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Nitrite (NO2) and nitrate (NO3) plasma concentrations during the first hour (0, 10, 30 and 60 min) of general anaesthesia with either propofol (P, n = 18) or thiopental/sevoflurane (S, n = 14). Data are shown as mean values ± SEM. Two-tailed Mann–Whitney U-test was used to test statistical significance. None of the comparisons yielded statistical significance between the groups (P > 0.05)
