Objective: To determine if there is a relationship between restricted upper-lip frenums (upper lip ties) and unexpected and unexplained asphyxia (UUA) in infants.
Methods: A retrospective review was done of 327 UUA cases from Miami-Dade County, FL and Harris County, TX. Using autopsy photos, upper-lip frenums were classified by degree of restriction. Statistical analysis was done to compare the occurrence of restricted upper-lip frenums in this UUA population to a baseline for the general population. The difference was statistically significant at the 99% confidence level.
Conclusion: There is a very strong statistical correlation between restricted upper-lip frenums and UUA infant deaths.
Leslie A Haller and Theodore Brown