Pain-autonomic measures reveal nociceptive sensitization in complex regional pain syndrome.
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BORIS DOI
Publisher DOI
PubMed ID
36130736
Description
BACKGROUND
Allodynia and hyperalgesia are common signs in individuals with complex regional pain syndrome (CRPS), mainly attributed to sensitization of the nociceptive system. Appropriate diagnostic tools for the objective assessment of such hypersensitivities are still lacking, which are essential for the development of mechanism-based treatment strategies.
OBJECTIVES
This study investigated the use of pain-autonomic readouts to objectively detect sensitization processes in CRPS.
METHODS
Twenty individuals with chronic CRPS were recruited for the study alongside 16 age- and sex-matched healthy controls (HC). All individuals underwent quantitative sensory testing and neurophysiological assessments. Sympathetic skin responses (SSRs) were recorded in response to 15 pinprick and 15 noxious heat stimuli of the affected (CRPS hand/foot) and a control area (contralateral shoulder/hand).
RESULTS
Individuals with CRPS showed increased mechanical pain sensitivity and increased SSR amplitudes compared to HC in response to pinprick and heat stimulation of the affected (p<.001), but not the control area (p>.05). Habituation of pinprick-induced SSRs was reduced in CRPS compared to HC in both the affected (p=.018) and slightly in the control area (p=.048). Habituation of heat-induced SSR was reduced in CRPS in the affected (p=0.008), but not the control area (p=0.053).
CONCLUSIONS
This is the first study demonstrating clinical evidence that pain-related autonomic responses may represent objective tools to quantify sensitization processes along the nociceptive neuraxis in CRPS (e.g., widespread hyperexcitability). Pain-autonomic readouts could help scrutinize mechanisms underlying the development and maintenance of chronic pain in CRPS and provide valuable metrics to detect mechanism-based treatment responses in clinical trials.
SIGNIFICANCE
This study provides clinical evidence that autonomic measures to noxious stimuli can objectively detect sensitization processes along the nociceptive neuraxis in complex regional pain syndrome (CRPS) (e.g., widespread hyperaxcitability). Pain-autonomic readouts may represent valuable tools to explore pathophysiological mechanisms in a variety of pain patients and offer novel avenues to help guide mechanism-based therapeutic strategies.
Allodynia and hyperalgesia are common signs in individuals with complex regional pain syndrome (CRPS), mainly attributed to sensitization of the nociceptive system. Appropriate diagnostic tools for the objective assessment of such hypersensitivities are still lacking, which are essential for the development of mechanism-based treatment strategies.
OBJECTIVES
This study investigated the use of pain-autonomic readouts to objectively detect sensitization processes in CRPS.
METHODS
Twenty individuals with chronic CRPS were recruited for the study alongside 16 age- and sex-matched healthy controls (HC). All individuals underwent quantitative sensory testing and neurophysiological assessments. Sympathetic skin responses (SSRs) were recorded in response to 15 pinprick and 15 noxious heat stimuli of the affected (CRPS hand/foot) and a control area (contralateral shoulder/hand).
RESULTS
Individuals with CRPS showed increased mechanical pain sensitivity and increased SSR amplitudes compared to HC in response to pinprick and heat stimulation of the affected (p<.001), but not the control area (p>.05). Habituation of pinprick-induced SSRs was reduced in CRPS compared to HC in both the affected (p=.018) and slightly in the control area (p=.048). Habituation of heat-induced SSR was reduced in CRPS in the affected (p=0.008), but not the control area (p=0.053).
CONCLUSIONS
This is the first study demonstrating clinical evidence that pain-related autonomic responses may represent objective tools to quantify sensitization processes along the nociceptive neuraxis in CRPS (e.g., widespread hyperexcitability). Pain-autonomic readouts could help scrutinize mechanisms underlying the development and maintenance of chronic pain in CRPS and provide valuable metrics to detect mechanism-based treatment responses in clinical trials.
SIGNIFICANCE
This study provides clinical evidence that autonomic measures to noxious stimuli can objectively detect sensitization processes along the nociceptive neuraxis in complex regional pain syndrome (CRPS) (e.g., widespread hyperaxcitability). Pain-autonomic readouts may represent valuable tools to explore pathophysiological mechanisms in a variety of pain patients and offer novel avenues to help guide mechanism-based therapeutic strategies.
Date of Publication
2023-01
Publication Type
Article
Subject(s)
600 - Technology::610 - Medicine & health
Language(s)
en
Contributor(s)
De Schoenmacker, I | |
Brunner, F | |
Curt, A | |
Hubli, M |
Additional Credits
Universitätsklinik für Neurologie
Series
European journal of pain
Publisher
Wiley-Blackwell
ISSN
1090-3801
Access(Rights)
open.access