scholarly journals Effect of digit ratio on contact heat evoked potentials in China

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Bo Sun ◽  
Hong-Fen Wang ◽  
Zheng-Qing He ◽  
Xu-Sheng Huang ◽  
Zhao-Hui Chen ◽  
...  
2020 ◽  
Vol 14 ◽  
Author(s):  
Malte Anders ◽  
Björn Anders ◽  
Matthias Kreuzer ◽  
Sebastian Zinn ◽  
Carmen Walter

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.


2012 ◽  
Vol 3 (3) ◽  
pp. 187-187
Author(s):  
C.S. Madsen ◽  
B. Johnsen ◽  
A. Fuglsang-Frederiksen ◽  
T.S. Jensen ◽  
N.B. Finnerup

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.


2019 ◽  
Vol 82/115 (1) ◽  
pp. 76-83
Author(s):  
Jana Raputová ◽  
Eva Vlčková ◽  
Jan Kočica ◽  
Tomáš Skutil ◽  
Aneta Rajdová ◽  
...  

Pain ◽  
2007 ◽  
Vol 132 (1) ◽  
pp. 102-107 ◽  
Author(s):  
A. Truini ◽  
F. Galeotti ◽  
E. Pennisi ◽  
F. Casa ◽  
A. Biasiotta ◽  
...  

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

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

Neuroscience ◽  
2012 ◽  
Vol 223 ◽  
pp. 92-101 ◽  
Author(s):  
C.S. Madsen ◽  
B. Johnsen ◽  
A. Fuglsang-Frederiksen ◽  
T.S. Jensen ◽  
N.B. Finnerup

2012 ◽  
Vol 29 (1) ◽  
pp. 70-75 ◽  
Author(s):  
John L. K. Kramer ◽  
Philippa Taylor ◽  
Jenny Haefeli ◽  
Julia Blum ◽  
Jose Zariffa ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document