Variable threshold of exertional angina: a clue to a vasospastic component.
D000787:Angina Pectoris / Q000503:physiopathology*; D017023:Coronary Angiography; D003331:Coronary Vessels / Q000503:physiopathology; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D005082:Physical Exertion