Changes

==Diagnosis==

==Diagnosis==

===Radiography===

===Radiography===

Radiographs are useful for the diagnosis of congestive heart failure, however they are not able to distinguish the underlying cardiomyopathy. Radiographs may reveal left atrial dilation. On the dorso-ventral projection, a classic 'Valentine heart' shape may be evident due to the marked left atrial/biatrial dilation.  Pulmonary venous conjestion, interstitial/alveolar pattern or the presence of a pleural effusion may be identified.  These findings are not specific for RCM.

Radiographs are useful for the diagnosis of congestive heart failure, however they are not able to distinguish the underlying cardiomyopathy. Radiographs may reveal left atrial dilation. On the dorso-ventral projection, a classic 'Valentine heart' shape may be evident due to the marked left atrial/biatrial dilation.  Pulmonary venous conjestion, interstitial/alveolar pattern or the presence of a pleural effusion may be identified in cases of left-sided congestive heart failure. Dilation of the caudal vena cava may be observed if right-sided congestive heart failure is present.  These findings are not specific for RCM.

===Echocardiography===

===Echocardiography===