What is the appropriate diagnostic work‑up and initial management for a patient presenting with fatigue, brain fog, and recurrent non‑cardiac chest pain confirmed by emergency department and cardiology evaluation?

Diagnostic Work-Up and Management for Fatigue, Brain Fog, and Recurrent Non-Cardiac Chest Pain

Direct Recommendation

After cardiac causes have been excluded by emergency and cardiology evaluation, pursue a systematic evaluation for gastrointestinal (particularly GERD), musculoskeletal, psychiatric (anxiety/panic disorders), and pulmonary etiologies, with empiric high-dose PPI trial as a first-line diagnostic and therapeutic intervention. 1, 2

Systematic Diagnostic Approach

Initial Considerations After Cardiac Exclusion

Once acute coronary syndrome has been ruled out through appropriate testing (troponin, ECG, stress testing, or angiography), the differential diagnosis shifts to noncardiac causes, which include musculoskeletal (most common), gastrointestinal, respiratory, and psychological etiologies. 1

The 2021 AHA/ACC/CHEST guideline explicitly recommends evaluating for noncardiac causes when patients have persistent or recurring symptoms despite negative cardiac evaluation or low-risk designation. 1

Gastrointestinal Evaluation (First Priority)

• Initiate empiric high-dose proton pump inhibitor (PPI) therapy as both diagnostic test and treatment - this has very good diagnostic accuracy (LR+ 5.48-8.56, LR- 0.24-0.28) with sensitivity 0.89 and specificity 0.88 for GERD. 2

• Typical GERD symptoms (heartburn, regurgitation) increase likelihood of GERD diagnosis (LR+ 2.70-2.75), while atypical symptoms make it less likely (LR+ 0.49). 2

• If PPI trial is negative or symptoms persist despite acid suppression, consider upper endoscopy, particularly if red flag symptoms exist (dysphagia, odynophagia, GI bleeding, unexplained iron deficiency anemia, weight loss, recurrent vomiting). 1

• For persistent symptoms with normal endoscopy, pursue esophageal function testing and pH monitoring. 1

Psychiatric Evaluation (Critical and Often Missed)

Screen for anxiety and panic disorders using validated screening tools - these conditions are frequently undiagnosed in patients with recurrent chest pain and contribute significantly to fatigue and brain fog. 3, 2

• The 2021 GRACE guidelines suggest using depression and anxiety screening tools as they impact healthcare utilization and return ED visits. 3

• Panic and anxiety screening scores can identify individuals requiring further psychiatric evaluation and treatment. 2

• Refer for anxiety or depression management, as this impacts healthcare use and symptom burden. 3

Musculoskeletal Assessment

• Examine for chest wall tenderness, reproducible pain with palpation, recent trauma history, or positional pain characteristics. 1

• Consider costochondritis, muscle strain, or occult rib fracture as common musculoskeletal causes. 1

• Clinical findings for musculoskeletal pain have fair to moderate diagnostic accuracy but should be pursued when history suggests. 2

Pulmonary Evaluation

• While less common, evaluate for pulmonary embolism, pneumonia, or pneumothorax if dyspnea accompanies chest pain. 1

• Consider chest imaging if respiratory symptoms are prominent or physical examination suggests pulmonary pathology. 1

Management of Fatigue and Brain Fog

These symptoms warrant specific attention as they may indicate:

• Psychiatric comorbidity (anxiety, depression, panic disorder) - which commonly coexist with recurrent chest pain and are underdiagnosed. 4, 2

• Sleep disturbance related to anxiety about chest pain recurrence

• Medication side effects from cardiac medications prescribed during initial evaluations

• Deconditioning from activity avoidance due to chest pain fears

Common Pitfalls to Avoid

• Repeated cardiac testing without pursuing noncardiac diagnoses - studies show wide variation in diagnostic approaches reflecting clinician uncertainty, with only 9.2% receiving formal ACS rule-out testing despite recurrent presentations. 4

• Failure to consider psychiatric diagnoses - panic and anxiety disorders are rarely considered despite being common causes of recurrent chest pain with associated fatigue and cognitive symptoms. 4, 2

• Not utilizing PPI diagnostic trial early - this simple intervention has excellent diagnostic accuracy but is underutilized (only 20% in one study). 4, 2

• Premature reassurance without specific diagnosis - 44.7% of patients receive "non-specific chest pain" as discharge diagnosis without further diagnostic plan. 4

Avoiding Unnecessary Testing

• If prior coronary angiography within 5 years showed no occlusive CAD (0% stenosis), recommend expedited outpatient testing rather than admission. 3

• If prior coronary CT angiography within 2 years showed no stenosis, no further cardiac testing is needed beyond single normal high-sensitivity troponin. 3

• If normal stress test within previous 12 months, do not perform routine repeat stress testing. 3