male SHR for 20 weeks (n=12). Age- and sex-matched SHR served as controls (n=12). LV catheterization was performed using a micromanometer and cardiac output was determined by the thermodilution method. Hemodynamic studies were performed after washout of nifedipine (24 h), when blood pressure had returned to the untreated level. Peak pumping ability was assessed during acute volume loading with saline, Nifedipine significantly decreased blood pressure in conscious animals (222±11 to 201±12 mmHg, p<0.01) and reduced LV weight (1.20±0.07 to 1.07±0.05g, p<0.01). After washout of nifedipine, LV systolic and end-diastolic pressures, dp/dtmax and cardiac output determined under pentobarbital anesthesia were similar in the treated and untreated groups. Peak pumping ability during acute preload elevation was also similar in the 2 groups. Plasma norepinephrine was unaltered, and plasma renin activity was significantly lower in the treated rats (p<0.05). These results indicate that nifedipine regressed LVH with a minimal reduction of blood pressure and without evidence of neurohumoral activation or volume retention. In conclusion, LV function of the heart regressed by nifedipine was preserved after a spontaneous rise in blood pressure and during acute preload elevation." @default.
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• W2022786902 date "1994-01-01" @default.
• W2022786902 modified "2023-09-25" @default.
• W2022786902 title "Left ventricular function of the heart regressed by nifedipine in spontaneously hypertensive rats." @default.
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• W2022786902 doi "https://doi.org/10.1253/jcj.58.116" @default.
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