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.
Department of Anaesthesiology and Pain Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
S Y
SY
Park
F S
FS
Nahm
Y C
YC
Kim
S C
SC
Lee
S E
SE
Sim
S J
SJ
Lee
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