scholarly journals Contact Heat Evoked Potentials in China: Normal Values and Reproducibility

2022 ◽  
Vol 15 ◽  
Author(s):  
Bo Sun ◽  
Hongfen Wang ◽  
Zhaohui Chen ◽  
Fang Cui ◽  
Fei Yang ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Normal Values ◽  
Visual Analog Scale Score ◽  
Optimal Number ◽  
Chinese Adults ◽  
Contact Heat ◽  
Test Technique ◽  
Contact Heat Evoked Potentials ◽  
Baseline Temperature

Background: Contact heat evoked potentials (CHEPs) is used to diagnose small fiber neuropathy (SFN). We established the normal values of CHEPs parameters in Chinese adults, optimized the test technique, and determined its reproducibility.Methods: We recruited 151 healthy adults (80 men; mean age, 37 ± 14 years). CHEPs was performed on the right forearm to determine the optimal number of stimuli, and then conducted at different sites to establish normal values, determine the effects of demographic characteristics and baseline temperature, and assess the short- (30 min) and long-term (1 year) reproducibility. N2 latency/height varied with age and sex, while P2 latency/height and N2–P2 amplitude varied with age. The optimal number of stimuli was three.Results: N2 latency/height (t = 5.45, P < 0.001) and P2 latency/height (χ2 = −4.06, P < 0.001) decreased and N2–P2 amplitude (t = −5.01, P < 0.001) and visual analog scale score (χ2 = −5.84, P < 0.001) increased with increased baseline temperature (35 vs. 32°C). CHEPs parameters did not differ with time (baseline vs. 30 min vs. 1 year).Conclusion: We established normal CHEPs values in Chinese adults. We found that CHEPs parameters changed with baseline temperature and that the short- and long-term test reproducibility were satisfactory.

Contact heat evoked potentials: Normal values and use in small-fiber neuropathy

2015 ◽  
Vol 51 (5) ◽  
pp. 743-749 ◽  
Author(s):  
Vera Lagerburg ◽  
Mayienne Bakkers ◽  
Anne Bouwhuis ◽  
Janneke G.J. Hoeijmakers ◽  
Arjen M. Smit ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Normal Values ◽  
Small Fiber Neuropathy ◽  
Contact Heat ◽  
Small Fiber ◽  
Contact Heat Evoked Potentials

scholarly journals Application of Referencing Techniques in EEG-Based Recordings of Contact Heat Evoked Potentials (CHEPS)

2020 ◽  
Vol 14 ◽  
Author(s):  
Malte Anders ◽  
Björn Anders ◽  
Matthias Kreuzer ◽  
Sebastian Zinn ◽  
Carmen Walter
Keyword(s):  
Evoked Potentials ◽  
Reference Electrode ◽  
Objective Measure ◽  
Time Spectrum ◽  
Electrode Site ◽  
Contact Heat ◽  
Theoretical Terms ◽  
Average Reference ◽  
Brain Responses ◽  
Contact Heat Evoked Potentials

Evoked potentials in the amplitude-time spectrum of the electroencephalogram are commonly used to assess the extent of brain responses to stimulation with noxious contact heat. The magnitude of the N- and P-waves are used as a semi-objective measure of the response to the painful stimulus: the higher the magnitude, the more painful the stimulus has been perceived. The strength of the N-P-wave response is also largely dependent on the chosen reference electrode site. The goal of this study was to examine which reference technique excels both in practical and theoretical terms when analyzing noxious contact heat evoked potentials (CHEPS) in the amplitude-time spectrum. We recruited 21 subjects (10 male, 11 female, mean age of 55.79 years). We applied seven noxious contact heat stimuli using two temperatures, 51°C, and 54°C, to each subject. During EEG analysis, we aimed to identify the referencing technique which produces the highest N-wave and P-wave amplitudes with as little artifactual influence as possible. For this purpose, we applied the following six referencing techniques: mathematically linked A1/A2 (earlobes), average reference, REST, AFz, Pz, and mathematically linked PO7/PO8. We evaluated how these techniques impact the N-P amplitudes of CHEPS based on our data from healthy subjects. Considering all factors, we found that mathematically linked earlobes to be the ideal referencing site to use when displaying and evaluating CHEPS in the amplitude-time spectrum.

