Protein Losing Nephropathy

TL;DR. Protein-losing nephropathy (PLN) is a serious kidney disorder in dogs and cats where the kidneys leak vital proteins into the urine, leading to fluid retention, high blood pressure, and potentially life-threatening blood

Fluid accumulation in the abdomen (ascites) is a common sign of advanced protein-losing nephropathy.

Che cos’è

Protein-losing nephropathy (PLN) is not a single disease, but rather a group of serious kidney disorders that affect dogs and cats. To understand PLN, it helps to picture how a healthy kidney works. Inside each kidney are hundreds of thousands of microscopic filtering units called glomeruli. These structures act like tiny, highly selective sieves. They allow waste products and excess water to pass through into the urine while keeping essential components-like blood cells and large proteins-insid

"A diagnosis of protein-losing nephropathy (PLN) is made by documentation of persistent proteinuria that cannot be explained by inflammation of the lower urinary tract or blood contamination of the urine."

Cause e fattori di rischio

PLN can develop as a primary, inherited condition or secondary to other underlying diseases. The two most common pathological processes that cause PLN are glomerulonephritis (inflammation of the glomeruli) and amyloidosis (the abnormal deposition of a protein called amyloid in the kidney tissues). Many cases of glomerulonephritis are immune-mediated, meaning the pet's own immune system creates antibody complexes that get trapped in the glomerular filters, causing chronic inflammation and damage.

Segni

• Proteinuria (Cardinal): Excess protein in the urine. This is the hallmark sign of PLN, though it cannot be seen with the naked eye and must be detected through laboratory tests.
• Hypoalbuminemia (Common): Low levels of albumin in the blood, identified via routine blood work.
• Edema (Occasional): Swelling in the limbs, face, or under the chest due to fluid leaking from blood vessels.
• Ascites (Occasional): A distended, fluid-filled abdomen.
• Polyuria and Polydipsia (Occasional): Increased urination and increased thirst, which occur as the kidneys lose their ability to concentrate urine.
• Weight Loss and Vomiting (Occasional): General signs of chronic kidney disease and the buildup of toxins in the blood (uremia).

Quando rivolgersi al veterinario

If your pet has been diagnosed with PLN or belongs to a predisposed breed, you should monitor them closely for any changes in behavior or physical appearance. Contact your vet if you notice gradual weight loss, a dull coat, decreased appetite, or mild swelling in the paws. EMERGENCY RED FLAGS: Seek immediate, emergency veterinary care if your pet displays any of the following signs: * **Sudd

Diagnosi

Diagnosing PLN requires a systematic approach to confirm that protein is indeed leaking from the kidneys and to rule out other potential causes. As a leading veterinary internal medicine reference notes: Your vet will begin with a comprehensive physical exam and a series of core diagnostic tests: * Urinalysis: This is the first step. The vet will use a urine dipstick to estimate protein leve

Trattamento

Treatment for PLN is multi-faceted, focusing on reducing protein loss, managing blood pressure, preventing blood clots, and controlling fluid retention. ### First-Line Therapies The primary goal of initial treatment is to lower the pressure within the glomerular filters, which helps reduce the amount of protein leaking into the urine. * Angiotensin-Converting Enzyme (ACE) Inhibitors: Medicat

Prevenzione e vita quotidiana

Because most cases of PLN are caused by genetic predispositions or unpredictable immune-mediated responses, the disease is generally not preventable. However, for breeds known to be at high risk, proactive screening is the best defense. Regular urinalysis and blood pressure checks during annual veterinary exams can detect early-stage proteinuria b

Fonti

Veterinary internal medicine references for this condition.

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