What is post-cardiac injury syndrome/ Dressler's Syndrome?

Post MI with blood in pericardial cavity, syndrome may develop after cardiac op, blunt/penetrating trauma, pereforation of heart with a cath. Mimics acute viral/idiopathic pericarditis, symptom is pain of acute pericarditis 1-4 weeks after injury but earlier 1-3 days pre MI, recurrences common up to 2 years or more following the injury, fever, pleuritis, pneumonitis are features, and illness subsides 1-2 weeks. Result from HS reaction to Ag originates from injured myocardial tissue and pericardium. No tx aside from aspirin and analgesic