Therapy of polymyositis and dermatomyositis

Intravenous Immunoglobulin for Inflammatory Myositis: Experience in a Tertiary Medical Center

INTRODUCTION

Inflammatory myopathies are treated with glucocorticoids and other immunosuppressive medications. Intravenous immunoglobulin (IVIG) is increasingly used for refractory or severe cases; however, the evidence for their effectiveness is limited. We assessed effectiveness and safety of IVIG when used with other immunomodulatory agents in the treatment of inflammatory myopathies.

METHODS

This study reviewed records of patients diagnosed with dermatomyositis or polymyositis and treated with IVIG, from 2009 through 2016 in 1 tertiary medical center. Mixed-effects general linear regression models were applied to determine effectiveness of treatment on muscle strength, creatinine phosphokinase levels, and steroid dosage.

RESULTS

Twenty-three patients with dermatomyositis/polymyositis treated with IVIG were followed up for a mean of 31 (SD, ±25) months. During this period, a significant improvement in muscle strength was demonstrated, with a mean increase of 0.92 Medical Research Council scale points (β = 0.14; confidence interval [CI], 0.136-0.149; p < 0.0001), a significant reduction of creatinine phosphokinase levels and steroid dosage with a mean decrease of 1140 IU/L (β = -0.274; CI, -0.354 to -0.195; p < 0.0001), and 36 mg/d (β = -0.008; CI, -0.011 to -0.006; p < 0.0001), respectively. Overall, remission was observed in 10 patients (43.5%), and partial remission in 6 patients (26%), whereas 1 patient (17%) remained refractory to treatment, and 6 patients (27%) were lost to follow-up.

CONCLUSIONS

The majority of patients with inflammatory myopathies experienced a clinical and laboratory improvement during IVIG treatment. In addition, a steroid-sparing effect was noticed in most patients. These results encourage the use of IVIG as an alternative treatment option for patients with limited responsiveness to conventional methods.

Polymyositis and dermatomyositis - challenges in diagnosis and management

Polymyositis (PM) and dermatomyositis (DM) are different disease subtypes of idiopathic inflammatory myopathies (IIMs). The main clinical features of PM and DM include progressive symmetric, predominantly proximal muscle weakness. Laboratory findings include elevated creatine kinase (CK), autoantibodies in serum, and inflammatory infiltrates in muscle biopsy. Dermatomyositis can also involve a characteristic skin rash. Both polymyositis and dermatomyositis can present with extramuscular involvement. The causative factor is agnogenic activation of immune system, leading to immunologic attacks on muscle fibers and endomysial capillaries. The treatment of choice is immunosuppression. PM and DM can be distinguished from other IIMs and myopathies by thorough history, physical examinations and laboratory evaluation and adherence to specific and up-to-date diagnosis criteria and classification standards. Treatment is based on correct diagnosis of these conditions.

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Challenges of diagnosis and management influences the clinical research and practice of Polymyositis and dermatomyositis.

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Diagnostic criteria have been updated and novel therapies have been developed in PM/DM.

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Pathogenesis investigation and diagnosis precision improvement may help to guide future treatment strategies.

Three cases of anti-TNF induced myositis and literature review

Anti-tumor necrosis factor drugs are frequently preferred in the treatment of rheumatologic diseases and other inflammatory diseases. The development of myositis after using anti-tumor necrosis factor drugs is a rare clinical condition. Here we aimed to report cases who developed myositis after using anti-tumor necrosis factor drugs and review the current literature. We report two cases of rheumatoid arthritis and a case of ankylosing spondylitis developed idiopathic inflammatory myopathy following anti-tumor necrosis factor therapy. In conclusion, myositis could develop during anti-tumor necrosis factor therapy, so these patients should be evaluated carefully initially for myositis and should be closely monitored due to the potential for developing myositis in treatment process.

