SDL- Ferret Case

History:

- 9month old intact jill ferret

- Gradually worsening lethargy over past 10 days

- Anorexia for 24hrs

- Housed with 5yr castrated male and 7month female who are normal

- Fed commercial dried ferret food and tinned cat food

Clinical Exam

- Pale MM

- HR 290

- RR 40

- Temperature 36

- Tarry black perianal faecal staining

- Prominent swollen volva

What is the problem list?

- Lethargy over 10 days

- Anorexia

- Pale MM

- Tachycardia

- High RR

- Hypothermic

- Tarry black faecal staining

- Prominent swollen volva

Write a differentials list based on the history and clinical signs?

- Hyperestrogenism

- Hyperadrenocorticism

- Insulinoma

- Ovarian neoplasia

- Hypoglycaemia

What immediate actions would you perform when presented with this ferret to stabilise them?

- Oxygen therapy

- IV fluids

- Active warming

- Monitor parameters

What diagnostics would you prioritise in this case if the owner was concerned about finances?

- Haematology

- Blood glucose levels

What diagnostics would you perform if the owner was not concerned about financials?

- Haematology and biochemistry (check for anaemia, thrombocytopenia and leukopenia)

- Abdominal ultrasound to assess adrenal glands

- Coagulation clotting times

- Serum hormonal assay of oestradiol

The owner consented to haematology and glucose tests and the results are shown. What is your primary diagnosis based on these results and why?

Hyperestrogenism

Shown by:

- Non regenerative anaemia

- Leukopenia

- Thrombocytopenia

how does hyperoestrogenism occur

• Persistent oestrus causes high levels of oestrogen which suppress the bone marrow

• If mating does not occur, females may develop aplastic anaemia with pancytopenia after a prolonged oestrus (generally up to 6 months).

• The maintained production of oestrogen by the follicles causes this.

Hyperestrogenism may be secondary to prolonged oestrus in female ferrets (either intact or neutered with ovarian remnant), adrenal disorders, or, rarely, oestrogen-producing tumours

What is aplastic anaemia with pancytopenia?

Aplastic anaemia with pancytopenia = bone marrow failure causing a severe reduction in red cells, white cells (often neutrophils but any WBCs can be affected), and platelets

What treatment would you suggest to the owner?

- Whole blood transfusion due to anaemia and thrombocytopenia

- Ovariohysterectomy would be ideal but the ferret is a poor surgical candidate due to the anaemia and thrombocytopenia

- Use hCG to stimulate ovulation (can be repeated in 7 days if vulvar swelling has not gone)

- Provide supportive feeding

- If the thrombocytopenia is not improved with the blood transfusion place on broad spectrum antibiotics to prevent secondary infections

What would be the prognosis for this ferret?

Guarded to poor

why cant the deslorelin implant be used to treat hyperoestrogenism

Deslorelin is slow releasing-> so cant be used in an emergency situation, but can be used once stabilised and if don’t want to spay

Why is there a link between ovariohysterectomy and hyperadrenocorticism in ferrets?

• In ferrets, early neutering removes the gonads and their negative feedback on the pituitary, causing persistently high LH and FSH levels.

• This chronic stimulation of LH receptors in the adrenal glands leads to adrenal hyperplasia or tumours, which begin producing sex steroids like oestrogen and androgens that the gonads would normally make.

What advice would you offer the owner on preventing this from happening in her other female ferret?

Recommend hormonal neutering with a long acting GnRH agonist (Deslorelin implant) or can mate with a vasectomised male

How would deslorelin prevent or treat adrenal disease causing hyperoestrogenism in ferrets?

Suppressing LH release → removing the stimulus for adrenal hyperplasia → reducing excess sex hormone production.

That's why deslorelin is both a contraceptive and a treatment for adrenal-associated endocrinopathy in ferrets.

What is hyperestrognism ?

oestrogen toxicity

when are transfusions in ferrets reccomended

when hct value lower than 25%

what are the causes of hyperestogenism ?

persistant oestrus - induced ovulatory, remain in oestrus until mated - over 1 month may lead to hyperestrogenism

adrenocortical disease, ovarian abnormalities - neoplasia, cystic disease, ovarian remnant syndrome

what are the clinical signs of hyperestrogenism ?

may be non-specific

- lethargy/ weakness

- reduced appetite

- pale mm, petechial or ecchymotic haemorrhages

- melena

- vulval swelling and discharge

- bilaterally symmetrical dorsal or flank alopecia

Acute signs of hyperestrogenism

sudden collapse

anorexia

Predisposition to hyperoestrogenism

an intact female jill that is reproductively active - typically over 3 years

breeding season - increasing photoperiods - late winter and spring

why can adrenocortical disease cause hyperestrogenism

when a jill is surgically neutered early - removing the gonads - loss of negative feedback in the hypothalamopituitary-gonadal axis, causing the pituitary gland to release high levels of gonadotropins that continuously stimulate the adrenal glands to produce sex hormones instead of cortisol

exposed to prolonged photoperiods

pthogphysiology of hyperestrogenism

prolonged exposure to oestrogen

- bone marrow suppression - blood cell formation

- secondary infection

- bleeding - prolonged clotting times

- androgenic hormone = affects hair growth cycle - alopecia

common client history of hyperestrogenism

- adult female - single sex household or alone

- usually associated with first oestrus

- or surgically neutered

considerations when treating hyperestrogenism

- bone marrow depression - anaemia, leukopenia, thrombocytopenia - range from mild-severe

- significant haemorrage - result from handling and diagnostic procedures

- medical stabilisation indiacted before surgery

How do you diagnose hyperoestrogenism ?

- clinical history

- identify anaemia, leukopenia, thromocytopenia pcv

Gross Autopsy of hyperestrogenism

- pale tissues

- petichial and ecchymotic haemorrhage

- subdural haematoma

- haemorrhage in GI tract

- uterine abnormalities

- enlarged adrenal glands

- ovarian abnormalities

what else could cause clotting disorders in ferrets ?

- rodenticide toxicity

- hepatic disease

- haemorrhage

- immune mediated

What could cause alopecia in ferrets?

- seasonal

- ectoparasites

- dermatophytosis

- mast cell tumour

Initial symptoimatic treatment for hyperestrogenism

- IV fluids

- whole blood transfusion - not blood groups

- nutritional support

reduce oestrogen levels

- hCG - once and then again in 7 days

treat concurrent disease

- abx

Long term treatment options for hyperestrogenism

Surgical: ovariohysterectomy Ovariohysterectomy.

Hormonal: deslorelin implant Deslorelin - need to be repeated at regular intervals depending on the dose/size of implant used.

advise to monitor return of vulval swelling, ie evidence of estrus, particularly during periods of increasing photoperiod. This would indicate loss of efficaciousness and would indicate a need to provide repeat administration.

Mating with a vasectomized male may be used to suppress estrus in females, which will induce ovulation with subsequent pseudopregnancy.

what risk does surgical neutering hold ?

- increased incidence of adrenocortical disease in ferrets.

- ovarian remnant - hyperestrogensim

-ga risks