title: Skin reflectance changes in preterm infants with patent ductus arteriosus.
abstract: BACKGROUND
  Patent ductus arteriosus (PDA) is a common complication in preterm infants. While two-dimensional echocardiography is the method of choice for diagnosing a PDA, clinical signs are known to be of limited value.
  
  
  METHODS
  Haemodynamically significant PDA (hs-PDA) was defined as a ductal left-to-right shunt with elevated left atrial/aortic root ratio ( > 1.6:1), a ductal diameter > 2 mm, retrograde diastolic flow exceeding 30% of the anterograde flow and anterograde peak diastolic flow velocity in left pulmonary artery > 50 cm/s. A hs-PDA may affect the cerebral circulation and skin color is known to be related to local perfusion. In this study, we tested the value of a caudal-to-cephalic skin reflectance differential in detecting preterm infants with hs-PDA. The study was blinded and prospective.
  
  
  METHODS
  Fifteen infants with a hs-PDA (M: 8, F: 7; gestational age: 28.0 +/- 2.0 weeks, birth weight: 880 +/- 130 g) and 15 gender- and gestational age-matched infants without a haemodynamically significant PDA (M: 8, F: 7; gestational age: 28.2 +/- 2.3 weeks, birth weight: 885 +/- 135 g) participated to the study.
  
  
  METHODS
  Skin reflectance measurements were performed using a reflectance spectrophotometer (CM-2600d/2500d, Minolta, Osaka, Japan). Sole ("postductal" site) to forehead ("preductal" site) skin reflectance ratio (caudal-to-cephalic ratio).
  
  
  RESULTS
  hs-PDA infants showed significantly lower forehead light reflectance values on for the whole visible spectrum (p < or = 0.043) with the exception of 580-590 nm (p = 0.058), whereas no statistically significant differences were observed for the sole skin reflectance between the two groups in the examined visible spectrum. Consequently, hs-PDA infants showed a significantly higher caudal to cephalic ratio in the 410-430 nm (p < or = 0.042), 460-530 nm (p < or = 0.027) and 590-700 nm (p < or = 0.011) wavelength ranges.
  
  
  CONCLUSIONS
  These findings may provide a previously unrecognised clinical marker for haemodynamically significant PDA in preterm infants, thus predicting those preterm infants who may require intervention for PDA.
authors.affiliation: Neonatal Intensive Care Unit, Azienda Ospedaliera Universitaria Senese, Policlinico Le Scotte, Viale M. Bracci 16, Siena I-53100, Italy. defelice.claudio@libero.it
authors.forename: Claudio
authors.initials: C
authors.lastname: De Felice
authors.forename: Serena
authors.initials: S
authors.lastname: Mazzieri
authors.forename: Michele
authors.initials: M
authors.lastname: Pellegrino
authors.forename: Alessia
authors.initials: A
authors.lastname: Del Pasqua
authors.forename: Paolo
authors.initials: P
authors.lastname: Toti
authors.forename: Franco
authors.initials: F
authors.lastname: Bagnoli
authors.forename: Enrico
authors.initials: E
authors.lastname: Rosati
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Latini
mesh_terms: D001783:Blood Flow Velocity; D004374:Ductus Arteriosus, Patent / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D006439:Hemodynamics; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D007235:Infant, Premature, Diseases / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D012867:Skin / Q000503:physiopathology*; D013053:Spectrophotometry