What are the recommended emergency department treatment and discharge guidelines for a patient presenting with unspecified exertional chest pain?

Emergency Department Management of Unspecified Exertional Chest Pain

For patients presenting to the ED with exertional chest pain, immediately obtain a 12-lead ECG within 10 minutes, measure high-sensitivity cardiac troponin (hs-cTn) with results available within 60 minutes, and activate EMS for transport rather than allowing self-transport. 1, 2

Initial Assessment and Risk Stratification

Immediate Actions (First 10-60 Minutes)

• ECG within 10 minutes of arrival, interpreted by an experienced physician 1
• hs-cTn measurement at presentation (0 hour) with results within 60 minutes 1
• Vital signs and continuous cardiac monitoring 3
• Focused history capturing:
  • Exertional nature and duration of symptoms
  • Associated symptoms (dyspnea, diaphoresis, nausea, radiation to jaw/arm/back)
  • Cardiovascular risk factors
  • Prior cardiac history 2

Risk Stratification Algorithm

Use validated clinical decision pathways - the evidence strongly supports structured approaches over unstructured clinical judgment 4, 5:

1. ESC 0h/1h Algorithm (preferred if available): Measure hs-cTn at 0 and 1 hour 1
2. ESC 0h/2h Algorithm (alternative): Measure hs-cTn at 0 and 2 hours 1
3. HEART Score: Identifies 20% of patients for early discharge with 99% sensitivity for ACS 6

Disposition Based on Initial Evaluation

Low-Risk Patients (Negative Initial Workup)

If initial ECG is normal and hs-cTn is negative at 0 and 1-2 hours:

• Observe in chest pain unit or ED with cardiac monitoring 3
• Repeat hs-cTn at 3 hours if first measurements inconclusive 1
• Perform stress testing within 72 hours (exercise or pharmacological) before discharge 7, 3
  • Can be done in ED, chest pain unit, or outpatient setting
  • Low-risk patients with negative stress test can be discharged 3

Discharge criteria:

• Normal serial ECGs
• Negative hs-cTn at 0,1-2, and 3 hours
• Negative stress test (if performed)
• No ongoing symptoms 3

Discharge instructions must include: 3

• Specific activity restrictions
• Aspirin 162-325 mg daily (if no contraindications) 8
• Sublingual nitroglycerin instructions
• Follow-up with personal physician within days
• Return precautions for worsening symptoms

Intermediate-Risk Patients

If hs-cTn is between 5-99th percentile (for hs-cTnI) or 6-99th percentile (for hs-cTnT): 4

• Admit to telemetry unit for observation 3
• Repeat hs-cTn at 3-6 hours 4
• Calculate modified HEART score or EDACS 4
• Consider noninvasive testing:
  • Stress testing (exercise or pharmacological) 3
  • CCTA if unable to exercise or abnormal resting ECG 3
  • Coronary CTA reasonable alternative to stress testing 7, 3

Reclassify as low-risk if:

• No or minimal increase in hs-cTn from baseline
• Recent normal testing (<2 years for angiography, <1 year for stress test)
• Low modified HEART score (≤3) or EDACS (<16) 4

High-Risk Patients (Definite ACS)

Admit immediately if ANY of the following: 3

• Ongoing ischemic symptoms
• Positive cardiac biomarkers (hs-cTn >99th percentile with rising pattern)
• New ST-segment deviations
• New deep T-wave inversions
• Hemodynamic abnormalities
• Positive stress test

Admission location:

• Critical care unit: Active ongoing ischemia, hemodynamic instability, or electrical instability 3
• Telemetry step-down unit: Otherwise stable high-risk patients 3

Critical Pitfalls to Avoid

Common Errors

1. Do NOT rely on nitroglycerin response as diagnostic - esophageal spasm responds similarly 2

2. Do NOT use adult stroke scores or single clinical gestalt - structured risk scores (HEART, EDACS) outperform unstructured assessment by 10-19% 6

3. Do NOT discharge with single troponin - serial measurements mandatory even with hs-cTn 1, 9

4. Do NOT use hs-cTn alone at 0 and 2 hours to exclude ACS - must combine with clinical risk scores (TIMI, Vancouver rule) 9

5. Exertional symptoms warrant higher suspicion - even atypical presentations in women, diabetics, and elderly may represent ACS 3, 2

Pre-Hospital Considerations

If patient calls before arrival:

• Instruct to call 9-1-1 immediately - do not self-transport 8, 3
• Chew aspirin 162-325 mg while awaiting EMS (unless allergy or contraindication) 8
• One dose sublingual nitroglycerin if previously prescribed; if no improvement after 5 minutes, call 9-1-1 before additional doses 3

Differential Diagnosis Requiring Urgent Evaluation

Always consider life-threatening alternatives 1, 7:

• Aortic dissection (withhold antithrombotics if suspected)
• Pulmonary embolism
• Tension pneumothorax
• Esophageal rupture

Perform urgent echocardiography if hemodynamic instability of cardiovascular origin 1

Pharmacotherapy During Observation

For low-risk patients awaiting stress test results: 3

• Aspirin 162-325 mg daily
• Sublingual nitroglycerin as needed
• Beta-blockers (consider based on risk factors)

Do NOT routinely administer oxygen unless hypoxic (SpO2 <90%) 8