NU551 Seminar 8 Lecture Notes on Urological Conditions and Hormonal

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Purdue University Globle 

NU551 Advanced Physiology and Pathophysiology Across the Lifespan

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Urinary and Reproductive System Disorders:

The urinary and reproductive systems regulate fluid balance, waste removal, hormone production, blood pressure, and reproductive health. Understanding common disorders such as cryptorchidism, amenorrhea, urinary tract infections (UTIs), nephrolithiasis, benign prostatic hyperplasia (BPH), and electrolyte imbalances helps healthcare professionals recognize symptoms early, provide appropriate patient education, and improve clinical outcomes. This guide summarizes the most important concepts for nursing students and healthcare professionals in an easy-to-understand format.

Testicular Disorders

Cryptorchidism (Undescended Testes)

Cryptorchidism is a condition in which one or both testes fail to descend from the abdomen into the scrotum before birth. It is one of the most common congenital abnormalities affecting male infants.

If left untreated, cryptorchidism may increase the risk of:

• Infertility

• Testicular cancer

• Testicular torsion

• Inguinal hernia

Early diagnosis and surgical correction (orchiopexy), typically before 18 months of age, significantly improve long-term outcomes.

Menstrual Disorders

Amenorrhea

Amenorrhea refers to the absence of menstrual periods. It can be either primary (menstruation never begins) or secondary (menstrual cycles stop after previously occurring).

Common causes include:

• Pregnancy

• Menopause

• Chronic stress

• Eating disorders such as anorexia nervosa

• Hormonal contraceptives

• Nutritional deficiencies

• Endocrine disorders

Treatment depends on identifying and addressing the underlying cause.

Dysmenorrhea

Dysmenorrhea is characterized by severe, painful menstrual cramps that interfere with daily activities.

Common contributing factors include:

• Hormonal imbalances

• Polycystic ovary syndrome (PCOS)

• Uterine fibroids

• Endometriosis

Management may include NSAIDs, hormonal therapy, lifestyle modifications, and treatment of the underlying condition.

Polycystic Ovary Syndrome (PCOS)

PCOS is a hormonal disorder that affects ovulation and reproductive health.

Common complications include:

• Infertility

• Irregular menstrual cycles

• Weight gain

• Insulin resistance

• Increased risk of cardiovascular disease

• Type 2 diabetes

Early diagnosis and lifestyle modifications can reduce long-term complications.

Kidney Function and Blood Pressure Regulation

The kidneys are essential for maintaining blood pressure through the renin-angiotensin-aldosterone system (RAAS).

Renin

Renin is an enzyme secreted by the kidneys when blood pressure decreases.

Its primary function is to initiate the RAAS pathway, ultimately leading to:

• Vasoconstriction

• Sodium retention

• Water retention

• Increased blood pressure

Angiotensin II

Angiotensin II is one of the body’s most powerful vasoconstrictors.

Its actions include:

• Constricting blood vessels

• Stimulating aldosterone secretion

• Increasing sodium and water reabsorption

• Raising systemic blood pressure

Antidiuretic Hormone (ADH)

ADH promotes water reabsorption in the kidneys.

As more water is retained:

• Blood volume increases.

• Blood pressure rises.

Kidney Filtration

Healthy kidneys receive approximately 20–25% of cardiac output and filter approximately 1,100–1,200 mL of blood per minute.

This filtration process occurs through three major mechanisms:

Ultrafiltration

Blood plasma is filtered through the glomerulus into Bowman’s capsule while retaining blood cells and large proteins.

Tubular Reabsorption

Useful substances are returned to the bloodstream, including:

• Water

• Glucose

• Sodium

• Amino acids

Tubular Secretion

Waste products and excess ions are actively secreted into the renal tubules for elimination.

Examples include:

• Hydrogen ions

• Potassium

• Certain medications

Cells of the Collecting Duct

Principal Cells

Principal cells are the most abundant cells within the collecting duct.

