Fig. 2From: Ventricular fibrillation immediately after the treatment of Graves’ disease coexisting with atypical angina and long QT syndrome: a case reportAcetylcholine (ACh) provocation test. a Left coronary angiography performed as a control before the Ach provocation test. b Injection of ACh 20 μg into the LCA provokes complete occlusion in the LADBack to article page