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- W2108356735 abstract "1. The effects of 1,4-dihydropyridine calcium antagonists with different biological half-lives, amlodipine and nifedipine retard on 24 h blood pressure (BP), heart rate (HR) and autonomic nerve activity in patients with essential hypertension were compared. 2. Twenty patients (six men and 14 women; mean (+/- SEM) age 63 +/- 2 years) with essential hypertension were enrolled in the present study. Their ambulatory BP and electrocardiograms were monitored for 24 h at intervals of 30 min with a portable recorder after a 4 week drug-free period, after a 4 week treatment period with amlodipine (2.5 or 5 mg once daily) and after a 4 week treatment period with nifedipine retard (10 or 20 mg twice daily). The order of the three periods was randomized. Autonomic nerve activity was evaluated by power spectral analysis of HR variability, using the high frequency (HF) component as an index of parasympathetic activity and the ratio of the low frequency (LF) to the HF component as an index of sympathovagal balance. 3. Amlodipine and nifedipine retard significantly lowered the 24 h BP to a similar extent (amlodipine: -12.7 +/- 2.6/-5.6 +/- 1.4 mmHg, P < 0.01/P < 0.01; nifedipine retard: -15.1 +/- 2.1/-6.9 +/- 1.5 mmHg, P < 0.01/P < 0.01). Amlodipine did not change the 24 h average HR, while nifedipine retard significantly increased it (+3.3 +/- 1.2 b.p.m., P < 0.05). Amlodipine also did not change the HF component or the ratio of the LF to the HF component. However, nifedipine retard significantly decreased the HF component (P < 0.01) and increased the ratio of the LF to the HF component (P < 0.05). 4. These results suggest that nifedipine retard caused a decrease in parasympathetic activity and an increase in sympathetic activity with reflex tachycardia in these patients with essential hypertension, while amlodipine did not produce such effects on the autonomic nervous system." @default.
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- W2108356735 date "1998-08-01" @default.
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- W2108356735 title "EFFECTS OF AMLODIPINE AND NIFEDIPINE RETARD ON AUTONOMIC NERVE ACTIVITY IN HYPERTENSIVE PATIENTS" @default.
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- W2108356735 doi "https://doi.org/10.1111/j.1440-1681.1998.tb02254.x" @default.
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