Acute Coronary Syndrome Diagnosis and Management

Life-Threatening Causes to Consider Immediately

The American College of Cardiology and the European Heart Society recommend that acute coronary syndrome (ACS) remains the primary concern when crushing chest pain occurs with all peripheral pulses intact, as an uncomplicated myocardial infarction may present with a completely normal physical examination, with associated features such as diaphoresis, nausea, vomiting, radiation to arm/jaw/neck, and symptoms interrupting normal activity increasing ACS likelihood 1, 2, 3, 4.
The American Heart Association notes that crushing chest pain with intact pulses is entirely consistent with ST-elevation myocardial infarction (STEMI) or non-ST-elevation ACS (NSTE-ACS), and that the physical examination contributes almost nothing to diagnosing a heart attack unless shock is present 1, 2, 4.
The European Society of Cardiology states that aortic dissection, although less likely, is still a critical consideration, with the presence of all peripheral pulses not excluding this diagnosis, and that type B dissections have pulse differentials less frequently than Type A 1, 2, 3.
The American College of Chest Physicians recommends considering pulmonary embolism, which typically presents with tachycardia and dyspnea in >90% of patients, with pleuritic chest pain, and peripheral pulses remaining intact in PE 1, 2, 3.

The American College of Cardiology recommends activating 9-1-1 immediately and transporting the patient by EMS to the nearest emergency department, obtaining and interpreting an ECG within 10 minutes of arrival to identify STEMI, new left bundle branch block, ST-segment changes, or T-wave inversions, and placing the patient on a cardiac monitor with resuscitation equipment immediately available 1, 2, 5, 6.
The European Heart Society suggests administering aspirin 250-500mg (chewable or water-soluble) unless contraindicated, and establishing IV access and drawing cardiac troponin (T or I), complete blood count, and basic chemistry 4, 5, 6.

The American Heart Association recommends considering high-risk features requiring immediate intervention, including ST-segment elevation or new left bundle branch block on ECG, recurrent ischemia, elevated troponin levels, hemodynamic instability, and major arrhythmias 5.

The American College of Cardiology advises against relying on pain severity to determine urgency, as severity is a poor predictor of imminent complications like cardiac arrest, and against delaying treatment waiting for definitive diagnosis in patients with red flags 5, 6.
The European Society of Cardiology notes that the absence of pulse differential does NOT rule out aortic dissection, and that elderly patients and those with diabetes may present with atypical symptoms despite severe disease 1, 2, 5, 6.