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Abstract
1. The pharmacokinetics and haemodynamic effects of nisoldipine on long term i.v. infusion of 2.40 mg and 9.59 mg in 25 h were studied in six healthy subjects. Liver blood flow at 0.8 and 24 h was assessed by measuring indocyanine green (ICG) clearance. 2. After high-dose nisoldipine, systemic clearance was 0.99 +/- 0.16 1 min-1, volume of distribution was 5.8 +/- 1.5 1 kg-1 and elimination half-life was 10.7 +/- 2.4 h. The pharmacokinetic parameters were similar after low-dose nisoldipine. 3. No significant changes in apparent liver blood flow were observed after either high-dose or low-dose nisoldipine. 4. Systolic blood pressure did not change, whereas diastolic blood pressure decreased by approximately 10% during both treatments. Maximal increase in heart rate was approximately 37% at high-dose infusion, whereas this was one half lower during the low-dose regimen. 5. Increased infusion rate results in an unfavourable shift in the haemodynamic effect profile of nisoldipine.
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