Intermittent hemodialysis is a form of kidney replacement therapy in which a dialysis machine periodically removes waste products, excess fluid and certain electrolytes from the blood.
During treatment, blood is circulated through a specialized filter called a dialyzer. The dialyzer allows unwanted substances and excess fluid to be removed before the cleaned blood is returned to the body.
The treatment is called "intermittent" because it is performed during scheduled sessions rather than continuously throughout the day.
It may be used in people with advanced kidney failure and, in selected situations, in patients with severe acute kidney injury (AKI).
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized assessment and kidney replacement therapy planning based on the patient's medical condition.
How Does Intermittent Hemodialysis Work?
A typical treatment involves several stages.
1. Vascular Access
Blood needs to move safely between the patient and the dialysis machine.
Possible forms of access include:
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Arteriovenous fistula
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Arteriovenous graft
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Dialysis catheter
The choice depends on the clinical situation and whether dialysis is expected to be temporary or long-term.
2. Blood Circulation
Blood travels from the vascular access through tubing into the dialysis machine.
A pump controls the blood flow through the extracorporeal circuit.
3. Filtration Through the Dialyzer
Inside the dialyzer, blood flows alongside dialysis fluid across a semipermeable membrane.
Waste products and excess substances move from the blood into the dialysis fluid.
Excess fluid can also be removed through a process called ultrafiltration.
4. Return of Treated Blood
After passing through the dialyzer, the filtered blood is returned to the patient's circulation.
The process continues for the prescribed duration.
Why Is Intermittent Hemodialysis Needed?
The kidneys normally perform several important functions, including:
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Removing metabolic waste
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Regulating fluid balance
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Controlling electrolyte levels
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Maintaining acid-base balance
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Supporting blood-pressure regulation
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Producing hormones involved in red blood cell production
When kidney function becomes severely impaired, these functions may become inadequate.
Hemodialysis can replace some of the kidneys' filtering functions.
Intermittent Hemodialysis for Chronic Kidney Disease
People with advanced chronic kidney disease may eventually require kidney replacement therapy.
The decision to start dialysis is not based on creatinine or eGFR alone.
Doctors consider:
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Symptoms of kidney failure
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Fluid overload
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Electrolyte abnormalities
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Acid-base disturbances
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Nutritional status
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Overall health
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Response to medical treatment
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Patient preferences and goals
Some patients may receive hemodialysis as their long-term kidney replacement treatment.
Others may be evaluated for peritoneal dialysis or kidney transplantation.
Intermittent Hemodialysis in Acute Kidney Injury
Hemodialysis can also be used temporarily in severe acute kidney injury.
Possible situations include:
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Severe potassium elevation
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Significant fluid overload
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Severe metabolic acidosis
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Symptoms caused by accumulation of waste products
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Certain poisonings or drug toxicities
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Severe kidney dysfunction that cannot be adequately managed with medical treatment
In acute kidney injury, dialysis may sometimes be stopped if kidney function recovers sufficiently.
How Often Is Intermittent Hemodialysis Performed?
The schedule varies according to the patient's medical needs.
For many people receiving maintenance hemodialysis, treatment is performed several times each week.
However, the exact:
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Number of sessions
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Duration of each session
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Blood-flow rate
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Dialysis-fluid prescription
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Fluid-removal target
are individualized.
Patients with acute kidney injury may have a different schedule depending on their condition and laboratory results.
How Long Does a Hemodialysis Session Take?
The duration varies depending on:
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Kidney function
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Body size
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Fluid accumulation
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Dialysis prescription
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Vascular access
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Treatment goals
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Clinical stability
A dialysis team determines the appropriate treatment duration rather than using one fixed schedule for every patient.
What Happens During a Dialysis Session?
Before treatment, the dialysis team may check:
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Blood pressure
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Pulse
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Body weight
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Temperature when appropriate
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Vascular access
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Symptoms
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Fluid status
During dialysis, staff monitor the patient and dialysis machine.
After treatment, the patient may be weighed again and blood pressure may be checked.
The difference between pre- and post-dialysis weight can help assess fluid removal.
What Is Dry Weight in Hemodialysis?
Dry weight is an estimated target weight representing the patient's appropriate weight after excess fluid has been removed.
It is not simply a fixed number.
The dialysis team may adjust the target according to:
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Blood pressure
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Swelling
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Breathing symptoms
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Fluid accumulation
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Post-dialysis symptoms
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Changes in nutritional status
Accurate fluid assessment is important because removing too much fluid can cause low blood pressure and other problems.
What Are the Benefits of Intermittent Hemodialysis?
