Table 2. Characteristics of the C fiber nociceptors and sympathetic efferents.
CRPS I (13 patients) |
CRPS II (11 patients) |
||||||||
---|---|---|---|---|---|---|---|---|---|
C fiber subtype | N | CV (m.s−1) |
Slowing (%) | N | CV (m.s−1) |
Slowing (%) | |||
after “pause” |
2 Hz | after “pause” | 2 Hz | ||||||
CMH | 1a | 18 | 0.72±0.16 | 1.06±0.16 | 28.1±7.63 | 17 | 0.74±0.19 | 1.21±0.71 | 30.9±13.6 |
MIA | 1b | 8 | 0.47±0.17 | 4.36±1.16 | 34.4±13.7 | 11 | 0.48±0.24 | 3.86±1.20 | 39.8±22.5 |
Sympathetic | 4 | 18 | 0.63±0.19 | 1.67±1.54 | 4.74±1.93 | 4 | 0.51±0.35 | 1.20±0.54 | 4.80±0.18 |
CV = conduction velocity; CMH = mechano-sensitive C fiber nociceptor; MIA = mechano-insensitive C fiber nociceptor; Sympathetic = sympathetic efferent C fiber; Slowing = activity-dependent slowing of CV; “pause” refers to the 3-min period of 1/30 Hz stimulation, following which stimulation at 0.25 Hz resumed; 2 Hz = refers to the end of the 3-min period of stimulation at 2-Hz.