About Stage 4 Chronic Kidney Disease

Overview

Stage 4 chronic kidney disease (CKD) is a severe stage of kidney damage where the kidneys have experienced significant impairment in their function. At this stage, the kidneys are operating at a glomerular filtration rate (GFR) of 15-29 mL/min/1.73m², which indicates a severe reduction in kidney function.

Stage 4 CKD is the last stage before kidney failure (Stage 5) and may require treatments such as dialysis or kidney transplantation. People with Stage 4 CKD are likely to experience a range of symptoms due to the severe kidney damage. However, it is possible to slow down the progression of CKD through proper management and regular consultation with a healthcare professional. It's important to discuss treatment options and strategies for managing symptoms with your doctor.

Causes and Risk Factors

Stage 4 chronic kidney disease (CKD) is characterized by severe kidney damage and is the final stage before complete kidney failure.

Non-modifiable risk factors are factors that cannot be changed. These are:

• Age: Advanced age is associated with a higher risk of CKD progression.
• Gender: In adults, males have a higher risk of CKD progression compared to females.
• Race: Certain racial and ethnic groups, such as African Americans, Hispanics, and Native Americans, have a higher prevalence of CKD and are at increased risk of progression.
• Cause of CKD: The underlying cause of CKD, such as glomerular diseases or hemolytic uremic syndrome, can influence the progression to Stage 4 CKD.
• Stage of CKD at the beginning of follow-up: A more advanced stage of CKD at the start of monitoring is associated with a higher likelihood of progression.

Modifiable risk factors are factors that can be influenced or changed. These are:

• Proteinuria: Increased protein levels in the urine can accelerate CKD progression.
• Arterial hypertension: Elevated blood pressure is a significant factor in the progression of CKD. Proper blood pressure control is crucial in slowing down the disease.
• Untreated metabolic disorders: Anemia, acidosis, and hyperphosphatemia can contribute to the progression of CKD.

It's important to note that these risk factors can vary among individuals. Early detection, proper management, and regular consultation with a healthcare professional are essential in slowing down the progression of Stage 4 CKD.

Symptoms

In the early stages of Stage 4 chronic kidney disease (CKD), symptoms may not be noticeable. However, as CKD progresses or becomes more severe, common symptoms that may occur include:

• Trouble concentrating
• Nausea
• Dry skin
• Itching or numbness
• Feeling tired
• Headaches
• Chest pain
• Increased or decreased urination
• Loss of appetite
• Muscle cramps

Later Stages/Progression/Higher Severity Symptoms:

• Fatigue and weakness
• Persistent itching
• Foamy or bubbly urine
• Blood in the urine (hematuria)
• Swelling in the legs, ankles, or face (edema)
• A loss of appetite
• High blood pressure
• Lower back pain
• Difficulty sleeping
• Cognitive changes and trouble concentrating

It's important to note that individuals may not experience all of these symptoms, and some symptoms may be more prevalent in later stages of CKD. If you are experiencing any of these symptoms or have concerns about your kidney health, it is recommended to speak with a healthcare professional for further evaluation and guidance.

Diagnosis

To diagnose Stage 4 chronic kidney disease (CKD), the following examinations, tests, and procedures are commonly performed:

• Medical history review: A doctor will gather information about your overall health, symptoms, and any risk factors for kidney disease.
• Physical examination: A doctor will perform a physical exam to check for signs of kidney disease, such as swelling in the legs or high blood pressure.
• Blood tests: Blood tests are done to measure the level of waste products and substances in the blood, such as creatinine and blood urea nitrogen (BUN). These tests help estimate the glomerular filtration rate (GFR), which indicates how well the kidneys are functioning.
• Urine tests: Urine tests are done to check for the presence of protein or blood in the urine, which can be signs of kidney damage.
• Imaging tests: Imaging tests like ultrasound may be used to assess the size and structure of the kidneys and detect any abnormalities.
• eGFR: A blood test called an estimated glomerular filtration rate (eGFR) is taken to measure the amount of creatinine in your blood. Creatinine is an amino acid that can indicate how well your kidneys are filtering waste. An abnormally high creatinine level suggests that your kidneys are not functioning optimally. The eGFR reading determines the stage of CKD. In Stage 4 CKD, the eGFR reading falls between 15 and 29. This indicates severe loss of kidney function.

To determine the stage or severity of CKD, additional examinations, tests, and procedures may be performed:

• Repeat blood and urine tests: Regular monitoring of blood and urine tests over time can help track changes in kidney function and determine if the disease is progressing.
• Kidney biopsy: In some cases, a kidney biopsy may be recommended to examine a small sample of kidney tissue under a microscope. This can provide more detailed information about the cause and severity of kidney damage.
• Additional imaging tests: Depending on individual circumstances, additional imaging tests such as CT scans or MRI scans may be performed to evaluate the kidneys further.

It's important to work closely with your healthcare team to undergo these examinations, tests, and procedures for an accurate diagnosis and determination of the stage or severity of Stage 4 CKD.

Treatment Options

The goals of treatment for Stage 4 chronic kidney disease (CKD) are to slow down the progression of the disease, manage complications and symptoms, prevent or delay the onset of end-stage kidney disease, and improve the patient's quality of life.

To achieve these goals, the following treatments and interventions may be recommended:

• Medication types: Blood pressure medications, such as ACE inhibitors, may be prescribed to control hypertension and protect the kidneys. Erythropoiesis-stimulating agents (ESAs) or iron supplements can help manage anemia associated with CKD. Medications for diabetes management may be necessary if diabetes is present.
• Therapies: Dialysis or kidney transplantation may be necessary in advanced stages of CKD when kidney function is significantly impaired. These interventions replace kidney function and help maintain overall health.
• Therapeutic procedures: Regular monitoring by a kidney specialist (nephrologist) is essential to assess kidney function and disease progression. Blood tests, urine tests, and other diagnostic tests may be ordered to evaluate kidney function, electrolyte levels, and cardiovascular risk.
• Health behavior changes: Lifestyle modifications such as following a kidney-friendly diet low in salt, phosphorus, and potassium can help manage CKD. Quitting smoking, maintaining a healthy weight, exercising regularly, and managing other co-existing health conditions like diabetes and high cholesterol are also important.
• Other treatments: Supportive care focuses on managing co-existing health conditions, monitoring for heart disease, and addressing symptoms associated with CKD.

It's important to consult with a healthcare professional who can tailor the treatment plan based on individual needs. They will provide guidance on medication dosing and potential side effects. Regular follow-up visits with a nephrologist are crucial to monitor the disease's progression and optimize treatment strategies.

Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Other side effects can occur. Check with your health care professional or read the information provided with your medication for additional side effect information.