AH3

Exam Dates and Focus Areas - Exam 3: February 25, 2026 - Focus Areas: Endocrine, Hepatic, Cancer, Burns

Endocrine System Overview

Hypothalamus

  • Function: Maintains homeostasis and produces regulatory hormones, playing a critical role in temperature regulation, hunger, and sleep cycles.

  • Location: Beneath the thalamus, it connects the nervous system to the endocrine system via the pituitary gland.

Pancreas

  • Function: Involved in digestion through enzyme secretion and insulin production, which regulates glucose metabolism.

Pituitary Gland

  • Function: Controls vasopressin (ADH) production and stimulates other glands to release hormones.

  • Location: Base of the brain, often termed the "master gland" due to its regulatory role over other endocrine glands.

Gonads

  • Function: Reproductive glands that produce sex hormones (testosterone in males and estrogen and progesterone in females) and gametes (sperm and ova).

Thyroid Gland

  • Function: Regulates metabolism, influencing weight, energy levels, and overall growth. It produces thyroid hormones thyroxine (T4) and triiodothyronine (T3).

Parathyroid Gland

  • Function: Regulates calcium (Ca²⁺) and phosphorus levels, crucial for bone health and muscle function.

Adrenal Glands

  • Function: Produce cortisol and aldosterone, involved in stress response and blood pressure regulation, respectively.

  • Location: Top of the kidneys, they consist of two parts: the cortex and medulla, each releasing different hormones.

Gland Disorders

Hyperpituitarism

  • Definition: Pituitary adenoma, a benign (non-cancerous) tumor in the pituitary gland leading to hormonal imbalances.

  • Symptoms: Neurologic changes, excessive growth hormone (GH) production causing acromegaly, and no decrease in GH levels after suppression testing.

  • Conditions Associated: Acromegaly, characterized by enlarged skeletal thickness and organ size, hyperglycemia, and increased risk of diabetic complications.

Medical Management

  • Medications:

    • Parlodel (bromocriptine): Reduces headache and tumor size.

    • Dostinex (carbegoline): Manage gastrointestinal symptoms and help normalize hormone levels.

  • Surgical Management: Most common treatment for excess adrenocorticotropic hormone (ACTH) in Cushing's syndrome is surgical removal of the adenoma to relieve symptoms.

Cushing's Syndrome Management

  • Symptoms: Increased intracranial pressure (ICP), hypertension, and monitoring abnormal hormone levels (e.g., elevated prolactin).

  • Preoperative Care: Check and address CSF leak, provide neck packing during surgery, monitor for neuro changes, and manage hormone levels to stabilize the patient pre-surgery.

Antidiuretic Hormone (ADH)

Function and Feedback Mechanism

  • Negative Feedback: ADH signals kidneys to retain water and concentrate urine, playing a fundamental role in blood pressure regulation.

  • Positive Feedback: Increased body water absorption impacts renal tubules, leading to adjustments in thirst and urine concentration, vital for maintaining fluid balance in the body.

Diabetes Insipidus (DI)

  • Testing: 24-hour fluid intake and output measurement to assess kidney function and hormone levels.

  • Clinical Manifestations: Symptoms include hypernatremia and increased urination (4-30L/day), leading to severe dehydration if untreated.

  • Medications: Desmopressin acetate (DDAVP) is synthetic vasopressin, prescribed to manage symptoms.

Syndrome of Inappropriate Antidiuretic Hormone (SIADH)

  • Clinical Features: Fluid retention leading to weight gain, low urine output, and hypervolemia, complicating the clinical picture.

  • Symptoms: Confusion, lethargy, hypertension, bounding pulses, seizures, and respiratory symptoms due to fluid overload.

Diagnostic Measures

  • Treatment Options: Diuretics to promote fluid loss, fluid restrictions to prevent overload, and diligent monitoring for seizures and neurological status.

Parathyroid Gland Disorders

Parathyroid Hormone (PTH)

  • Function: Regulates calcium and phosphate balance, essential for maintaining healthy bones and neuromuscular function.

  • Clinical Manifestations of Disorders:

    • Hypoparathyroidism: Characterized by hypocalcemia and hyperphosphatemia.

