What are the differential diagnoses for chest pain or pressure in a patient who recently recovered from a viral respiratory illness?

Differential Diagnosis of Post-Viral Chest Pain and Pressure

In patients presenting with chest pain or pressure after recovering from a viral respiratory illness, the primary differential diagnoses include myocarditis, pericarditis, post-acute sequelae of viral infection (PASC-CVS/CVD), coronary microvascular dysfunction, pulmonary embolism, residual pulmonary inflammation, and musculoskeletal pain from coughing. 1

Cardiovascular Causes

Myocarditis and Pericarditis

• Myocarditis presents with chest pain, elevated cardiac troponin (cTn), and abnormal findings on ECG, echocardiogram, or cardiac MRI in the absence of obstructive coronary disease 1
• Symptoms include chest pain/tightness, dyspnea, palpitations, or syncope that persist or emerge after the acute viral phase 1
• Pericarditis manifests as pleuritic chest pain, often sharp and positional, with potential pericardial effusion 2

Post-Acute Cardiovascular Sequelae (PASC-CVD)

The American College of Cardiology identifies specific cardiovascular complications that can cause persistent chest symptoms 1:

• New or worsening myocardial ischemia from coronary microvascular dysfunction 1
• Coronary vasospasm due to endothelial dysfunction—in one study, 82% of PASC patients with angina showed abnormal endothelial-dependent responses to acetylcholine 1
• Nonischemic cardiomyopathy with ventricular wall motion abnormalities 1
• Thromboembolism, particularly pulmonary embolism, especially if accompanied by exercise-induced oxygen desaturation, tachycardia, or presyncope 1

Post-Acute Cardiovascular Syndrome (PASC-CVS)

• This represents a heterogeneous disorder with cardiovascular symptoms without objective evidence of cardiovascular disease on standard testing 1
• Common symptoms include chest pain, tachycardia, exercise intolerance, postexertional malaise, and palpitations 1
• Mechanisms include endothelial dysfunction, inflammation, immune activation, and profound cardiac deconditioning 1
• Chest pain in PASC-CVS may also relate to postural orthostatic tachycardia syndrome (POTS) or myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) 1

Pulmonary Causes

Direct Pulmonary Complications

Post-viral pulmonary issues that cause chest pain include 1:

• Pulmonary embolism—the most serious cause, found in 5-21% of patients presenting with pleuritic chest pain to emergency departments 3
• Residual pneumonia or pneumonitis with ongoing inflammation 1
• Impaired diffusion capacity for carbon monoxide 1
• Pulmonary fibrosis in severe cases 1
• Bronchial hyperreactivity due to pulmonary vascular inflammation 1
• New or worsening asthma triggered by viral infection 1

Pleuritic Pain

• Characterized by sudden, sharp, stabbing, or burning pain that worsens with breathing 3
• Results from parietal pleural irritation or inflammation, as visceral pleura is insensate 4
• Viral pleurisy is common with respiratory viruses including Coxsackieviruses, respiratory syncytial virus, influenza, parainfluenza, adenovirus, and Epstein-Barr virus 3

Musculoskeletal Causes

Cough-Related Chest Wall Pain

• In COVID-19 patients presenting with chest pain, 39% linked symptoms to heavy coughing 5
• Chest pain was present since disease onset in 88% of cases, typically retrosternal (43%), and described as compressing/pressure pain (61%) without radiation (61%) 5
• Musculoskeletal pain from repeated coughing can persist after viral symptoms resolve 5

Diagnostic Approach

Initial Testing Strategy

For patients with cardiovascular symptoms after viral illness, the ACC recommends a structured initial workup 1:

1. Basic laboratory testing: Complete blood count, basic metabolic panel, cardiac troponin (cTn), C-reactive protein 1
2. ECG: Look for diffuse T-wave inversion, ST-segment elevation without reciprocal depression, or QRS prolongation 1
3. Echocardiogram: Assess for ventricular wall motion abnormalities (often noncoronary distribution), abnormal ventricular strain, or pericardial effusion 1
4. Ambulatory rhythm monitor: Detect arrhythmias or tachycardia 1
5. Chest imaging: X-ray and/or CT to evaluate pulmonary parenchyma and rule out pneumonia, fibrosis, or embolism 1
6. Pulmonary function tests: Assess for restrictive or obstructive defects 1

Triad Testing for Athletes or High-Risk Patients

Athletes or patients with ongoing cardiopulmonary symptoms (chest pain/tightness, palpitations, syncope) should undergo "triad testing": ECG, cardiac troponin, and echocardiogram 1

Advanced Imaging

• Cardiac MRI (CMR) is recommended if triad testing is abnormal or cardiopulmonary symptoms persist 1
• CMR with gadolinium contrast effectively distinguishes myopericarditis from other causes including myocardial infarction with nonobstructive coronary arteries (MINOCA) 2
• CMR determines the presence and extent of myocardial and pericardial inflammation and fibrosis 2

When to Refer to Cardiology

Cardiology consultation is recommended for patients with 1:

1. Abnormal cardiac test results
2. Known cardiovascular disease with new or worsening symptoms
3. Documented cardiac complications during the viral infection
4. Persistent cardiopulmonary symptoms not otherwise explained

Critical Pitfalls to Avoid

Don't Miss Pulmonary Embolism

• Pulmonary embolism is the most common serious cause of pleuritic chest pain 3
• Use validated clinical decision rules (Wells criteria, PERC rule) to guide d-dimer testing and CT pulmonary angiography 3
• Viral respiratory infections, particularly COVID-19, increase thrombotic risk 1

Don't Assume Benign Etiology Without Testing

• Even in young patients with mild viral illness, myocarditis can occur and requires 3-6 months of exercise restriction 1
• Patients who develop new cardiopulmonary symptoms after resuming exercise require repeat triad testing 1

Consider Age-Specific Patterns

• Patients with chest pain after viral illness tend to be younger (median age 61 years) compared to those without chest pain (median age 73 years) 5
• However, elderly patients can present atypically with shorter symptom duration and fewer respiratory complaints 5

Recognize Atypical Presentations

• New-onset atrial arrhythmias after viral illness often present with shorter symptom duration, fewer respiratory complaints, and more frequently occur in patients with cardiovascular disease history 5
• Syncope in post-viral patients suggests more serious pathology and warrants comprehensive cardiac evaluation 5

Non-Cardiac Differential Considerations

Gastrointestinal Causes

• In patients with recurrent chest pain without cardiac or pulmonary cause, evaluation for gastrointestinal etiologies (GERD, esophageal spasm, esophagitis) is reasonable 2

Anxiety and Psychosomatic Factors

• For patients with recurrent, similar presentations and negative workup including myocardial ischemia exclusion, referral to cognitive-behavioral therapy is reasonable 2
• However, this should only be considered after thorough exclusion of organic pathology 2