Their functions include:

• Sodium reabsorption

• Potassium secretion

• Water regulation under the influence of ADH

Intercalated Cells

Intercalated cells primarily regulate acid-base balance by controlling hydrogen and bicarbonate ion secretion.

Urinary Tract Infections (UTIs)

Urinary tract infections may affect either the lower or upper urinary tract.

Cystitis

Cystitis is an infection of the bladder.

The most common causative organism is Escherichia coli (E. coli).

Common symptoms include:

• Burning during urination

• Urinary urgency

• Frequency

• Suprapubic discomfort

• Cloudy urine

Pyelonephritis

Pyelonephritis is a bacterial infection involving the kidneys.

Typical findings include:

• Fever

• Chills

• Flank pain

• Costovertebral angle tenderness (CVA tenderness)

• Nausea and vomiting

In children, pyelonephritis may also lead to kidney enlargement.

Prompt antibiotic treatment is essential to prevent permanent renal damage.

Nephrolithiasis (Kidney Stones)

Nephrolithiasis refers to the formation of kidney stones within the urinary tract.

Treatment depends on several factors, including:

• Stone size

• Stone location

• Degree of urinary obstruction

• Duration of obstruction

Common Types of Kidney Stones

Patient Education

Patients should be encouraged to:

• Maintain adequate hydration.

• Reduce sodium intake.

• Limit foods high in oxalates or purines when appropriate.

• Follow dietary recommendations based on stone composition.

• Complete prescribed follow-up imaging if recommended.

Renal Cell Carcinoma

Renal cell carcinoma is the most common type of kidney cancer in adults.

Chief Clinical Sign

The classic presenting symptom is:

Hematuria (blood in the urine).

Additional symptoms may include:

• Flank pain

• Palpable abdominal mass

• Unexplained weight loss

• Fatigue

Benign Prostatic Hyperplasia (BPH)

BPH is a noncancerous enlargement of the prostate gland that commonly occurs with aging.

Common Symptoms

• Difficulty initiating urination

• Urinary hesitancy

• Weak urinary stream

• Increased urinary frequency

• Urinary urgency

• Nocturia

• Overflow urinary incontinence

Bladder Anatomy

Trigone

The trigone is the triangular region located between the openings of the two ureters and the urethra.

This area:

• Is highly sensitive to bladder filling.

• Plays an important role in normal urinary function.

• Works together with the detrusor muscle during bladder emptying.

Spinal Cord Injury and Bladder Dysfunction

Individuals with spinal cord injuries involving S2–S4 may experience neurogenic bladder dysfunction.

Common manifestations include:

• Urinary retention

• Urinary incontinence

• Bladder spasms

• Impaired bladder sensation

Henoch-Schönlein Purpura (IgA Vasculitis)

Henoch-Schönlein purpura is an immune-mediated small-vessel vasculitis commonly affecting children.

Classic clinical features include:

• Purplish skin rash (palpable purpura)

• Joint pain

• Abdominal pain

• Kidney dysfunction

Renal involvement should be monitored carefully because it can progress to chronic kidney disease.

Electrolyte and Acid-Base Balance

Hypernatremia

Hypernatremia occurs when serum sodium exceeds 145 mEq/L.

A sodium level of 155 mEq/L indicates significant hypernatremia.

Normal Sodium Range

135–145 mEq/L

Symptoms may include:

• Thirst

• Confusion

• Muscle twitching

• Seizures

• Altered mental status

Potassium

Potassium is essential for normal muscle and cardiac function.

Normal Range

3.5–5.0 mEq/L

Abnormal potassium levels can cause:

• Cardiac arrhythmias

• Muscle weakness

• Neuromuscular dysfunction

Arterial Blood Gas (ABG) Reference Values

These values are used to assess acid-base disorders, respiratory function, and metabolic status.

