Clinical features and anti-heart autoantibody (AHA) status in idiopathic recurrent acute pericarditis
| AHA positive (n=25) | AHA negative (n=15) | p Value | |
| Age at onset (years) | 38±16 | 36±16 | NS |
| Male/female | 15/10 | 10/5 | NS |
| Symptoms (years) | 6±9 | 4±3 | NS |
| Follow-up (years) | 9±11 | 7±4 | NS |
| Recurrences | 7±9 | 5±3 | NS |
| Recurrences/year | 2±1 | 1±1 | NS |
| Hospital admissions | 3±2 | 2.5±1 | NS |
| End-diastolic septal thickness (mm) | 10±1 | 9.5±1 | NS |
| End-diastolic posterior wall thickness (mm) | 9±2 | 8±1 | NS |
| Left ventricular ejection fraction (%) | 61±4 | 64±3 | NS |
| Immunosuppressant agents and/or pericardiectomy (%) | 6 (24) | 1 (7) | NS |
| Drug combination at last follow-up (%) | 10 (40) | 2 (13) | 0.07 |