Hyperthyroidism: Difference between revisions
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==Background== | ==Background== | ||
*Hyperthyroidism: Excess circulating hormone resulting from thyroid gland hyperfunction | *Hyperthyroidism: Excess circulating hormone resulting from thyroid gland hyperfunction | ||
*Thyrotoxicosis: Excess circulating thyroid hormone originating from any cause | *[[Thyrotoxicosis]]: Excess circulating thyroid hormone originating from any cause | ||
===Causes=== | ===Causes=== | ||
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**Radiation thyroiditis | **Radiation thyroiditis | ||
'''Other causes:''' | '''Other causes:''' | ||
* | *Apathetic thyrotoxicosis (elderly, masking comorbidities) | ||
*Metastatic thyroid cancer | *Metastatic thyroid cancer | ||
*Iodine-induced thyrotoxicosis | *Iodine-induced thyrotoxicosis | ||
*Amiodarone-induced thyroiditis <ref>Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders </ref> | *[[Amiodarone]]-induced thyroiditis <ref>Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders </ref> | ||
**Possible mechanisms: | **Possible mechanisms: | ||
***Drug-induced destructive thyroiditis | ***Drug-induced destructive thyroiditis | ||
***Hyperthyroidism caused by iodine load (amiodarone contains a large amount of iodine) | ***Hyperthyroidism caused by iodine load (amiodarone contains a large amount of iodine) | ||
**Drug-induced thyroiditis may also occur with interleukin-2, | **Drug-induced thyroiditis may also occur with interleukin-2, [[Interferon-α]], [[lithium]], tyrosine kinase inhibitors, HAART | ||
*[[Molar pregnancy]] | *[[Molar pregnancy]] | ||
{{Thyroid gen background}} | |||
==Clinical Features== | ==Clinical Features== | ||
[[File:PMC5384127 TJO-47-94-g6.png|thumb|Bilateral infiltrative thyroid-associated exophthalmos]] | |||
[[File:PMC3742527 OL-06-01-0144-g00.png|thumb|Enlarged and homogeneous thyroid.]] | |||
[[File:PMC3371544 IJD-57-247-g002.png|thumb|"Plummer's nail" demonstrating onycholysis (separation of the nail from the nail bed). Abnormal nail findings occurs in about 5% of hyperthyroid patients.]] | |||
'''Constitutional signs:''' | '''Constitutional signs:''' | ||
*Lethargy | *[[Lethargy]] | ||
*Diaphoresis | *Diaphoresis | ||
*Weakness | *[[Weakness]] | ||
*Fever | *[[Fever]] | ||
*Heat intolerance | *Heat intolerance | ||
*Weight loss | *Weight loss | ||
'''Neuropsychiatric:''' | '''Neuropsychiatric:''' | ||
*Emotional lability | *Emotional lability | ||
*Fine tremor | *Fine [[tremor]] | ||
*Anxiety | *[[Anxiety]] | ||
*Muscle wasting | *Muscle wasting | ||
*Confusion | *[[Confusion]] | ||
*Hyperreflexia | *Hyperreflexia | ||
*Coma | *[[Coma]] | ||
*Periodic paralysis | *[[Thyrotoxic periodic paralysis|Periodic paralysis]] | ||
*Psychosis | *Psychosis | ||
'''Ophthalmologic:''' | '''Ophthalmologic:''' | ||
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*Neck fullness/tenderness (thyroid gland) | *Neck fullness/tenderness (thyroid gland) | ||
'''Cardiorespiratory:''' | '''Cardiorespiratory:''' | ||
*Dyspnea | *[[Dyspnea]] | ||
*Widened pulse pressure | *Widened pulse pressure | ||
*Palpitations | *[[Palpitations]] | ||
*Systolic hypertension | *Systolic [[hypertension]] | ||
*[[Chest pain]] | *[[Chest pain]] | ||
*Sinus tachycardia | *[[Sinus tachycardia]] | ||
*[[Atrial fibrillation]] | *[[Atrial fibrillation]] | ||
