Immune-Mediated Polyarthritis, IMPA (Inflammatory Condition of Multiple Joints) in Dogs
- Occurrence: very rare
- Location of illness: General/Whole body, Legs
Immune-mediated polyarthritis (IMPA) in dogs is an inflammatory condition in which the animal’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. attacks multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. joints, leading to Pain, Swelling, and limited mobility.
The most important facts at a glance
Immune-mediated polyarthritis (IMPA) is an autoimmune disease in dogs 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 and inflames the joints. The exact cause is unclear, but genetic factors and certain dog breeds appear to be predisposed. IMPA can occur primarily without other underlying conditions or secondarily due to infections, medications, or vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases. reactions. Hormonal and environmental influences such as 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. can also influence the disease.
Symptoms of IMPA include Fever, joint Swelling, Pain, stiff gait, and Lameness. 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 clinical examinations, blood tests, X-rays, and joint fluid analysis. These tests help to rule out other causes and identify the inflammation. Treatment aims to reduce inflammation and relieve Pain. 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. (NSAIDsNSAID (non-steroidal anti-inflammatory drug) stands for non-steroidal anti-inflammatory drugs, a class of medications used to relieve pain, reduce inflammatory conditions, and lower fever without using steroidal agents. They are a commonly used pain reliever in veterinary medicine.) and immunosuppressants such as prednisone or azathioprine are commonly used. Complementary therapies such as 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 dietary supplements can support recovery.
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. Many dogs achieve a good quality of life, especially 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.. However, 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. problems and permanent joint damage are possible. Regular veterinary follow-up is crucial to monitor the course of the disease and adjust 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.. Since the cause of IMPA is not fully understood, there are no specific preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measures. However, a balanced diet, regular examinations, and careful monitoring after vaccinations or medication administration can be helpful.
Causes
IMPA belongs to a group 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. in which the body’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. attacks its own cells or tissues. In IMPA, the joints are affected, leading to inflammation. The exact mechanism as to why 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. considers the joints foreign and attacks them is not yet fully understood. Scientists suspect that genetic predispositions play a role, as certain dog breeds are more frequently affected.
The disease can occur primarily without other underlying conditions, or secondarily in connection with other systemic diseases, infections, or as a reaction to medications. Secondary forms of IMPA can be triggered by infections such as Lyme disease, or even by vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases. reactions.
Hormonal and environmental influences can also play a role. For example, hormonal changes in non-neutered female dogs can cause an exacerbation of symptoms. Environmental factors such as 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. or other diseases can increase the risk of developing IMPA.
Symptoms
The symptoms of IMPA can vary from dog to dog, but typically include Lameness and Pain in multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. joints. This Lameness can migrate, meaning it can switch between different legs.
Affected dogs often show an aversion to exercise, are lethargic, and may show signs of Fever. The joints may be swollen and warm to the touch. In some cases, there may be general malaise and loss of appetite, indicating the systemic nature of the disease.
Additionally, joint noises or creaking may occur during movements, and in advanced cases, there may be a significant restriction of joint mobility, which greatly affects the dog’s everyday life.
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 IMPA requires a comprehensive clinical examination and consideration of the dog’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.. A veterinarian will often perform a combination of blood tests, X-rays of the affected joints, and, if necessary, a joint fluid analysis.
Analysis of the joint fluid can reveal elevated white blood cells and signs of inflammation, suggesting an immune-mediated cause. Blood tests can help rule out other causes and assess the animal’s general health.
In some cases, further tests such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or computed tomography (CT)Computed tomography (CT) is an imaging technique that uses X-rays and computer technology to create cross-sectional images of the body. It enables a detailed view of bones, organs, and other structures and is used for the diagnosis of injuries, diseases, and for planning medical interventions. may be necessary to rule out other conditions that could cause similar symptoms. An accurate 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 crucial to initiate 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..
Therapy
The treatment of IMPA aims to reduce inflammation and relieve Pain in order to improve the dog’s quality of life. 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. (NSAIDsNSAID (non-steroidal anti-inflammatory drug) stands for non-steroidal anti-inflammatory drugs, a class of medications used to relieve pain, reduce inflammatory conditions, and lower fever without using steroidal agents. They are a commonly used pain reliever in veterinary medicine.) are often used to control inflammation and Pain.
In many cases, however, 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. or immunosuppressants are needed to dampen 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.. Medications such as prednisone or azathioprine may be prescribed to suppress 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 control the inflammatory response.
Complementary therapies such as 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., acupuncture, or the use of dietary supplements such as omega-3 fatty acids can also be helpful in supporting joint health and further alleviating symptoms.
Prognosis and follow-up care
The prognosis for dogs with IMPA varies depending on the severity of the disease, the response to treatment, and the presence of concomitant diseases. Many dogs respond well to treatment and can achieve a good quality of life, especially if the disease is diagnosed and treated early.
However, some dogs may develop chronic problems that require long-term treatment. In rare cases, IMPA can lead to permanent joint damage that impairs the dog’s mobility.
Regular follow-up by the veterinarian is crucial to monitor the course of the disease and adjust 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. if necessary. Owners should be prepared that treatment may be required for life to prevent relapses.
Prevention
Since the exact cause of IMPA is not fully understood, there are no specific measures to prevent the disease. Nevertheless, some general measures can help to reduce the risk.
A balanced diet and a healthy lifestyle can support the dog’s general health and 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.. Regular veterinary examinations can help to detect early signs of the disease and treat it in time.
Since some medications or vaccinations are considered triggers for secondary forms of IMPA, these should only be administered after consultation with a veterinarian and when medically necessary. Careful monitoring after vaccinations or medication administration can help detect early signs of a reaction.
When to visit the vet?
Urgent see a veterinarian within 24 hours
If the condition worsens / symptoms persist, consult a veterinarian.