Polymyositis

Updated: July 26, 2024

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Background

Polymyositis is an inflammatory disorder ending in the loss of muscle strength and the general inflammation throughout the body. This disease is categorized as autoimmune disease which in turn refers to damage and weakness leading unintentionally from the immune system of the body which is attacking wrongly on its own muscle. Atrophy of specific muscle groups is seen with progressive muscle weakness being a characteristic feature of polymyositis most commonly involving muscles around the waist and central part of the body namely the ones in the upper arms thighs or hips and shoulders. Everyday activities such as lifting products climbing stairs and getting out of chair might appear like challenging task to those who suffer this weakness. The feature of polymyositis is myositis which includes the inflammation of muscles. This can be expressed by the symptoms of soreness discomfort and swelling. Both the blood tests that can detect the changes in the amount of muscle enzymes when injured muscle tissues are releasing these enzymes into the bloodstream and tests that measure the muscle enzymes levels are useful for identifying the inflammation.

Epidemiology

Men are twice as likely to have inclusion body myositis although women are more likely to develop polymyositis and dermatomyositis. Polymyositis often affects adults over the age of 20 especially those in their 40s to 60s. Polymyositis seldom rarely children. The age at which polymyositis with extra collagen vascular disease initially appears is related to the associated disorder.

Anatomy

Pathophysiology

Polymyositis is a type of autoimmune illness that is recognized when immune system deliberately the body’s own tissue. One of the

distinctive features of this disease is the inappropriate biological response to some components of the muscle-bone tissues. This will show up as a proliferating T lymphocyte population and macrophage population that are self-reactive and actively target muscle tissue. These genetic variables most likely contribute significantly to polymyositis in its early phases in vulnerable people.

Etiology

Since polymyositis is an autoimmune disease it is characterised by an abnormal immune response which occurs when the body’s immune system mistakenly attacks its own muscle tissue. Immune checkpoints and cytokine signalling pathways may be dysregulated in polymyositis leading to the collapse of immunological tolerance and the onset of autoimmunity.

Genetics

Prognostic Factors

The prognosis will depend on certain factors like age, severity of initial symptoms and extent of muscle involvement.

Clinical History

Age group:

Although polymyositis may affect anyone of any age persons between the ages of 30 and 60 are the ones who typically experience it. Adult cases of polymyositis usually follow a bimodal distribution with a peak in cases seen in people over 60 and another in those between 30 and 50 years of age.

Physical Examination

The following parameters are assessed in physical assessment:

Muscle Strength

Muscle Bulk

Range of Motion

Age group

Associated comorbidity

Associated activity

Acuity of presentation

The symptoms of polymyositis sometimes appear slowly over weeks or months with an insidious beginning in many patients. Patients may first experience mild symptoms including weariness muscular weakness and trouble doing tasks that call for strength, such lifting goods or climbing stairs. Some people may have a subacute start of symptoms which progresses more quickly over a few weeks and is characterised by tiredness and muscular weakness.

Differential Diagnoses

Dermatomyositis

Inclusion Body Myositis

Viral Myositis

Metabolic Myopathies

Laboratory Studies

Imaging Studies

Procedures

Histologic Findings

Staging

Treatment Paradigm

Intravenous immunoglobulin therapy (IVIG): Infusions of purified antibodies produced from human plasma are used in this form of immunoglobulin therapy.

Biologic medications: Rituximab and Tocilizumab are two examples of biologic medications that target immune system components implicated in the pathogenesis of polymyositis.

Physical Therapy: By assisting in the preservation of muscular strength enhancing range of motion and averting problems including muscle contractures and joint stiffness physical therapy is essential in the care of polymyositis.

Symptomatic Management: To address related issues such dysphagia, interstitial lung disease and heart involvement symptomatic therapy may be required.

by Stage

by Modality

Chemotherapy

Radiation Therapy

Surgical Interventions

Hormone Therapy

Immunotherapy

Hyperthermia

Photodynamic Therapy

Stem Cell Transplant

Targeted Therapy

Palliative Care

use-of-non-pharmacological-approach-for-polymyositis

Physical Environment: Make sure your home is both accessible and safe. Control humidity and temperature: Polymyositis attacks may get worse under the effect of high or low humidity or temperature, and this is a well-known fact. Diet and Nutrition: Promote a diet that is well balanced and make fruit and vegetables or whole grains or lean meat and water predomination is common practice for people to help. Exercise and Physical Activity: Encourage daily exercise and physical activity as this is an individual-oriented attribute that suits everyone depending on their capabilities and preferences.

Role of Corticosteroids in treating polymyositis

Prednisone

It suppresses the abnormal immune response that underlies the inflammation and muscle damage in polymyositis.

Effectiveness of Immunosuppressants in treating polymyositis

Methotrexate

Methotrexate is a DMARD also known as a steroid-sparing agent which is commonly prescribed in the treatment of polymyositis.

Azathioprine

Azathioprine is an Immunosuppressive drug that appears as an adjunct corticosteroids in the maintenance of Polymyositis.

use-of-intervention-with-a-procedure-in-treating-polymyositis

Muscle Biopsy: To examine if PM is present a muscle biopsy performed in order to what extent the inflammation and muscle damage is. Electromyography: This is a medical diagnostic technique that involves the skin surface measurements of the conductivity to determines the level of electrical activity between the muscles and the nerves. Tests of Lung Function: The assessment points of these tasks by healthcare suppliers are intended for the determining lung status of the patients and interstitial lung disease etc.

use-of-management-in-polymyositis

Initial Assessment and Diagnosis: The first step in the management procedure is identifying signs of polymyositis such as weakness in the muscles & exhaustion and trouble doing everyday tasks. Symptom Management: To address related symptoms including dysphagia joint discomfort or respiratory issues symptomatic therapy may be given.

