Dialysis Dependency: Causes, Symptoms & Treatment
Dialysis dependency refers to the condition in which the kidneys can no longer filter the blood adequately, requiring a patient to rely permanently on a renal replacement therapy.
Things worth knowing about "Dialysis dependency"
Dialysis dependency refers to the condition in which the kidneys can no longer filter the blood adequately, requiring a patient to rely permanently on a renal replacement therapy.
What is Dialysis Dependency?
Dialysis dependency describes the medical condition in which a patient's kidneys have permanently and severely lost their ability to filter blood, remove waste products, and regulate fluid balance. In this state, the patient requires a lifelong renal replacement therapy – most commonly dialysis – in order to survive.
Dialysis dependency typically occurs at the final stage of chronic kidney disease (CKD), known as end-stage renal disease (ESRD) or CKD Stage G5. At this stage, the glomerular filtration rate (GFR) is permanently below 15 ml/min/1.73 m².
Causes
The most common causes of dialysis dependency include:
- Diabetic nephropathy: Kidney damage caused by long-term poorly controlled diabetes mellitus – the single most common cause worldwide.
- Arterial hypertension: Chronically elevated blood pressure damages the small blood vessels within the kidneys.
- Glomerulonephritis: Inflammatory diseases affecting the kidney's filtration units (glomeruli).
- Polycystic kidney disease (PKD): A hereditary condition characterized by the growth of numerous cysts in the kidneys.
- Recurrent urinary tract infections and pyelonephritis: Can lead to chronic kidney damage if inadequately treated.
- Drug-induced or toxic nephropathy: For example, caused by non-steroidal anti-inflammatory drugs (NSAIDs) or contrast agents.
- Acute kidney injury: In rare cases, it can progress to permanent kidney failure.
Symptoms
In advanced kidney failure leading to dialysis dependency, the following symptoms may occur:
- Severe fatigue and weakness (uraemic encephalopathy)
- Fluid retention in the tissues (oedema), particularly in the legs and around the eyes
- Nausea, vomiting, and loss of appetite
- Skin itching caused by the accumulation of urea (uraemic pruritus)
- Shortness of breath due to fluid accumulation in the lungs
- Difficult-to-control high blood pressure
- Reduced urine output or complete absence of urine
- Difficulty concentrating and confusion
Diagnosis
The diagnosis of dialysis dependency is established through the following investigations:
- Blood tests: Measurement of creatinine, urea, electrolytes (especially potassium), and estimated glomerular filtration rate (eGFR).
- Urine tests: Detection of protein or blood in the urine as indicators of kidney damage.
- Kidney ultrasound: Assessment of kidney size and structure.
- Kidney biopsy: Tissue sampling to clarify the underlying cause, if required.
- Clinical assessment: Evaluation of symptoms of uraemia (accumulation of waste products in the blood) and fluid overload.
Treatment and Renal Replacement Therapy
Once dialysis dependency is established, several renal replacement therapy options are available:
Haemodialysis
In haemodialysis, the patient's blood is circulated through an external circuit and filtered by a dialysis machine that acts as an artificial kidney. Treatment is typically performed three times per week at a dialysis centre and lasts approximately four to five hours per session.
Peritoneal Dialysis
In peritoneal dialysis, the natural membrane lining the abdominal cavity (the peritoneum) is used as a filter. A special cleansing fluid is introduced into the abdominal cavity through a catheter, absorbs waste products, and is then drained. This method can often be performed at home by the patient.
Kidney Transplantation
Kidney transplantation is the preferred treatment option for eligible patients, as it significantly improves quality of life and extends life expectancy compared to long-term dialysis. It requires the availability of a compatible donor organ.
Quality of Life and Long-Term Care
Dialysis-dependent patients require continuous medical follow-up, including regular laboratory monitoring, a tailored diet (e.g., restriction of potassium, phosphate, and fluid intake), blood pressure management, and treatment of associated conditions such as anaemia and mineral bone disorders. Psychosocial support is also an important aspect of care, as dialysis dependency has a significant impact on everyday life.
References
- Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney International, 2024.
- Levey AS, Coresh J. Chronic kidney disease. The Lancet, 2012; 379(9811): 165–180.
- United States Renal Data System (USRDS). 2023 Annual Data Report: Epidemiology of Kidney Disease in the United States. National Institutes of Health, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, 2023.
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