The cut-off rate of skin temperature change to confirm successful lumbar sympathetic block.
The purpose of this study was to find the best cut-off value for the rate of change in temperature of the plantar surface of the foot for predicting the success of lumbar sympathetic block (LSB). A total of 185 LSBs were performed on 82 patients via a posterolateral approach under fluoroscopic guidance. Successful LSB was considered to have occurred when changes in the ipsilateral temperature between pre-block and post-block were > or = 2 degrees C. A receiver operating characteristic (ROC) curve for the minimum rate of temperature change was constructed as a predictor of the onset of a successful LSB. The area under the ROC curve was 0.971 at the rate of 0.4 degrees C/min with a sensitivity of 89.5% and a specificity of 91.8%. Achieving a rate of temperature change of 0.4 degrees C/min within approximately 5 min of the injection of local anaesthetic could be used as an indicator of the onset of successful LSB.
Park
S Y
SY
Department of Anaesthesiology and Pain Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
Nahm
F S
FS
Kim
Y C
YC
Lee
S C
SC
Sim
S E
SE
Lee
S J
SJ
D000293:Adolescent; D000328:Adult; D000368:Aged; D001340:Autonomic Nerve Block; D020918:Complex Regional Pain Syndromes / Q000628:therapy*; D005260:Female; D005471:Fluoroscopy; D005528:Foot; D006801:Humans; D008161:Lumbosacral Region / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D012372:ROC Curve; D012680:Sensitivity and Specificity; D012881:Skin Temperature; D013564:Sympathetic Nervous System / Q000503:physiopathology*; D055815:Young Adult