A 52-year-old woman presents with exeional fatigue and ascites. She is noted to have a rapid, irregular pulse rate. The chest X-ray reveals a small hea with calcification seen on the lateral view. The 12-lead ECG demonstrates low QRS voltage. Clinical diagnosis is?
Rheumatic pan-carditis Constrictive pericarditis Restrictive cardiomyopathy Acute cor-pulmonale