Treatment of Unstable Angina

Initial Management

The American College of Cardiology recommends that patients with unstable angina should be hospitalized immediately, preferably in a coronary care unit, for close monitoring and aggressive treatment 1
The American Heart Association suggests providing short-acting nitroglycerin for immediate symptom relief with proper usage instructions 1
Administering aspirin 75-150 mg daily significantly reduces the risk of myocardial infarction, stroke, or death, as recommended by the American College of Cardiology 1, 2
Starting beta-blockers intravenously in hemodynamically stable patients, followed by oral maintenance therapy, is recommended by the American College of Cardiology 1
The American College of Cardiology recommends beginning anticoagulation with either unfractionated heparin (UFH) or low molecular weight heparin (LMWH) 1, 2
Enoxaparin is preferable to UFH as an anticoagulant in patients with unstable angina/NSTEMI, unless coronary artery bypass grafting (CABG) is planned within 24 hours, as suggested by the American Heart Association 2

High-risk patients are identified by recurrent ischemia, elevated cardiac biomarkers, hemodynamic instability, major arrhythmias, or early post-infarction unstable angina, according to the European Society of Cardiology 1
If non-cardiac surgery can be postponed safely, patients should be diagnosed and treated according to unstable angina management guidelines, as recommended by the European Society of Cardiology 3
In the unlikely combination of a life-threatening clinical condition requiring urgent non-cardiac surgery and acute coronary syndrome, surgery should be given priority, according to the European Society of Cardiology 3
An early invasive strategy with routine coronary angiography within 48 hours followed by revascularization is recommended for intermediate to high-risk patients, as suggested by the American College of Cardiology 2
The TACTICS-TIMI 18 trial demonstrated that an early invasive strategy reduced death, myocardial infarction, or rehospitalization for acute coronary syndrome at 6 months (15.9% vs 19.4%) compared to a conservative strategy, according to the American Heart Association 2

Beta-blockers: Administering intravenously in hemodynamically stable patients, followed by oral maintenance therapy, is recommended by the American College of Cardiology 1
Nitrates: Using intravenous nitroglycerin for acute management, followed by long-acting nitrates for maintenance therapy, is suggested by the American College of Cardiology 1
Dual antiplatelet therapy: Continuing aspirin 75-150 mg daily long-term and clopidogrel 75 mg daily for at least 12 months is recommended by the American College of Cardiology 1, 2
Anticoagulation: Using either unfractionated heparin or low molecular weight heparin during the acute phase is recommended by the American College of Cardiology 2
Statins: Initiating high-intensity statin therapy for all patients with unstable angina is recommended by the American College of Cardiology 1

If percutaneous coronary intervention (PCI) is indicated, the use of bare metal stents or balloon angioplasty is recommended when non-cardiac surgery is planned soon after intervention, according to the European Society of Cardiology 3
For patients with significant left main disease, three-vessel disease (particularly with depressed left ventricular function), coronary artery bypass grafting (CABG) should be performed to improve prognosis and relieve symptoms, as recommended by the European Society of Cardiology 3
The choice between PCI and CABG will depend on several factors including coronary anatomy, comorbidities, and patient preference, according to the European Society of Cardiology 3

Continuing aspirin 75-150 mg daily indefinitely is recommended by the American College of Cardiology 1
Maintaining beta-blocker therapy, particularly in post-MI patients, is recommended by the American College of Cardiology 1
Continuing statin therapy for all patients with coronary disease is recommended by the American College of Cardiology 1
Considering ACE inhibitors for patients with left ventricular dysfunction, hypertension, or diabetes is recommended by the European Society of Cardiology 4

The American Heart Association recommends administering clopidogrel 75 mg daily, in addition to aspirin, unless urgent CABG is planned within 24 hours, as evidenced by studies published in Circulation 5
The American College of Cardiology recommends initiating high-intensity statin therapy before hospital discharge, as early initiation improves outcomes and increases long-term adherence, according to the Journal of the American College of Cardiology 6

Diabetic patients with single-vessel disease and inducible ischemia may benefit from PCI, as suggested by research published in Circulation 5, 7
The American Heart Association strongly prefers CABG for significant left main disease, three-vessel disease, or diabetic patients with multivessel disease, as stated in Circulation 7

The American Heart Association recommends aspirin 75-150 mg daily indefinitely, as well as beta-blockers continued long-term, particularly in post-MI patients, according to Circulation 5, 7
The American College of Cardiology recommends statins for all patients with coronary disease, targeting LDL <100 mg/dL, as published in the Journal of the American College of Cardiology 6 and Circulation 7

The American Heart Association recommends smoking cessation with referral to cessation programs, as well as tight glucose control in diabetic patients, according to Circulation 5, 7
The American Heart Association also recommends weight optimization and daily exercise, as published in Circulation 5, 7

High-risk patients should return in 1-2 weeks, while low-risk medically treated or revascularized patients should return in 2-6 weeks, as suggested by research published in Circulation 5, 7