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- W2108598689 abstract "Abstract Along with arterial blood pressure reduction, maintenance of the integrity of baroreceptor reflex function contributes to preserving end-organ function in the treatment of hypertensive patients. The purpose of this study was to investigate the effects of antihypertensive agents (trichlormethiazide, atenolol, nicardipine, and enalapril) on baroreceptor reflex function by comparing early and late starts of treatment. We administered each agent to spontaneously hypertensive rats (SHR) as early-start groups from 10 to 36 weeks of age and as late-start groups from 28 to 36 weeks of age. We evaluated the gain of the reflex control of renal sympathetic nerve activity and heart rate using ramp infusions of phenylephrine and nitroglycerin in untreated SHR at 10, 28, or 36 weeks of age and in treated SHR at 36 weeks of age. In 28- and 36-week-old untreated SHR, the renal sympathetic nerve activity gain was not altered and the heart rate gain was decreased (from −2.3±0.3 to −1.3±0.3 and −1.2±0.3 beats per minute [bpm]/mm Hg, P <.05, respectively) compared with 10-week-old SHR. Early and late start of therapy produced arterial pressure reductions (−18±4 and −12±5 mm Hg, P <.05, respectively). In the early-start groups, the renal sympathetic nerve activity gain was improved markedly in nicardipine- and enalapril-treated SHR (−4.2±0.2% and −4.9±0.2% of control/mm Hg, P <.01, respectively), and the heart rate gain was improved markedly in atenolol- and enalapril-treated SHR (−4.1±0.2 and −4.4±0.2 bpm/mm Hg, P <.01, respectively). In the late-start groups, the renal sympathetic nerve activity gain was improved moderately in nicardipine- and enalapril-treated SHR (−3.8±0.2% and −2.9±0.2% of control/mm Hg, P <.05, respectively). The heart rate gain was improved slightly only in nicardipine-treated SHR (−1.9±0.2 bpm/mm Hg, P <.05). These results demonstrate that an early start of antihypertensive treatment improves baroreceptor reflex function markedly compared with a late start of treatment. This supports the hypothesis that a possible critical phase sensitive to intervention with antihypertensive treatment exists during the development of hypertension and indicates that the early start of antihypertensive treatment would be required in clinical practice." @default.
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- W2108598689 date "1996-02-01" @default.
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- W2108598689 title "Comparison of Early and Late Start of Antihypertensive Agents and Baroreceptor Reflexes" @default.
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- W2108598689 doi "https://doi.org/10.1161/01.hyp.27.2.209" @default.
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