Friday, April 17, 2009

Sources say his tan was from Cape Cod.....

Primary Adrenal Insufficiency / Crisis

Clinical Presentation:

  • symptoms depend on the rate of decline of function and superimposed illness
  • must have a high suspicion as the presentation can be non-specific including nausea, vomiting, fatigue, weakness, fever and confusion
  • more specific aspects of the presentation include a history of weight loss, hyperpigmentation (scars, bucal mucosa), less commonly hypoglycemia
    other autoimmune diseases may be present

Underlying Etiology of Primary Adrenal Insufficiency

  • Autoimmune (Addison’s or autoimmune polyglandular dz especially type II “Schmidts syndrome”)
  • Infection: TB, HIV, fungal, CMV
  • Cancer/metasteses
  • Hemorrhage – Waterhouse-Friedrichsen (GC) or anticoagulants
  • Infarct – APLA
  • Drugs: ketoconazole, mitotane
  • Adrenomyeloneuropathy – X-linked

On Exam:

  • hypotension
  • reduced BMI
  • hyperpigmentation
  • hypogonadism – with changes in hair distribution patterns in women

Laboratory Features

  • CBC (eosinophilia, lymphocytosis)
  • Lytes: hyponatremia from decreased aldosterone (primary) or cortisol/increased ADH (secondary), hyperkalemia, hypercalcemia
  • Glucose: hypoglycaemia – more common in secondary due to glucocorticoid deficiency
  • Non-anion gap metabolic acidosis

Diagnosis

  • Should be made with serum measurements of renin, ACTH and cortisol at baseline
    diagnosis is confirmed by a cosyntropin (ACTH) stimulation test.

Treatment

  • In a ‘crisis’ needs to be initiated before the diagnosis is confirmed (due to hypotension etc)
  • short term : dexamethasone 4-8mg iv bolus can be used as it doesn’t interfere with the stim test assays
  • in patients with previous established disease hydrocortisone may be preferred due to mineralocorticoid activity
  • long term: glucocorticoid therapy with hydrocortisone, prednisone, dexamethasone + mineralocorticoid therapy with flourinef
  • consider: adrogen replacement in select circumstances
  • *** counselling re illness, surgery, pregnancy and stress steroids
  • ***medical alert bracelet

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