TV4101 - Degenerative Valvular Disease in Dogs

Various names including?

Endocardiosis
Mitral Valve Disease
Mitral Valve Insufficiency (MVI)
Myxomatosis Mitral Valve Disease -MMVD

Mainly effects who?

Which valves are affected?

Small Dog breed - Cavalier King Charles Spaniel, Daschund Toy Poodle, etc

• Can occur in large breeds but predominantly smallies

Mitral valve most common
Tricuspid in 30% of cases
Little leaks of aortic and pulmonic valves is seen too

CX?

Tachypnoea / Tachycardia
Loss of sinus rhythm
Syncope
Systolic murmur
Dyspnoea and cyanosis in severe cases
Coughing - controversial if involved or not

What can we see? Significance?

Sometimes b4 you see obvs congestion you see these enlarged pulmonary veins preceding oedema development

Consequences of MVI

Volume ovetload → LV stretches and enlarged LA → LV enlarge → Pulomary BV become distended → cardiogenic oedema