The term “artificial kidney” is commonly used to describe a dialysis machine and dialyzer, particularly during hemodialysis. This treatment helps perform some of the important filtering functions normally carried out by healthy kidneys.
When kidney function becomes severely reduced, waste products, excess salts and extra fluid can accumulate in the bloodstream. Hemodialysis uses an external filtering system to remove some of these substances and help maintain the body's internal balance.
Artificial kidney dialysis does not completely reproduce every function of a healthy kidney. Instead, it provides kidney replacement therapy for selected patients whose kidneys cannot adequately perform their essential functions.
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized evaluation and management for patients requiring dialysis and advanced kidney care.
How Does an Artificial Kidney Work?
During hemodialysis, blood is circulated outside the body through a specialized filter called a dialyzer.
The basic process involves:
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Blood is taken from the body through a suitable vascular access.
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Blood travels through the dialysis machine.
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The dialyzer filters waste products and removes excess fluid.
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Important substances are regulated through the dialysis process.
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The cleaned blood is returned to the body.
The dialysis machine controls important aspects of the treatment, including the movement of blood and dialysis fluid.
What Does the Dialyzer Remove?
A healthy kidney continuously filters the blood.
Hemodialysis can help remove substances that accumulate when kidney function is severely impaired, including:
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Urea
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Creatinine
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Excess fluid
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Certain electrolytes
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Other metabolic waste products
The exact amount removed depends on the patient's kidney function, dialysis prescription, treatment duration and other factors.
Why Do Patients Need Artificial Kidney Dialysis?
Dialysis may be required when kidney function becomes insufficient to maintain the body's internal environment.
This may happen because of:
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Advanced chronic kidney disease
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Kidney failure
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Severe acute kidney injury
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Certain metabolic emergencies
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Severe fluid overload
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Dangerous electrolyte abnormalities
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Significant acid-base disturbances
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Uremic complications
The decision to start dialysis is based on the patient's complete medical condition rather than a single blood-test value.
Is Artificial Kidney Dialysis the Same as Hemodialysis?
In most everyday medical discussions, “artificial kidney” commonly refers to the dialyzer used during hemodialysis.
However, dialysis is a broader term that includes different kidney replacement therapies.
The two major forms of dialysis are:
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Hemodialysis
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Peritoneal dialysis
Hemodialysis uses an external filter, while peritoneal dialysis uses the patient's peritoneal membrane inside the abdomen as the filtering surface.
How Is Hemodialysis Performed?
A typical hemodialysis session follows several steps.
Vascular Access
Blood needs to move safely between the patient and dialysis machine.
Common access types include:
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Arteriovenous fistula
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Arteriovenous graft
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Central venous catheter
For patients expected to require long-term hemodialysis, an arteriovenous fistula may be preferred when appropriate because of its durability and lower infection risk compared with some catheter-based approaches.
Blood Filtration
Blood passes through the dialyzer, where waste products and excess fluid are removed.
Return of Blood
The filtered blood is returned to the patient's circulation.
The dialysis prescription is adjusted according to the individual's clinical needs.
What Is an AV Fistula?
An arteriovenous fistula (AV fistula) is a surgically created connection between an artery and a vein, usually in the arm.
It provides vascular access for hemodialysis.
A fistula generally needs time to mature before it can be used reliably. Planning access early can therefore be important for patients with progressive chronic kidney disease who are likely to need hemodialysis.
How Long Does Artificial Kidney Dialysis Take?
The duration and frequency of hemodialysis depend on:
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Residual kidney function
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Body size
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Fluid accumulation
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Laboratory results
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Dialysis adequacy
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Medical condition
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Type of dialysis prescription
Many people receiving maintenance hemodialysis undergo treatment several times per week, with each session lasting several hours.
The schedule is individualized by the nephrology team.
What Happens During a Dialysis Session?
During treatment, healthcare professionals monitor the patient for:
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Blood pressure
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Heart rate
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Fluid removal
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Symptoms
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Vascular access condition
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Treatment response
Some patients may experience tiredness, muscle cramps, headache or changes in blood pressure during or after dialysis.
Not every patient experiences these effects, and dialysis prescriptions can sometimes be adjusted to improve tolerance.
