Difference between revisions of "Hypertrophic Cardiomyopathy"

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Revision as of 10:42, 22 September 2008


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CARDIOLOGY
()Map CARDIOVASCULAR CONDITIONS (Map)



Hypertrophic cardiomyopathy (cat). Courtesy of T. Scase
Hypertrophic cardiomyopathy (cat). Courtesy of T. Scase
  • Rare in dogs
  • Common in cats

Signalment

Dogs: Rare

Cats: Pedigrees (e.g. Persians, Maine Coons) & mixed breeds; Occurs in young pedigrees and young to old mixed breeds; Male>Female


Description

  • Left ventricular concentric hypertrophy without an identifiable cause is known as hypertrophic cardiomyopathy. The ventricular myocardium becomes so thick that the lumen is reduced to a size that is not compatible with maintaining the heart's function as a pump. The left ventricle no longer has the capacity to hold normal volumes of blood during diastole. As a result, the left atrium dilates from the increased pressure and volume of blood backing up into the lungs.


Diagnosis

History & Clinical Signs

-Asymptomatic

-Hindlimb paresis or weakness (saddle thrombus see in cats)

-Signs of left-sided heart failure


Physical Exam:

-Systolic murmur

-Ventricular arrhythmias


Radiography=

-Left atrial enlargement

-Enlarged heart

-Pulmonary congestion & edema


Electrocardiography (ECG)=

-Tall R wave

-Wide QRS

-Ventricular arrhythmias

-Conduction disturbances

-Sinus tachycardia


Echocardiography

-Left ventricular concentric hypertrophy

-Left atrial enlargement

-Mitral valve insufficiency


Treatment

-Treat the individual symptoms

Contraindications: Arterial Vasodilators; Positive Inotrops


Prognosis

-Poor for symptomatic cats