**Occurs in 10-20% of patients and can revert to sinus rhythm when hyperthyroidism treated | **Occurs in 10-20% of patients and can revert to sinus rhythm when hyperthyroidism treated | ||
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*Sparse pubic hair | *Sparse pubic hair | ||
'''Hematologic:''' | '''Hematologic:''' | ||
*Anemia | *[[Anemia]] | ||
*Leukocytosis | *[[Leukocytosis]] | ||
'''Dermatologic:''' | '''Dermatologic:''' | ||
*Hair loss | *[[alopecia|Hair loss]] | ||
*Pretibial myxedema | *Pretibial myxedema | ||
*Warm, moist skin | *Warm, moist skin | ||
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*Onycholysis | *Onycholysis | ||
'''Apathetic hyperthyroidism:''' (elderly patients)<ref>Rehman SU et al. Thyroid Disorders in Elderly Patients. South Med J. 2005;98(5):543-549.</ref> | '''Apathetic hyperthyroidism:''' (elderly patients)<ref>Rehman SU et al. Thyroid Disorders in Elderly Patients. South Med J. 2005;98(5):543-549.</ref> | ||
*Placid | *Placid apathetic facies | ||
*Depression | *Depression | ||
*Lethargy | *Lethargy | ||
*Muscular weakness and wasting | *Muscular weakness and wasting | ||
*Excessive weight loss | *Excessive weight loss | ||
*Cardiac | *Cardiac [[dysrhythmias]] | ||
*Absent or small goiter | *Absent or small goiter | ||
*Absence of ocular symptoms | *Absence of ocular symptoms | ||
*Agitation and confusion | *[[Agitation]] and [[confusion]] | ||
==Differential Diagnosis (Tachycardia)== | ==Differential Diagnosis (Tachycardia)== | ||
*Anemia | *[[Anemia]] | ||
*Dehydration | *[[Dehydration]] | ||
*[[Fever]] | *[[Fever]] | ||
* | *[[Infection]], [[Sepsis]] | ||
*[[Anion gap acidosis]] | |||
*Anion gap acidosis | |||
*[[Hyperthyroid]] | *[[Hyperthyroid]] | ||
*[[Arrhythmia]] | *[[Arrhythmia]] | ||
*[[PE]] | *[[PE]] | ||
*[[CHF]] | *[[CHF]] | ||
*[[MI]] | |||
*[[Tamponade]] | *[[Tamponade]] | ||
*[[Myocardial contusion]] | *[[Myocardial contusion]] | ||
*Cardiac valvular disease | *Cardiac [[valvular emergencies|valvular disease]] | ||
*Hyper/[[hypoglycemia]] | *Hyper/[[hypoglycemia]] | ||
* | *[[drug overdose|Drug intoxication]] | ||
*Drug withdrawal | |||
*Toxicity | *Toxicity | ||
**ASA | **[[salicylate toxicity|ASA]] | ||
**TCA | **[[TCA toxicity|TCA]] | ||
**Anticholinergic | **[[Anticholinergic toxicity|Anticholinergic]] | ||
**Theophylline | **[[Theophylline toxicity|Theophylline]] | ||
*Pain | |||
*Psych (anger, fear) | |||
==Evaluation== | ==Evaluation== | ||
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*Free T4 (↑) | *Free T4 (↑) | ||
*Free T3 (↑) | *Free T3 (↑) | ||
===Diagnosis=== | |||
[[File:thyroid studies.JPG|px200]] | |||
==Management== | ==Management== |
Revision as of 23:23, 17 December 2019
Background
- Hyperthyroidism: Excess circulating hormone resulting from thyroid gland hyperfunction
- Thyrotoxicosis: Excess circulating thyroid hormone originating from any cause
Causes
Primary Hyperthyroidism
- Graves disease (toxic diffuse goitre)
- Toxic multinodular goitre
- 2nd most common cause
- Multiple autonomously functioning nodules [3]
- Milder, more gradual disease than Graves' hyperthyroidism
- Toxic nodular (adenoma) goitre
- Single hyperfunctioning nodule
- Similar presentation to multinodular goitre, but less common [4]
Secondary Hyperthyroidism
- Thyrotropin-secreting pituitary adenoma
- Thyroiditis
- Hashimoto thyroiditis
- Autoimmune disorder
- Thyroid antibodies and lymphocytic infiltration [5]
- Painless goitre
- Initially gland is overactive (hyperthyroidism state) followed by hypothyroidism
- Subacute painful thyroiditis (de Quervain thyroiditis)[6]
- May be caused by viral infection
- Viral prodrome followed by anterior neck pain
