Need 2 of the following diagnostic criteria for acute pericarditis
Chest pain (typically sharp and pleuritic, improved by sitting up and leaning forward)
Pericardial friction rub
New or worsening pericardial effusion
Suggestive ECG changes
Chest pain (typically sharp and pleuritic, improved by sitting up and leaning forward)
Pericardial friction rub
New or worsening pericardial effusion
Suggestive ECG changes
AND
Appropriate time-frame: 1 week to approximately 3 months after cardiac injury
Dressler's syndrome
CHF
Ogilvie's syndrome
PE
Wellens' syndrome
Pneumonia
Twiddler's syndrome
Pneumothorax