16.10: Pericarditis II: Clinical Features and Diagnostic Tests

Pericarditis is distinguished by inflammation of the pericardium, the fibrous sac that encases the heart. It can be acute, lasting less than six weeks, or chronic, persisting for over three months. Understanding its clinical manifestations and diagnostic findings is crucial for timely and effective management.

Clinical Manifestations

While pericarditis can be asymptomatic, it usually presents with characteristic symptoms such as:

• Chest Pain: The most characteristic symptom of pericarditis is chest pain, which can also occur in the neck, beneath the clavicle, or in the left trapezius region. This pain typically remains constant but may worsen with deep breathing, lying down, or turning.
• Pericardial Friction Rub: The hallmark clinical manifestation is a creaky or scratchy friction rub heard most clearly at the left lower sternal border. It is often best heard with the patient leaning forward and holding their breath after expiration. This sound is caused by the inflamed pericardial layers rubbing against each other.
• Systemic Symptoms: Patients may exhibit mild fever, elevated white blood cell (WBC) count, anemia, and increased erythrocyte sedimentation rate (ESR) or C-reactive protein (CRP) levels, all indicative of inflammation.
• Respiratory Symptoms: Patients may experience a nonproductive cough or hiccups. Dyspnea and respiratory splinting due to pain upon inspiration are also common. In severe cases, signs and symptoms of heart failure may occur due to pericardial compression from constrictive pericarditis or cardiac tamponade.
• Heart Rate Changes: The heart rate may increase to maintain cardiac output, compensating for the reduced efficiency caused by pericardial compression.

Assessment and Diagnostic Findings

Pericarditis is typically diagnosed through a comprehensive assessment of the patient's medical history, clinical manifestations, and symptoms. Various diagnostic methodologies are employed to evaluate the severity of the condition.

• Echocardiogram: This imaging technique is crucial for detecting pericardial effusion, inflammation, and tamponade and assessing heart function.
• Electrocardiogram (ECG): The ECG shows diffuse ST segment elevations across multiple leads, a hallmark of acute pericarditis. PR-segment depression is also a characteristic finding.
• Imaging Studies:
  1. CT and MRI: Provide detailed visualization of the pericardium, which helps assess thickening, inflammation, or constriction.
  2. Chest X-ray: May show cardiomegaly if there is a large pericardial effusion.
• Laboratory Tests:
  1. Leukocytosis: Elevated white blood cell count indicating inflammation or infection.
  2. C-Reactive Protein (CRP): Elevated levels suggest inflammation.
  3. Erythrocyte Sedimentation Rate (ESR): Increased ESR is a non-specific marker of inflammation.
  4. Troponin Levels: Elevated levels may indicate concurrent myocardial damage, which can occur in myopericarditis.
• Invasive Procedures:
  1. Pericardiocentesis: Aspiration of pericardial fluid to analyze for infection, malignancy, or other causes.
  2. Pericardial Biopsy: Obtaining a tissue sample to determine the underlying cause, especially if malignancy or tuberculosis is suspected.

Conclusion

Pericarditis requires prompt recognition and accurate diagnosis to prevent complications. By understanding its clinical manifestations and utilizing appropriate diagnostic tools, healthcare providers can ensure effective management and improved patient outcomes. Early intervention can alleviate symptoms, reduce inflammation, and address underlying causes, improving the overall prognosis for individuals with pericarditis.