Non-erosive, Immune-Mediated Polyarthritis (Inflammation of Multiple Joints) in cats
- Occurrence: very rare
- Location of illness: Legs
Non-erosive, immune-mediated polyarthritis (NIPA) in cats is an Inflammatory condition in which 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. attacks the cat’s own joints, leading to Pain and Swelling without destructiveDestruction means “demolition.” In medicine, it refers to the destruction of cells, tissues, organs, or body parts. The growth of malignant Tumors is also usually accompanied by destruction of the surrounding tissue. changes to the joint structure.
The most important facts at a glance
Nonerosive, immune-mediated polyarthritis (NIPA) in cats is an autoimmune disease in which 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. mistakenly attacks the body’s own tissue, leading to Inflammatory conditions and Swelling in the joints without destroying the articular cartilage or bone substance. The exact causes are still unclear, but genetic factors, infections, and 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. may play a role. Common symptoms include Stiffness, Lameness, and Pain in various legs, while the Joints swollen and may be unstable. 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. includes a thorough examination, blood tests, and possibly a joint puncture / arthrocentesisJoint puncture, also known as arthrocentesis, is a procedure in which fluid is removed from a joint using a needle and syringe. This can be done for diagnostic purposes or to relieve a swollen joint. to rule out other conditions. Imaging procedures help to rule out structural changes.
The treatment aims to suppress the 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., often using 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. agents such as corticosteroidsCorticosteroids are a class of steroid hormones that occur naturally in the body and can also be produced synthetically. They have anti-inflammatory and immunosuppressive properties and are used in veterinary medicine to treat a variety of conditions.. Non-steroidalNon-steroidal refers to medications or substances that are not steroids and often have anti-inflammatory, analgesic, or antipyretic effects. They are used in dogs and cats to treat Pain and Inflammatory conditions. anti-inflammatory drugsAnti-inflammatory drugs are medications that reduce inflammation. They can be divided into nonsteroidal anti-inflammatory drugs (NSAIDs) and corticosteroids and are used in dogs and cats to reduce Inflammatory conditions and Pain. can help relieve Pain but require careful monitoring. 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. is usually long-term and requires regular check-ups to monitor the effectiveness and possible side effects. 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. depends on the severity of the disease and the response to treatment, with many cats being able to achieve a good quality of life. Preventive measures focus on 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, a balanced diet, and regular veterinary check-ups.
Causes
Non-erosive polyarthritis in cats belongs to the group of immune-mediated diseases in which 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. mistakenly attacks the body’s own tissues. This condition is called “non-erosive” because, unlike erosive forms of arthritisArthritis is an inflammation of the joints that can cause pain, swelling, stiffness, and limited mobility. There are many forms of arthritis, including rheumatoid arthritis and osteoarthritis. such as rheumatoid arthritisArthritis is an inflammation of the joints that can cause pain, swelling, stiffness, and limited mobility. There are many forms of arthritis, including rheumatoid arthritis and osteoarthritis., it does not cause destructionDestruction means "demolition." In medicine, it refers to the destruction of cells, tissues, organs, or body parts. The growth of malignant Tumors is also usually accompanied by destruction of the surrounding tissue. of joint cartilage or bone substance. Instead, the joint structure remains intact, although Inflammatory conditions and Swelling occur.
Immune-mediated polyarthritides can occur as primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. or secondary. In a primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. form, no underlying disease is identifiable, while the secondary form is associated with other diseases or triggers. In cats, infections, vaccinations, or other autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus. can be considered as triggers for secondary NIPA.
The exact causes of non-erosive, immune-mediated polyarthritis are not yet fully understood. However, it is assumed that genetic factors may play a role, as certain breeds may be more susceptible. Environmental factors, infections, and 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. could also influence the development of the disease.
Symptoms
Symptoms of non-erosive, immune-mediated polyarthritis in cats can be very variable and often develop insidiously. One of the most common symptoms is lameness, which can occur in one or more legs. This lameness can come and go and sometimes changes the affected leg, which is referred to as migrating lameness.
Other signs include swollen and painful joints. The cat may be reluctant to move or jump, and may show general stiffness, especially after getting up or after physical activity. Sometimes only subtle Behavioral changes can be observed, such as reduced activity or reduced play behavior.
In some cases, systemic symptoms such as Fever, loss of appetite, or general Lethargy may also occur. These symptoms are not specific and can occur with various diseases, which can complicate the diagnosis.
