**12. Conclusion**

Constrictive Pericarditis; It is a disorder of cardiac filling caused by a diseased, inelastic pericardium that restricts cardiac chamber expansion. Key pathophysiologic feature include dissociation of intrathoracic and intracardiac pressures and and enhanced ventricular interaction. It is a form of diastolic heart failure with different pathophysiology and treatment. It often requires special study as it resembles other forms of heart failure. It should be considered in all patients with unexplained right heart failure symptoms or signs,especially when the left ventricular ejection fraction is preserved.

Diagnosis remains challenging,and the most effective tools are designed to identify the unique pathophysiologic mechanism underlying constrictive pericarditis: dissociation of intrathoracic and intracardiac pressures and enhanced ventricular interaction. Echocardiography is very important in the diagnosis of Constrictive Pericarditis. Methods of cross-sectional imaging are as essential as hemodynamic catheterization in confirming the diagnosis. Cardiac MRI is necessary to provide information about the character of the pericardial tissue, while DGE is necessary to show the presence of significant inflammation in the pericardium and to determine medical therapy(with antiinflamatory).

Complete surgical pericardiectomy has been accepted as the only definitive treatment for patients with chronic constrictive pericarditis.
