Endocrine Emergencies Ppt
Transcript of Endocrine Emergencies Ppt
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Inpatient Endocrine Emergencies
Michael Shannon, MDProvidence Endocrinology, Olympia WA
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Endocrine Inpatient Issues
Hyperthyroidism and thyroid stormMyxedema comaNon-thyroidal illnessAcute adrenal insufficiencyHypercalcemiaPituitary apoplexy
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Diabetes in Hospital Settings
Estimated that 18% of admissions have diabetes, and that diabetics account for 24% of the length of stay for all inpatient daysThere is improved recognition that elevated sugars are not benign from stress and lead to (increasingly uncompensated) complications such as urinary tract infections, poor wound healing, and dehydration
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Thyroid Storm
Thyroid storm is an extreme form of thyrotoxicosis (usually with a precipitating cause – MI, infection)Manifested by marked delirium, severe tachycardia, dehydration, and very high fever;Diagnosis is history and physical; labs show very low TSH, high free T4 and T3 (TSH is most reliable)
Franklyn JA, NEJM 1994.
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Hyperthyroid vs Thyroid Storm
Note that findings are not different than that of hyperthyroidism, but the difference is in the setting; key is fever (typically > 40 C / 104 F)You can be admitted with hyperthyroidism that is severe yet is not thyroid storm (hyperthyroid tachyarrhythmias are serious but not “storm”)Thyroid hormone levels are not much different in storming than in other cases so likely other predisposing factors (stress, metabolic factors)
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Etiology of Thyroid Storm
Most thyroid storm is from Graves’ diseaseVery small number of cases from toxic nodule or multi-nodular goiterUsually unstable for scan; TSI Ab helpful
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Treatment of Thyroid Storm
This is an ICU level admissionMajor part is supportive care with hydration, cooling blankets, and antipyretics (acetaminophen)Avoid aspirin (case reports that it releases thyroid hormone from its binding globulin, worsens case)Intensive therapy with anti-thyroid drugs, beta-blockers, steroids, iodine solutions
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Treatment of Thyroid Storm
1. Beta-blockade: propranolol 20-60 mg q6h (can also give intravenously)
2. Anti-thyroid drugs: Usually methimazole used for outpatients, but here PTU at high doses will both lower synthesis and T4->T3 peripheral conversion; 150 mg q6hrs
3. Iodine agents4. Steroids
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Treatment of Thyroid Storm
1. Beta-blockade2. Anti-thyroid drugs3. Iodine agents: utilize the Wolff-Chaikoff effect
where high dose iodine suppresses thyroid hormone production (hard to find: SSKI drops or Lugol’s solution – popular with naturopaths)
4. Steroids: dexamethasone 2 mg q6h to drop circulating T3 levels and suppress T4 -> T3 conversion
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Myxedema Coma
Severe hypothyroidism with metabolic shutdown (cardiac, hepatic, other organs)Often comatose or deliriousDry coarse skin, hoarse gravelly voice, thin dry hairHypothermiaPericardial and pleural effusions
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Myxedema: Pathophysiology
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Myxedema: Diagnosis and Etiology
Diagnosis is made with clinical scenario and TSH through the roof – usually >80Can also have a very low free T4 with a slightly elevated TSH if pituitary failure (rare)Three major etiologies:
Undiagnosed hypothyroidism (autoimmune thyroiditis, radiation hypothyroidism, etc)More commonly discontinuation of therapy or running out of medication (for months)Iatrogenic: stopping patients for I-131 cancer Rx
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Myxedema Treatment
Initial therapy is supportiveRewarming protocolSupport BP and respiration (usually low-output CHF)
Levothyroxine: 250 mcg intravenous x 3 days load, then 100 mcg (or old dose) orally per dayMay use liothyronine (Cytomel) 12.5 mcg TID x3 days
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Nonthyroidal illness (NTI)
Also known as euthyroid sick syndrome; this occurs when there is inhibition of the thyroid deiodinase, reducing the levels of T3This is “all levels down” thyroid pattern; decreased TSH, decreased T4, decreased T3Challenge is differentiating thyroid levels as a result of illness versus the cause of it (classic conundrum: manic episode with TSH 0.2)
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Nonthyroidal illness: Lab Patterns
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Diagnostic Challenges: NTILow FT4: NTI versus hypothyroidism; use the TSH
Clinical signs, eg bradycardia, hypoventilation, hypothermia>20 mU/ml: primary hypothyroidism5-20: primary hypothyroidism vs NTI; repeat in 1-2 weeks or treat empirically and reassess as outpatient<5: NTI vs secondary hypothyroidism; History or evidence of pituitary disease?
