[Necessity of endocardial lead removal in device upgrade in a patient with left subclavian vein occlusion - a case report].

We describe a method of regaining venous access to the heart in a patient with permanent atrial stimulation, in whom the pacing system upgrade to the atrio-ventricular one was necessary. However, left subclavian vein occlusion was found. We used an existing lead as a conduit. During such treatment the lead was removed. After a recanalisation the therapeutic aim was achieved - there were two new leads implanted.