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Chronic Kidney Disease in Cats

Chronic kidney disease in cats is one of the most common and clinically important conditions in feline medicine, particularly in elderly cats. Although it is a progressive and irreversible disease, early detection and correct management may significantly improve quality of life and survival.

What Is Chronic Kidney Disease?

Also referred to as CKD, it is a progressive loss of kidney function over time.

The kidneys play essential roles in filtering metabolic waste from the bloodstream, maintaining fluid and electrolyte balance, regulating blood pressure, supporting red blood cell production through hormone regulation, etc.

As kidney function declines, waste products such as urea and creatinine accumulate, leading to the clinical signs associated with CKD.

Acute Kidney Injury and Chronic Kidney Disease

It is important to differentiate between acute kidney injury (AKI) and CKD. 

AKI is a sudden decline in kidney function, often due to toxins, infections, or severe dehydration. It may be reversible if addressed early. However, CKD is a gradual, irreversible process that develops over months to years. 

CKD is very common in senior cats, affecting a significant number of cats over 10 years of age.

What Causes Chronic Kidney Disease in Cats?

It is important to understand the causes of chronic kidney disease in cats for both prevention and management.

Some of the most common causes are degeneration related to age, infection or chronic inflammation, dental disease, genetic factors such as polycystic kidney disease, and previous episodes of acute kidney injury.

Also, there are some contributing factors such as hypertension, hyperthyroidism, exposure to nephrotoxins such as lilies or certain medications, and chronic dehydration. 

Progressive loss of functional nephrons can reduce the kidney’s ability to filter blood and concentrate urine, leading to a systemic effect.

Chronic Kidney Disease in Cats Stages

CKD is classified using the International Renal Interest Society staging system, which guides prognosis and also treatment decisions. Thus, understanding feline chronic kidney disease stages is very important for tailoring treatment and monitoring progression.

  • Stage 1, Early Disease: Often no clinical signs – minimal changes
  • Stage 2, Mild: Subtle clinical signs – early biochemical changes
  • Stage 3, Moderate: Clinical signs – progressive azotemia
  • Stage 4, Severe: Systemic impact – advanced kidney failure

What Are the Signs of Kidney Disease in Cats?

Some of the signs are:

Early Signs: increased thirst and urination, mild weight loss, and a decrease in appetite.

Progressive Symptoms: dehydration, poor quality of the coat, muscle wasting, intermittent vomiting, and halitosis.

Advanced Signs: lethargy, persistent vomiting, ulceration of the mouth, weight loss.

It is important to note that those symptoms often develop gradually. Thus, it is fundamental to have routine screening.

How Is Chronic Kidney Disease in Cats Diagnosed?

Diagnosis is based on a combination of laboratory findings, clinical evaluation, and imaging.

Laboratory Testing

  • Serum creatinine and blood urea nitrogen 
  • Symmetric dimethylarginine (SDMA) 
  • Urinalysis including urine specific gravity and protein evaluation 
  • Electrolyte assessment

Additional Diagnostics

  • Blood pressure measurement 
  • Imaging such as ultrasound 
  • Urine protein to creatinine ratio

Understanding SDMA in CKD

SDMA, or symmetric dimethylarginine, has become an essential biomarker in the early detection of chronic kidney disease in cats.

It is a byproduct of protein metabolism that is eliminated primarily through renal filtration. Because of this, it reflects glomerular filtration rate.

Clinical Importance

SDMA increases earlier than creatinine in kidney disease, typically when about 25 to 40 percent of kidney function is lost. Creatinine may not increase until approximately 75 percent of kidney function is compromised. SDMA is less influenced by muscle mass, making it particularly useful in cats with weight loss or muscle wasting.

Clinical Use

SDMA is interpreted alongside creatinine, urine concentration, and clinical signs. Thus, persistent elevation over time is more clinically meaningful than a single measurement. SDMA is also valuable for identifying early CKD stages.

Treatment for Chronic Kidney Disease in Cats

Unfortunately, there is no cure for CKD, but treatment focuses on slowing progression and improving the quality of life of the cats.

Medical Management includes: Therapeutic renal diets, hydration support, phosphate binders, blood pressure control, and anti-nausea therapy.

Nutritional and Holistic Support: It is one of the most critical components in the management of chronic kidney disease in cats.

What Should a Kidney Diet Look Like?

A renal diet is carefully formulated to reduce kidney workload while maintaining overall health. For example:

Controlled, high-quality protein: Protein should be moderately restricted but highly digestible to preserve lean body mass.

Low phosphorus: Essential to slow progression and reduce secondary complications. 

Increased moisture content: Wet diets are preferred to support hydration as they contain more water.

Adequate caloric density: To prevent weight loss and support energy needs.

Palatability: To encourage consistent food intake in kitties with reduced appetite.