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 non-erosive, immune-mediated polyarthritis in cats requires a comprehensive clinical examination and various diagnostic tests. The veterinarian will first take 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. to understand the cat’s illness 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 symptoms.
Blood tests are an important part of 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. and can help identify inflammatory markers in the blood and rule out other possible causes for the symptoms. Specific tests for autoantibodies can be performed to rule out other autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus..
A joint puncture may be necessary to collect and analyze joint fluid. In the non-erosive form of polyarthritis, the joint fluid typically shows an increased number of white blood cells without detectable bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease..
Imaging techniques such as X-rays can be used to rule out structural changes in the joints that should not be present in the non-erosive form. These examinations help to confirm 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. or rule out other diseases.
Therapy
The therapy of non-erosive, immune-mediated polyarthritis in cats primarily consists of suppressing the 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.. 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. drugs are often used for this. CorticosteroidsCorticosteroids are a class of steroid hormones that occur naturally in the body and can also be produced synthetically. They have anti-inflammatory and immunosuppressive properties and are used in veterinary medicine to treat a variety of conditions. such as prednisolone are often the first choice because they act quickly and reduce Inflammation.
In some cases, NSAIDNSAID stands for "Non-Steroidal Anti-Inflammatory Drugs." These medications are used to reduce inflammatory conditions, pain, and fever. In dogs and cats, NSAIDs must be used with caution, as they can have side effects, especially on the gastrointestinal tract and kidneys. (non-steroidalNon-steroidal refers to medications or substances that are not steroids and often have anti-inflammatory, analgesic, or antipyretic effects. They are used in dogs and cats to treat Pain and Inflammatory conditions. anti-inflammatory drugAnti-inflammatory drugs are medications or substances that help reduce or prevent inflammatory responses in the body. They can be divided into nonsteroidal anti-inflammatory drugs (NSAIDs) and steroidal anti-inflammatory drugs (e.g., corticosteroids).) can also be used for Pain relief. Since these medications can have long-term side effects, careful monitoring of the cat is required.
If corticosteroidsCorticosteroids are a class of steroid hormones that occur naturally in the body and can also be produced synthetically. They have anti-inflammatory and immunosuppressive properties and are used in veterinary medicine to treat a variety of conditions. alone are not sufficient or the cat does not respond well to them, 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. drugs such as cyclosporine or azathioprine may be considered. These medications work in different ways to regulate the activity of 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..
Therapy is often required long-term, and it may take some time to find the right combination of medication and dosage for the individual cat. Regular veterinary check-ups are important to monitor 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. and to detect possible side effects early.
Prognosis and follow-up care
The prognosis for cats with non-erosive, immune-mediated polyarthritis depends on various factors, including the severity of the disease, 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., and the presence of co-morbidities. In many cases, the disease can be well controlled with 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., and the cat can maintain a good quality of life.
However, some cats do not respond to treatment or develop side effects from the medications over time. In such cases, it may be necessary to 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. or consider alternative treatment approaches.
Long-term 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. and quality of life also depend on how early 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. is made and how well the disease is brought under control. Cats that are treated early and respond well 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. generally have a better 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..
Prevention
The preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of non-erosive, immune-mediated polyarthritis in cats is a challenge, as the exact causes of the disease are not fully understood and it often occurs without identifiable triggers. Nevertheless, there are some general measures that can reduce the risk of autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus..
A balanced and high-quality diet can strengthen 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 promote the cat’s overall health. It is important that the diet contains all necessary nutrients to keep 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 optimal condition.
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 also plays an important role, as stress can impair the immune response. A stress-free environment with sufficient opportunities for retreat and regular activity can help improve the cat’s well-being.
Regular veterinary examinations are crucial to monitor the cat’s general health and to become aware of possible problems at an early stage. This enables a quick response should a health problem develop.
It is also advisable to pay attention to known allergens and environmental factors that could burden the cat’s 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.. A clean and safe environment helps reduce the risk of infections and other health problems that could 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..
Outlook on current research
Non-erosive, immune-mediated polyarthritis in cats is an exciting field of research that has gained increasing attention in recent years. Scientists are focusing on deciphering the exact immunological mechanisms that lead to the development of this disease. In particular, the role of autoantibodies that attack the body’s own tissues and cause Inflammation in the joints is being investigated. New studies have begun to identify specific biomarkers that could be helpful in the diagnosis and monitoring of the disease.