Benefits of Artificial Kidney Dialysis
When medically indicated, dialysis can provide important benefits.
It can help:
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Remove accumulated waste products
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Control excess fluid
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Manage certain electrolyte abnormalities
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Correct some acid-base disturbances
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Reduce symptoms related to severe kidney failure
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Support patients while awaiting kidney recovery
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Provide long-term kidney replacement therapy when appropriate
Dialysis can be life-sustaining for patients whose kidneys are unable to maintain essential body functions.
Does Dialysis Cure Kidney Failure?
Dialysis does not cure chronic kidney failure.
It replaces some kidney functions but does not restore the full biological functions of healthy kidneys.
In acute kidney injury, dialysis may sometimes be temporary if the kidneys recover.
In advanced chronic kidney disease, long-term dialysis may be required unless a suitable kidney transplant or another appropriate treatment becomes available.
Artificial Kidney Dialysis for Acute Kidney Injury
Acute kidney injury can develop rapidly because of conditions such as:
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Severe infection
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Dehydration
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Low blood pressure
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Certain medications or toxins
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Major surgery
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Urinary obstruction
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Severe medical illness
Some patients with severe AKI require temporary dialysis.
If kidney function recovers, dialysis may eventually be discontinued.
Artificial Kidney Dialysis for Chronic Kidney Disease
Chronic kidney disease develops over time.
As kidney function progressively declines, patients may eventually reach advanced kidney failure.
Before dialysis becomes necessary, nephrologists often focus on:
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Treating the underlying kidney disease
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Controlling blood pressure
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Managing diabetes
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Reducing cardiovascular risk
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Managing anemia and mineral abnormalities
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Providing dietary guidance
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Planning kidney replacement therapy
Early preparation can help patients make informed decisions about their treatment options.
Can Dialysis Be Avoided?
Not every person with reduced kidney function needs dialysis.
In some situations, kidney function can improve after treating the underlying cause.
For example, kidney dysfunction associated with certain episodes of acute kidney injury may be reversible.
For advanced chronic kidney failure, dialysis may become necessary when complications can no longer be adequately controlled through medical management.
The goal should be appropriate treatment rather than avoiding dialysis regardless of medical necessity.
Artificial Kidney Dialysis vs Kidney Transplant
Dialysis and kidney transplantation are different forms of kidney replacement therapy.
Dialysis
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Uses a machine or peritoneal membrane to remove waste and fluid
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Requires ongoing treatment when kidney failure is permanent
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Can be used temporarily in selected cases of acute kidney injury
Kidney Transplant
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Uses a functioning donor kidney
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Can provide more complete kidney function than dialysis
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Requires surgery and long-term anti-rejection medication
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Requires careful patient evaluation
For suitable patients with advanced kidney failure, transplantation may offer an alternative to long-term dialysis.
What Are the Possible Risks of Hemodialysis?
Hemodialysis is generally performed under medical supervision, but complications can occur.
Potential problems include:
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Low blood pressure
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Muscle cramps
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Fatigue
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Nausea
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Headache
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Vascular access infection
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Vascular access blockage
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Bleeding
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Dialysis disequilibrium in specific circumstances
Regular monitoring and proper vascular-access care help reduce complications.
Caring for Dialysis Access
Vascular access is essential for hemodialysis.
Patients should follow their healthcare team's instructions regarding access care.
Depending on the type of access, patients may be advised to:
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Keep the access area clean
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Monitor for redness or swelling
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Report pain or discharge
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Watch for signs of infection
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Check the fistula for the expected blood-flow vibration when instructed
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Avoid unnecessary pressure or injury to the access arm
Any sudden change in access function should be reported promptly.
Diet During Artificial Kidney Dialysis
Dietary needs vary between dialysis patients.
Depending on blood tests and medical circumstances, the nephrologist and renal dietitian may provide guidance about:
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Sodium
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Potassium
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Phosphorus
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Protein
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Fluid intake
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Calories
There is no single “dialysis diet” that is suitable for everyone.
Diet should be personalized according to residual kidney function, dialysis schedule, laboratory results and nutritional status.
Fluid Restriction During Dialysis
Patients who produce little urine may accumulate fluid between dialysis sessions.