- Tender thyroid (palpation, head movement, swallowing)
- 50% have symptoms of hyperthyroid lasting 3 - 6 weeks
- 1/3 have hypothyroidism for up to 6 months
- Subacute painless thyroiditis [7]
- Small, non-tender goitre
- Mild symptoms
- Autoimmune
- Postpartum thyroiditis [8]
- 3 phases:
- Thyrotoxic phase 2 -6 months postpartum (20-30% have only this phase)
- Hypothyroid phase lasting 2 -3 months (but may be permanent) (40% have this phase only)
- Euthyroid phase within first postpartum year
- Some women develop permanent hypothyroidism
- 70% recurrence in subsequent pregnancies
- 3 phases:
- Suppurative thyroiditis [9]
- Rare
- Life-threatening
- Infection usually bacterial, but can be parasitic, mycobacterial, or fungal
- Usually have pre-existing thyroid disorder and immune compromise
- Radiation thyroiditis
- Hashimoto thyroiditis
Other causes:
- Apathetic thyrotoxicosis (elderly, masking comorbidities)
- Metastatic thyroid cancer
- Iodine-induced thyrotoxicosis
- Amiodarone-induced thyroiditis [10]
- Possible mechanisms:
- Drug-induced destructive thyroiditis
- Hyperthyroidism caused by iodine load (amiodarone contains a large amount of iodine)
- Drug-induced thyroiditis may also occur with interleukin-2, Interferon-α, lithium, tyrosine kinase inhibitors, HAART
- Possible mechanisms:
- Molar pregnancy
Spectrum of Thyroid Disease
- Myxedema coma << hypothyroidism < euthyroid > hyperthyroidism >> thyroid storm
Clinical Features
Constitutional signs:
Neuropsychiatric:
- Emotional lability
- Fine tremor
- Anxiety
- Muscle wasting
- Confusion
- Hyperreflexia
- Coma
- Periodic paralysis
- Psychosis
Ophthalmologic:
- Diplopia
- Lid lag
- Eye irritation
- Exophthalmos
- Ophthalmoplegia
Endocrine:
- Neck fullness/tenderness (thyroid gland)
Cardiorespiratory:
- Dyspnea
- Widened pulse pressure
- Palpitations
- Systolic hypertension
- Chest pain
- Sinus tachycardia
- Atrial fibrillation
- Occurs in 10-20% of patients and can revert to sinus rhythm when hyperthyroidism treated
- Atrial flutter
- CHF
GI:
- Diarrhea
- Hyperactive bowel sounds
Reproductive:
- Oligomenorrhea
- Gynecomastia
- Telangiectasia
Gynecologic:
- Menorrhagia
- Sparse pubic hair
Hematologic:
Dermatologic:
- Hair loss
- Pretibial myxedema
- Warm, moist skin
- Palmar erythema
- Onycholysis
Apathetic hyperthyroidism: (elderly patients)[11]
- Placid apathetic facies
- Depression
- Lethargy
- Muscular weakness and wasting
- Excessive weight loss
- Cardiac dysrhythmias
- Absent or small goiter
- Absence of ocular symptoms
- Agitation and confusion
Differential Diagnosis (Tachycardia)
- Anemia
- Dehydration
- Fever
- Infection, Sepsis
- Anion gap acidosis
- Hyperthyroid
- Arrhythmia
- PE
- CHF
- MI
- Tamponade
- Myocardial contusion
- Cardiac valvular disease
- Hyper/hypoglycemia
- Drug intoxication
- Drug withdrawal
- Toxicity
- Pain
- Psych (anger, fear)
Evaluation
Workup
- TSH (↓)
- Free T4 (↑)
- Free T3 (↑)
Diagnosis
Management
- If asymptomatic or mild symptoms, no treatment required in ED
- If symptomatic, consider Thyroid storm
Disposition
- If asymptomatic or no thyroid storm, discharge with outpatient follow-up.
- Admit for significant symptoms or thyroid storm.
See Also
References
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Thiessen, M. (2018). Thyroid and Adrenal Disorders. Rosen's emergency medicine: Concepts and clinical practice (9th ed.). Philadelphia, PA: Elsevier/Saunders
- ↑ Rehman SU et al. Thyroid Disorders in Elderly Patients. South Med J. 2005;98(5):543-549.