The dynamics of brain concentrations of phenylalanine and its clinical significance in patients with phenylketonuria determined by in vivo 1H magnetic resonance spectroscopy.

Abstract:

:Cerebral concentrations of phenylalanine (PHE) were measured by means of quantitative in vivo 1H MR spectroscopy in 8 adult patients treated early for phenylketonuria type I. A 1.5-Tesla routine magnetic resonance scanner, localization sequence with short echo time (20 ms), and a fully automated data processing scheme were used. Baseline plasma PHE concentrations were 1.04 (0.70-1.39) mmol/L PHE with concurrent brain PHE concentrations of 0.27 (0.13-0.41) mmol/kg of wet weight resulting in a plasma/brain ratio of 4.12. Plasma and brain concentrations correlated significantly (Kendall tau b = 0.91, p < 0.01). During an oral load with a single dose of 100 mg L-PHE per kg of body weight in four patients, plasma levels steeply increased. Concurrent brain PHE increase was less steep, was significantly delayed, and still continued up to 20 h postload. Despite the proven rise in plasma and brain concentrations of PHE, neuropsychologic examinations revealed no impairment of attentional and fine motor abilities from preload up to 20 h postload.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Pietz J,Kreis R,Boesch C,Penzien J,Rating D,Herschkowitz N

doi

10.1203/00006450-199511000-00005

subject

Has Abstract

pub_date

1995-11-01 00:00:00

pages

657-63

issue

5

eissn

0031-3998

issn

1530-0447

journal_volume

38

pub_type

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