More than 50% of arrhythmia-management devices implanted today include a right atrial lead. While the structure of the right ventricle and its apex ensures an easy implantation procedure of even the simplest straight-pacing lead, the structure of the atrium is less friendly, necessitating the use of special shapes and fixation mechanisms to stabilize the lead. Despite major advances over the years in technology and design and a major decrease in complication rates, the use of atrial leads still carries a somewhat higher rate of complications, including infections and dislodgements. 1 Given this relative difficulty with atrial lead implantation and the variety of commercially available leads, it is important that the choice of lead be based on knowledge and understanding of the available data on success rate, complications, and performance of the various available atrial leads, as well as on personal experience and preferences. So far, approaches vary widely among different implanters.When selecting a lead, the following variables should be considered: lead shape (J vs straight), size, fixation mechanisms (passive vs active as well as different mechanisms of active fixation), and long-term performance.In the current issue of PACE, Zoppo et al. 2 published a retrospective nonrandomized shortterm comparison of the use of straight screw-in leads in the atrium in comparison with either passive (which formed the majority) or active "J"-shaped leads. They reported a remarkable lack of any dislodgement over the first three months in a group of 165 patients with straight atrial leads, as compared to higher dislodgement rates of about 2% in passive as well as active "J" leads. The rate of other complications, including pericardial complications, was very low in all three groups. Implant thresholds were somewhat higher in active fixation leads as compared with the passive leads. There was no long-term followup of either complications or pacing thresholds.Our somewhat different experience will be reviewed here and will include key evidence in the literature for each one of several factors involved in the selection of a lead:Shape of the lead: One of the features that enables stable localization of the lead in the right atrial appendage is a preformed "J" shape that maintains the tip in an upright position against the appendage or the right atrial wall. "J"-shaped leads may have either an active or a passive fixation mechanism, as opposed to straight leads that are used in the atrium, almost all of which have active fixation to prevent dislodgement. Therefore, the main issue to be examined when choosing a straight versus J atrial lead is its stability and threshold over time (both macro dislocation and stability of thresholds over time).In contrast to the study of Zoppo et al., our experience in a large-retrospective series of more than 500 patients implanted with a J-shaped passive lead showed a less than 1% rate of any complication, including dislodgement. Long-term performance of these leads was also excellent. 3 This diff...