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ICS Lecture 11: Thyroid and Parathyroid
Thyroid Gland
Characteristics
TSH Stimulates T3 and T4 Release
Metabolism Regulation
Blood Calcium Sensor
Calcitonin Release
Blood Calcium Decreases
Bone Building
2 mins
Thyroid Nodule Assessment
Initial Tests
Thyroid-Stimulating Hormone (TSH)
Ultrasound
Normal / Elevated TSH
Fine Needle Aspiration
Most Accurate Test
Decreased TSH
Radioactive Iodine Uptake (RAIU)
Hot Nodules Rarely Malignant
Free T3 and T4
Considerations
Repeat Ultrasound 6 -18 Months
2 mins
Thyroid Function Screening Tests
If TSH High
Free T4 (FT4)
If TSH Low
Free T4 (FT4) and T3 (Triiodothyronine)
Consider Serum Total T4 (Thyroxine)
Considerations
Only Total T4 Increases in Pregnancy
T4 is Converted to T3
Avoid for Inpatient Screening
2 mins
Hyperthyroidism Assessment
Assessment
Heat Intolerance
Exophthalmos
Warm, Moist Skin and Silky Hair
Tremors
Goiter
Diarrhea
Weight Loss
Tachycardia
Hypertension
Amenorrhea
Diagnosis
Decreased TSH with Elevated Free T4
Radioactive Iodine Uptake (RAIU)
2 mins
Hyperthyroidism Interventions
Drug Therapy
Propylthiouracil (PTU)
Methimazole (Tapazole)
Iodine
Beta Blockers
Other Therapies
Radioiodine Ablation
Thyroidectomy
Complications
Thyrotoxicosis
Post-Surgery Hypocalcemia
2 mins
Graves' Disease Characteristics
Women 20-40 years old
Pathophysiology
Anti-TSH Receptor Antibodies
Symptoms
Ophthalmopathy
Exophthalmos
Hyperthyroidism
Goiter
Pretibial Myxedema
1 min
Graves' Disease Labs and Treatment
Labs
Decreased TSH
Increased T3
Increased T4
Radioactive Iodine Uptake (RAIU)
Treatment
Beta blocker
Methimazole
Radioiodine Ablation
1 min
Thyroid Storm
Symptoms
Diarrhea
Liver Failure
Insulin Resistance
Tachycardia
Lid lag
Change in LOC (Altered Mental Status)
High fever
Treatment
Propranolol (Or Esmolol)
PTU (Thionamides) Initially
Iodine Solution (Lugol Iodine)
Glucocorticoids
Cooling Blanket
3 mins
Thyroid Storm Causes
Pathophysiology Causes
Sepsis
Thyroid Trauma
Surgery
Childbirth
Grave's Disease
Excessive Thyroid Hormone Ingestion
TSH-secreting Tumors
Hyperfunctioning Goiter or Nodule
McCune Albright Syndrome
2 mins
Hypothyroidism Assessment
Assessment
Weight Gain - Edema
Lethargy
Cold Intolerance
Bradycardia
Hypertension
Brittle Nails and Dry Skin
Constipation
Goiter
Prolonged Menses
Slowed Thinking
Diagnostic Tests
Decreased Free T4
Increased TSH
2 mins
Hashimoto's Thyroiditis
Symptoms
Hypothyroidism with Bouts of Hyperthyroidism
Enlarged, Nontender Thyroid
Mechanism
Autoimmune
Anti-Thyroid Peroxidase (TPO)
Anti-Thyroglobulin
Lab Findings
Hurthle Cells
Lymphoid Follicles
Associations
HLA-DR5 and HLA-DR3
Increased Risk Of Non-Hodgkin Lymphoma
2 mins
Papillary Thyroid Carcinoma
Characteristics
Most Common Thyroid Cancer
Excellent Prognosis
Lymphatic Spread
Diagnosis
Orphan Annie Nuclei
Empty Nuclei with Central Clearing
Psammoma Bodies
Risk Factors
Head and Neck Radiation
RET and BRAF Mutations
Gardner Syndrome
Cowden Syndrome
2 mins
Follicular Thyroid Carcinoma
Characteristics
Most Common to Present as Solitary Cold Nodule
Hematogenous Spread
Good Prognosis
Histological findings
Uniform Follicles
May Invade Capsule
Risk factors
Head and Neck Radiation
1 min
Medullary Thyroid Carcinoma
Sporadic and Familial Types
Arises from Parafollicular C cells
Produces Calcitonin
Hypocalcemia
May Produce ACTH
Diagnosis
Sheets of Cells With Amyloid Deposition
Increased Calcitonin with Pentagastrin Infusion
Risk Factors
MEN 2A and 2B
2 mins
Anaplastic Thyroid Cancer
Pathophysiology
Rapidly Progressive
Poor Prognosis
Hoarseness
Diagnosis
Invades Local Structures
Mixed Morphology
Risk Factors
Multinodular Goiter
Older Age
History of Thyroid Disease
2 mins
Parathyroid Gland
Characteristics
Blood Calcium Sensor
Parathyroid Hormone
Bone Resorption
Blood Calcium Increases
Vitamin D Activation
Calcium Absorption From The Small Intestine
1 min
Primary Hyperparathyroidism
Assessment
Hypercalcemia
Kidney Stones
Osteoporosis
Arrhythmias
Diagnostic Tests
Increased Calcium and Decreased Phosphorus
Considerations
Prevent Injury
Medication Education
Surgery
1 min
Vitamin D Deficiency
Signs & Symptoms
Rickets in children
Bending bones
Rachitic rosary
Breast milk has decreased vitamin D
Osteomalacia in adults
Tetany from Hypocalcemia
2 mins
Hypocalcemia
Muscle Spasms
Assessment
< 8.5 mg/dL Ca2+
Decreased Bone Density
Tetany
Chvostek's Sign
Trousseau's Sign
Increased DTR
ECG Changes
QT Prolongation
Considerations
Oral and IV Replacement of Ca2+
Seizure Precautions
2 mins
Hypercalcemia
Assessment
> 10.5 mg/dL Ca2+
Pathologic Fractures
Lethargy
Hypercoagulation
Constipation
ECG Changes
QT Shortening
Interventions
No Calcium Intake
Chelating Drugs
Calcitonin
Bisphosphonates
Loop Diuretics instead of Thiazide Diuretics
Considerations
Increased Risk for Renal Calculi
Increase Fluids
3 mins
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