The arginine growth hormone stimulation test in bradykinetic‐rigid parkinsonisms
Identifieur interne : 001151 ( Istex/Checkpoint ); précédent : 001150; suivant : 001152The arginine growth hormone stimulation test in bradykinetic‐rigid parkinsonisms
Auteurs : Maria Teresa Pellecchia [Italie] ; Katia Longo [Italie] ; Michela Manfredi [Italie] ; Claudio Lucetti [Italie] ; Giovanni Cossu [Italie] ; Alfredo Petrone [Italie] ; Roberto Marconi [Italie] ; Mariachiara Sensi [Italie] ; Antonio Epifanio [Italie] ; Roberto Eleopra [Italie] ; Roberta Marchese [Italie] ; Tomaso Scaravilli [Italie] ; Letterio Morgante [Italie] ; Giovanni Abbruzzese [Italie] ; Ubaldo Bonuccelli [Italie] ; Edoardo Donati [Italie] ; Rosario Pivonello [Italie] ; Annamaria Colao [Italie] ; Paolo Barone [Italie]Source :
- Movement Disorders [ 0885-3185 ] ; 2008-01-30.
English descriptors
Abstract
The arginine growth hormone (GH) stimulation test differentiates the Parkinsonian variant of multiple system atrophy (MSA‐P) from idiopathic Parkinson's disease (PD). Our aim was to evaluate the accuracy of the arginine GH stimulation test in distinguishing between PSP, MSA‐P, and PD. We measured the GH response to arginine in serum samples of 26 MSA‐P, 23 PSP, and 26 PD patients, and in 80 healthy controls. We used ANOVA followed by the Bonferroni test to compare GH values and peaks among groups. We used receiver operating characteristic curve analysis to establish the arginine cut‐off level that best differentiated between MSA‐P, PSP, and PD. The GH peak was significantly lower (P < 0.01) in MSA‐P (1.46 ± 0.29 μg/L) than in both PD (8.74 ± 0.98 μg/L) and PSP (6.64 ± 0.82 μg/L) patients, and controls (8.59 ± 0.44 μg/L). Growth hormone peaked later in PSP patients than in PD patients and controls. At a cut‐off level of 4 μg/L, arginine test distinguished MSA‐P from PD with a sensitivity of 92% and a specificity of 96%, and MSA‐P from PSP with a sensitivity of 78% and a specificity of 96%. The GH response to arginine differentiates MSA‐P from PD and PSP with a good diagnostic accuracy. The neuroendocrine response to arginine of PSP patients differed from that of MSA‐P patients, but was not identical to that of normal controls and PD patients. Our results suggest that the impairment of the central mechanisms modulating GH release differs between PSP and MSA‐P. © 2007 Movement Disorder Society
Url:
DOI: 10.1002/mds.21700
Affiliations:
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>arginine test</term>
<term>growth hormone</term>
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<front><div type="abstract" xml:lang="en">The arginine growth hormone (GH) stimulation test differentiates the Parkinsonian variant of multiple system atrophy (MSA‐P) from idiopathic Parkinson's disease (PD). Our aim was to evaluate the accuracy of the arginine GH stimulation test in distinguishing between PSP, MSA‐P, and PD. We measured the GH response to arginine in serum samples of 26 MSA‐P, 23 PSP, and 26 PD patients, and in 80 healthy controls. We used ANOVA followed by the Bonferroni test to compare GH values and peaks among groups. We used receiver operating characteristic curve analysis to establish the arginine cut‐off level that best differentiated between MSA‐P, PSP, and PD. The GH peak was significantly lower (P < 0.01) in MSA‐P (1.46 ± 0.29 μg/L) than in both PD (8.74 ± 0.98 μg/L) and PSP (6.64 ± 0.82 μg/L) patients, and controls (8.59 ± 0.44 μg/L). Growth hormone peaked later in PSP patients than in PD patients and controls. At a cut‐off level of 4 μg/L, arginine test distinguished MSA‐P from PD with a sensitivity of 92% and a specificity of 96%, and MSA‐P from PSP with a sensitivity of 78% and a specificity of 96%. The GH response to arginine differentiates MSA‐P from PD and PSP with a good diagnostic accuracy. The neuroendocrine response to arginine of PSP patients differed from that of MSA‐P patients, but was not identical to that of normal controls and PD patients. Our results suggest that the impairment of the central mechanisms modulating GH release differs between PSP and MSA‐P. © 2007 Movement Disorder Society</div>
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<tree><country name="Italie"><noRegion><name sortKey="Pellecchia, Maria Teresa" sort="Pellecchia, Maria Teresa" uniqKey="Pellecchia M" first="Maria Teresa" last="Pellecchia">Maria Teresa Pellecchia</name>
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