Renal and Urological

Section 5: Medical Overview

• Title: Renal and Urologic Emergencies

• Source: Jones & Bartlett Learning, 2016

Introduction to the Urinary System

• Functions:

  • Regulates electrolytes, water content, and blood pH.

  • Removes metabolic wastes, drug metabolites, and excess fluids.

• Kidney Function:

  • Filters approximately 200 liters of blood daily.

Renal Disorders

• Prevalence:

  • Average of 15 Canadians diagnosed with kidney failure daily.

  • 7% annual increase in kidney disease diagnoses.

  • 43,200 Canadians treated for kidney failure currently.

  • Estimated doubling of kidney disease cases in 10 years.

• Economic Impact:

  • Estimated cost of $2.6 billion annually for kidney disease care.

• Associated Risks:

  • Increased cardiovascular disease, hypertension, and other chronic diseases.

Anatomy and Physiology of the Kidneys

• Kidney Structure:

  • Bean-shaped organs located in the retroperitoneal space.

  • Responsible for blood filtration and urine production.

• Supporting Structures:

  • Urinary Bladder: Stores urine.

  • Ureters: Transport urine from kidneys to bladder.

  • Urethra: Exits urine from the bladder.

  • Renal Fascia: Anchors the kidney to the abdominal wall.

Internal Anatomy of the Kidney

• Main Structures:

  • Cortex, Medulla, Renal Pelvis, Calyces.

• Blood Flow:

  • One-fourth of the body's cardiac output flows through the kidneys each minute.

Nephrons

• Function:

  • Structural and functional units of kidneys (1.25 million per kidney).

  • Key components:

    • Glomerulus: Filters blood.

    • Glomerular Capsule: Double-layered cup involved in filtration.

    • Proximal Convoluted Tubule (PCT), Loop of Henle, Distal Convoluted Tubule (DCT).

Micturition Reflex

• Mechanism:

  • Stretch receptors in the bladder wall send nerve signals for contraction.

• Urine Output Norms:

  • Normal: 1.5-2 mL/kg/hr; needs rapid assessment in shock situations.

Urinary Tract Infections (UTI)

• Prevalence:

  • Most common in lower urinary tract (urethra and bladder).

  • More frequent in women due to anatomical differences.

• Cystitis Symptoms:

  • Painful urination, frequent urges, difficulty urinating, and potential foul-smelling cloudy urine.

Kidney Stones

• Origin:

  • Formed in the renal pelvis due to crystallization of salts or uric acid.

• Types:

  • Calcium, Struvite, Uric acid, and Cystine stones.

• Symptoms:

  • Severe pain (rated as 11/10), often starting vague then intensifying.

Acute Renal Failure

• Definition:

  • Sudden decline in kidney function leading to toxin accumulation in the blood.

• Mortality Rate:

  • 50% to 60% with potential for reversibility.

• Key Types:

  • Prerenal (hypoperfusion), Intrarenal, and Postrenal causes.

Chronic Renal Failure

• Progression:

  • Progressive loss of nephrons leading to permanent kidney damage.

• Consequences:

  • Uremia, azotemia, and symptoms including lethargy, nausea, and changes in consciousness.

Renal Dialysis

• Types:

  • Peritoneal Dialysis and Hemodialysis.

• Complications:

  • Hypotension, electrolyte imbalances, and potential air embolism.

Management of Renal Emergencies

• Key Considerations:

  • Immediate care focused on ABCs; monitor for complications.

• UTI Management:

  • Provide comfort, establish IV, and transport for evaluation.

• Kidney Stones Management:

  • Pain relief and IV fluid administration.

Assessment Techniques

• Focused History:

  • Important to document pain, assess vital signs, monitor for electrolyte imbalances.

• Ongoing Assessment:

  • Essential for identifying changes in patient status.

Summary of Key Points

• Anatomy & Physiology: Understanding the structure and function of kidneys.

• Pathophysiology: Recognizing the underlying causes of renal and urologic emergencies.

• Assessment and Management: Implementing effective evaluations and treatments for patients suffering from renal disorders.