Abstract Background Supraventricular tachycardia (SVT) is a common arrhythmia in pediatric patients. Emerging evidence suggests a link between systemic inflammation and cardiovascular diseases. Objectives This study aims to investigate the relationship between the monocyte/lymphocyte ratio (MLR) and neutrophil/lymphocyte ratio (NLR) with SVT in pediatric patients. Methods: We conducted a retrospective study at Rize Education and Research Hospital’s Pediatric Health and Diseases Department, including 33 patients diagnosed with SVT and 33 control subjects without sinus tachycardia. Hemogram (CBC) parameters, electrocardiography (ECG), […]