Abstract:
OBJECTIVE:To measure changes in psychometric state, neural activation, brain volume (BV), and cerebral metabolite concentrations during treatment of minimal hepatic encephalopathy. METHODS:As proof of principle, 22 patients with well-compensated, biopsy-proven cirrhosis of differing etiology and previous minimal hepatic encephalopathy were treated with oral l-ornithine l-aspartate for 4 weeks. Baseline and 4-week clinical review, blood chemistry, and psychometric evaluation (Psychometric Hepatic Encephalopathy Score and Cognitive Drug Research Score) were performed. Whole-brain volumetric and functional MRI was conducted using a highly simplistic visuomotor task, together with proton magnetic resonance spectroscopy of the basal ganglia. Treatment-related changes in regional BV and neural activation change (blood oxygenation level dependent) were assessed. RESULTS:Although there was no change in clinical, biochemical state, basal ganglia magnetic resonance spectroscopy, or in regional BV, there were significant improvements in Cognitive Drug Research Score (+1.2, p = 0.003) and Psychometric Hepatic Encephalopathy Score (+1.5, p = 0.003) with treatment. This cognitive amelioration was accompanied by changes in blood oxygenation level-dependent activation in the posterior cingulate and ventral medial prefrontal cortex, 2 regions that form part of the brain's structural and metabolic core. In addition, there was evidence of greater visual cortex activation. CONCLUSIONS:These structurally interconnected regions all showed increased function after successful encephalopathy treatment. Because no regional change in BV was observed, this implies that mechanisms unrelated to astrocyte volume regulation were involved in the significant improvement in cognitive performance.
journal_name
Neurologyjournal_title
Neurologyauthors
McPhail MJ,Leech R,Grover VP,Fitzpatrick JA,Dhanjal NS,Crossey MM,Pflugrad H,Saxby BK,Wesnes K,Dresner MA,Waldman AD,Thomas HC,Taylor-Robinson SDdoi
10.1212/WNL.0b013e31828726e1subject
Has Abstractpub_date
2013-03-12 00:00:00pages
1041-7issue
11eissn
0028-3878issn
1526-632Xpii
WNL.0b013e31828726e1journal_volume
80pub_type
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