Changes

===Diagnostic Imaging===

===Diagnostic Imaging===

====Radiography====

====Radiography====

Early in the course of DMVD, thoracic radiographs will be normal. As the disease progresses, cardiomegaly will become apparent. There may be evidence of left atrial enlargement, with or without dorsal displacement of the trachea and narrowing of the mainstem bronchus. Pulmonary venous distension may be observed if there is increased pulmonary venous pressure. Interstitial pulmonary oedema may precede alveolar pulmonary oedema. Evidence of right sided congestive heart failure maybe present in severe cases, radiographic findings include distension of the caudal vena cava, hepatomegaly, ascites and pleural effusion.

Early in the course of DMVD, thoracic radiographs will be normal. As the disease progresses, cardiomegaly will become apparent. There may be evidence of left atrial enlargement, with or without dorsal displacement of the trachea and narrowing of the mainstem bronchus. Pulmonary venous distension may be observed if there is increased pulmonary venous pressure. Interstitial pulmonary oedema may precede alveolar pulmonary oedema. Evidence of [[Heart Failure, Right-Sided|right-sided congestive heart failure]] may be present in severe cases, radiographic findings include distension of the caudal vena cava, hepatomegaly, ascites and pleural effusion.

====Echocardiography====

====Echocardiography====