A retrospective analysis of 727 consecutive patients undergoing transcatheter aortic valve replacement (TAVR) found that living in neighborhoods with high single-parent household density increased one-year mortality risk by 165% compared to more stable neighborhoods (hazard ratio 2.65). While overall social deprivation indices showed no significant association with long-term survival, this specific marker of social fragmentation emerged as a powerful predictor. This finding illuminates a critical but underexplored dimension of cardiovascular outcomes: the role of community social structure in recovery from major cardiac interventions. TAVR, a minimally invasive procedure replacing diseased aortic valves, has revolutionized treatment for elderly patients previously deemed too high-risk for surgery. However, the procedure's success depends heavily on post-operative care, medication adherence, and social support networks. The study's identification of single-parent household density as a mortality predictor suggests that neighborhood-level social cohesion may be as important as traditional clinical risk factors. Notably, 85% of patients came from less deprived areas, highlighting persistent access disparities. As this is a preprint awaiting peer review, these provocative findings require validation in larger, more diverse cohorts before influencing clinical practice or healthcare policy.