Fig. 2

Unadjusted survival plot of infants who had PDA ligations performed in the NICU. No further mortalities were documented beyond 70 days in either group. All-cause mortality has decreased dramatically since the 1980’s when the mortality rate at 1 month post-procedure was quoted as 18–26% in premature infants who had their PDA ligations in the OR [2], and overall mortality of 38% in neonates who had PDA ligations done in the NICU