Figure 5. Acute hypoxic response (AHR) versus hypoxic ventilatory decrease (HVD). (Left) Effects of isoflurane. The data points and the linear regressions are plotted for control (solid line), 0.1 MAC (dotted line), and 0.2 MAC isoflurane (dashed line). The outlier in the control data (AHR = 15.2, HVD = 3.9 l *symbol* min sup -1) was omitted from the linear regression analysis. Linear regression on the pooled data yielded a slope of 0.6 and an intercept with the ordinate of 0.6 l *symbol* min sup -1 (r = 0.9; P < 0.001) (not shown). Data from this study. (Middle) Effects of enflurane. Linear regression is shown through the data points for control (solid line) (n = 12; r = 0.9; P < 0.001) and 0.07 MAC enflurane (dotted line) (n = 12; r = 0.8; P < 0.001). Regression of the pooled data yielded a slope of 0.5 and intercept with the ordinate of 1.2 l *symbol* min sup -1. Data from Nagyova et al. [33](Right) Effects of halothane. Linear regression is shown through the data points for control (solid line) (n = 10; slope = 0.4; intercept with the ordinate = 0.3 l *symbol* min sup -1; r = 0.8; P < 0.01) and 0.15 MAC halothane (dotted line) (n = 10; slope = 0.6; intercept with the ordinate = 1.7 l *symbol* min sup -1; r = 0.7, P < 0.05). Data from Dahan et al. [4].