Nephrotic Syndrome (kidney dysfunction with protein loss) in cats
- Occurrence: common
- Location of illness: Abdomen/pelvis
When to visit the vet?
Urgent see a veterinarian within 24 hours
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in cats is a kidney disease characterized by increased permeability of the kidney filtration membrane, leading to a significant loss of proteins via the urine.
BASICS/CAUSES:
The kidneys play a crucial role in a cat’s body by filtering blood and excreting waste products via urine. One of the core functions of the kidneys is maintaining the correct amount of proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. in the blood. These proteins are essential for various bodily functions, including maintaining osmotic pressureOsmotic pressure is the pressure created by the diffusion of water across a semipermeable membrane, driven by differences in solute concentration on either side of the membrane. It plays an important role in the water and electrolyte balance of cells., preventing edemaAn edema is a buildup of fluid in the body’s tissues, leading to Swelling. Edema can be localized or generalized and is often a sign of an underlying condition., and supporting the immune systemThe immune system is the body’s defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body..
In nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment., the normal barrier function of the kidney filtration membrane is disrupted. This membrane is normally selectively permeable, meaning it retains certain molecules and allows others to pass through. When this function is disturbed, large proteins like albuminalbumin is the most abundant protein in blood plasma and has important functions, such as transporting substances in the blood and maintaining osmotic pressure, which is crucial for the distribution of body fluids. can enter the urine. This leads to a loss of important proteins and can cause a range of health complications.
The causes of nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. can be diverse. A common cause is glomerular damage, which can be triggered by various factors, including immunological diseases, infections, and genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases.. Systemic diseases such as diabetes mellitus and high blood pressure can also lead to kidney damage and increase the risk of nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment..
Another possible triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. is inflammatory processes within the kidneys, which can be caused by bacterial or viralViral refers to viruses and their effects on the organism. Viral infections in dogs and cats can range from harmless colds to severe, life-threatening diseases. infections. ToxicToxic means “poisonous” and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. influences, such as the intake of certain medications or the presence of heavy metals in the body, can also impair kidney function and lead to proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. loss in the urine.
The most important facts at a glance
Nephrotic syndrome in cats is a serious condition characterized by proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. loss through the kidneys. Common causes include glomerulonephritis, systemic diseases such as diabetes, and toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. kidney damage. Symptoms include swelling in the legs, ascitesAscites refers to the accumulation of free fluid in the abdominal cavity, which can lead to visible abdominal distension. It can be caused by various diseases, including liver disease, cancer, or heart failure., and shortness of breath. Occasionally, vision problems and cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems. also occur. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made through a physical examination, urine and blood tests, and possibly a kidney biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions.. TherapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. focuses on alleviating symptoms and treating the underlying cause. Dietary adjustments and medications such as ACE inhibitors can help stabilize the condition. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. varies depending on the severity of the disease and the response to therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions.. Early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. can improve the cat’s quality of life. Preventive measures include a balanced diet, avoiding toxins, and regular veterinary examinations. StressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. reduction and avoiding overweight are also important to support kidney function. Regular vaccinations and deworming can reduce the risk of kidney infections. Close collaboration with a veterinarian is crucial to monitor the course of the disease and adjust the therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. to achieve the best results for the affected cat.
Causes
- Glomerulonephritis or Glomerulopathie.
- Systemic diseases such as diabetes mellitus or infections.
- ToxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. damage to the kidneys.
Symptoms
The symptoms of nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in cats can be subtle and develop gradually, making early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. difficult. A common sign is the development of edemaAn edema is a buildup of fluid in the body’s tissues, leading to Swelling. Edema can be localized or generalized and is often a sign of an underlying condition., which is swelling caused by the accumulation of fluid in the tissues. These often appear in the cat’s abdominalThe term “abdominal” refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. area, legs, or face.
Furthermore, affected cats may suffer from weight loss, even if they show normal or even increased food intake. The loss of albuminalbumin is the most abundant protein in blood plasma and has important functions, such as transporting substances in the blood and maintaining osmotic pressure, which is crucial for the distribution of body fluids., an important proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. in the blood, can lead to a decrease in osmotic pressureOsmotic pressure is the pressure created by the diffusion of water across a semipermeable membrane, driven by differences in solute concentration on either side of the membrane. It plays an important role in the water and electrolyte balance of cells., which in turn promotes the formation of fluid accumulations in the tissues.
Other symptoms may include increased thirst and increased urination, as the kidneys try to compensate for lost proteins through increased urine production. In some cases, proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. loss can lead to a weakened immune systemThe immune system is the body’s defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body., making the cat more susceptible to infections.
