title: Unstable angina.
mesh_terms: D000787:Angina Pectoris / Q000503:physiopathology*; D000788:Angina Pectoris, Variant / Q000209:etiology / Q000503:physiopathology*; D003251:Constriction, Pathologic; D003331:Coronary Vessels / Q000503:physiopathology; D006439:Hemodynamics; D006801:Humans; D010146:Pain / Q000188:drug therapy; D014661:Vasoconstriction