Hemodialysis can provide important support when the kidneys cannot adequately maintain the body's internal balance.
Potential benefits include:
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Removal of waste products
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Reduction of excess fluid
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Correction of certain electrolyte abnormalities
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Improvement of some symptoms related to kidney failure
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Management of certain life-threatening complications
For patients with irreversible advanced kidney failure, it can serve as long-term kidney replacement therapy.
For some patients with acute kidney injury, it may provide temporary support while the kidneys recover.
What Are the Possible Side Effects?
Some patients experience symptoms during or after treatment.
These may include:
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Low blood pressure
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Muscle cramps
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Fatigue
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Headache
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Nausea
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Dizziness
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Itching
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Feeling weak after dialysis
Not every patient experiences these problems.
The dialysis prescription can sometimes be adjusted to improve treatment tolerance.
Vascular Access Problems During Hemodialysis
The vascular access is essential for safe and effective dialysis.
Possible complications include:
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Infection
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Bleeding
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Blood clots
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Poor blood flow
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Narrowing of the access
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Fistula or graft malfunction
Patients should report:
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Redness
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Swelling
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Pain
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Bleeding
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Discharge
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Changes in the usual vibration or "thrill" of a fistula
Prompt evaluation can help protect the dialysis access.
What Is a Dialysis Catheter?
A dialysis catheter is a specialized tube inserted into a large vein.
It may be used when dialysis is needed urgently or when a permanent vascular access is not yet available.
Catheters can be useful in certain situations, but they generally have a higher infection risk than a well-functioning arteriovenous fistula.
For patients expected to require long-term hemodialysis, appropriate vascular-access planning is important.
Intermittent Hemodialysis vs Continuous Kidney Replacement Therapy
These therapies are used in different clinical situations.
Intermittent hemodialysis removes waste and fluid during scheduled treatment sessions.
Continuous kidney replacement therapies provide slower, continuous filtration and are commonly used for selected critically ill patients who may not tolerate rapid fluid or solute removal.
The appropriate modality depends on:
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Blood-pressure stability
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Fluid status
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Severity of illness
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Intensive-care requirements
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Kidney function
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Clinical goals
A nephrologist selects the appropriate treatment according to the patient's condition.
Can Hemodialysis Cure Kidney Failure?
Hemodialysis does not repair permanently damaged kidneys.
It replaces some of the filtering functions of the kidneys.
In acute kidney injury, dialysis may be temporary if kidney function recovers.
In established advanced kidney failure, long-term options may include:
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Maintenance dialysis
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Peritoneal dialysis
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Kidney transplantation
The appropriate option depends on the individual's medical condition.
Diet During Intermittent Hemodialysis
Dietary requirements vary significantly among dialysis patients.
A 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
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Calories
Fluid intake may need to be limited when the kidneys produce little urine and fluid accumulates between dialysis sessions.
Patients should not follow a generic online dialysis diet without discussing their individual laboratory results and treatment plan with their healthcare team.
Why Is Fluid Management Important?
When kidney function is severely reduced, the body may not be able to eliminate enough water.
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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Fluid accumulation around the lungs
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Increased strain on the heart
During hemodialysis, some of this excess fluid can be removed.
However, removing fluid too quickly can cause low blood pressure, cramps and other symptoms.
The fluid-removal goal therefore needs to be individualized.
Medicines for Patients Receiving Hemodialysis
Patients on hemodialysis may require medicines for complications associated with kidney disease.
Depending on individual needs, treatment may address:
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Blood pressure
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Anemia
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Iron deficiency
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Mineral and bone disorders
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Diabetes
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Cardiovascular risk
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Fluid overload
Some medicines may be removed by dialysis or require dose adjustment.
Patients should inform their nephrologist about every medicine, supplement and herbal preparation they use.
How Is Dialysis Adequacy Monitored?
The dialysis team regularly evaluates whether the prescribed treatment is providing adequate clearance.
Monitoring may include:
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Blood tests
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Urea measurements
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Electrolytes
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Fluid status
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Weight changes
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Blood-pressure trends
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Dialysis adequacy measurements
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Vascular-access performance
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Nutritional assessment
The treatment prescription may be modified when required.
What Should Patients Do Between Dialysis Sessions?
Patients can support their treatment by:
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Following the prescribed fluid limit
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Taking medicines as instructed
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Following their individualized diet
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Protecting vascular access
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Monitoring body weight when advised
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Attending every scheduled dialysis session
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Reporting new symptoms promptly
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Keeping regular nephrology appointments
Missing dialysis can allow waste products, potassium and fluid to accumulate.