Monitoring: To evaluate treatment response, modify therapy as necessary and identify illness flares or problems routine monitoring of disease activity laboratory parameters and drug side effects is crucial throughout the maintenance period.

Medication

Media Gallary

References

Polymyositis – StatPearls – NCBI Bookshelf (nih.gov)

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Polymyositis

Updated : July 26, 2024

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Polymyositis is an inflammatory disorder ending in the loss of muscle strength and the general inflammation throughout the body. This disease is categorized as autoimmune disease which in turn refers to damage and weakness leading unintentionally from the immune system of the body which is attacking wrongly on its own muscle. Atrophy of specific muscle groups is seen with progressive muscle weakness being a characteristic feature of polymyositis most commonly involving muscles around the waist and central part of the body namely the ones in the upper arms thighs or hips and shoulders. Everyday activities such as lifting products climbing stairs and getting out of chair might appear like challenging task to those who suffer this weakness. The feature of polymyositis is myositis which includes the inflammation of muscles. This can be expressed by the symptoms of soreness discomfort and swelling. Both the blood tests that can detect the changes in the amount of muscle enzymes when injured muscle tissues are releasing these enzymes into the bloodstream and tests that measure the muscle enzymes levels are useful for identifying the inflammation.

Men are twice as likely to have inclusion body myositis although women are more likely to develop polymyositis and dermatomyositis. Polymyositis often affects adults over the age of 20 especially those in their 40s to 60s. Polymyositis seldom rarely children. The age at which polymyositis with extra collagen vascular disease initially appears is related to the associated disorder.

Polymyositis is a type of autoimmune illness that is recognized when immune system deliberately the body’s own tissue. One of the

distinctive features of this disease is the inappropriate biological response to some components of the muscle-bone tissues. This will show up as a proliferating T lymphocyte population and macrophage population that are self-reactive and actively target muscle tissue. These genetic variables most likely contribute significantly to polymyositis in its early phases in vulnerable people.

Since polymyositis is an autoimmune disease it is characterised by an abnormal immune response which occurs when the body’s immune system mistakenly attacks its own muscle tissue. Immune checkpoints and cytokine signalling pathways may be dysregulated in polymyositis leading to the collapse of immunological tolerance and the onset of autoimmunity.

The prognosis will depend on certain factors like age, severity of initial symptoms and extent of muscle involvement.

Age group:

Although polymyositis may affect anyone of any age persons between the ages of 30 and 60 are the ones who typically experience it. Adult cases of polymyositis usually follow a bimodal distribution with a peak in cases seen in people over 60 and another in those between 30 and 50 years of age.

The following parameters are assessed in physical assessment:

Muscle Strength

Muscle Bulk

Range of Motion

The symptoms of polymyositis sometimes appear slowly over weeks or months with an insidious beginning in many patients. Patients may first experience mild symptoms including weariness muscular weakness and trouble doing tasks that call for strength, such lifting goods or climbing stairs. Some people may have a subacute start of symptoms which progresses more quickly over a few weeks and is characterised by tiredness and muscular weakness.

Dermatomyositis

Inclusion Body Myositis

Viral Myositis

Metabolic Myopathies

Intravenous immunoglobulin therapy (IVIG): Infusions of purified antibodies produced from human plasma are used in this form of immunoglobulin therapy.

Biologic medications: Rituximab and Tocilizumab are two examples of biologic medications that target immune system components implicated in the pathogenesis of polymyositis.

Physical Therapy: By assisting in the preservation of muscular strength enhancing range of motion and averting problems including muscle contractures and joint stiffness physical therapy is essential in the care of polymyositis.

Symptomatic Management: To address related issues such dysphagia, interstitial lung disease and heart involvement symptomatic therapy may be required.

Rheumatology

Physical Environment: Make sure your home is both accessible and safe. Control humidity and temperature: Polymyositis attacks may get worse under the effect of high or low humidity or temperature, and this is a well-known fact. Diet and Nutrition: Promote a diet that is well balanced and make fruit and vegetables or whole grains or lean meat and water predomination is common practice for people to help. Exercise and Physical Activity: Encourage daily exercise and physical activity as this is an individual-oriented attribute that suits everyone depending on their capabilities and preferences.

Rheumatology

Prednisone

It suppresses the abnormal immune response that underlies the inflammation and muscle damage in polymyositis.

Rheumatology

Methotrexate

Methotrexate is a DMARD also known as a steroid-sparing agent which is commonly prescribed in the treatment of polymyositis.

Azathioprine

Azathioprine is an Immunosuppressive drug that appears as an adjunct corticosteroids in the maintenance of Polymyositis.

Rheumatology

Muscle Biopsy: To examine if PM is present a muscle biopsy performed in order to what extent the inflammation and muscle damage is. Electromyography: This is a medical diagnostic technique that involves the skin surface measurements of the conductivity to determines the level of electrical activity between the muscles and the nerves. Tests of Lung Function: The assessment points of these tasks by healthcare suppliers are intended for the determining lung status of the patients and interstitial lung disease etc.

Rheumatology

Initial Assessment and Diagnosis: The first step in the management procedure is identifying signs of polymyositis such as weakness in the muscles & exhaustion and trouble doing everyday tasks. Symptom Management: To address related symptoms including dysphagia joint discomfort or respiratory issues symptomatic therapy may be given.

Monitoring: To evaluate treatment response, modify therapy as necessary and identify illness flares or problems routine monitoring of disease activity laboratory parameters and drug side effects is crucial throughout the maintenance period.

Polymyositis – StatPearls – NCBI Bookshelf (nih.gov)

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