Document Detail

Minimal threshold for stimulating catheters.
MedLine Citation:
PMID:  18346609     Owner:  NLM     Status:  MEDLINE    
A patient undergoing total knee replacement was fitted with a stimulating femoral catheter for postoperative analgesia. After the catheter was secured to the skin, the minimal stimulatory threshold was verified again and found to be extremely low (0.00-0.01 mA; pulse width, 0.1 ms). However, in spite of this situation, no paresthesia or pain was experienced by the patient. Use of the catheter resulted in satisfactory analgesia with no complications noted during the hospital stay or at follow-up three months later. When the nerve stimulator was sent to our biomedical engineering department to verify the accuracy of its current output, it was found to be functioning adequately. Neurostimulation is a complex phenomenon that is far from being completely understood. On the basis of this single report, we cannot recommend the routine use of a threshold inferior to 0.2 mA for neural electrolocation. However, we do not advocate the requirement of strict numerical thresholds either. Further research is needed to understand the relationship linking stimulatory threshold and distance between needle (or catheter) tip and nerve.
De Q H Tran; Jason Taam; Juan Carlos De La Cuadra-Fontaine
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Journal of clinical anesthesia     Volume:  20     ISSN:  0952-8180     ISO Abbreviation:  J Clin Anesth     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-03-18     Completed Date:  2008-07-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8812166     Medline TA:  J Clin Anesth     Country:  United States    
Other Details:
Languages:  eng     Pagination:  45-7     Citation Subset:  IM    
Department of Anesthesia, The Montreal General Hospital, McGill University Health Center, Montreal, QC, Canada H3G 1A4.
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MeSH Terms
Analgesia, Patient-Controlled / instrumentation*,  methods
Arthroplasty, Replacement, Knee
Catheterization / instrumentation
Electric Stimulation / instrumentation*,  methods
Equipment Failure
Follow-Up Studies
Middle Aged

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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