How Fluid Overload Affects Dialysis Patients: Signs You Should Know

Introduction

Managing fluid intake is an important part of daily care for many people undergoing dialysis. When the kidneys cannot remove enough excess water from the body, fluid may gradually build up between dialysis sessions. This condition is known as fluid overload.

Fluid overload is more than temporary weight gain. It can cause swelling, increase blood pressure, affect breathing, and place additional strain on the heart. Understanding the warning signs and following an individual fluid management plan can help dialysis patients protect their health.

What Is Fluid Overload?

Fluid overload, also called fluid retention or hypervolemia, occurs when excess fluid accumulates in the body. Healthy kidneys normally regulate the body's fluid balance by removing extra water through urine.

When kidney function is severely reduced, the body may not be able to remove enough fluid naturally. Dialysis helps remove excess fluid, but fluid can build up again between treatment sessions, particularly when fluid intake is greater than the amount the body can eliminate.

Why Does Fluid Overload Occur in Dialysis Patients?

Fluid overload can happen for several reasons, including:

• Reduced urine production due to impaired kidney function.
• Consuming more fluids than the amount recommended by the healthcare team.
• Eating foods high in salt, which can increase thirst and encourage fluid retention.
• Missing or shortening scheduled dialysis sessions.
• Changes in health conditions that affect the body's fluid balance.

Each patient's fluid requirements are different. The recommended amount depends on factors such as remaining kidney function, urine output, body weight, and dialysis schedule.

Common Signs and Symptoms of Fluid Overload

Recognising early changes can help patients seek medical advice before the problem becomes more serious. Common signs include:

1. Swelling in the Body

Extra fluid may collect in the feet, ankles, legs, hands, or face. This swelling is known as oedema. Patients may notice that footwear feels tighter or that their usual rings no longer fit comfortably.

2. Sudden Weight Gain

A rapid increase in body weight between dialysis sessions may indicate that excess fluid is accumulating. Regular weight monitoring, as advised by the dialysis team, helps identify these changes.

3. Increased Blood Pressure

Extra fluid circulating in the bloodstream can increase blood pressure and make the heart work harder. Patients should monitor their blood pressure according to their healthcare team's instructions.

4. Breathlessness

In some cases, excess fluid can accumulate in or around the lungs, making breathing difficult. Patients may experience breathlessness during activity or while lying down. Sudden or severe breathing difficulty needs emergency medical attention.

5. Tiredness and Physical Discomfort

Fluid overload may be associated with headaches, abdominal discomfort, or a general feeling of heaviness and reduced energy. These symptoms can have other causes too, so they should be discussed with a healthcare professional.

How Can Fluid Overload Affect the Heart and Lungs?

Excess fluid increases the amount of fluid circulating through the body. This can raise blood pressure and place additional workload on the heart.

If fluid accumulates in the lungs, it may cause breathing difficulties. Severe fluid accumulation can lead to serious complications and requires prompt medical assessment.

For this reason, fluid management is an important part of the overall dialysis care plan, rather than simply a matter of controlling thirst.

Practical Ways to Manage Fluid Intake Between Dialysis Sessions

Patients can work with their nephrologist and renal dietitian to develop a fluid management plan that suits their individual needs. Helpful practices may include:

1. Follow Your Recommended Fluid Allowance

Ask your dialysis team how much fluid you can consume each day. Do not follow another patient's fluid limit, as your requirement may be different.

2. Track All Sources of Fluid

Fluid intake includes more than drinking water. Tea, coffee, milk, juice, soups, porridge, ice, ice cream, and other foods that are liquid at room temperature may also contribute to daily fluid intake.

3. Reduce Excess Salt

High-sodium foods can increase thirst and encourage the body to retain fluid. Follow the dietary advice provided by your renal dietitian, and be mindful of packaged snacks, pickles, processed foods, and salty sauces.

4. Monitor Your Weight Regularly

Follow your dialysis team's instructions for checking your weight, particularly before and after treatment. Report unexpected or rapid weight changes rather than trying to manage them on your own.

5. Attend Scheduled Dialysis Sessions

Do not skip or shorten dialysis sessions without discussing it with your healthcare team. If you cannot attend an appointment, contact your dialysis centre promptly for guidance.

What Is Dry Weight and Why Does It Matter?

Dry weight, also called target weight, is the weight a dialysis team aims for after removing excess fluid during treatment. It is an important reference point when assessing fluid balance.

Your target weight is determined by your healthcare team and may need adjustment as your health changes. Weight gain between dialysis sessions can help the team understand how much fluid may have accumulated.

Do not attempt to change your fluid intake or dialysis treatment independently based on a weight reading. Discuss changes with your nephrologist or dialysis team.

When Should You Contact Your Dialysis Team?

Contact your dialysis centre or healthcare professional if you notice:

• New or increasing swelling in your feet, ankles, hands, or face.
• Unexpected weight gain between dialysis sessions.
• Blood pressure readings that are higher than your usual range.
• New breathlessness, especially when lying down or during routine activities.
• Repeated discomfort or difficulty managing your prescribed fluid allowance.

Severe or sudden breathlessness, chest pain, fainting, or confusion requires emergency medical attention. Do not wait for your next dialysis appointment.

How Does the Dialysis Care Team Help?

The dialysis team monitors patients' weight, blood pressure, symptoms, and response to treatment. They assess fluid removal during dialysis and may review the treatment plan when fluid balance becomes difficult to manage.

Nephrologists, dialysis nurses, and renal dietitians work together to guide patients on fluid intake, dietary choices, and treatment schedules. Patients should share any new symptoms or concerns with their care team.

Conclusion

Fluid overload is an important concern for many people receiving dialysis. Swelling, sudden weight gain, increased blood pressure, and breathing difficulties can be warning signs that excess fluid is building up in the body.

Following an individual fluid allowance, reducing excess salt, monitoring weight, and attending scheduled dialysis sessions can support better fluid management. Most importantly, patients should report unusual symptoms promptly and follow the advice of their nephrologist and dialysis team.

Understanding fluid balance is an important step towards safer and more informed dialysis care.