What Happens If a Dialysis Session Is Missed?
Missing a scheduled treatment can be dangerous for some patients.
The consequences depend on residual kidney function and the patient's individual condition.
Possible problems include:
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Fluid overload
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High potassium
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Increased waste-product levels
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Breathlessness
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Swelling
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Worsening blood pressure
Patients who cannot attend a scheduled session should contact their dialysis team as soon as possible rather than simply waiting until the next appointment.
When Is Hemodialysis an Emergency Treatment?
Urgent dialysis may be considered when severe complications cannot be controlled adequately through other measures.
Examples include:
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Life-threatening hyperkalemia
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Severe fluid overload causing breathing difficulty
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Severe metabolic acidosis
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Certain toxin or drug poisonings
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Severe symptoms related to accumulation of waste products
The decision is based on the complete clinical picture rather than a single laboratory value.
Intermittent Hemodialysis and Kidney Transplantation
For suitable patients with advanced kidney failure, kidney transplantation may provide an alternative to long-term dialysis.
Patients receiving hemodialysis can undergo transplant evaluation when appropriate.
Transplant assessment considers factors such as:
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Overall health
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Cardiovascular condition
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Infections
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Other medical conditions
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Ability to undergo surgery
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Suitability for transplantation
A nephrologist can help determine when transplant evaluation should be considered.
Intermittent Hemodialysis Care at Prabhakar Bhurke Clinic
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized nephrology care for patients requiring dialysis and advanced kidney disease management.
Depending on the patient's condition, care may include:
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Assessment of dialysis requirements
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Hemodialysis planning
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Monitoring of dialysis patients
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Fluid and electrolyte management
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Blood-pressure management
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Anemia management
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Vascular-access monitoring
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Acute kidney injury evaluation
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Chronic kidney disease management
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Dialysis complication assessment
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Kidney transplant-related evaluation
Treatment decisions are based on kidney function, symptoms, laboratory results, underlying disease and the patient's overall health.
Frequently Asked Questions
What is intermittent hemodialysis?
Intermittent hemodialysis is a kidney replacement therapy performed during scheduled sessions. Blood passes through a dialyzer that removes waste products and excess fluid before returning the treated blood to the patient.
How many times a week is intermittent hemodialysis needed?
The schedule varies. Many patients receiving maintenance hemodialysis undergo treatment several times each week, while patients with acute kidney injury may have a different schedule based on their clinical condition.
Can intermittent hemodialysis be temporary?
Yes. In some cases of severe acute kidney injury, dialysis is needed temporarily while kidney function recovers.
Is hemodialysis painful?
The dialysis process itself is not usually described as painful, although needle placement for some vascular accesses and certain complications can cause discomfort.
Can patients eat during hemodialysis?
Dietary and treatment practices vary between dialysis centers and patients. Food choices should follow the individual's renal diet plan and dialysis team's recommendations.
What happens if someone misses dialysis?
Missing dialysis can allow fluid, potassium and waste products to accumulate. Patients should contact their dialysis team promptly if they cannot attend a scheduled session.
Is hemodialysis better than peritoneal dialysis?
Neither treatment is universally better. The choice depends on medical suitability, lifestyle, home circumstances, patient preference and other individual factors.
Conclusion
Intermittent hemodialysis is an important form of kidney replacement therapy that can remove waste products and excess fluid when the kidneys are unable to perform these functions adequately.
It may be used as temporary support during severe acute kidney injury or as long-term treatment for advanced kidney failure. The dialysis prescription—including treatment frequency, duration, fluid removal and blood-flow parameters—must be individualized.
Successful dialysis care also involves vascular-access protection, appropriate nutrition and fluid management, medication review, regular laboratory monitoring and prompt attention to complications.
For individualized evaluation and management of dialysis requirements, chronic kidney disease and kidney failure, consult Dr. Sandip Prabhakar Bhurke at Prabhakar Bhurke Clinic.
Medical Disclaimer
This article is intended for general educational and informational purposes only and does not constitute medical advice, diagnosis or treatment. Intermittent hemodialysis is a specialized medical treatment, and the decision to start dialysis, treatment frequency, duration and prescription must be determined by a qualified nephrology team. Do not change dialysis schedules, fluid restrictions, medicines or diet without professional guidance. Seek urgent medical attention for severe breathlessness, chest pain, confusion, fainting, severe swelling, very little or no urine, persistent vomiting or other sudden deterioration in health. Consult Dr. Sandip Prabhakar Bhurke or another qualified nephrologist for individualized dialysis and kidney-care recommendations.