Three cases of anti-TNF induced myositis and literature review

Anti-tumor necrosis factor (anti-TNF) drugs are frequently preferred in the treatment of rheumatologic diseases and other inflammatory diseases. The development of myositis after using anti-TNF is a rare clinical condition. Here we aimed to report cases who developed myositis after using anti-TNF and review the current literature. We report two cases of rheumatoid arthritis (RA) and a case of ankylosing spondylitis (AS) developed idiopathic inflammatory myopathy following anti-TNF therapy. In conclusion, myositis could develop during anti-TNF therapy, so these patients should be evaluated carefully initially for myositis and should be closely monitored due to the potential for developing myositis in treatment process.

Therapeutic Plasma Exchange in Patients with Neurologic Disorders: Review of 63 Cases

Therapeutic plasma exchange (TPE) is a procedure that reduces circulating autoantibodies of the patients. TPE is commonly used in neurological disorders where autoimmunity plays a major role. We report our experience with regard to the indications, adverse events and outcomes of plasma exchange in neurological disorders. Sixty-three patients were included to this retrospective study. Median age was 48 years (range 1-85), there was a predominance of males. Neurological indications included Guillain-Barrè syndrome (n = 22), myasthenia gravis (n = 21), chronic inflammatory demyelinating polyneuropathy (n = 7), polymyositis (n = 3), multifocal motor neuropathy (n = 2), acute disseminated encephalomyelitis (n = 2), neuromyelitis optica (n = 2), multiple sclerosis (n = 2), limbic encephalitis (n = 1) and transverse myelitis (n = 1). TPE was frontline therapy in 57 % of the patients (n = 36). Total number of TPE sessions was 517; median number of sessions per patient was 8 (range 1-66). TPE was done through a central venous access in 97 % and through a peripheral venous access in 3 % of the patients. Human albumin was used as replacement fluid in 49 %, hydroxyethyl starch (HES) in 49 % and fresh frozen plasma in 2 % of the cases. Adverse reactions were recorded in 60 % of the patients. Total ratio of complications in 517 TPE procedures was 10.8 % and these were mild and manageable such as allergic reactions and hypotension. Overall response rate was 81 %. Interestingly, complication and response rates were similar in both HES and human albumin groups. We conclude that TPE is an effective treatment in neurologic diseases in which autoimmunity plays an important role in the pathogenesis and HES can be used instead of albumin as replacement fluid in these disorders, since it is cost-effective, has similar efficacy and complication rates.

Combination therapy of traditional Chinese medicine and Western medicine to treat refractory polymyositis: a case report

OBJECTIVE

To illustrate the potential for clinical improvement and regimen decrement in treating a patient with a refractory case of polymyositis (PM) with a combination of Western medicine and traditional Chinese medicine (TCM).

INTERVENTIONS AND OUTCOME MEASURES

A 40-year-old man diagnosed with steroid-resistant PM in January 2011 demonstrated a poor response to immunosuppressants. Complementary TCM treatments were applied to treat his weakness at a clinic integrating TCM and rheumatology in February 2012. He was treated with herbal formula powders named "Bu-Zhong-Yi-Qi-Tang" and "Si-Jun-Zi-Tan." Within 1 month of treatment, the patient seemed to show significant improvement in the grade of disability. Daily doses of methotrexate and methylprednisolone were tapered to 25% and 95.8% after TCM treatments, respectively. Creatine phosphokinase also decreased from 6655 to 718 U/L until December 2013.

CONCLUSIONS

In our experience, weakness related to PM can be improved by invigorating the spleen-Qi with TCM treatments. This might indicate that TCM treatments can not only play a role in symptom control but also accelerate steroid tapping for refractory cases. Long-term follow-up and future experimental studies are warranted to examine the efficacy and explore the mechanism of TCM treatments for PM.