Diagnosis
The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in cats usually begins with a thorough medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and a physical examination. The veterinarian will look for specific symptoms and consider the cat’s medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. to identify possible causes for the symptoms.
An important diagnostic step is urinalysis, where the urine is examined for the presence of proteins. An elevated proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. content in the urine, known as proteinuriaProteinuria is the presence of excessive protein in the urine, often indicating kidney dysfunction. It can be an early sign of kidney disease in dogs and cats., is a characteristic sign of nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment.. Additional urine tests can help determine the type and amount of lost proteins.
Blood tests are also crucial for diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. They can provide clues about the cat’s general health and show the degree of proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. loss in the blood. A low albuminalbumin is the most abundant protein in blood plasma and has important functions, such as transporting substances in the blood and maintaining osmotic pressure, which is crucial for the distribution of body fluids. level in the blood is another indicator of nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment..
In some cases, a kidney biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. may be necessary to determine the exact cause of kidney damage. This is an invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. procedure in which a small tissue sample is taken from the kidney and examined under a microscope.
Therapy
The therapy for nephrotic syndrome in cats aims to alleviate symptoms and treat the underlying cause of the disease. One of the most important measures is controlling proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. loss to prevent the formation of edemaAn edema is a buildup of fluid in the body's tissues, leading to Swelling. Edema can be localized or generalized and is often a sign of an underlying condition. and stabilize the cat’s general health.
Dietary changes can play an important role. A protein-rich but balanced diet can help compensate for proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. loss. Special kidney diets that reduce the content of phosphorusPhosphorus is a vital mineral found in bones and teeth, playing a central role in energy metabolism and DNA. A balanced phosphorus to calcium ratio is essential for the health of dogs and cats. and sodium can also be helpful in supporting kidney function and preventing the formation of edemaAn edema is a buildup of fluid in the body's tissues, leading to Swelling. Edema can be localized or generalized and is often a sign of an underlying condition..
Medications can be used to control blood pressure and reduce inflammatory processes in the kidneys. Angiotensin-Converting-Enzyme (ACE) inhibitors are commonly used medications that help lower blood pressure and reduce proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. excretion in the urine. In some cases, steroidsSteroids are a group of lipids that include both hormones and certain medications. In veterinary medicine, steroids are used to treat inflammatory conditions, allergies, and autoimmune diseases in dogs and cats. or other immunosuppressiveImmunosuppressive agents are medications or substances that specifically suppress the activity of the immune system. They are used in dogs and cats to treat autoimmune diseases, allergies, and to prevent rejection reactions after transplants. medications may be necessary to control an overactive immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens..
For cats suffering from infections that cause nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment., targeted antimicrobialAn antimicrobial substance is an agent that serves to inhibit the growth of microorganisms such as bacteria, viruses, fungi, and protozoa, or to kill them. Antimicrobials are frequently used to treat infections. therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. may be necessary. Treating infections and managing co-existing conditions such as diabetes or high blood pressure are also crucial for the success of the therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..
Prognosis and follow-up care
The prognosis for cats with nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. varies greatly and depends on several factors, including the severity of the disease, the underlying cause, and the responsiveness to therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions.. With early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and appropriate therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. can be favorable, and many cats can lead a relatively normal life.
In cases of advanced kidney disease or if the underlying cause cannot be successfully treated, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. may be poorer. In such cases, the disease can become chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. and lead to a progressive deterioration of kidney function.
Regular veterinary check-ups and close monitoring of symptoms are crucial to track the course of the disease and make adjustments to the therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions.. Close collaboration with the veterinarian can help improve the quality of life of the affected cat and minimize potential complications.
Prevention
To minimize the risk of nephrotic syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. in cats, it is important to ensure a balanced diet that is rich in high-quality proteins and contains all necessary nutrients. Regular veterinary examinations can help detect early signs of kidney problems and treat them promptly. It is advisable to monitor the cat’s water intake and ensure it always has access to fresh water to support kidney function.
Furthermore, contact with potentially harmful substances such as poisonous plants, certain medications, or chemicals should be avoided, as these can damage the kidneys. Keep your cat away from areas where it might ingest dangerous substances. Also, ensure that the cat maintains a healthy weight, as overweight can put additional strain on the kidneys.
Finally, it is advisable to minimize stress situations for the cat, as stress can weaken the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. and indirectly impair kidney function. Regular vaccinations and deworming also contribute to your cat’s general health and can reduce the risk of infections that could affect the kidneys. Good care and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. can improve your cat’s general health and help prevent kidney problems.