Urologic Problems

Urologic Problems Study Notes

Material Covered

  • Focus: Obstructive Urologic Disorders

Terminology

  • Nephro: Refers to 'kidney'.

Key Terms Related to Urology

  • Hematuria: Presence of blood in urine.

  • Azotemia: Elevated nitrogen levels in the blood, indicating kidney issues.

  • Oliguria: Urine production of less than 0.5 ml/kg/hr, indicating poor kidney function.

  • Proteinuria: Elevated protein levels in urine; a sign of kidney injury.

  • Glomerular Filtration Rate (GFR): A measurement of kidney function, reflecting how well your kidneys filter blood.

Obstructive Urologic Disorders

  • Key factors to evaluate when an obstruction is present:
      - Degree: The severity of the obstruction.
      - Location: Where the obstruction occurs within the urinary tract.
      - Duration: How long the obstruction has been present.
      - Timing: Timing in relation to other events or conditions.

Common Locations of Obstruction

  1. Renal Pelvis: Obstruction may occur due to:
       - Renal calculi (kidney stones)
       - Trauma

  2. Ureter: Possible reasons for obstruction include:
       - Renal calculi
       - Pregnancy
       - Tumors
       - Trauma

  3. Bladder and Urethra: Conditions leading to obstruction:
       - Bladder cancer
       - Neurogenic bladder
       - Prostatic hyperplasia
       - Prostate cancer
       - Urethral strictures
       - Trauma

Consequences of Obstruction

  • Urine Stasis: Urine flow is halted.

  • Back-up Pressure: Increased pressure in the urinary tract can cause damage.

  • Hydroureter: Swelling of the ureters due to accumulation of urine.

  • Hydronephrosis: Swelling of the kidney due to urine back-up.

  • Post-renal Kidney Failure: Kidney failure resulting from obstruction.

Nephrolithiasis (Kidney Stones)

  • Risk Factors: Considerations for nephrolithiasis include:
      - Sex: Higher prevalence in men.

Etiology

  • Cause: Kidney stones develop from crystallized solutes in urine.

Pathogenesis

  • Urine is comprised of solvent (primarily water) and various solutes (dissolved particles) leading to stone formation.

Types of Kidney Stones

  1. Calcium Stones

  2. Cystine Stones

  3. Uric Acid Stones

  4. Struvite Stones

Clinical Manifestations

  • Acute Renal Colic: Characterized by severe pain, often the presenting symptom in emergency settings.
      - Pain Location: Varies depending on the stone's location.

Pharmacology for Nephrolithiasis

  • Acute Pain Management:
      - IV Narcotics such as Morphine or Hydromorphone.
      - NSAIDs: Non-steroidal anti-inflammatory drugs.
      - IV fluids for hydration.

  • Preventive Medications:
      - Calcium Stones: Treated with thiazide diuretics.
      - Struvite Stones: Managed with antibiotics.
      - Urate Stones: Treated with allopurinol (also used in gout treatment).

Urinary Tract Infections (UTIs)

  • Risk Factors:
      - Catheterization associated infections (CAUTI).

Pathogenesis of UTIs

  • Ascending Pattern: Bacterial infection ascends from the contaminated perineum to the urethra, then to the bladder (cystitis), and potentially to the ureters and kidney (pyelonephritis).

Lower UTI Clinical Manifestations

  • Urethritis:
      - Dysuria: Painful urination.
      - Symptoms: Most notably asymptomatic presentations.

  • Cystitis:
      - Symptoms include:
        - Increased frequency of urination.
        - Urgency to urinate.
        - Suprapubic discomfort.
        - Dysuria.
        - Possible hematuria.

Upper UTI Clinical Manifestations

  • Symptoms:
      - Sudden onset of fever and chills.
      - Costovertebral angle (CVA) tenderness.
      - Accompanied by lower UTI symptoms and additional symptoms such as nausea/vomiting and anorexia.

Complications of UTIs

  • Sepsis:
      - Definition: A severe systemic response to a UTI that can be life-threatening.
      - High-Risk Groups:
        - Elderly patients.
        - Diabetics.
        - Immunosuppressed individuals.
      - Prognosis: High mortality risk without prompt treatment.
      - Treatment: Focus on source control, use of antibiotics, monitoring cultures, and supportive care.

Atypical UTI Presentations

  • In Children:
      - Symptoms may include fever, diarrhea, vomiting, irritability, and poor feeding.

  • In Elderly Patients:
      - Symptoms may manifest as anxiety, confusion, lethargy, and anorexia, with a history of falls possibly aggravated by UTI symptoms.

Treatment Regimens for UTI

  • Antibiotics for community-acquired infections may include:
      - Single-dose therapy.
      - Short-course therapy (typically 3 days).
      - Conventional therapy (7-14 days).

  • Treatment considerations vary depending on:
      - Location of UTI (upper vs lower).
      - Presence of complications or pregnancy.
      - Culture and sensitivity results from laboratory tests.

Specific Antibiotic - Bactrim (Septra) Information

  • Classification: Also known as Sulfatrim, this is a sulfa drug.
      - Mechanism of Action: Works by inhibiting the synthesis of folate in bacteria, thus halting DNA and protein synthesis.
      - Metabolism: Metabolized by the liver (CYP450 system); primarily excreted in urine.
      - Indications: Used to treat uncomplicated UTIs and offers coverage for MRSA.
      - Side Effects: May include nausea/vomiting and increased sensitivity to sunlight (sunburn).
      - Pregnancy: Generally considered safe after the first trimester.