The efficacy of calcineurin inhibitors for the treatment of interstitial lung disease associated with polymyositis/dermatomyositis

Interstitial lung disease (ILD) in patients with polymyositis (PM) and dermatomyositis (DM) is often resistant to treatment and life threatening, being recognized as one of the severest complication in these autoimmune disorders. Patients with clinically amyopathic dermatomyositis (CADM) or those with anti-CADM140/MDA5 antibody are especially prone to develop rapidly progressive interstitial pneumonia. We retrospectively analyzed 46 patients with PM/DM admitted to our hospital and identified DM, rapidly progressive disease, honeycomb lung, CADM and extensive ILD as risk factors for recurrence or death. In the presence of two or more risk factors, the sensitivity and specificity for the prediction of death or relapse were 81.3% and 76.7%, respectively. Calcineurin inhibitors have been widely used as induction and maintenance therapy for PM/DM-associated ILD. Recently we reported the benefit of tacrolimus on the disease-free survival and event-free survival of the patients with PM/DM-associated ILD. Among those patients treated with tacrolimus, poor prognostic factors for death, recurrence or severe adverse event were identified as acute progression of the disease, honeycomb lung, forced vital capacity (FVC) less than 80% and having DM. The potential effectiveness of an intensive therapy protocol with triple therapy that comprises high-dose corticosteroids, calcineurin inhibitors and cyclophosphamide has been reported.

[Severe dysphagia and erythrodermia in a 59-year-old man]

A 59-year-old man presented with a history of dysphagia and generalized myalgia and muscle weakness and a rash on the face, neck, and upper arms. Serum muscle enzymes, myoglobin, C-reactive protein, and erythrocyte sedimentation rate were elevated and antinuclear antibodies positive. Electromyographic conduction studies showed pathological changes on arm and leg muscles and magnetic resonance imaging of the oral and neck muscles. A diagnosis of dermatomyositis with severe esophageal involvement was established. Treatment with prednisolone was started and methotrexate added. Enteral feeding with a percutaneous endoscopic gastrostomy was started and a therapy with intravenous immunoglobulin (IVIG) initiated, which caused a rapid improvement of the patient's ability to swallow. This case demonstrates a patient with polymyositis/dermatomyositis who showed steroid-resistant life-threatening esophageal impairment. IVIG resulted in a dramatic improvement of symptoms.

The Use of Methotrexate in Dermatology / Upotreba metotreksata u dermatologiji

Methotrexate is a cytotoxic antimetabolite agent and a folic acid antagonist. Except for its use in oncology and rheumatology, it is widely used in dermatology. The most important indications include severe forms of psoriasis, but also a wide range of autoimmune diseases and dermatoses with different etiology and pathophysiology such as: bullous pemphigoid, dermatomyositis, pityriasis rubra pilaris, sarcoidosis, T-cell lymphomas, Behcet’s disease, adult atopic eczema, scleroderma, Reiter’s syndrome and many others. For dermatological indications methotrexate is usually taken in low oral doses, 5-25 mg once a week. In certain diseases it can be applied to the lesion itself, or in the form of local preparations. Considering the fact that numerous drugs affect various metabolic phases of methotrexate and may increase its toxicity, it is of utmost importance to consider other prescribed drugs, especially certain antibiotics, nonsteroidal antiinflammatory drugs, antiepileptic drugs, retinoids, proton pump inhibitors and so on. If the selection of patients is correct, if drugs are taken regularly and laboratory monitoring is included, methotrexate is a truly efficient and safe drug that can be taken for months or years if necessary.

Stepwise approach to myopathy in systemic disease

Muscle diseases can constitute a large variety of both acquired and hereditary disorders. Myopathies in systemic disease results from several different disease processes including endocrine, inflammatory, paraneoplastic, infectious, drug- and toxin-induced, critical illness myopathy, metabolic, and myopathies with other systemic disorders. Patients with systemic myopathies often present acutely or sub acutely. On the other hand, familial myopathies or dystrophies generally present in a chronic fashion with exceptions of metabolic myopathies where symptoms on occasion can be precipitated acutely. Most of the inflammatory myopathies can have a chance association with malignant lesions; the incidence appears to be specifically increased only in patients with dermatomyositis. In dealing with myopathies associated with systemic illnesses, the focus will be on the acquired causes. Management is beyond the scope of this chapter. Prognosis is based upon the underlying cause and, most of the time, carries a good prognosis. In order to approach a patient with suspected myopathy from systemic disease, a stepwise approach is utilized.