title: ST-Segment alternans in Prinzmetal's angina. A report of two cases.
mesh_terms: D000368:Aged; D017023:Coronary Angiography; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008564:Membrane Potentials; D008875:Middle Aged; D010146:Pain / Q000503:physiopathology*; D013577:Syndrome; D013896:Thoracic Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology*