Effect of blue LED phototherapy centered at 478 nm versus 459 nm in hyperbilirubinemic neonates: a randomized study

Treatment of choice for hyperbilirubinemic neonates is blue light matching the absorption spectrum of bilirubin-albumin in vitro with maximum absorption at 459 nm. Blue LED light centered at 478 nm was hypothesized as being more efficient than that centered at 459 nm. This study compares the bilirubin-reducing effect of the two light qualities with equal irradiance in a randomized nonblinded clinical trial.

Inclusion criteria were healthy hyperbilirubinemic neonates with gestational age ≥33 weeks. Forty-nine neonates included in each group received phototherapy from above for 24 h. Mean irradiances were 9.2 × 10¹⁵ and 9.0 × 10¹⁵ photons/cm²/s for the 478 and 459 nm groups, respectively.

Mean [95% CI] decreases in total serum bilirubin were 150 [141, 158] and 120 [111, 130] µmol/L for the 478 and 459 nm groups, respectively; mean difference was 29 [17, 42] µmol/L. Mean [95% CI] percentage decreases in bilirubin were 54.8% [52.5, 57.0] and 41.8% [39.3, 44.3]; mean difference was 12.9 [9.6, 16.3] percentage points. After adjustment this difference was 13.4 [10.2, 16.7] percentage points. All differences were highly statistically significant (P < 0.001).

Blue LED light centered at 478 nm had a greater bilirubin-reducing effect than that centered at 459 nm with equal irradiance quantified as photon fluence rate.

Blue LED light centered at 478 nm had a greater in vivo bilirubin-reducing effect than blue LED light centered at 459 nm with equal irradiance quantified as photon fluence rate in the treatment of hyperbilirubinemic late preterm or term neonates. LED light centered at 478 nm might reduce the duration of phototherapy compared to LED light centered at 459 nm as the same effect can be obtained while exposing the infants to fewer photons. Blue light matching the absorption spectrum of the bilirubin-albumin complex in vitro with peak absorption at 459 nm is used worldwide as it is considered to be the most effective light for phototherapy of jaundiced neonates. This study showed that blue LED light centered at 478 nm had a greater bilirubin-reducing effect than blue LED light centered at 459 nm. Therefore, blue LED light centered at 478 nm should be used instead of blue light centered at 459 nm. By this, the risk of potential side effects might be minimized, and the duration of phototherapy potentially reduced.