title: Plasma beta-endorphin concentration in infants with apneic spells.
abstract: In an attempt to determine whether plasma beta-endorphin (beta-ED) concentrations correlate with occurrence of apnea in preterm infants, measurements were made in three groups of infants. The control group consisted of 11 infants with a mean (+/- SEM) gestational age of 30.5 +/- 0.8 weeks, a mean (+/- SEM) birthweight of 1650 +/- 180 g, and a mean (+/- SEM) postnatal age of 1.3 +/- 0.5 days. Eight infants with apnea, bradycardia, and associated hypotension had a mean (+/- SEM) gestational age, birthweight and postnatal age of 30 +/- 0.9 weeks, 1165 +/- 90 g, and 7.8 +/- 1.9 days, respectively. The third group consisted of eight infants experiencing apnea alone without bradycardia and had a mean (+/- SEM) gestational age, birthweight, and postnatal age of 31 +/- 0.8 weeks, 1380 +/- 125 g, and 2.6 +/- 0.9 days, respectively. The last two groups of infants suffered varying degrees of apnea, but differed in their severity. The plasma endorphin concentrations (+/- SEM) were 26.9 +/- 2, 68.0 +/- 9.0, and 39.6 +/- 2.0 pg/ml, respectively, for the previously described three groups. Significant elevation in beta-ED concentration was observed in the severely apneic infants with bradycardia when compared to the other two groups. The association of increased plasma beta-ED release with severe apneic spells may suggest that these endogenous opiates play a role in the pathophysiology of apnea of prematurity.
mesh_terms: D001049:Apnea / Q000097:blood* / Q000150:complications; D001919:Bradycardia / Q000150:complications; D004723:Endorphins / Q000097:blood*; D006801:Humans; D007022:Hypotension / Q000150:complications; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000097:blood*; D011863:Radioimmunoassay; D012008:Recurrence; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D001615:beta-Endorphin