A patient with a resting heart rate of 115 bpm presenting with dizziness and chest pain—what is the appropriate emergency evaluation and management?

Emergency Evaluation and Management

This patient requires immediate 12-lead ECG within 10 minutes and urgent transfer to the emergency department by EMS—do not delay for additional office-based testing or allow personal automobile transport. 1

Immediate Actions

A resting heart rate of 115 bpm with dizziness and chest pain represents a potentially life-threatening presentation requiring urgent evaluation for acute coronary syndrome (ACS), arrhythmia, pulmonary embolism, or other cardiovascular emergencies.

Critical First Steps (Within 10 Minutes)

• Obtain and interpret 12-lead ECG immediately 1
• If ECG cannot be obtained within 10 minutes in your setting, initiate immediate EMS transfer 1
• Administer aspirin (if no contraindications) 2
• Provide adequate analgesia 2

ECG Interpretation Determines Next Steps

If ST-elevation, new ST depression, or new left bundle branch block:

• Activate STEMI protocol immediately
• Transfer by EMS for urgent coronary reperfusion 1
• Do NOT allow patient to drive themselves—this increases mortality risk 1

If ECG shows other ST-T abnormalities suggesting ischemia:

• Immediate hospital evaluation required
• Transfer by EMS 1

If initial ECG is nondiagnostic but symptoms persist:

• Perform serial ECGs to detect evolving ischemic changes 1
• Consider supplemental leads V7-V9 to rule out posterior MI 1
• Still requires ED evaluation—do not delay transfer for additional office testing 1

Why EMS Transfer is Mandatory

EMS transport provides three critical advantages over personal automobile 1:

1. Prehospital ECG acquisition facilitates immediate reperfusion readiness
2. Trained personnel can treat arrhythmias, provide defibrillation, and manage deterioration en route
3. Shorter travel time to ED with traffic priority

Common Pitfalls to Avoid

• Do not delay transfer to obtain cardiac troponin in the office setting—this is detrimental and increases mortality 1
• Do not perform stress testing or additional diagnostic workup in the office—delayed transfer worsens outcomes 1
• Do not allow personal automobile transport for suspected ACS—this is associated with increased risk 1
• Do not assume normal initial ECG excludes ACS—a substantial proportion of ACS patients have initially normal ECGs 1

Differential Considerations with Tachycardia

The combination of tachycardia (HR 115), dizziness, and chest pain raises concern for:

• Acute coronary syndrome (demand ischemia from tachycardia or primary ACS causing compensatory tachycardia)
• Pulmonary embolism (classic triad of tachycardia, chest pain, dyspnea)
• Primary arrhythmia (supraventricular tachycardia, atrial fibrillation with rapid ventricular response)
• Myocarditis or pericarditis
• Aortic dissection

All of these require emergency department evaluation with cardiac biomarkers, imaging, and continuous monitoring that cannot be safely performed in the outpatient setting 1, 3.

What Happens in the ED

Once transferred, the patient will receive 1, 3:

• Serial cardiac troponins (high-sensitivity troponin is most sensitive for myocardial injury)
• Continuous cardiac monitoring
• Risk stratification using validated tools
• Additional imaging as indicated (echocardiography, CT angiography, stress testing)

The office setting is not equipped for safe evaluation of this presentation—immediate EMS transfer is the standard of care.