Initial Management of Unstable Angina

Immediate Stabilization

• The American College of Cardiology recommends placing the patient on continuous cardiac monitoring with bed/chair rest, administering aspirin 162-325 mg, initiating anticoagulation, and beginning risk stratification to determine the timing of invasive strategy 1, 2, 3.
• Place patient on continuous ECG monitoring and enforce bed/chair rest to detect arrhythmias and reduce myocardial oxygen demand 1, 2, 3.
• Obtain 12-lead ECG immediately to rule out ST-elevation MI requiring a different management pathway 5.
• Administer supplemental oxygen only if arterial oxygen saturation is <90%, respiratory distress, or high-risk features for hypoxemia 1, 2, 3.
• Administer aspirin 162-325 mg immediately unless documented allergy 1, 2, 3, 5.
• Initiate parenteral anticoagulation immediately in all patients with unfractionated heparin or enoxaparin 7, 4, 6.

Symptom Management

• For ongoing ischemic chest discomfort, give sublingual nitroglycerin 0.4 mg every 5 minutes for a maximum of 3 doses 1, 2, 3.
• Intravenous nitroglycerin is indicated in the first 48 hours for persistent ischemia, heart failure, or hypertension 1, 2, 3.
• If chest discomfort persists despite nitroglycerin, administer morphine sulfate intravenously 7, 1, 2, 3, 4.

Pharmacologic Therapy

• Initiate oral beta-blocker therapy within the first 24 hours unless patient has signs of heart failure, evidence of low-output state, increased risk for cardiogenic shock, or contraindications 1, 2, 3, 4, 6.
• Administer ACE inhibitor orally within the first 24 hours to patients with pulmonary congestion or left ventricular ejection fraction ≤0.40 1, 2, 3, 4, 6.
• Use angiotensin receptor blocker for ACE inhibitor-intolerant patients with heart failure or LVEF ≤0.40 1, 2, 3, 4, 6.

Risk Stratification and Management Strategy Selection

• Perform immediate risk stratification using GRACE or TIMI score to determine the timing of invasive strategy 4, 6.
• Early invasive strategy (angiography within 12-24 hours) is mandatory for high-risk patients (GRACE score >140) 9, 4, 6.
• Conservative strategy (selective invasive) may be considered only for low-to-intermediate risk patients who are initially stabilized 9, 4, 6.

Critical Pitfalls to Avoid

• Discontinue all NSAIDs (except aspirin) immediately due to increased risks of mortality, reinfarction, hypertension, heart failure, and myocardial rupture 1, 2, 3, 4, 6.
• Avoid omeprazole and esomeprazole with clopidogrel due to reduced antiplatelet effect 4.
• Do not delay angiography in high-risk patients for "medical stabilization" as early invasive approach (within 24 hours) reduces ischemic events 9, 4.