endocrine

Iodine and Dietary Considerations

  • Ensure patients are not using excessive iodinated salt.
  • Common sources of iodine:
    • Seaweed
    • Other iodinated foods.
  • Caution against using iodine solutions for disinfection.

Growth Hormone (GH)

Role of Growth Hormone

  • GH is essential for pediatric growth.
    • Helps children develop properly up to puberty.
    • Adequate muscle mass is crucial for development.
  • In adults, GH impacts muscle mass and health.
    • Epiphyseal plates close post-puberty, preventing bone lengthening.

Therapeutic Use of Growth Hormone

  • Somatropin is administered to pediatric patients lacking sufficient GH.
  • In adults, provided in conditions like:
    • Cachexia due to cancer.
    • HIV/AIDS-related muscle loss.
  • Risks associated with growth hormone replacement:
    • Hyperglycemia: GH can decrease insulin’s effectiveness.
    • Possible antibody formation against exogenous GH, reducing efficacy.

Side Effects of Growth Hormone

  • Orthopnea risk in obese patients or those with sleep apnea (caution advised).
  • Can lead to complications if given post-epiphyseal closure in children (after puberty).

Conditions of Excess Growth Hormone

Gigantism and Acromegaly

  • Gigantism: Excess GH before epiphyseal closure; results in excessive height.
  • Acromegaly: Excess GH in adults; results in enlarged facial features and hands.
  • Treatment approaches:
    • Octreotide and lanreotide: Suppress pituitary GH release.
    • Pegvisomant: Antagonizes GH receptors to reduce responsiveness.

Risks of GH Antagonists

  • GI disturbances (cramping, diarrhea): Needs differential from gallstones.
  • Monitor for glucose dysregulation (hyper/hypoglycemia).
    • These drugs can lead to liver injury; thus, monitoring liver function tests (LFTs) is essential.
    • Various drug interactions including weak efficacy of antiarrhythmics.

Antidiuretic Hormone (ADH) and Diabetes Insipidus

Diabetes Insipidus

  • Characterized by a deficiency of ADH leading to excessive dilute urine production.
    • Sodium concentration elevates, leading to potential hypernatremia.
  • Symptoms include thirst and dehydration risk.

Treatment Options

  • Vasopressin and desmopressin: Synthetic ADH for treatment.
    • Noted for their vasoconstrictive properties, especially in shock situations.
    • Risk of hyponatremia and SIADH (excess ADH), monitor for headache and drowsiness.

Adrenal Disorders

Adrenal Insufficiency (Addison’s Disease)

  • Symptoms include fatigue, hypoglycemia, low blood pressure, and hyperpigmentation.
  • Treatment with:
    • Hydrocortisone (or other corticosteroids)
    • Fludrocortisone (Mineralocorticoid mimicking aldosterone).

Adverse Effects of Corticosteroids

  • Cushingoid features: moon facies, buffalo hump, hypertension, and diabetes risks.
  • Caution with immunosuppression: An active infection should lead to avoiding steroids.
  • Monitoring for diabetes, osteoporosis, and potassium levels when administering steroid therapy.

Stress Management in Adrenal Insufficiency

  • Importance of dosing adjustments during stress (e.g., hospitalization).
    • Patients on steroids may need increased dosages to match physiological needs.
    • Lifelong therapy generally required for adrenal insufficiency management.

Conclusion

  • Interconnections in endocrine disorders and their treatments highlight the need for careful monitoring of hormone levels and physiological responses.
  • Clearly documented contraindications and risk factors are essential during therapy to avoid adverse effects and complications.