Excess fluid can cause:
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Swelling
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High blood pressure
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Breathlessness
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Increased workload on the heart
Fluid recommendations are individualized.
Patients should not dramatically increase or restrict fluid intake without discussing it with their healthcare team.
Artificial Kidney Dialysis and Creatinine
Creatinine is one of the waste products removed during dialysis.
Creatinine levels generally fall after a dialysis treatment and may increase again between sessions when kidney function remains severely impaired.
However, dialysis decisions should not be based on creatinine alone.
Doctors consider symptoms, fluid balance, electrolytes, acid-base status, urine output, kidney-function trends and other clinical factors.
What Is Dialysis Adequacy?
Dialysis adequacy refers to whether dialysis is providing sufficient removal of waste products and appropriate fluid management.
The nephrology team may assess:
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Treatment duration
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Dialysis frequency
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Blood-flow rate
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Dialysate flow
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Patient's residual kidney function
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Laboratory measurements
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Clinical condition
Dialysis prescriptions may be adjusted when necessary.
When Should a Patient Contact the Dialysis Team?
Patients receiving dialysis should promptly report symptoms such as:
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Fever
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Chills
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Redness or discharge around access
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Persistent breathlessness
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Chest pain
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Severe weakness
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Unusual bleeding
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Sudden access malfunction
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Severe swelling
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Confusion
Some of these symptoms can indicate complications requiring urgent assessment.
Artificial Kidney Dialysis at Prabhakar Bhurke Clinic
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides comprehensive kidney care for patients with advanced kidney disease and dialysis-related needs.
Individualized care may include:
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Assessment of kidney function
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Evaluation of dialysis requirements
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Hemodialysis management
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Management of dialysis complications
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Vascular-access coordination and monitoring
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Fluid and electrolyte management
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Nutrition-related guidance
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Chronic kidney disease management
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Evaluation for kidney transplantation
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Long-term kidney replacement therapy planning
The appropriate treatment is determined after evaluating the patient's kidney function, symptoms, laboratory findings and overall medical condition.
Frequently Asked Questions About Artificial Kidney Dialysis
What is an artificial kidney?
An artificial kidney commonly refers to the dialyzer used during hemodialysis. It is a specialized filter that helps remove waste products and excess fluid from the blood.
Is an artificial kidney the same as a dialysis machine?
Not exactly. The dialyzer is the filter, while the dialysis machine controls the circulation of blood and dialysis fluid and monitors the treatment.
Does artificial kidney dialysis replace the kidneys completely?
No. Dialysis replaces some important kidney functions but does not reproduce every function of healthy kidneys.
Can dialysis be temporary?
Yes. In some cases of severe acute kidney injury, dialysis may be needed temporarily while kidney function recovers.
How often is hemodialysis required?
The schedule varies according to the patient's medical condition and dialysis prescription. Many patients receiving maintenance hemodialysis undergo treatment multiple times each week.
Is kidney transplant better than dialysis?
For suitable candidates, kidney transplantation can provide more complete kidney replacement than dialysis. However, transplantation requires careful medical evaluation and is not appropriate for every patient.
Conclusion
Artificial kidney dialysis, most commonly referring to the dialyzer used during hemodialysis, provides an important form of kidney replacement therapy for people whose kidneys cannot adequately remove waste and excess fluid.
Dialysis can help control complications of severe kidney dysfunction, but it does not completely reproduce the functions of healthy kidneys. In acute kidney injury, dialysis may be temporary, while advanced chronic kidney failure may require ongoing treatment.
The decision to start dialysis should never be based on a single creatinine value or laboratory result. A nephrologist evaluates kidney function, symptoms, fluid status, electrolyte abnormalities, urine output and the underlying cause before determining the appropriate treatment.
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides personalized assessment and management for patients requiring dialysis and advanced kidney care.
Medical Disclaimer
This article is provided for general educational purposes and does not constitute medical advice, diagnosis or treatment. Dialysis requirements vary significantly between patients and must be determined by a qualified nephrologist after a complete clinical evaluation. Do not start, stop or modify dialysis, medicines, fluid restrictions or dietary restrictions based solely on this article. Patients experiencing severe breathlessness, chest pain, confusion, very low or absent urine output, severe swelling, high fever or other rapidly worsening symptoms should seek urgent medical attention.
