Myopathies are a general category of muscle disorder that may either be inherited (genetic) or acquired (inflammatory, metabolic, toxic, or endocrine-related). There are various types and severity of symptoms that are treated depending on their underlying cause. Here’s a structured overview:
Determine the type of underlying
Inflammatory myopathies (e.g., polymyositi, dermatomyositis, inclusion body myositis)
There is no cure as yet; treatment is concerned with:
Corticosteroids (in Duchenne muscular dystrophy) in order to delay progression.
Gene therapy & exon skipping drugs (under development in Duchenne and others).
Nurturing: physiotherapy, aids.
Supportive Measures & Lifestyle Measures
Physiotherapy & occupational therapy - remain mobile and independent.
Speech/swallow therapy- when the swallowing muscles are weak.
Respiratory support - non-invasive ventilation in the advanced cases.
Nutritional support -dietary needs to avoid malnutrition and muscle wasting.
Frequent check-up- heart, lungs, muscle activity.
Myopathies symptoms
Myopathies are diseases that affect the muscles primarily, and cause weakness and other systemic complications. The symptoms differ depending on the nature of the myopathy (inherited (genetic) or acquired (inflammatory, metabolic, endocrine or drug-induced)) but share some common features.
General Symptoms of the Myopathies
Weakness of the muscle (that is the most obvious symptom)
Typically it is proximal muscles first (hips, thighs, shoulders, upper arms).
The inability to climb up or down stairs, to stand up or get out of a chair, to pick something up, or to hairdress.
The muscle pains or cramps (myalgia), in particular, post-exercise.
Weakness and loss of exercise capacity.
Atrophy (muscle wasting) of long-term or genetic myopathies.
Stiffness or contractures (tightening and lack of flexibility of the muscles).
Swallowing (dysphagia) may be difficult in case of affected throat muscles.
Difficulty breathing when the respiratory muscles are involved.
Abnormal stepping (waddling, tiptoe walking).
Inherited myopathies treatment
Muscular dystrophies, congenital myopathies, mitochondrial myopathies, metabolic myopathies, and channelopathies, all of which are inherited myopathies (also known as genetic myopathies).
Most inherited myopathies are not fully curable since they have genetic defects and therefore treatment aims at slowing down, managing complications and enhancing quality of life.
General Management of Inherited Myopathies
Symptom management > be strong, mobile, functional.
Prevention of complications→ defend heart, lungs, bones, and joints.
Supportive care → nutrition, respiratory support, physical rehabilitation.
Specific treatments (when it is only possible, and may sometimes be experimental).
Avoid known precipitants (e.g. potassium-rich foods in hyperkalemic periodic paralysis).
Metabolic myopathies therapy
Metabolic myopathies are a cluster of hereditary muscle disorders that occur due to energy metabolism defects (an inability to breakdown glycogen, an inability to oxidize fatty acids, or a failure to produce energy in a mitochondrion). Since underlying enzyme defects are genetic, a full cure is often not possible - but treatment is adapted to the metabolic defect responsible to minimize symptoms and crisis.
General Goals of Therapy
Avoid muscle breakdown (rhabdomyolysis).
Lessen exercise intolerance, cramps and fatigue.
Have sufficient power to muscles.
Prevent metabolic crisis (fasting, illness or vigorous exercise).
Supplementation with carnitine (in primary carnitine deficiency, but not in long-chain fatty acid oxidation disorders where carnitine supplementation may exacerbate the symptoms).
Mitochondrial Myopathies
Physical therapy (aerobic exercise has the power to enhance the efficiency of mitochondria).
Arginine (in case of stroke-like episode related to MELAS)
Do not use mitochondrial-toxic drugs (valproic acid, aminoglycosides, certain anaesthetics).
Inflammatory myopathies treatment
Autoimmune muscle diseases are inflammatory myopathies which include polymyositis (PM), dermatomyositis (DM), necrotizing autoimmune myopathy (NAM), and inclusion body myositis (IBM).
The treatment is primarily aimed at the immune suppression, preservation of muscle functioning and management of complications.
Intravenous Immunoglobulin (IVIG) -effective in dermatomyositis and in a few refractory cases.
Rituximab - helpful in resistant PM, DM, and NAM.
Other biologics (phase III): Tocilizumab, Abatacept.
Inclusion Body Myositis (IBM)
Frequently immune to conventional immunosuppressive treatment.
Give attention to rehabilitation, physiotherapy, assistive devices.
There are some who have been helpful with IVIG (primarily with swallowing difficulties).
Disease-modifying drugs are in clinical trial.
Myopathies specialist doctors
Dr. Sumeet Agrawal
Dr. Rajiva Gupta
Myopathies treatment in India with GetWellGo
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