    • Symptoms include muscle cramps, tetany, and neurological symptoms like seizures, which can lead to significant morbidity.

Treatment

  • Medication: Calcium chloride/gluconate infusion for hypocalcemia to stabilize physiological functions.

  • Long-term Management: Vitamin D supplementation and dietary considerations (emphasis on high calcium foods) are critical for maintaining calcium levels.

Adrenal Gland Disorders

Cushing's Disease

  • Symptoms: Moon face, obesity, skin changes such as bruising and thinning, changes in body hair distribution, and systemic effects like hypertension and diabetes.

  • Diagnosis: Testing for cortisol levels, both in urine and blood, is essential to confirm diagnosis.

Treatment

  • Medication: Cortisol inhibitors are used, and surgical interventions like adrenalectomy for tumor removal are performed as necessary to restore hormonal balance.

Addison's Disease

  • Primary: Failure of adrenal glands to produce sufficient hormones, leading to significant hormonal imbalance.

  • Symptoms: Fatigue, weight loss, muscle weakness, hypotension, and decreased ability to respond to stress, potentially life-threatening in acute situations.

Diagnostic Testing

  • ACTH Stimulation Test: Checks cortisol levels post-ACTH injection to assess adrenal response.

  • Medication Management: Lifelong hormone replacement therapy (hydrocortisone) is necessary to manage adrenal insufficiency successfully.

Hepatic Disorders

Acute Liver Failure

  • Causes: Viral hepatitis, drug toxicity, and hepatic encephalopathy leading to metabolic and systemic disturbances.

  • Clinical Features: Mental confusion, coagulopathy, ascites, edema, and asterixis which point to impaired liver function and need for intervention.

Diagnosis and Management

  • Laboratory Tests: Serum ammonia levels and liver function tests (LFTs) are critical markers that guide management decisions.

  • Management Strategy: Referrals for transplant evaluation, nutritional supports tailored to liver health, and monitoring for complications are essential.

Cancer Treatment and Complications

Chemotherapy

  • Effects: Causes myelosuppression, resulting in neutropenia, anemia, and thrombocytopenia, affecting the body's ability to fight infections.

  • Precautions: Infection precautions must be taken, especially during neutropenia where patients are at heightened risk for infections.

Radiation Therapy

  • Mechanism: High-energy particles damaging DNA in rapidly dividing cancer cells, which is key in controlling tumor growth.

  • Side Effects: Include skin reactions and systemic side effects due to the damage to surrounding tissues, impacting patient quality of life.

Surgical Management in Oncology

  • Post-Operative Care: Monitoring for infection, managing pain effectively, and facilitating recovery through rehabilitation support are vital for successful outcomes.

  • Types of Surgeries: Resections, biopsies, and palliative surgeries are performed depending on cancer staging and patient needs.

Specific Cancer Types
Lung Cancer

  • Paths of Management: Resection, chemotherapy, and radiation therapy for palliative care to manage symptoms and improve quality of life.

Breast Cancer

  • Genetic Factors: BRCA1/2 gene mutations significantly increase risk.

  • Treatment Options: Lumpectomy, mastectomy, hormonal therapy, and radiation are options based on staging and patient preference.

Burns

Types of Burns

  • Thermal Burns: Caused by contact with flames, hot liquids, or steam; requires immediate cooling and assessment for severity.

  • Chemical Burns: Resulting from exposure to acids or alkalis; the severity is determined by chemical properties and duration of contact, necessitating decontamination and treatment.

  • Electrical Burns: Often result in severe internal damage despite minimal external injuries; requires thorough internal assessment and monitoring.

Burn Management
Assessment and Interventions

  • Fluid Resuscitation: Based on Parkland formula calculations to prevent hypovolemic shock and stabilize hemodynamics.

  • Infection Control: Important to monitor for signs of infection in burn wounds; education on wound care is crucial to recovery.

Conclusion

  • Understanding the endocrine system, hepatic disorders, and treatment modalities for cancers and burns is essential for effective nursing interventions and patient management, improving outcomes and quality of care.