The role of electrical stimulation in ultrasound-guided subgluteal sciatic nerve block: a retrospective study on how response pattern and minimal evoked current affect the resultant blockade

Purpose Nerve stimulation may be combined with ultrasound imaging for a block of deeply located nerves such as the sciatic nerve in the subgluteal region. At present, it is unknown how the use of nerve stimulation affects blockade after this nerve block. We retrospectively compared the effects of th...

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Bibliographic Details
Published in:Journal of anesthesia 2014-08, Vol.28 (4), p.524-531
Main Authors: Hara, Kaoru, Sakura, Shinichi, Yokokawa, Naomi
Format: Article
Language:English
Subjects:
Adult
Amides
Anesthesiology
Anesthetics, Local
Arthroscopy - methods
Buttocks - diagnostic imaging
Care and treatment
Critical Care Medicine
Diagnosis
Electric Stimulation - methods
Emergency Medicine
Female
Humans
Intensive
Knee - surgery
Male
Medicine
Medicine & Public Health
Mepivacaine
Nerve block
Original Article
Pain Medicine
Retrospective Studies
Risk factors
Sciatic Nerve
Ultrasonography, Interventional - methods
Ultrasound imaging
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Summary:Purpose Nerve stimulation may be combined with ultrasound imaging for a block of deeply located nerves such as the sciatic nerve in the subgluteal region. At present, it is unknown how the use of nerve stimulation affects blockade after this nerve block. We retrospectively compared the effects of the two types of motor response and those of minimal evoked current above and below 0.5 mA on ultrasound-guided subgluteal sciatic nerve block using mepivacaine or ropivacaine, two local anesthetics with different onset time and duration. Methods We reviewed records and video images of patients who, from April 2008 until October 2011, received ultrasound-guided subgluteal sciatic nerve block combined with nerve stimulation using 20 ml of either 1.5 % mepivacaine with 1:400,000 epinephrine or 0.5 % ropivacaine. Sensory and motor blockade data for 30 min after the block and for the duration of the blockade were gathered. Patients for whom any data were missing, the video image was poor, and/or intraneural injection was observed during the block were excluded from the study. The same data were compared in two ways: regarding the motor response pattern between the response of the tibial nerve and the common peroneal nerve, and regarding the minimal current between low current (
ISSN:0913-8668
1438-8359
DOI:10.1007/s00540-013-1746-x