Computerized Misinterpretation of QT Interval in 12-Lead Electrocardiogram and Its Clinical Consequences: A Case of Recurrent Syncope

The diagnosis of long QT syndrome may be delayed due to absence of electrocardiogram (ECG) examination and/or QT interval misdiagnosis. We present the case of a patient who took 8 years before being diagnosed with long QT syndrome. Despite the presence of marked QT prolongation and bimodal T waves, automated ECG recording misdiagnosed the patient to be normal. The patient had recurrent syncope; however, repeat ECG examination was not performed because her initial ECG was considered normal. It is crucial in cases of syncope that multiple ECG examinations and physician assessment of findings are performed, without relying exclusively on an automated ECG diagnosis. 2. Abbreviations: ECG: Electrocardiogram; QTc: Corrected QT Interval; TdP: Torsades De Pointes 3. Introduction