Keywords: آنتی بادی گلوتامیک اسید دکربوکسیلاز; Stiff-person syndrome; Glutamic acid decarboxylase antibody; Autoimmune disease; SPS; Stiff Person Syndrome; GABA; Gamma Amino Butyric Acid; ACS; Acute Coronary Syndrome; GAD; Glutamic Acid Decarboxylase; IVIG; Intravenous Immunoglobulins;