Chest pain is one of the most common CCS presentations on USMLE Step 3 and one of the highest-yield topics to master. The case can be set in the ER, clinic, or floor — and the setting dramatically changes your approach. This article gives you a complete framework for managing any chest pain CCS case, including the orders you need, the branch points to watch for, and the diagnoses that will cost you the case if you miss them.
The First 60 Seconds: Every Chest Pain Case
Regardless of setting, here is your opening sequence for any patient presenting with chest pain:
Immediate orders (place before physical exam if vitals are abnormal):
1. IV access
2. Cardiac monitor + pulse oximetry
3. EKG (12-lead) — this is the single most important order
4. Oxygen (if SpO2 < 94% or patient in distress)
Then perform: Focused physical exam (cardiac, pulmonary, abdominal)
Stat labs:
• Troponin I (or troponin T)
• CBC
• BMP
• Coagulation studies (PT/INR, PTT) if considering PE or thrombolytics
• D-dimer (if PE is on your differential and the patient is not high-risk)
Initial imaging:
• Chest X-ray (portable if in ER)
Advance the clock 15–30 minutes to get EKG and initial lab results.
Branch Point: What the EKG Shows
The EKG result determines your next move. Here are the major branches:
Branch 1: ST Elevation → STEMI
Immediate management:
• Aspirin 325 mg (chewed)
• Nitroglycerin sublingual (if no hypotension, no right-sided MI, no PDE-5 inhibitor use)
• Heparin (unfractionated or enoxaparin)
• Clopidogrel (or ticagrelor)
• Morphine (if pain persists despite nitroglycerin)
• Cardiology consult — STAT
• Transfer to ICU/CCU
• Cardiac catheterization (PCI is definitive treatment)
Do not delay calling cardiology to wait for troponin results. STEMI is diagnosed by EKG.
Follow-up orders after PCI:
• Beta-blocker (metoprolol)
• ACE inhibitor (lisinopril)
• High-intensity statin (atorvastatin 80 mg)
• Echocardiogram
• Monitor: serial troponins, repeat EKG, telemetry
Branch 2: ST Depression / T-Wave Inversion + Elevated Troponin → NSTEMI
Management:
• Aspirin 325 mg
• Heparin
• Clopidogrel
• Beta-blocker
• Nitroglycerin
• Cardiology consult
• Transfer to ICU/CCU or telemetry floor
• Echocardiogram
• Cardiac catheterization (may be urgent or scheduled)
Branch 3: Normal EKG + Normal Troponin → Unstable Angina or Non-Cardiac
If clinical suspicion is high for ACS:
• Serial troponins (repeat at 3 and 6 hours)
• Observe on telemetry
• Stress test before discharge
If clinical suspicion is low:
• Consider other diagnoses on differential
• May discharge with outpatient follow-up after negative serial troponins
Branch 4: Suspecting Pulmonary Embolism
If the patient has pleuritic chest pain, dyspnea, tachycardia, recent immobilization, or leg swelling:
• D-dimer (if low/moderate pretest probability)
• CT pulmonary angiography (if high pretest probability or positive D-dimer)
• Heparin (start empirically if high suspicion while awaiting imaging)
• If massive PE with hemodynamic instability: thrombolytics + ICU transfer
Branch 5: Suspecting Aortic Dissection
If the patient has tearing chest pain radiating to the back, blood pressure discrepancy between arms, or widened mediastinum on CXR:
• CT angiography of the chest (with aortic protocol)
• Blood pressure control: IV esmolol or labetalol (target HR < 60, SBP < 120)
• Cardiothoracic surgery consult — STAT
• Transfer to ICU
• Do NOT give thrombolytics or anticoagulation until dissection is ruled out
Branch 6: Suspecting Pneumothorax
If the patient has sudden-onset pleuritic chest pain with decreased breath sounds:
• Chest X-ray (will show if pneumothorax is present)
• If tension pneumothorax (hypotension, tracheal deviation): needle decompression followed by chest tube — STAT
• If simple pneumothorax: chest tube or observation depending on size
Don't-Miss Diagnoses
These are the chest pain diagnoses that, if missed on a CCS case, will result in the patient deteriorating and you losing maximum points:
1. STEMI — Miss this and the patient dies. Always get an EKG first.
2. Pulmonary embolism — Think PE in any patient with pleuritic chest pain + dyspnea + risk factors
3. Aortic dissection — Tearing pain to the back, BP discrepancy, widened mediastinum
4. Tension pneumothorax — Absent breath sounds + hypotension = needle decompression NOW
5. Cardiac tamponade — Beck's triad (hypotension, muffled heart sounds, JVD) → pericardiocentesis
6. Esophageal rupture (Boerhaave) — Chest pain after forceful vomiting, subcutaneous emphysema
Chest Pain by Setting
ER Chest Pain
Most chest pain CCS cases are set in the ER. Use the full algorithm above. Assume the worst until you prove otherwise. Always get an EKG and troponin.
Clinic Chest Pain
Outpatient chest pain is often less acute. The differential expands to include:
• GERD (burning, worse with meals, improves with antacids)
• Musculoskeletal (reproducible with palpation)
• Costochondritis
• Anxiety/panic disorder
• Stable angina
For stable clinic presentations: complete physical exam, EKG, basic labs, and refer for stress testing if concerning. If the patient develops acute symptoms during the visit, transfer to ER.
Floor (Inpatient) Chest Pain
A hospitalized patient developing new chest pain raises concern for:
• Post-procedural MI
• Pulmonary embolism (especially post-surgical)
• Hospital-acquired pneumonia
• Pericarditis
• Stress ulcer / GI cause
Order EKG, troponin, CXR, and D-dimer. Manage based on findings.
The Complete Order Set: Chest Pain (ER)
Immediate:
• IV access
• Cardiac monitor
• Pulse oximetry
• O2 via nasal cannula (if SpO2 < 94%)
• EKG (12-lead)
• Aspirin 325 mg PO (if ACS suspected)
Labs:
• Troponin I (serial: 0, 3, 6 hours)
• CBC
• BMP
• Coagulation panel (PT/INR, PTT)
• D-dimer (if PE on differential)
• BNP (if heart failure suspected)
• Lipid panel
Imaging:
• Chest X-ray (portable)
• Echocardiogram (if ACS, heart failure, or tamponade suspected)
• CT pulmonary angiography (if PE suspected)
• CT aortogram (if dissection suspected)
Treatment (ACS pathway):
• Nitroglycerin sublingual
• Heparin drip
• Clopidogrel 300 mg loading
• Beta-blocker (metoprolol)
• Morphine (for refractory pain)
• High-intensity statin
Consults:
• Cardiology
• Cardiothoracic surgery (if dissection)
Disposition:
• ICU/CCU for STEMI, unstable patients
• Telemetry floor for NSTEMI, stable ACS
• Discharge with follow-up for low-risk, negative workup
Follow-up / Preventive:
• Follow-up appointment (1–2 weeks)
• Smoking cessation counseling
• Diet counseling (low sodium, heart-healthy)
• Cardiac rehabilitation referral
• Medication adherence counseling
• Exercise counseling
This is the chest pain spoke of our CCS approach series. For the complete framework, see: Ultimate Guide to CCS Section of Step 3 (2026)
Related Chief Complaint Articles:
• CCS Shortness of Breath: Complete Approach & Order Sets
• CCS Abdominal Pain: Step-by-Step Workup & Management
• CCS Altered Mental Status: First 60 Seconds to Disposition