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Endocrine System (Physiology of Endocrine System (How the pancreas…
Endocrine System
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Diabetes mellitus
Clinical signs
- polyuria
- polydipsia
- polyphagia
- weight loss
- cataracts in dog
- weakness
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Aetiology
Type I
- Pancreatitis
- Immune destruction of Beta cells
- Inherited disorder
- Amyloidosis
Type II
- Down regulation of insulin receptors
- Insulin receptor antagonism
- Obesity
Hypothyroidism in dogs
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Clinical signs
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skin
- dryness, excessive shedding, delayed regrowth of hair, and hair thinning or hair loss (usually the same pattern on both sides), sometimes associated with increased pigmentation over points of wear
- severe cases, the skin can thicken, especially on the forehead and face, resulting in a puffy appearance and thickened skin folds above the eyes
non-neutered dogs
- Bitchs may have irregular or no heat cycles and become infertile, or litter survival may be poor.
- Males may have lack of libido, small testicles, low sperm count, or infertility.
Diagnosis
- Routine blood tests
- Screening test of total thyroxin (TT4) level.
- Antibody testing
- Administration of thyroid-stimulating hormone
- Ultrasonography or scintigraphy of the thyroid gland
- A therapeutic drug trial.
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Hyperthyroidism in cats
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Clinical Signs
- Palpable thyroid gland (80% of cases)
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- Matting and very long nails
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- Cardiac arrhythmias/Cardiac disease
- Hypertension (15 – 20% of cases)
Diagnosis
- Enlarged thyroid gland by palpation
- Nuclear medical scan of the thyroid gland
- CBC and urinalysis
- Platelet counts
- High basal serum total thyroid hormone concentration
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- Mineralcorticoids: aldosterone
- Adrenaline and noradrenaline
- Less than 5% of cases
- Impaired secretion of thyroid stimulating hormone (TSH)
- Secretes hormone thyroxine, T4 and triiodothyronine,T3 which controls metabolic rate and is essential for normal growth.
- Also secretes calcitonin which decreases resorption of calcium from the bones as a result of raised blood calcium levels
Thyroxine, T4 and triiodothyronine, T3
- Present in the body as a pair of adrenal glands, one lying close to the cranial pole of each kidney.
- Function is to help regulate in body’s metabolism, immune system, blood pressure, response to stress, salt and water balance and other essential functions.
- lymphocytic thyroiditis or idiopathic thyroid gland atrophy
- 95% of cases due to gradual destruction of the thyroid gland
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- Thyroxine administration:
Levothyroxine: 0.02mg/kg PO q12h
Liothyronine: 0.04 – 0.06 mg/kg P0 q8h
- Treatment must be tried for 4 to 8 weeks before any changes in coat and body weight can be evaluated. Once the hair coat begins to improve, some dogs can be maintained on once daily medication.
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- Most common cause
- Involves one or both lobes of the thyroid gland
- Causes high circulating concentrations of T4 and T3
- Both lobes are enlarged in approximately 70% of cases
- Only 1% to 2% of cats with hyperthyroidism
- Methimazole: 2.5mg PO q8h for 2 – 3 weeks
- Ipodate sodium: 50mg PO q12h for 2 weeks
- Removal of the abnormal thyroid tissue, leaving the normal adjacent tissue alone.
- Administering a small dose of radioactive iodine which only overactive thyroid tissue will absorb. The radiation destroys the abnormal cells while the normal thyroid tissue continues to function
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Cushing's disease, an abnormal condition marked by the presence of an excess of adrenocortical hormones and especially cortisol in the body
endocrine alopecia
thin skin, comedones
hepatomegaly/abdominal distention
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