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Congestive heart failure associated with hyperthyroidism in cats.

G Jacobs, C Hutson, J Dougherty

    Journal of the American Veterinary Medical Association
    |January 1, 1986
    PubMed
    Summary
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    Hyperthyroidism in cats can cause congestive heart failure, leading to symptoms like difficulty breathing and poor appetite. Early diagnosis and treatment are crucial but outcomes can be poor.

    Area of Science:

    • Veterinary Cardiology
    • Small Animal Internal Medicine
    • Endocrinology

    Background:

    • Feline hyperthyroidism is a common endocrine disorder in older cats.
    • Congestive heart failure (CHF) is a potential sequela of untreated or severe hyperthyroidism.
    • This study investigates the clinical presentation and outcomes of hyperthyroid cats with concurrent CHF.

    Observation:

    • Four cats with confirmed hyperthyroidism presented with signs of congestive heart failure.
    • Clinical signs included dyspnea, anorexia, cardiac murmurs (holosystolic apical), and gallop rhythms.
    • Physical examination revealed palpable thyroid enlargement and weight loss in all affected cats.

    Findings:

    • Radiography demonstrated moderate-to-severe pleural effusion, cardiomegaly, and signs of pulmonary venous engorgement/edema.

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  • Echocardiography revealed cardiac dilation and reduced left ventricular shortening fraction (indicating impaired systolic function).
  • Laboratory and ECG findings were consistent with typical feline hyperthyroidism.

    • Implications:

    • Hyperthyroidism should be considered in cats presenting with congestive heart failure, even without typical signs.
    • Aggressive management of both hyperthyroidism and cardiac disease is necessary.
    • Prognosis for hyperthyroid cats with CHF remains guarded, with significant mortality risk even with treatment.