Resumen

STECHER M, Juan F; PAVLOVIC B, Milenko; CONTRERAS V, Cristian  y  CARVAJAL C, Jorge. Prematuros tardíos: estudio clínico retrospectivo de sus causas y consecuencias. Rev. chil. obstet. ginecol. [online]. 2015, vol.80, n.3, pp.221-228. ISSN 0717-7526.  http://dx.doi.org/10.4067/S0717-75262015000300004.

Background: Children born between 34 0/7 and 36 6/7 weeks of gestation are called late-preterm infants. Represent 5 to 7% of live births and they are at higher risk of morbidity and mortality than term infants. Objective: To analyze causes of late preterm births in our institution. To compare neonatal morbidity in late-preterm and term infants. Methods: A retrospective cohort study. Birth records between January 2009 and December 2012 were reviewed identifying live births between 34 0/7 and 36 6/7 and between 39 0/6 and 40 6/7 weeks of gestation. Clinical group of preterm labor to which they belong was identified. Frequency of perinatal outcomes of late-preterm and term infants were compared. Results: In the period under study there were 8890 live birth. The late-preterm birth rate was 7.49% (n = 666); 64.11% of them was idiopathic in cause or associated with rupture of membranes and 35.89% was for medical indication. In the group of medical indications 19.25% of the interruptions were not based on evidence and none were purely elective. Late-preterm infants have higher risk of hospitalization and neonatal morbidity than term infants; this risk is higher at earlier gestational ages. Conclusions: In our hospital 1 in 5 late-preterm birth could have been born at higher gestational age, preventing perinatal risks. It is suggested that health institutions analyze causes of interruption of pregnancy in the late-preterm group, which could constitute an indicator of obstetric quality.

Palabras clave : Late preterm; morbidity; iatrogenic premature birth; epidemiology.

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