2.50
Hdl Handle:
http://hdl.handle.net/10755/152859
Type:
Presentation
Title:
Threshold Current in the Intrathecal Space of Children
Abstract:
Threshold Current in the Intrathecal Space of Children
Conference Sponsor:Sigma Theta Tau International
Conference Year:2005
Author:Perry, shirley, RN
P.I. Institution Name:University of alberta
Title:Nurse Practioner MN
THRESHOLD CURRENT IN THE INTRATHECAL SPACE OF CHILDREN Shirley Perry MScN INTRODUCTION Previously, it was hypothesized that with electrical stimulation it would require <1mA to observe motor activity in the intrathecal space. This has been shown in individual case reports and in a porcine model, but never in a formal study. This study was designed to determine the threshold current necessary to elicit motor activity in the intrathecal space of pediatric oncology patients undergoing diagnostic or therapeutic lumbar punctures. METHODS A 18 or 20 gauge introducer was inserted at the L4-5 level followed by insulted 24 gauge Pajunck unipolar needle. The needle was then advance into the intrathecal space and confirmed by the presence of cerebrospinal fluid (CSF). At this point, an independent observer attached the insulated needle to a nerve stimulator and the current was increased until minimal threshold current for motor activity was observed. RESULTS Twenty pediatric oncology patients (ASA II or III) aged 7.9 +/-4.0 (1.6-16 yrs) were studied. The mean patient weight was 28.2 +/- 15.0 kg. There were 10 male and 10 female patients. The mean current to elicit motor activity in the intrathecal space was 0.6 +/-0.3 mA (range 0.1 û1 mA). Nineteen twitches were at the L3-5 myotomes and one patient had twitches at L2. 19 twitches at L2 were unilateral and 1 bilateral. DISCUSSION This study demonstrated that the mean threshold current necessary to elicit motor response in the intrathecal space of pediatric space of pediatric patients was 0.6 +/- 0.3mA and confirms the hypothesis that the minimal threshold current in the intrathecal space is < 1mA. As this differs from the threshold currents reported for electrical stimulation in the epidural space, one may potentially distinguish the epidural space from the intrathecal space.
Repository Posting Date:
26-Oct-2011
Date of Publication:
17-Oct-2011
Sponsors:
Sigma Theta Tau International

Full metadata record

DC FieldValue Language
dc.typePresentationen_GB
dc.titleThreshold Current in the Intrathecal Space of Childrenen_GB
dc.identifier.urihttp://hdl.handle.net/10755/152859-
dc.description.abstract<table><tr><td colspan="2" class="item-title">Threshold Current in the Intrathecal Space of Children</td></tr><tr class="item-sponsor"><td class="label">Conference Sponsor:</td><td class="value">Sigma Theta Tau International</td></tr><tr class="item-year"><td class="label">Conference Year:</td><td class="value">2005</td></tr><tr class="item-author"><td class="label">Author:</td><td class="value">Perry, shirley, RN</td></tr><tr class="item-institute"><td class="label">P.I. Institution Name:</td><td class="value">University of alberta</td></tr><tr class="item-author-title"><td class="label">Title:</td><td class="value">Nurse Practioner MN</td></tr><tr class="item-email"><td class="label">Email:</td><td class="value">stbperry@shaw.ca</td></tr><tr><td colspan="2" class="item-abstract">THRESHOLD CURRENT IN THE INTRATHECAL SPACE OF CHILDREN Shirley Perry MScN INTRODUCTION Previously, it was hypothesized that with electrical stimulation it would require &lt;1mA to observe motor activity in the intrathecal space. This has been shown in individual case reports and in a porcine model, but never in a formal study. This study was designed to determine the threshold current necessary to elicit motor activity in the intrathecal space of pediatric oncology patients undergoing diagnostic or therapeutic lumbar punctures. METHODS A 18 or 20 gauge introducer was inserted at the L4-5 level followed by insulted 24 gauge Pajunck unipolar needle. The needle was then advance into the intrathecal space and confirmed by the presence of cerebrospinal fluid (CSF). At this point, an independent observer attached the insulated needle to a nerve stimulator and the current was increased until minimal threshold current for motor activity was observed. RESULTS Twenty pediatric oncology patients (ASA II or III) aged 7.9 +/-4.0 (1.6-16 yrs) were studied. The mean patient weight was 28.2 +/- 15.0 kg. There were 10 male and 10 female patients. The mean current to elicit motor activity in the intrathecal space was 0.6 +/-0.3 mA (range 0.1 &ucirc;1 mA). Nineteen twitches were at the L3-5 myotomes and one patient had twitches at L2. 19 twitches at L2 were unilateral and 1 bilateral. DISCUSSION This study demonstrated that the mean threshold current necessary to elicit motor response in the intrathecal space of pediatric space of pediatric patients was 0.6 +/- 0.3mA and confirms the hypothesis that the minimal threshold current in the intrathecal space is &lt; 1mA. As this differs from the threshold currents reported for electrical stimulation in the epidural space, one may potentially distinguish the epidural space from the intrathecal space.</td></tr></table>en_GB
dc.date.available2011-10-26T11:52:42Z-
dc.date.issued2011-10-17en_GB
dc.date.accessioned2011-10-26T11:52:42Z-
dc.description.sponsorshipSigma Theta Tau Internationalen_GB
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