External Cardioversion of Supraventricular Tachycardia in Omphalo-Thoracopagus Conjoined Twins

A pair of omphalo-thoracopagus twins was diagnosed with supraventricular tachycardia (SVT) on the first day of life. Twelve-lead electrocardiography was performed with leads placed on twin A ([Figure 1][1]). The 2:1 ratio of the 2 QRS populations was thought to be the result of SVT in twin A, with