Linked Life Data

448554

Source:http://linkedlifedata.com/resource/pubmed/id/448554

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1979-8-16
pubmed:abstractText
Plasma concentrations of theophylline and caffeine in seven premature neonates receiving theophylline orally for treatment of apnea at age one to 9 days were measured by high performance liquid chromatography, ultraviolet spectrophotometry, and mass spectrometry. Plasma concentrations of caffeine increased from 1.8 mg/l (range = 0.1 to 3.7) at day one to 3.7 mg/l (1.3 to 8.0) seven days after initiation of theophylline therapy. Similarly, plasma concentrations of theophylline were 4.6 mg/l (1.5 to 7.5) and 11.0 mg/l (4.0 to 19.0) on days one and 7 of theophylline therapy, respectively. In contrast, four normal adult volunteers given theophylline orally for eight to ten days had plasma theophylline concentrations ranging from 3 to 14 mg/l but no measurable caffeine. This indicates that caffeine is a biotransformation product of theophylline in premature neonates and that the metabolic pathway followed by theophylline in premature infants includes a methylation reaction producing caffeine, whereas in adults, the major metabolic pathway involves oxidative reactions (demethylation and oxidation). Some pharmacologic effects attributed to theophylline during chronic therapy for apnea may in part be due to caffeine. Routine monitoring during theophylline therapy in premature neonates with apnea should include plasma concentrations of both theophylline and caffeine in order to assess the total methylxanthine load.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0022-3476
pubmed:author
pubmed:issnType
Print
pubmed:volume
94
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
988-93
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1979
pubmed:articleTitle
Metabolism of theophylline to caffeine in premature newborn infants.
pubmed:publicationType
Journal Article, Comparative Study