SARS-CoV-2-induced myopathy: Clinical aspects, paraclinical changes, and therapeutic options

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has made a considerable global effect, posing notable challenges for clinicians, the pandemic becoming one of the most imperative international health emergencies lately. Among other more frequent manifestations, SARS-CoV-2 disease may also give rise to skeletal muscle involvement. Viral-induced skeletal muscle involvement is a potentially severe manifestation of COVID-19 (Coronavirus Disease 2019) and may be either acute, or in the context of “long-COVID”. The present review aimed to illustrate few aspects about pathomechanisms, clinical and paraclinical frames, and treatment options for SARS-CoV-2-induced muscle involvement. Notably, it has been stated that SARS-CoV-2 may have the ability to invade muscle myocytes directly, the disease having a variety of clinical manifestations, from myalgia and muscle weakness to rhabdomyolysis. Nevertheless, it is also important to take into account that most of patients with severe forms receiving mechanical ventilation for more than one week may have complications such as CIM (critical illness myopathy) and/or CIP (critical illness polyneuropathy) that may be clinically similar to SARS-CoV-2-induced myositis, yet may be differentiated paraclinically from it. Additionally, it was hypothesized that SARS-CoV-2 infection may constitute a trigger for autoimmune diseases such as polymyositis/ dermatomyositis. Presently, there are no diagnosis criteria and no specific therapeutic strategy for SARS-CoV-2-induced myositis.