Myocardial blood flow in the left ventricular base and apex of wild-type and Kv1.5^−/− mice (presenting with Takotsubo syndrome) after transaortic constriction surgery. MBF was measured under baseline conditions and during a norepinephrine stress test. Sample sizes: wild-type -control base, n = 6; wild-type -control apex, n = 3; wild-type -NE, n = 6, Kv1.5^−/−-Control, n = 10; Kv1.5^−/−-NE, n = 8. The data sets were analyzed by a one-way ANOVA followed by Šídák’s multiple comparison test. ANOVA, analysis of variance.