Another focus of research is on the genetic predisposition that makes cats susceptible to this form of arthritisArthritis is an inflammation of the joints that can cause pain, swelling, stiffness, and limited mobility. There are many forms of arthritis, including rheumatoid arthritis and osteoarthritis.. Researchers analyze genetic profiles of affected cats to identify possible inheritance patterns. These findings could help identify risk groups and develop preventive measures in the future.
Therapeutically, the effectiveness of various immunomodulatorsImmunomodulators are substances that affect the immune system by increasing or decreasing its activity. They are used in dogs and cats to treat autoimmune diseases, allergies, or as cancer therapy. is being tested to control the inflammatory response. Current studies are investigating both traditional medications such as corticosteroidsCorticosteroids are a class of steroid hormones that occur naturally in the body and can also be produced synthetically. They have anti-inflammatory and immunosuppressive properties and are used in veterinary medicine to treat a variety of conditions. and novel therapies that specifically intervene in the immune process. The goal is to develop treatments that are more effective and have fewer side effects to improve the quality of life for affected cats.
Another exciting research approach is the role of nutrition and the microbiome in the development and 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. of non-erosive, immune-mediated polyarthritis. Some studies suggest that certain diets or dietary supplements could have anti-inflammatory properties. The modulation of the gut microbiome also represents a potential 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. approach that is being further investigated.
Overall, research into non-erosive, immune-mediated polyarthritis is still in its early stages, but advances in immunology and geneticsGenetics is the science of genes, heredity, and the variation of organisms. It studies how genetic information is passed from generation to generation and how it influences the development, appearance, and behavior of living things. offer hope for improved 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 treatment options. The exchange between scientists and veterinarians is being intensified to transfer research results into practice more quickly and promote the well-being of animals.
Frequently asked questions (FAQs)
- What is non-erosive, immune-mediated polyarthritis in cats? This disease is a form of arthritis affecting multiple joints. It is triggered by the cat’s 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., which mistakenly attacks healthy tissue without destroying the joints themselves.
- How does the disease manifest itself in cats? Affected cats often show symptoms such as lameness, Stiffness, Swelling of the joints, and sometimes also Fever. The symptoms can occur in episodes and vary in their intensity.
- What causes this form of arthritisArthritis is an inflammation of the joints that can cause pain, swelling, stiffness, and limited mobility. There are many forms of arthritis, including rheumatoid arthritis and osteoarthritis.? The exact causes are not yet fully understood, but genetic factors and dysregulation of 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. are believed to play a role. Infections or other environmental factors could also be triggers.
- How is the disease diagnosed? Diagnosis is made through a combination of clinical examination, blood tests, X-rays, and sometimes joint fluid analysis. It is important to rule out other forms of arthritisArthritis is an inflammation of the joints that can cause pain, swelling, stiffness, and limited mobility. There are many forms of arthritis, including rheumatoid arthritis and osteoarthritis. and joint diseases.
- What treatment options are there? 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. usually includes anti-inflammatory medications and immunomodulatorsImmunomodulators are substances that affect the immune system by increasing or decreasing its activity. They are used in dogs and cats to treat autoimmune diseases, allergies, or as cancer therapy.. In some cases, physiotherapyVeterinary physiotherapy encompasses a range of treatment methods aimed at improving the mobility and well-being of animals through exercise, massage, and other manual techniques. and special diets can also be supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease.. 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. is individually adapted to the cat.
- Can the disease be cured? A cure for non-erosive, immune-mediated polyarthritis is currently not possible. The treatment aims to control the symptoms and improve the cat’s quality of life.
- Are there risk factors that increase the likelihood of developing the disease? Certain breeds might be genetically predisposed, and age can also be a factor. Cats with a compromised 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. or 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. infections may have a higher risk.
- How can I support my cat if it suffers from this disease? Close cooperation with the veterinarian is crucial. Stick to the treatment plan and ensure an environment that promotes your cat’s mobility. Regular check-ups are important to monitor the course of the disease.
- What progress is being made in research? Current research focuses on genetic predispositions, new diagnostic markers, and innovative treatment methods. The goal is to better understand the disease and develop more effective 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. approaches.
- Can the cat’s diet have an impact on the disease? Yes, certain diets and supplements may have anti-inflammatory effects. A balanced diet supports general health and can be part of a comprehensive treatment plan.
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.