['Transvenous ventricular pacing leads across the tricuspid valve may cause or exacerbate tricuspid regurgitation (TR). The literature in adults is inconclusive and no studies have investigated the association between pacing leads and TR in children or congenital heart disease patients.', "A retrospective chart review was conducted at a large children's hospital, yielding 123 patients with initial placement of a transvenous lead across their tricuspid valve that had adequate echocardiographic data for review. The median age was 16 years (range 2-52) at time of lead placement. The pre-procedure echo was compared both to the first echo after lead placement and the most recent echo. Median time was 242 days from implant to first echo, and 827 days to most recent echo. There was no difference in TR between the pre-procedure echo and first follow-up echo (p = NS). However, TR was more likely to progress mildly between the pre-procedure echo and the most recent echo (p < 0.02) with a mean increase from 1.54 to 1.69 on a 0 to 4 ordinal scale. There were 76 pts (62%) with CHD. Mean pre-procedure TR was 1.82 in right-sided valvular CHD (e.g., tetralogy of Fallot, repaired AV canal) vs. 1.43 without right-sided CHD (p < 0.01)."] Does impact of transvenous ventricular pacing lead on tricuspid regurgitation in pediatric and congenital heart disease patients?