Chronic Renal Failure (CRF) Pathophysiology
Chronic Renal Failure (CRF) Pathophysiology
The Complex Pathway from Impaired Renal Function to Systemic Complications
Step 1: Normal Renal Function / Nephron Injury
Core Issue: Glomerular Filtration Rate (GFR) Decline
Path A: Retention and Hypertension
Loss of Renal Excretory Function
Retained Substances
- Salt, Water, Medium Molecules $\rightarrow$ **Hypertension**, **Pruritus**
- Uremic Toxins, Urea $\rightarrow$ **Electrolyte Imbalance**, **Renal Osteodystrophy**
- Creatinine, Phosphate $\rightarrow$ **Acidosis**, **Hyperphosphatemia**, **Neuropathy**, **GI Disorders**
- Uric Acid $\rightarrow$ **Hyperuricemia**, **Coagulation Dysfunction**
Outcome: Systemic Edema, Hypertensive Crisis
Path B: Endocrine Deficiency
Impaired Renal Hormone Production
Deficient Products
- **Erythropoietin (EPO)** Decrease $\rightarrow$ **Renal Anemia**
- **Active Vitamin $\text{D}_3$ (Calcitriol)** Decrease $\rightarrow$ Reduced Intestinal Calcium Absorption
Chain Reaction
- Blood $\text{Ca}^{2+}$ Decrease, Stimulating **Parathyroid Hormone (PTH)** Increase
- Increased PTH causes bone calcium release $\rightarrow$ **Bone Demineralization**
Outcome: Severe Anemia, Renal Bone Disease
Path C: Metabolic and Acid-Base Imbalance
Loss of Homeostatic Regulation
Key Changes
- **Ammonia $\text{(NH}_3)$ Production** Anomaly
- Abnormal **Free Fatty Acid** breakdown $\rightarrow$ **Hyperlipidemia**
- **Hormone Inactivation** due to GFR decline.
- **$\text{H}^{+}$ Retention** $\rightarrow$ **Severe Acidosis**
Associated Effects
- Autonomic Dysfunction (Sympathetic Nervous System Disorder)
Outcome: Systemic Metabolic Disorder
Step 4: Uremia and Systemic Complications
End-stage Manifestation of Multi-system Failure
Neuropathy
Gastrointestinal Disorders
Bone Demineralization
Coagulation Dysfunction
Decreased Immune Function (Infection Risk)
Increased Cardiovascular Risk $\uparrow$
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