hesi endocrine medsurg

Endocrine System Overview

Hyperthyroidism (Graves Disease, Goiter)

Description

Hyperthyroidism is defined as excessive activity of the thyroid gland, leading to an elevated level of circulating thyroid hormones, which may necessitate long-term or lifelong treatment.

Etiology

  1. Hyperthyroidism may result from:

    • A primary disease state, possibly from thyroid replacement hormone therapy.

    • Excess production of thyroid-stimulating hormone (TSH) due to an anterior pituitary tumor.

  2. Graves disease, considered an autoimmune process, accounts for most cases of hyperthyroidism.

Diagnosis

Diagnosis of hyperthyroidism is based on serum hormone levels, specifically:

  • Elevated T3 levels (greater than 220 ng/dL)

  • Elevated T4 levels (greater than 12 mcg/dL)

  • Low levels of TSH indicating primary disease; elevated T4 levels suppress Thyroid-Releasing Hormone (TRH) and subsequently TSH secretion. If the source is anterior pituitary, both TSH and T4 will be elevated.

  • Radioactive iodine uptake (I-131) tests indicate the presence of goiter, alongside thyroid scans.

Treatment

The common goals of treatment for hyperthyroidism include achieving a euthyroid state through:

  1. Thyroid Ablation: This can be achieved through medications like Propylthiouracil (PTU) and Methimazole, blocking T3 and T4 synthesis. Dosages are calculated based on body weight and are prescribed over several months. Treatment aims to prepare clients for thyroidectomy.

  2. Radioactive Iodine Therapy: Administering I-131 to destroy thyroid cells, though the treatment can irritate the GI tract and cause vomiting (the vomitus is radioactive).

  3. Thyroidectomy: Surgical removal of the thyroid gland, potentially requiring lifelong hormone replacement.

  4. Adenectomy: In cases where a TSH-producing tumor exists in the anterior pituitary.

Nursing Assessment

  1. Physical signs: An enlarged thyroid gland, acceleration of body processes (e.g., weight loss, increased appetite, diarrhea, heat intolerance), tachycardia, diaphoresis, exophthalmos (bulging eyes).

  2. Psychological signs: Nervousness and insomnia.

Nursing Plans and Interventions

  1. Calm Environment: Provide a restful atmosphere to minimize stress.

  2. Monitoring: Observe for signs of thyroid storm, a life-threatening condition characterized by abrupt over-secretion of thyroid hormones.

    • Symptoms include fever, tachycardia, agitation, anxiety, and hypertension.

  3. Medication Management: PTU and Methimazole are utilized to manage symptoms of thyroid storm. Propranolol may reduce sympathetic stimulation.

  4. Client Education:

    • Emphasize the importance of daily hormone replacement after treatment.

    • Advise wearing Medic Alert jewelry.

    • Discuss dietary needs, recommending a high-calorie, high-protein, low-caffeine, and low-fiber diet if diarrhea is present.

    • Eye care for exophthalmos: use artificial tears, sunglasses, and annual eye examinations.

Post-Treatment Considerations

  1. Thyroidectomy requires monitoring for:

    • Bleeding, irregular breathing, neck swelling, frequent swallowing, sensations of fullness at the incision site.

    • Laryngeal edema—check for voice changes.

    • Monitor Trousseau and Chvostek signs for potential tetany from parathyroid removal.

  2. Patients may require calcium gluconate for those with parathyroid gland injury.

Hypothyroidism (Hashimoto Disease, Myxedema)

Description

Hypothyroidism is characterized by the hypofunction of the thyroid gland, leading to an insufficiency of thyroid hormone production. Symptoms typically begin nonspecifically and progress over time.

Etiology

  • Endemic goiters can occur in areas with iodine deficiency; iodized salt helps combat this risk.

  • Myxedema coma, a severe form of hypothyroidism, may be precipitated by acute illness, withdrawal from thyroid medication, anesthesia, and sedatives.

Nursing Assessment

  1. Fatigue and lethargy

  2. Thin, dry hair and skin; brittle nails

  3. Constipation and decreased gastrointestinal motility

  4. Bradycardia and hypotension

  5. Cold intolerance and weight gain

  6. Goiter and periorbital edema

  7. Mental status changes: dull emotions and slow speech; low T3 (<70 ng/dL) and T4 (<5 mcg/dL) levels; presence of T4 antibodies indicates autoimmune destruction.

Nursing Plans and Interventions

  1. Medication Management: Daily doses of prescribed hormones with ongoing follow-up and adjustments based on serum levels.

  2. Bowel Management:

    • Instruct on high fluid intake (3 L/day).

    • Promote a high-fiber diet with physical activity to prevent constipation.

    • Minimize use