<unk>  is used to treat constrictive pericarditis, which is caused by a variety of conditions. It is also used to treat recurring cases of pericardial effusion.
Pericardiectomy
Pericardial window
Cardiomyoplasty
Corticotomy
Pericardiocentesis
Balloon tamponade
Pulmonary tractotomy
Ventriculectomy