Myopericarditis versus viral or idiopathic acute pericarditis

Area of Science:

• Cardiology
• Internal Medicine
• Infectious Diseases

Background:

• Acute pericarditis is an inflammation of the pericardium, the sac surrounding the heart.
• Myopericarditis involves inflammation of both the pericardium and the heart muscle (myocardium).
• The relative incidence, clinical presentation, and prognosis of myopericarditis in idiopathic or viral acute pericarditis require further investigation.

Purpose of the Study:

• To determine the prevalence of myopericarditis in patients diagnosed with idiopathic or viral acute pericarditis.
• To describe the clinical features and presenting symptoms associated with myopericarditis.
• To evaluate the 12-month prognosis and potential complications of myopericarditis.

Main Methods:

• A prospective observational clinical cohort study was conducted.
• The study included 274 consecutive patients with idiopathic or viral acute pericarditis from two urban general hospitals.
• Data collected included clinical presentation, echocardiographic parameters (ejection fraction, wall motion score index), and follow-up assessments at 12 months.

Main Results:

• Myopericarditis was diagnosed in 14.6% (40/274) of patients.
• Independent predictors for myopericarditis included arrhythmias, male gender, age under 40, ST elevation, and recent febrile syndrome.
• After 12 months, patients with myopericarditis showed significant improvement in ejection fraction and wall motion score index, with 98% achieving normalization of cardiac function.

Conclusions:

• Myopericarditis is a common finding in patients with acute pericarditis.
• The condition demonstrates a generally benign clinical course and favorable prognosis, even in cases unrelated to vaccination.
• Myopericarditis does not appear to increase the risk of cardiac tamponade or recurrence.