Central apnoea and endogenous prostaglandins in neonates.
OBJECTIVE
Central apnoeas without an identifiable precipitating cause frequently occur in the neonatal period. Serious apnoeas should be treated with ventilation-enhancing methylxanthines. Drugs such as opioids or prostaglandins (PGE2) are known to induce apnoea. PGE2 is an endogenous hormone that plays an important role in the regulation of neural activity and a relationship between PGE2 and central apnoeas has been postulated.


METHODS
In order to test the hypothesis that the incidence of central apnoeas in preterm infants is related to endogenous PGE concentration, we measured the urinary concentration of PGE2 and PGE-M and determined the number of central apnoeas >10 s/12 h in overnight polygraphy in 18 preterm infants with apnoeas, bradycardias and desaturations, and 18 normal controls.


RESULTS
We found 80.6 (SE 6.9) central apnoeas in the study group, and 52.9 (SE 4.1) in the control group (p = 0.002). Urinary PGE2 concentration was 25.9 (SE 6.1) ng/h/1.73 m2 in the control, 31.2 (SE 15.8) ng/h/1.73 m2 in the study group (p = n.s.), PGE-M concentration was 486 (SE 35) ng/h/1.73 m2 in the control and 1132 (SE 131) ng/h/1.73 m2 in the study group (p < 0.0001). There was a significant correlation between the number of central apnoeas and the PGE-M concentration in the study group (r = 0.68, p < 0.0001).


CONCLUSIONS
Our results suggest a relationship between PGE and the respiratory system and open potential therapeutic options for the treatment of central apnoeas in neonates.
Hoch
B
B
Department of Paediatrics, Philipps-University of Marburg, Germany.
Bernhard
M
M
D001049:Apnea / Q000209:etiology / Q000503:physiopathology* / Q000652:urine; D001919:Bradycardia / Q000209:etiology / Q000503:physiopathology; D002849:Chromatography, Gas; D003627:Data Interpretation, Statistical; D015232:Dinoprostone / Q000652:urine; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate; D006801:Humans; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000209:etiology / Q000503:physiopathology* / Q000652:urine; D008297:Male; D013058:Mass Spectrometry; D010092:Oximetry; D010100:Oxygen / Q000097:blood; D010991:Plethysmography; D017286:Polysomnography; D011453:Prostaglandins / Q000502:physiology* / Q000652:urine; D013997:Time Factors
D011453:Prostaglandins; C060526:7-hydroxy-5,11-dioxotetranorprostane-1,16-dioic acid; D015232:Dinoprostone; D010100:Oxygen