Peyronie’s Disease

Peyronie’s disease is characterized by fibrous scar tissue formation within the penis, causing:

• Penile curvature

• Pain during erection

• Erectile dysfunction

• Difficulty with sexual intercourse

Treatment options vary depending on severity and may include medication, traction therapy, or surgery.

Key Clinical Facts for Quick Review

• Cryptorchidism increases the risk of infertility and testicular cancer if untreated.

• Amenorrhea may result from pregnancy, menopause, stress, nutritional deficiencies, or endocrine disorders.

• Renin, angiotensin II, and ADH all contribute to increasing blood pressure.

• E. coli is the leading cause of uncomplicated cystitis.

• Costovertebral angle tenderness strongly suggests pyelonephritis.

• Hematuria is the hallmark sign of renal cell carcinoma.

• Hypernatremia is defined as a sodium concentration greater than 145 mEq/L.

• Normal potassium levels range from 3.5–5.0 mEq/L.

• The kidneys filter approximately 1,100–1,200 mL of blood each minute.

• Principal cells regulate sodium and water balance, while intercalated cells help maintain acid-base balance.

Frequently Asked Questions

What is the most common cause of cystitis?

Escherichia coli (E. coli) is responsible for approximately 75–95% of uncomplicated bladder infections.

Which hormone directly increases blood pressure?

Several hormones increase blood pressure, including renin, angiotensin II, aldosterone, and antidiuretic hormone (ADH) through vasoconstriction and fluid retention.

What is the hallmark symptom of renal cell carcinoma?

The classic hallmark sign is hematuria, although flank pain and an abdominal mass may also occur.

What is the normal sodium level?

The normal serum sodium concentration ranges from 135–145 mEq/L.

What are the major types of kidney stones?

The primary kidney stone types include:

• Calcium stones

• Cystine stones

• Struvite stones

• Uric acid stones

What is costovertebral angle tenderness associated with?

Costovertebral angle tenderness is strongly associated with pyelonephritis, a bacterial kidney infection.

Healthy kidneys maintain fluid balance, regulate electrolytes, filter waste, and control blood pressure through hormones such as renin and ADH. Common urinary disorders—including cystitis, pyelonephritis, nephrolithiasis, BPH, and renal cell carcinoma—can often be distinguished by their characteristic symptoms, such as dysuria, flank pain, hematuria, urinary obstruction, or costovertebral angle tenderness. Early recognition, accurate diagnosis, and evidence-based management are essential for preventing complications and improving patient outcomes.

References

American Diabetes Association. (2025). Standards of care in diabetes—2025. https://diabetesjournals.org/care

Hall, J. E., & Hall, M. E. (2021). Guyton and Hall textbook of medical physiology (14th ed.). Elsevier. https://www.elsevier.com/books/guyton-and-hall-textbook-of-medical-physiology/hall/978-0-323-59712-8

Hinkle, J. L., & Cheever, K. H. (2022). Brunner & Suddarth’s textbook of medical-surgical nursing (15th ed.). Wolters Kluwer. https://shop.lww.com/Brunner—Suddarth-s-Textbook-of-Medical-Surgical-Nursing/p/9781975161038

McCance, K. L., & Huether, S. E. (2023). Pathophysiology: The biologic basis for disease in adults and children (9th ed.). Elsevier. https://www.elsevier.com/books/pathophysiology-the-biologic-basis-for-disease-in-adults-and-children/mccance/9780323789870

NU551 Seminar 8 Lecture Notes on Urological Conditions and Hormonal

National Institute of Diabetes and Digestive and Kidney Diseases. (2024). Kidney stones. https://www.niddk.nih.gov/health-information/urologic-diseases/kidney-stones

National Kidney Foundation. (2024). Kidney disease information. https://www.kidney.org/

Urology Care Foundation. (2024). Benign prostatic hyperplasia (BPH). https://www.urologyhealth.org/urology-a-z/b/benign-prostatic-hyperplasia-(bph)

World Health Organization. (2024). Sexual and reproductive health. https://www.who.int/health-topics/sexual-health