to examine its sensitivity and specificity , incremental doses of acetylcholine ( 20 , 50 and 100 micrograms into the left coronary artery and 20 and 50 micrograms into the right coronary artery ) were injected into the coronary artery or arteries in 70 patients with variant angina ( group 1 ) ( mean age 57 years ) and 93 patients without variant angina or angina at rest ( group 2 ) ( mean age 54 years ) .
C0002963
variant angina
C0002965
angina