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Prodromal symptoms predict myocardial involvement in patients with acute idiopathic pericarditis.

BACKGROUND: Myocardial involvement is common in acute idiopathic pericarditis and can, in some cases, lead to life-threatening complications. Acute idiopathic pericarditis is often preceded by various prodromal symptoms, but whether these symptoms can predict myocardial involvement is unclear. The aim of the study was to examine the value of different prodromal symptoms of acute idiopathic pericarditis for predicting myocardial involvement.

METHODS AND RESULTS: Patients diagnosed with acute idiopathic pericarditis in 2007-2017 at our hospital were identified by database search. Demographic parameters, levels of plasma cardiac troponin and creatine kinase, and findings on echocardiography, magnetic resonance imaging, cardiac computed tomography and coronary angiography and data on prodromal symptoms were extracted from the medical files. The final cohort included 239 patients (73.2% males) aged 18-89 years. The most common prodromal symptoms were fever, chills, cough, sore throat, abdominal pain, and diarrhea. Myocardial involvement was observed in 83 patients (34.7%), leading to cardiogenic shock in 4 (4.8%). Patients with myocardial involvement more often had prodromal diarrhea, fever, sore throat, vomiting, atypical chest pain, and pharyngitis. On multivariate analysis, diarrhea, sore throat and fever were strong independent predictors of myocardial involvement (OR, 14.257, 95% CI, 3.920-51.782, p < 0.001, OR, 9.6, 95% CI, 2.934-31.982, p < 0.001 and OR, 2.445, 95% CI, 1.077-5.550, p = 0.025). Diarrhea was associated with left ventricular dysfunction as well.

CONCLUSIONS: In acute idiopathic pericarditis, prodromal diarrhea, sore throat and fever strongly predict myocardial involvement, resulting in life-threatening hemodynamic compromise in a minority of the patients.

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