Nephrology Disorders Overview

Nephrosclerosis

• Definition: Nephrosclerosis is characterized by the hardening of the renal arteries, similar to arteriosclerosis.
• Pathophysiology:
  • Hardening of renal arteries leads to decreased blood flow to the kidneys.
  • Resulting in kidney hypoxia, which means that the kidneys do not receive sufficient oxygen.
• Causes:
  • Major contributing factors include hypertension and diabetes.
• Signs and Symptoms:
  • Early signs and symptoms are rare and usually present only in the advanced stages of the condition.
  • Possible manifestations include:
  • Proteinuria: Presence of proteins secreted by damaged kidney tubules.
• Treatment Goals:
  • Focus on prevention.
  • Strategies include:
  • Controlling hypertension.
  • Managing blood sugar levels (for diabetic patients).
  • Dietary interventions:
    • Low sodium diet.
    • Low fat diet.
    • Low cholesterol diet.

Pyelonephritis

• Definition: Pyelonephritis is a bacterial infection in the upper urinary tract that affects the kidneys.
• Mechanism of Infection:
  • Bacteria may reach the kidneys either from the bladder or through the bloodstream.
• Risk Factors and Causes:
  • Possible causes include obstructions such as:
  • Kidney stones.
  • Strictures.
  • Benign Prostatic Hyperplasia (BPH).
  • Tumors.
• Signs and Symptoms:
  • Specific to acute pyelonephritis may include:
  • Signs of infection:
    • Chills.
    • Fever.
    • Leukocytosis (increased white blood cell count).
  • Urinary symptoms:
    • Increased frequency of urination.
    • Urgent need to urinate.
  • General symptoms:
    • Fatigue.
    • Headache.
    • Poor appetite.
    • Polyuria (excessive urination).
    • Thirst (excessive thirst).
    • Weight loss.
• Complications:
  • Recurrent infections may lead to kidney scarring and end-stage renal disease.
• Treatment for Acute Pyelonephritis:
  • Fluid Management: Increase fluid intake to help flush the kidneys.
  • Diagnostic Imaging: Ultrasound to identify obstructions.
  • Urine Culture and Sensitivity: To identify the bacteria causing infection.
  • Antibiotic Treatment: Typically prescribed for two weeks, may extend to six weeks if relapse occurs.
• Treatment for Chronic Pyelonephritis:
  • Long-term prophylactic measures:
  • Encourage fluid intake unless contraindicated.
  • Administer antipyretics and antimicrobial agents.
  • Educate patients on maintaining good bladder hygiene.

Glomerulonephritis

• Definition: Glomerulonephritis is the inflammation of the glomerular capillaries.
• Types:
  • Acute Glomerulonephritis: Often related to nephrotic syndrome.
  • Chronic Glomerulonephritis: Results from multiple acute episodes leading to hypertension, hyperlipidemia, or sclerosis.
• Signs and Symptoms:
  • Early signs may be asymptomatic until hypertension or increased blood urea nitrogen (BUN) and creatinine levels occur.
  • General symptoms may include:
  • Weight loss.
  • Loss of muscle strength.
  • Increased irritability.
  • Nocturia (increased urination at night).
  • Late signs:
  • Poor nourishment appearance.
  • Yellow-gray skin pigmentation.
  • Periorbital and peripheral edema.
  • Anemia with pale mucous membranes.
  • Congestive Heart Failure (CHF) signs:
    • Jugular Venous Distension (JVD).
    • Cardiomegaly.
    • Gallop rhythm.
    • Crackles in the lungs.
  • Chronic glomerulonephritis can progress to kidney failure.
• Diagnosis:
  • Laboratory tests may show:
  • Fixed specific gravity.
  • Variable protein levels in urine and urinary casts.
• Treatment:
  • Control hypertension.
  • Manage fluid volume.
  • Daily weight monitoring.
  • Use diuretics as necessary.

Acute Nephritic Syndrome

• Pathophysiology:
  • Usually follows an acute viral infection, resulting in enlargement of the kidneys.
  • Involves antigen-antibody complexes forming in response to infections or viruses, causing inflammation of the capillary beds.
• Laboratory Findings:
  • Typical observations include:
  • Rising creatinine levels.
  • Hypertension.
  • Evidence of leaky capillary beds:
    • Hematuria (the presence of blood in urine).
    • Proteinuria (the presence of protein in urine).
  • Cola-colored urine is a hallmark sign, indicative of RBCs and protein plugs.
• Specific Considerations for Elderly Patients:
  • May present with confusion as a sign or symptom due to renal impairment.
• Treatment:
  • Dietary restrictions:
  • Limit dietary protein, especially in cases of renal insufficiency.
  • Sodium management is crucial, particularly for those showing signs of heart failure.
  • If involved, treat streptococcal infections with Penicillin, corticosteroids may be used as well.
  • Carbohydrates should be given liberally to provide energy and reduce protein catabolism.
  • Monitor strict input and output (I&O).

Nephrotic Syndrome

• Definition: Characterized by increased capillary permeability of the glomerulus, allowing for protein leakage.
• Signs and Symptoms:
  • Edema: Notable deep-seated edema in hands and feet; may present as pitting edema.
  • Periorbital Edema: Swelling around the eyes.
  • Possible hypotension due to low protein levels.
• Laboratory Findings:
  • Urine may show massive protein levels (not normally present) indicating nephrotic syndrome.
  • Albumin levels (albutamolium) may be low due to increased loss through urine.
• Pathophysiology:
  • The liver's ability to produce albumin cannot keep up with losses from the kidneys.
• Treatment:
  • Manage signs and symptoms, focusing on the underlying cause.
  • Aim to prevent progression to chronic kidney disease (CKD) or at least slow its advancement.
  • Hypertension