In some patients coronary occlusion causes only mild pain, tightness or vague discomfort which may be ignored; however, the myocardium, the muscle tissue of the heart, may be damaged.
According to Robert K. Massie's Nicholas and Alexandra: The Fall of the Romanov Dynasty, Tsar Nicholas II may have suffered a coronary occlusion right before he was toppled from his throne during the Russian Revolution in 1917.
- Massie, Robert K. (2012), Nicholas and Alexandra: The Fall of the Romanov Dynasty. New York, The Modern Library, p. 433. ISBN 0679645616. Accessed 2016-11-19. Originally published in 1967 by Artheneum (United States) as Nicholas and Alexandra: An Intimate Account of the Last of the Romanovs and the Fall of Imperial Russia. ISBN 978-0-679-64561-0.