1. 1. Yasue H, Horio Y, Nakamura N, et al. Induction of coronary artery spasm by acetylcholine in patients with variant angina: possible role of the parasympathetic nervous system in the pathogenesis of coronary artery spasm. Circulation 74: 955-963, 1986.
2. 2. Okumura K, Yasue H, Matsuyama K, et al. Sensitivity and specificity of intracoronary injection of acetylcholine for the induction of coronary artery spasm. J Am Coll Cardiol 12: 883-888, 1988.
3. 3. Okumura K, Yasue H, Horio Y, et al. Multivessel coronary spasm in patients with variant angina: a study with intracoronary injection of acetylcholine. Circulation 77: 535-542, 1988.
4. 4. Sato K, Kaikita K, Nakayama N, et al. Coronary vasomotor response to intracoronary acetylcholine injection, clinical features, and long-term prognosis in 873 consecutive patients with coronary spasm: analysis of a single-center study over 20 years. J Am Heart Assoc 2: e000227, 2013.
5. 5. Ong P, Athabasiadis A, Borgulya G, Mahrholdt H, Kaski JC, Secctem U. High prevalence of a pathological reponse to acetylcholine testing in patients with stable angina pectoris and unobstructed coronary arteries: the ACOVA study. J Am Coll Cardiol 59: 655-662, 2012.