Abstract:
:The mechanism underlying the motor fluctuations that develop after long-term L-dopa therapy is not fully known. It has been speculated that malabsorption of L-dopa from the small intestine occurs. It was reported that gastric retention in Parkinson's disease (PD) patients with motor fluctuations is increased as compared with that in PD without fluctuations. Because L-dopa therapy may worsen the symptoms of delayed gastric emptying (GE), it was not clear whether the delayed GE of PD patients with motor fluctuation was affected by L-dopa therapy. We assessed GE in PD patients with and without motor fluctuations. We investigated GE in 40 patients with PD under long-term L-dopa therapy, 20 fluctuators with "delayed-on" and "noon" phenomena, 20 nonfluctuators, and 20 healthy volunteers. GE was examined by the 13C-acetate breath test ((13)CABT) [the half emptying time (HET), the peak time of the (13)C-%-dose-excess curve (T(max))], with expirations collected for 4 h after a test meal and analyzed for (13)CO(2) using an infrared (IR) spectrophotometer. The T(max) of GE as assessed using the (13)C-ABT was significantly delayed in all PD patients as compared with controls (P = 0.002). The HET was significantly delayed in all PD patients as compared with controls (P < 0.001). The T(max) and HET were not significantly delayed in PD patients with motor fluctuations as compared with PD patients without motor fluctuations. These results demonstrated that GE is commonly delayed in PD patients with long-term L-dopa therapy. Delayed GE does not differ between PD patients with and without motor fluctuations. This finding demonstrated that the motor fluctuation in PD may not be influenced by GE.
journal_name
J Neuroljournal_title
Journal of neurologyauthors
Tanaka Y,Kato T,Nishida H,Araki H,Murase M,Nagaki M,Moriwaki H,Inuzuka Tdoi
10.1007/s00415-009-5220-5subject
Has Abstractpub_date
2009-12-01 00:00:00pages
1972-6issue
12eissn
0340-5354issn
1432-1459journal_volume
256pub_type
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