Persistent mitt crack vena cava (SVC) is an exceptional condition, commonly encountered during cannulisation of the mitt subclavian vein. We exposit a enduring who required a cardiac figure raise to cardiac resynchronization implantable cardioverter defibrillator for biventricular failure. The proximity of a continual mitt SVC evidenced to be a support in hiding in this enduring as he had since matured amount coagulum of the mitt subclavian-innominate system.