Coexistence of Systemic Lupus Erythematosus and Myasthenia Gravis: An Unusual Case of Polyautoimmunity.

The relevance of polyautoimmunity, defined as the presence of 2or more autoimmune diseases in the same individual, is one of the issues not yet elucidated in medical practice. The coexistence of myasthenia gravis (MG) and systemic lupus erythematosus (SLE) is a clinical challenge due to the possible differential diagnoses of muscle involvement in patients with SLE. We present the case of a patient who came to the emergency room of Hospital Universitario San Ignacio in Bogotá, Colombia, with a previous diagnosis of SLE, who developed acute weakness in the context of a systemic infection, with a clinical and electrophysiological diagnosis of MG.

[Colombian Guidelines of clinical practice for the use of immunoglobulins in the treatment of replacement and immunomodulation].

Immunoglobulins are heterodimeric proteins composed of 2 heavy chains and 2 light chains. Human immunoglobulin G (IgG) is a plasma derivative and contains more than 95% of IgG. The composition of IgG subclasses is similar to that of normal human plasma.

Antisynthetase antibody syndrome: case report and review of the literature.

Antisynthetase antibody syndrome is a rare autoimmune disease that may present with variable systemic manifestations, mainly polymyositis, interstitial lung disease, skin lesions, and Raynaud's phenomenon. This diagnosis should always come to mind in patients that present with signs of myositis, dermatomyositis, or polymyositis associated with interstitial lung disease. On the following paper, we report the case of a 52-year-old man who presented with a 2-month history of asymmetric polyarthralgia, myalgia, weight loss of 8 kg, and progressive muscle weakness associated with dyspnea, orthopnea, and dysphonia.