Abstract
Endothelin-1 and nitric oxide play an important regulatory role in the control of vascular smooth muscle tone. Nitroglycerin (NTG), a nitric oxide donating drug, may inhibit endothelin production. In this double-blind placebo-controlled crossover study, plasma levels of endothelin-1 were measured before and immediately (5–30 s) after 80 min infusion of NTG (glyceryl trinitrate) or saline in 12 healthy subjects. On two different days separated by at least 1 week, NTG in four different doses, 0.015, 0.25, 1.0, and 2.0 μg·kg−1·min−1, or placebo (isotonic saline) was infused successively for 20 min each dose. During the infusion blood pressure and heart rate were measured. NTG infusion significantly decreased systolic blood pressure from 112.4 to 103.4 mmHg and pulse pressure from 39.3 to 29.5 mmHg. Heart rate increased from 62.7 to 73.1 beats·min−1. No changes in endothelin-1 plasma levels were induced by NTG infusion (2.4 pg·ml−1 before NTG vs. 2.7 pg·ml−1 after NTG) and placebo infusion also did not affect plasma endothelin-1. It is concluded that venous plasma levels of endothelin-1 are not altered immediately after NTG infusion.
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Thomsen, L.L., Iversen, H.K., Emmeluth, C. et al. Venous plasma levels of endothelin-1 are not altered immediately after nitroglycerin infusion in healthy subjects. Eur J Clin Pharmacol 48, 139–142 (1995). https://doi.org/10.1007/BF00192739
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DOI: https://doi.org/10.1007/BF00192739