Evokované potenciály vyvolané kontaktním teplem – vliv fyziologických proměnných

Title in English Contact heat evoked potentials - impact of physiological variables


Year of publication 2019
Type Article in Periodical
Magazine / Source Česká a slovenská neurologie a neurochirurgie
MU Faculty or unit

Faculty of Medicine

Web http://dx.doi.org/10.14735/amcsnn201976
Doi http://dx.doi.org/10.14735/amcsnn201976
Keywords somatosensory evoked potentials; small fiber neuropathy; spinothalamic tract; neuropathic pain; reference values
Description Introduction: Contact heat evoked potentials (CHEPs) represent a new neurophysiological method of functional testing of small nerve fibers and the spinothalamic tracts. The study aimed to confirm the validity of published normal values for this method in the Czech population and to evaluate the influence of physiological and test-related variables on the CHEPs response. Patients and methods: Two groups were included in the study - a healthy control group (97 healthy volunteers; 53 women; age range 20-82 years) and a group of patients with diabetic distal sensorimotor polyneuropathy (DSPN group, 37 patients; 14 women; age range 29-77 years). In all of the participants, CHEPs were examined in the dorsum of the hand and above the ankle using basic and intensive temperature algorithm. Results: The CHEPs testing was mostly well-tolerated. The vast majority of the latencies and amplitudes of the CHEPs responses obtained in the healthy control group fell within the reference range according to the published normal values. Testrelated variables showed also a highly significant impact on CHEPs values - the latencies were shorter in hands (compared to the calf) and whenever the intensive temperature algorithm was used (p < 0.001 in both cases). Women had significantly higher amplitudes and shorter latencies (p < 0.05). Older volunteers had significantly lower amplitudes (p < 0.05) than the younger ones. The DSPN group had longer latencies (p < 0.05) and lower amplitudes (p < 0.05) in comparison with control group. Conclusion: The study confirmed validity of published normal values for the Czech population. For precise evaluation of the results, physiological (gender, age) and test-related parameters (tested area, temperature algorithm) should be taken into account. On a group level, CHEPs proved to be a useful tool for small-nerve fiber dysfunction assessment in DSPN.
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