**6.1 Diagnosis of constrictive pericarditis**

Sometimes we can see a calcium shell surrounding the heart in the chest X-ray, but it is not the most frequent [31]. Other nonspecific radiographic findings are dilation of the superior vena cava [12].

In the electrocardiogram there are no specific signs, either atrial fibrillation, nonspecific alterations of repolarization (changes in the T wave), or complexes with low voltage.

The Doppler echocardiogram may show thickening of the pericardium; the presence of fibrin; restrictive transmitral filling pattern, associated with normal size of the cavities, in the absence of ventricular hypertrophy; and valvular insufficiency.
