title: Treatment of angina pectoris: associations with symptom severity.
abstract: OBJECTIVE
  To evaluate whether the frequency of anginal attacks in medically treated patients with stable angina is related to the intensity of anti-anginal treatment, the clinical history and coronary anatomy.
  
  
  METHODS
  Analysis of baseline data from the A Coronary disease Trial Investigating Outcome with Nifedipine GITS (ACTION) study, an ongoing placebo-controlled trial in 7669 patients with stable angina pectoris who require anti-anginal treatment.
  
  
  RESULTS
  Prior to randomisation, 8% of 7669 patients had no anginal attacks, 63% had occasional, 22% had regular, 4% had frequent and 3% had daily attacks. Men (79% of all patients) and patients with a history of MI (51%) had less frequent anginal attacks (P<0.0001). The number of coronary angiograms ever performed (70% had at least one angiogram), the extent of angiographic coronary disease (32% of those who had angiography had more than two-vessel disease), a history of peripheral artery disease (12%), the number of anti-anginal drugs used (64% were prescribed two or more such medications) and a history of revascularisation (a history of coronary bypass surgery was present in 23% and of balloon dilatation in 26%) were each positively associated with anginal attack frequency.
  
  
  CONCLUSIONS
  For the majority of patients with chronic stable angina not on a calcium-antagonist, medical treatment with other anti-anginal drugs is sufficient to control symptoms and only a minority of patients are refractory to medical treatment. Invasive treatments for chronic stable angina are only needed in a small proportion where symptoms persist.
authors.affiliation: SOCAR Research SA, Nyon, Switzerland.
authors.forename: B-A
authors.initials: BA
authors.lastname: Kirwan
authors.forename: J
authors.initials: J
authors.lastname: Lubsen
authors.forename: P A
authors.initials: PA
authors.lastname: Poole-Wilson
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000787:Angina Pectoris / Q000188:drug therapy*; D015906:Angioplasty, Balloon, Coronary; D002318:Cardiovascular Diseases / Q000453:epidemiology; D017023:Coronary Angiography; D003925:Diabetic Angiopathies / Q000628:therapy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D012307:Risk Factors; D016896:Treatment Outcome