Low TSH: NTI vs hyperthyroidism; use the free T4Clinical signs, including atrial fibrillation
Low-normal : probably NTI, especially if TSH >0.1 μU/mlHigh: hyperthyroidism
For modest deviations – time is your friend!
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Adrenal Insufficiency and Crisis
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Adrenal failure: Presentation
Weakness & fatigueAnorexia & weight lossNausea & vomitingDizziness and orthostatic symptomsLethargy, stupor
HyponatremiaHypotensionShock & death
Hyperkalemia*Hyperpigmentation*
*Only in primary adrenal failure
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Dusky Hyperpigmentation
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Adrenal failure: causes
Primary (cortisol & aldosterone deficient)AUTOIMMUNEtuberculosis, fungal infectionsHemorrhage, sepsis, etc
Secondary (ACTH & cortisol deficient)GLUCOCORTICOID THERAPYhypothalamic or pituitary lesions
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Adrenal failure: evaluation
Dexamethasone 10 mg IV if hypotensiveCortrosyn stimulation test:
Cortrosyn 250 mcg IVPlasma cortisol @ 60 minNormal: >20 mcg/dL or stimulate > 9 mcg/dLNot sensitive for new onset secondary adrenal Not sensitive for new onset secondary adrenal failurefailure
Eg, after pituitary surgery, pituitary apoplexyTreat empirically with prednisone for 4 weeksHold prednisone AM of test
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Adrenal failure:emergency therapy
Indications:HypotensionStupor/deliriumSevere abdominal pain and intractable nauseaSevere hyperkalemia or hyponatremia
Hydrocortisone 100 mg IV Q 8 hrD5/normal saline to hydrateThen double the outpatient dose for three daysGet them a Medic-Alert bracelet!
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Failures of Adrenal Treatment
Running out of meds, no sick day plan, no bracelet.
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Steroid coverage
Indications:Known adrenal failureChronic steroid treatmentRecent (1 year) chronic steroid treatment (prednisone 7.5 mg/dayfor two months in the last twelve)
For severe illness, major surgery:Hydrocortisone 50 mg IV Q 8 hr
For moderate illness, minor surgeryHydrocortisone 25 mg IV Q 8 hr
Post-op or during hospitalization, double dose for three days then taper to chronic replacement over 2-3 days
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Hypercalcemia: Presentation
System Common--------------------------------Rare
CNS Fatigue, weakness, depression, confusion
GI Constipation, anorexia, N+V, pancreas
Renal Poly’s, dehydration, stones, calcinosis
Cardiac --------palp, rhythm, brady, short QT
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Hypercalcemia: Differential
Common Uncommon Rare
Primary HPTHMalignancy
Milk-AlkaliSarcoidosisDrugs (Li, VitD)Renal failureTPNThyrotoxicosis
Pheo, VIPomaFHHTuberculosisHistoplasmosisHypoAlkPhosImmobilization
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Hypercalcemia: Malignancy
1. PTHrP (i.e. squamous cell carcinoma)2. Cytokine release (i.e. multiple myeloma)3. Lytic bone disease (i.e. breast cancer)4. Excess Vitamin D production (i.e.
lymphoma)
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Hypercalcemia: When to Treat
Severe symptoms of hypercalcemiaPlasma [Ca] >13 mg/dlWhere possible send laboratories beforehand
Calcium with intact PTHIf PTH is anything but low or low-normal, it is primary hyperparathyroidism
If malignancy, consider no treatment – there are worse deaths than hypercalcemic delirium (average lifespan is 6 weeks with this)
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Severe hypercalcemia: therapyRestore ECF volume
Normal saline rapidlyPositive fluid balance >2 liters in first 24 hr
Saline diuresisNormal saline 100-200 ml/hrReplace potassiumOnly after full volume repletion
Zoledronic acid 4 mg IV over 15 minIf plasma [Ca] >14 mg/dl or >12 mg/dl after rehydrationMonitor plasma calcium QD
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Pituitary Apoplexy
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Pituitary Apoplexy
Hemorrhage into a pituitary adenoma; sudden increase in pressure typically presents with severe headache, nausea, vomitingSevere headache usually leads to CT/MRI showing pituitary mass with acute bleedingThis is a neurosurgical emergency if severe enough, if the hemorrhage endangers optic chiasm; need surgery unless prolactinomaGoal is to check/replace steroids and thyroid
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A hospital is no place to be sick.
Samuel Goldwyn (1882-1974)
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Question and Answer
Thank you for allowing me to review endocrine consult issues and support your patients’ endocrine needs.