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Figure 6 Concentration response curves obtained with isoproterenol (10 pmol/liter to 10 µmol/liter) in tracheal strips from rats with CHF (n = 8) and control animals (n = 8). Tracheal strips were precontracted with carbachol (1 µmol/liter). Relaxant responses are plotted as a percentage of the maximal relaxation achieved with isoproterenol (A; NS) and of the maximal relaxation obtained with papaverin (B; p 0.0001 by two-way ANOVA). Curves were fitted using the least-squares method. Data points are mean ± SEM.