The effect of nerve compression and capsaicin on contact heat evoked potentials (CHEPs) related to Aδ and C fibers

2012 ◽  
Vol 3 (3) ◽  
pp. 187-187
Author(s):  
C.S. Madsen ◽  
B. Johnsen ◽  
A. Fuglsang-Frederiksen ◽  
T.S. Jensen ◽  
N.B. Finnerup
Keyword(s):  
Evoked Potentials ◽  
Pain Intensity ◽  
Radial Nerve ◽  
Nerve Compression ◽  
Contact Heat ◽  
Noxious Heat ◽  
Superficial Radial Nerve ◽  
C Fibers ◽  
Contact Heat Evoked Potentials ◽  
C Fiber

Abstract Background/aims Brief noxious heat stimuli activate Aδ and C fibers, and contact heat evoked potentials (CHEPs) can be recorded from the scalp. Under standard conditions, late responses related to AS fibers can be recorded. This study examines C-fiber responses to contact heat stimuli. Methods A preferential A-fiber blockade by compression to the superficial radial nerve was applied in 22 healthy subjects. Quality and intensity of heat evoked pain (NRS, 0–10), and CHEPs were examined at baseline, during nerve compression, and during further nerve compression with topical capsaicin (5%). Results During the A-fiber blockade, 3 subjects had CHEPs with latencies below 400 ms, 8 subjects within 400–800 ms and 6 subjects later than 800 ms. Pain intensity to contact heat stimuli was reduced and fewer subjects reported the heat stimuli as stinging. Following acute capsaicin application, ultralate CHEPs with latencies >800 ms could be recorded in 13 subjects, pain intensity to the contact heat stimuli was increased (p <0.01) and more subjects reported the heat stimuli as being more warm/hot-burning. Conclusion The results indicate that following a compression to the superficial radial nerve, CHEPs compatible within complete A fibers or C fibers were recorded. Following sensitization with capsaicin, C-fiber responses were recorded in 62% of subjects.

Contact heat evoked potentials – impact of physiological variables

2019 ◽  
Vol 82/115 (1) ◽  
pp. 76-83
Author(s):  
Jana Raputová ◽  
Eva Vlčková ◽  
Jan Kočica ◽  
Tomáš Skutil ◽  
Aneta Rajdová ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Contact Heat ◽  
Physiological Variables ◽  
Contact Heat Evoked Potentials

Trigeminal small-fibre function assessed with contact heat evoked potentials in humans

Pain ◽  
2007 ◽  
Vol 132 (1) ◽  
pp. 102-107 ◽  
Author(s):  
A. Truini ◽  
F. Galeotti ◽  
E. Pennisi ◽  
F. Casa ◽  
A. Biasiotta ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Contact Heat ◽  
Small Fibre ◽  
Contact Heat Evoked Potentials ◽  
Evoked Potentials In Humans

scholarly journals Contact heat evoked potentials and habituation measured interictally in migraineurs

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Lena Clara Beese ◽  
Denise Putzer ◽  
Nani Osada ◽  
Stefan Evers ◽  
Martin Marziniak
Keyword(s):  
Evoked Potentials ◽  
Contact Heat ◽  
Contact Heat Evoked Potentials

scholarly journals Contact heat evoked potentials (CHEPS) in patients with painful and non-painful polyneuropathies

2015 ◽  
Vol 357 ◽  
pp. e90
Author(s):  
G. Barraza ◽  
M. Campero ◽  
J.M. Matamala ◽  
J.L. Castillo ◽  
R.J. Guiloff
Keyword(s):  
Evoked Potentials ◽  
Contact Heat ◽  
Contact Heat Evoked Potentials
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