Document Detail

Less leakage and dislodgement with a catheter-over-needle versus a catheter-through-needle approach for peripheral nerve block: an ex vivo study.
MedLine Citation:
PMID:  22565332     Owner:  NLM     Status:  Publisher    
PURPOSE: The objective of this study was to compare the catheter-through-needle (CTN) and catheter-over-needle (CON) catheterization techniques ex vivo by measuring leak pressure around the catheter and the catheter's resistance to pulling force. METHODS: Using an ex vivo porcine limb model, we compared the conventional CTN design with the CON design with respect to the ability to resist leakage at the catheter insertion site under high injection pressure and the force required to withdraw the catheter from tissue. One CON assembly (MultiSet, Pajunk) and three CTN assemblies (Contiplex, B.Braun; StimuCath, Arrow; Stimulong Sono, Pajunk) were studied. Ten porcine hind limbs were used to test leakage and another ten were used to measure withdrawal force. Catheters were placed at angles of 15° and 30° at depths of 3 cm and 5 cm. Leakage was assessed visually at the insertion site, and pressure was measured at the moment leakage occurred. Withdrawal force was measured by pulling the catheter from the tissue. RESULTS: No evidence of leakage was detected at the CON catheter insertion site at the highest pressure applied (1,000 mmHg) (n = 40). The CON assembly withstood significantly higher injection pressure than the CTN catheters without causing leaks at the catheter insertion site [CON, mean (standard deviation) > 1,000 (0) mmHg; B.Braun, 596 (92) mmHg; Pajunk Stimulong, 615 (107) mmHg; and Arrow, 422 (104) mmHg; P < 0.001 CON vs CTN]. The force required to withdraw the catheter from the porcine limb was greater with CON catheters [3.8 (0.8) N] than with any of the CTN catheters [range, 0.4 (0.2) - 0.8 (0.2) N], depending on depth, angle, and manufacturer (P < 0.001 CON vs CTN). CONCLUSION: In the porcine leg model, CON catheterization provides greater resistance to leakage under high injection pressure and greater holding force in tissue than traditional CTN catheters.
Ban C H Tsui; Jenkin Tsui
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-8
Journal Detail:
Title:  Canadian journal of anaesthesia = Journal canadien d'anesthesie     Volume:  -     ISSN:  1496-8975     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8701709     Medline TA:  Can J Anaesth     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Anesthesiology and Pain Medicine, University of Alberta, 8-120 Clinical Sciences Building, Edmonton, AB, T6G 2G3, Canada,
Vernacular Title:
Moins de fuites et de déplacements avec un cathéter par-dessus l'aiguille qu'avec un cathéter à travers l'aiguille pour un bloc nerveux périphérique: une étude ex vivo.
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