Figure 4. Comparison of the effects of desflurane, isoflurane, and halothane at a [Ca sup ++]oof 1 mM without (A) or with (B) adrenoceptor blockade with propanolol and phentolamine on isometric active force normalized per cross-sectional area (AF). Data are mean +/- SD (n = 10 in each group). * P < 0.05 versus control values. Probabilitly values refer to between-group comparisons. NS = not significant.