87 results
Idiopathic Inflammatory Myopathies - 
Dermatomyositis (DM), Immune-Mediated Necrotizing Myopathy (IMNM), Antisynthetase Syndrome (ASS), Inclusion Body Myositis
Idiopathic Inflammatory Myopathies ... - Dermatomyositis ... Immune-Mediated Necrotizing Myopathy ... Antisynthetase Syndrome ... #Idiopathic #Myopathy
Statin Induced Muscle Toxicity - Summary

Clinical Presentation:
 • Elevations of serum creatine kinase with proximal myalgia
• Inflammatory myopathy ... hypothyroid-induced myopathy ... polymyositis, dermatomyositis ... Statin-induced myopathy ... - Necrotizing myopathy
Myositis Specific Antibodies (MSAs)

Dermatomyositis: MDA5, TIF1y, NXP2, Mi-2, SAE
Anti-Synthetase Syndrome: Jo-1, PL7, PL12, EJ, OJ
Immune Mediated
Antibodies (MSAs) Dermatomyositis ... Anti-Synthetase Syndrome ... Mediated Necrotizing Myopathy
Autoimmune Myositis
Necrotizing myopathy is associated with higher CK levels, greater level of muscle weakness, less systemic
Myositis Necrotizing myopathy ... Dermatomyositis ... anti-synthetase syndrome ... and anti-HMGCR myopathy
Causes of Neuromuscular Weakness
 • Spinal Cord: Demyelinating Disease (MS), Epidural abscess, Infarction, Syringomyelia, Tetanus, Transverse
Guillain-Barre syndrome ... Lambert Eaton Syndrome ... Mitochondrial myopathy ... , Polymyositis/dermatomyositis
Weakness - Differential Diagnosis Framework

Approach To Weakness:
 • Non-neuromuscular disorder (Cardiac, pulmonary etc)
 • CNS ->
• Acute stroke syndromes ... Paraneoplastic syndrome ... proximal weakness Myopathy ... mediated necrotizing myopathy ... Muscle Biopsy: Dermatomyositis
Autoimmune Myositis - Differential Diagnosis Framework

Inflammatory Myopathies: Commonly symmetric proximal muscle weakness, no substantial muscle pain
Antisynthetase syndrome ... NECROTIZING AUTOIMMUNE MYOPATHY ... • If myopathy ... ANTI-MITOCHONDRIAL MYOPATHY ... Autoimmune #Myositis #Myopathy
Causes of Peripheral Weakness without Sensory Changes - Differential Diagnosis Algorithm
No Objective Weakness
 • Cardio-pulmonary disease
Lambert-Eaton Myasthenic Syndrome ... • Congenital Myopathy ... Statin Toxicity • Dermatomyositis
Myositis and Myopathies
#ESR #CK #Differential diagnosis of myopathy 
#Inflammatory #myopathies	#Dermatomyositis	
#muscle weakness
#Polymyositis	
#Inclusion body myositis
#Polymyalgia rheumatica	
#Fibromyalgia	
#Hypothyroid myopathy	
#Muscle stiffness
#Drug-induced
Differential diagnosis of myopathy ... #Dermatomyositis ... #Hypothyroid myopathy ... Statin-induced myopathy ... Cocaine-induced myopathy
Myositis and Myopathies
Polymyositis 
 • Progressive, symmetric muscle weakness 
 • Elevated CK, +Anti-Jo, +Anti-Mi2
Dermatomyositis
Anti-Jo, +Anti-Mi2 Dermatomyositis ... load Drug-induced myopathy ... Gemcitabine Lupus Myopathy ... 5-15% of lupus myopathy ... #myopathy #differential