Coronary arteriography and left ventriculography during spontaneous and exercise-induced ST segment elevation in patients with variant angina

2011 ACCF/AHA Focused Update Incorporated Into the ACC/AHA 2007 Guidelines for the Management of Patients With Unstable Angina/Non–ST-Elevation Myocardial Infarction

“…Episodes of Prinzmetals angina often occur in clusters, with prolonged asymptomatic periods of weeks to months. Attacks can be precipitated by an emotional stress, hyperventilation, 895 exercise, 896 or exposure to cold. 897 A circadian variation in the episodes of angina is most often present, with most attacks occurring in the early morning.…”

ACC/AHA 2007 Guidelines for the Management of Patients With Unstable Angina/Non–ST-Elevation Myocardial Infarction

“…Episodes of Prinzmetal's angina often occur in clusters, with prolonged asymptomatic periods of weeks to months. Attacks can be precipitated by an emotional stress, hyperventilation (895), exercise (896), or exposure to cold (897). A circadian variation in the episodes of angina is most often present, with most attacks occurring in the early morning (898).…”

2012 ACCF/AHA Focused Update Incorporated Into the ACCF/AHA 2007 Guidelines for the Management of Patients With Unstable Angina/Non–ST-Elevation Myocardial Infarction

“…Episodes of Prinzmetal's angina often occur in clusters, with prolonged asymptomatic periods of weeks to months. Attacks can be precipitated by an emotional stress, hyperventilation, 1039 exercise, 1040 or exposure to cold. 1041 A circadian variation in the episodes of angina is most often present, with most attacks occurring in the early morning.…”