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Gastroesophageal reflux in premature infants

Authors
Richard Martin, MD
Anna Maria Hibbs, MD, MSCE
Section Editor
Steven A Abrams, MD
Deputy Editor
Alison G Hoppin, MD

INTRODUCTION

Gastroesophageal reflux (GER), the passage of gastric contents into the esophagus, occurs commonly in newborn infants and is especially common in those born prematurely. Physiologic GER typically is a developmental process that resolves with maturation. GER generally resolves on its own by one year of age. In infants who have no symptoms other than regurgitation, no further evaluation or intervention is typically required.

In contrast, gastroesophageal reflux disease (GERD) is clinically significant GER that causes morbidity [1]. Putative morbidities of GERD in preterm infants include frequent vomiting, aspiration pneumonia, irritability, failure to thrive, and exacerbation of respiratory symptoms, including chronic lung disease. However, it is likely that in many infants with these symptoms, the GER is not the underlying cause.

GER in preterm infants will be reviewed here. GER in infants, children, and adolescents are discussed separately. (See "Gastroesophageal reflux in infants" and "Clinical manifestations and diagnosis of gastroesophageal reflux disease in children and adolescents" and "Management of gastroesophageal reflux disease in children and adolescents".)

MECHANISMS

GER is extremely common in healthy infants in whom gastric fluids reflux into the esophagus 30 or more times daily. It appears that GER is more common in healthy preterm compared with term infants. The pathogenesis of GER in preterm infants appears to be multifactorial due in part to immature or impaired anatomic and physiologic factors that typically limit reflux.

Relaxation of lower esophageal sphincter — The most important mechanism of GER in preterm infants (similar to older infants and adults) is transient relaxation of the lower esophageal sphincter (LES) [2,3]. The LES is comprised of intrinsic smooth muscle of the esophagus and skeletal muscle of the crural diaphragm [4].

                              

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Literature review current through: Nov 2016. | This topic last updated: Sat Jul 02 00:00:00 GMT 2016.
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