Figure 1.

Colored illustrations of the original drawings of the first cardioplegic arrest operation. A, Illustration of the ventricular septal defect and cannulation via the left subclavian artery for cardiopulmonary bypass and venous drainage. B, Illustration of injection of potassium solution with the aorta crossclamped. C, Right ventriculotomy and closed ventricular septal defect. All images are reproduced with permission from Effler and colleagues.⁴ Copyright 2021 The Cleveland Clinic Foundation. All rights reserved.