Hypothyroidism
Hypothyroidism
Também conhecido como: Canine hypothyroidism, Thyroid hormone deficiency
Em resumo
Hypothyroidism is a common endocrine disorder in dogs caused by an underactive thyroid gland. It slows down metabolism, leading to weight gain, lethargy, and skin issues, but is highly manageable with daily thyroid hormone replacement therapy.
TL;DR. Deficit hormonal frequente e muito tratavel; medicacao diaria restaura energia e pelagem.
Letargia e pelagem opaca se confundem com o envelhecimento.
O que é?
Thyroid underproduces T4/T3; metabolism slows. Mostly dogs (lymphocytic thyroiditis or idiopathic atrophy). Rare in cats; often iatrogenic after hyperthyroid treatment.
Causas e fatores de risco
Primary gland damage common. Middle-aged dogs (often 2-6 y); genetic breeds may present earlier.
Sinais a observar
- Lethargy, weight gain, endocrine alopecia (common)
- Dull coat; pyoderma; hypercholesterolemia (common)
- Bradycardia; myxedema (occasional)
Alopecia em cauda de rato: sinal dermatologico classico.
Como os veterinários diagnosticam
TT4, free T4 by equilibrium dialysis, endogenous TSH, TGAA. Rule out euthyroid sick syndrome.
O painel tireoidiano completo confirma o diagnostico.
Opções de tratamento
Lifelong Levothyroxine. Energy often improves in 1-2 weeks; coat over weeks to months. Retest T4 about 4-6 h post-pill.
Prognóstico
Excellent with correct dosing. Daily lifelong therapy required.
Prevenção
No primary prevention. Breeders: TGAA/thyroid panel. Interpret sighthound/Nordic T4 ranges carefully.
Quando chamar o veterinário
Check unexplained weight gain, chronic skin disease, persistent lethargy. Emergency myxedema coma: stupor, collapse, hypothermia, dyspnea.
Fontes
- Veterinary Internal Medicine, pp. 774, 775, 779, 786, 788.
My highlights & notes
Sinais e sintomas
Raças de maior risco
Como é diagnosticado
- Baseline serum free T4 (fT4) concentration by equilibrium dialysis
- Baseline serum total T4 (TT4) concentration
- Complete Blood Count (CBC)
- Endogenous thyroid-stimulating hormone (TSH) assay
- Serum Biochemistry Panel
- Thyroglobulin autoantibody (TGAA) assay
Abordagens de tratamento
O tratamento deve ser prescrito por um veterinário licenciado. As doses específicas não são mostradas de propósito.
Perguntas frequentes
What is Hypothyroidism?
Hypothyroidism is a common endocrine disorder in dogs caused by an underactive thyroid gland. It slows down metabolism, leading to weight gain, lethargy, and skin issues, but is highly manageable with daily thyroid hormone replacement therapy.
What are the symptoms of Hypothyroidism?
Dull, dry haircoat、Endocrine alopecia、Hypercholesterolemia、Lethargy、Nonregenerative anemia、Pyoderma、Weight gain、Tiring easily during activity
How is Hypothyroidism diagnosed?
Baseline serum free T4 (fT4) concentration by equilibrium dialysis、Baseline serum total T4 (TT4) concentration、Complete Blood Count (CBC)、Endogenous thyroid-stimulating hormone (TSH) assay、Serum Biochemistry Panel、Thyroglobulin autoantibody (TGAA) assay
How is Hypothyroidism treated?
O tratamento deve ser prescrito por um veterinário licenciado. As doses específicas não são mostradas de propósito.
Fontes
- Internal Medicine 5th · p. 774
- Internal Medicine 5th · p. 788
- Internal Medicine 5th · p. 775
- Internal Medicine 5th · p. 779
- Internal Medicine 5th · p. 786
Este artigo é educação geral e não substitui orientação veterinária. Se o pet estiver mal, consulte um veterinário.
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