A dialyzer (commonly known as an "artificial kidney") is the core component in hemodialysis treatment, consisting primarily of a supporting structure and a semipermeable membrane.
I. Primary Functions
• Removal of metabolic waste: Eliminates nitrogenous metabolic wastes—such as urea and creatinine—from the blood via diffusion.
• Removal of excess fluid: Uses ultrafiltration (driven by a transmembrane pressure gradient) to remove fluid accumulated in the body.
• Regulation of electrolytes and acid-base balance: Corrects electrolyte imbalances—such as hyperkalemia and metabolic acidosis—through the exchange of solutes with the dialysate.
II. Clinical Applications
• Acute Kidney Injury (AKI): Used in the emergency management of acute renal failure, severe hyperkalemia, and drug or toxin poisoning.
• End-Stage Renal Disease (ESRD/Uremia): Provides regular hemodialysis treatment for patients with chronic renal failure (typically three times per week, for 3–5 hours per session).
• Management of specific complications: Such as severe fluid overload, congestive heart failure, and uremic pericarditis.
III. Usage and Care Considerations
• Strict patient-specific use: If a dialyzer is reused, it must be strictly reserved for the same patient; cross-use between different patients is strictly prohibited.
• Monitoring and safety checks:
◦ During dialysis, closely monitor transmembrane pressure (TMP), extracorporeal circuit pressures, and blood flow rates to prevent blood clotting, membrane rupture, or air embolism.
◦ Regularly check the dialysate temperature (36–40°C), conductivity, and pH level to prevent hemolysis or pyrogenic reactions.
• Observation for complications: Remain vigilant for common dialysis-related complications, such as hypotension, muscle cramps, nausea, vomiting, and dialysis disequilibrium syndrome.
• Dietary and fluid management: Patients should adhere to restrictions on salt and fluid intake, as well as control their consumption of potassium and phosphorus, to reduce the burden on the dialyzer’s ultrafiltration and waste-removal processes.
