Hypothyroidism
Hypothyroidism
Aussi appelé: Canine hypothyroidism, Thyroid hormone deficiency
En bref
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 frequent et tres traitable; traitement quotidien restaure energie et pelage.
Lethargie et pelage terne se confondent avec le vieillissement.
Qu'est-ce que c'est ?
Thyroid underproduces T4/T3; metabolism slows. Mostly dogs (lymphocytic thyroiditis or idiopathic atrophy). Rare in cats; often iatrogenic after hyperthyroid treatment.
Causes et facteurs de risque
Primary gland damage common. Middle-aged dogs (often 2-6 y); genetic breeds may present earlier.
Signes à surveiller
- Lethargy, weight gain, endocrine alopecia (common)
- Dull coat; pyoderma; hypercholesterolemia (common)
- Bradycardia; myxedema (occasional)
Alopécie en queue de rat: signe dermatologique classique.
Comment les vétérinaires diagnostiquent
TT4, free T4 by equilibrium dialysis, endogenous TSH, TGAA. Rule out euthyroid sick syndrome.
Le bilan thyroidien complet confirme le diagnostic.
Options de traitement
Lifelong Levothyroxine. Energy often improves in 1-2 weeks; coat over weeks to months. Retest T4 about 4-6 h post-pill.
Pronostic
Excellent with correct dosing. Daily lifelong therapy required.
Prévention
No primary prevention. Breeders: TGAA/thyroid panel. Interpret sighthound/Nordic T4 ranges carefully.
Quand appeler le vétérinaire
Check unexplained weight gain, chronic skin disease, persistent lethargy. Emergency myxedema coma: stupor, collapse, hypothermia, dyspnea.
Sources
- Veterinary Internal Medicine, pp. 774, 775, 779, 786, 788.
My highlights & notes
Signes et symptômes
Races à risque plus élevé
Comment c’est diagnostiqué
- 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
Approches de traitement
Le traitement doit être prescrit par un vétérinaire agréé selon votre animal. Les doses précises ne sont volontairement pas affichées.
Questions fréquentes
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?
Le traitement doit être prescrit par un vétérinaire agréé selon votre animal. Les doses précises ne sont volontairement pas affichées.
Sources
- 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
Cet article est informatif et ne remplace pas un avis vétérinaire. Si votre animal est malade, consultez un vétérinaire.
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