Is clonidine growth hormone stimulation a good test to differentiate multiple system atrophy from idiopathic Parkinson's disease?
Identifieur interne : 001246 ( PubMed/Curation ); précédent : 001245; suivant : 001247Is clonidine growth hormone stimulation a good test to differentiate multiple system atrophy from idiopathic Parkinson's disease?
Auteurs : C. Tranchant [France] ; C. Guiraud-Chaumeil ; A. Echaniz-Laguna ; J M WarterSource :
- Journal of neurology [ 0340-5354 ] ; 2000.
English descriptors
- KwdEn :
- MESH :
- chemical , drug effects : Growth Hormone.
- chemical : Clonidine.
- diagnosis : Multiple System Atrophy, Parkinson Disease.
- Aged, Aged, 80 and over, Diagnosis, Differential, Female, Humans, Male, Middle Aged.
Abstract
Clonidine, a centrally active alpha 2-adrenoreceptor agonist used to lower blood pressure, has been proposed to differentiate central from peripheral autonomic deficits and multiple system atrophy (MSA) from untreated idiopathic Parkinson's disease (IPD). A lack of growth hormone (GH) increase after clonidine infusion is found in patients with MSA, but not in those with IPD or with pure autonomic failure. We studied 19 IPD and 7 MSA patients to assess whether this test could be used in clinical practice to distinguish MSA from IPD, whatever the stage of the disease. Serum GH levels were measured 15, 30, 45 and 60 min after a 10-min infusion of 2 micrograms/kg clonidine. GH levels remained stable after clonidine infusion in all 7 MSA patients but increased in only 12 of the 19 IPD patients, while remaining stable in the other 7. No correlation was found with the presence of orthostatic hypotension. We conclude that the GH response to clonidine infusion has a very high sensitivity (100% in our series and in previous studies) for the diagnosis of MSA. However, this response cannot be used as a diagnostic test because of its poor specificity.
PubMed: 11151417
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<front><div type="abstract" xml:lang="en">Clonidine, a centrally active alpha 2-adrenoreceptor agonist used to lower blood pressure, has been proposed to differentiate central from peripheral autonomic deficits and multiple system atrophy (MSA) from untreated idiopathic Parkinson's disease (IPD). A lack of growth hormone (GH) increase after clonidine infusion is found in patients with MSA, but not in those with IPD or with pure autonomic failure. We studied 19 IPD and 7 MSA patients to assess whether this test could be used in clinical practice to distinguish MSA from IPD, whatever the stage of the disease. Serum GH levels were measured 15, 30, 45 and 60 min after a 10-min infusion of 2 micrograms/kg clonidine. GH levels remained stable after clonidine infusion in all 7 MSA patients but increased in only 12 of the 19 IPD patients, while remaining stable in the other 7. No correlation was found with the presence of orthostatic hypotension. We conclude that the GH response to clonidine infusion has a very high sensitivity (100% in our series and in previous studies) for the diagnosis of MSA. However, this response cannot be used as a diagnostic test because of its poor specificity.</div>
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<Abstract><AbstractText>Clonidine, a centrally active alpha 2-adrenoreceptor agonist used to lower blood pressure, has been proposed to differentiate central from peripheral autonomic deficits and multiple system atrophy (MSA) from untreated idiopathic Parkinson's disease (IPD). A lack of growth hormone (GH) increase after clonidine infusion is found in patients with MSA, but not in those with IPD or with pure autonomic failure. We studied 19 IPD and 7 MSA patients to assess whether this test could be used in clinical practice to distinguish MSA from IPD, whatever the stage of the disease. Serum GH levels were measured 15, 30, 45 and 60 min after a 10-min infusion of 2 micrograms/kg clonidine. GH levels remained stable after clonidine infusion in all 7 MSA patients but increased in only 12 of the 19 IPD patients, while remaining stable in the other 7. No correlation was found with the presence of orthostatic hypotension. We conclude that the GH response to clonidine infusion has a very high sensitivity (100% in our series and in previous studies) for the diagnosis of MSA. However, this response cannot be used as a diagnostic test because of its poor specificity.</AbstractText>
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