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| Naji, M. |
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| Motta, Antonella |
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| Ertürk, Emre |
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| Petrov, R. H. | Madrid |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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Haanpää, Maija
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article
Quantitative sensory testing using DFNS protocol in Europe
Abstract
<p>Quantitative sensory testing (QST) in accordance with the DFNS (German Research Network on Neuropathic Pain) protocol assesses the function of afferent nerve fibers on the basis of 13 parameters. Within the consortia IMI (Innovative Medicines Initiative) Europain and Neuropain, QST results from pain research units experienced in QST across Europe can be compared for the first time. Aim of this analysis was to identify possible biases in the QST assessment between 10 centers from 8 different European countries. In total, 188 healthy subjects, 217 patients with painful polyneuropathy, and 150 patients with painful peripheral nerve injury were included in the analysis. Mixed effects models were constructed for each of the 11 normally distributed QST parameters with z-value as the dependent variable, and center as the random effect. The I<sup>2</sup> statistic for heterogeneity was calculated, an index ranging from 0% (no heterogeneity) to 100% (perfect heterogeneity). Data from healthy subjects were comparable with the existing reference data base. Patients with polyneuropathy mainly displayed loss of sensory function, whereas patients with peripheral nerve injury often showed sensory loss combined with mechanical hyperalgesia. Heterogeneity was overall low between different centers and parameters. There was no systematic heterogeneity for patients with painful peripheral nerve injury and painful polyneuropathy. For healthy subjects, only blunt pressure pain threshold showed a considerable heterogeneity of 42% (95% confidence interval: 0%-66%). In conclusion, QST of both healthy subjects and patients with peripheral neuropathic pain is largely homogenous within the European centers, an essential prerequisite for performing multicenter QST-based studies.</p>