Helifix, an electrode suitable for transvenous atrial and ventricular implantation.

The Helifix endocardial fixation lead can be screwed in between the trabeculae of the right ventricle or the right atrial appendage. The lead was used for ventricular stimulation in 30 patients. In seven of them, the Helifix electrode was used because of dislocation of other leads and in eight patients because acceptable threshold levels could not be obtained with other electrodes. In six patients the Helifix lead had to be inserted in the proximal part of the right ventricle and in one patient in the outflow tract. One patient required replacement of the Helifix lead after 6 weeks because of an excessive threshold rise. There was only one instance of electrode dislodgment (1 hour after implantation) in the 30 patients. In 20 patients the Helifix lead was implanted in the right atrial appendage with the aid of a new double stylet. There was no instance of electrode dislodgment or any other complications in the 20 patients. The Helifix lead is therefore recommended as an atrial electrode. This lead is also suitable in patients with frequent dislocations and for better fixation to other parts of the right ventricle than the apex.