Ultrasound visibility of regional anesthesia catheters: an in vitro study
BackgroundUltrasound subjective visibility of in-plane needles is correlated with the intensity difference between the needle surface and the background. Regional anesthesia catheters are difficult to visualize by an ultrasound. In the present study, we investigated the ultrasound visibility of the...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Korean Society of Anesthesiologists
2012-07-01
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| Series: | Korean Journal of Anesthesiology |
| Subjects: | |
| Online Access: | http://ekja.org/upload/pdf/kjae-63-59.pdf |
| _version_ | 1818384377012289536 |
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| author | Junji Takatani Naozumi Takeshima Kentaro Okuda Tetsuya Uchino Takayuki Noguchi |
| author_facet | Junji Takatani Naozumi Takeshima Kentaro Okuda Tetsuya Uchino Takayuki Noguchi |
| author_sort | Junji Takatani |
| collection | DOAJ |
| description | BackgroundUltrasound subjective visibility of in-plane needles is correlated with the intensity difference between the needle surface and the background. Regional anesthesia catheters are difficult to visualize by an ultrasound. In the present study, we investigated the ultrasound visibility of the catheters.MethodsSix catheters were placed at 0° and 30° relative to and at a depth of 1 cm below the pork phantom surface. Ultrasound images of in-plane catheters were evaluated, subjectively and objectively. Outer and inner objective visibilities were defined as the difference in the mean pixel intensity between the catheter surface and adjacent background, and between the surface and the center of the catheter, respectively. Evaluations were made based on the portion of the catheters. A P value < 0.05 was considered significant.ResultsSubjective visibility was more strongly correlated with the inner objective visibility than with the outer objective visibility at both angles. Metallic 19-gauge catheters were more subjectively visible than the non-metallic 20-gauge catheters at 30° degrees (P < 0.01). Subjective, and outer and inner objective visibility were significantly lower at 30° than at 0° (P < 0.01, P < 0.01, P = 0.02). Perifix ONE at 0° and Perifix FX at 30° were the most visible catheters (P < 0.01 for both).ConclusionsSubjective visibility of catheters can not be evaluated in the same manner as that of the needles. For the best possible visualization, we recommend selecting a catheter with a structure that enhances the dark at the center of catheter, rather than basing the catheter selection on the bore size. |
| first_indexed | 2024-12-14T03:21:17Z |
| format | Article |
| id | doaj.art-cafd3427c66b4d548af5ce15d8e7cf18 |
| institution | Directory Open Access Journal |
| issn | 2005-6419 2005-7563 |
| language | English |
| last_indexed | 2024-12-14T03:21:17Z |
| publishDate | 2012-07-01 |
| publisher | Korean Society of Anesthesiologists |
| record_format | Article |
| series | Korean Journal of Anesthesiology |
| spelling | doaj.art-cafd3427c66b4d548af5ce15d8e7cf182022-12-21T23:19:02ZengKorean Society of AnesthesiologistsKorean Journal of Anesthesiology2005-64192005-75632012-07-01631596410.4097/kjae.2012.63.1.597486Ultrasound visibility of regional anesthesia catheters: an in vitro studyJunji Takatani0Naozumi Takeshima1Kentaro Okuda2Tetsuya Uchino3Takayuki Noguchi4Department of Anesthesiology and Critical Care Medicine, Oita University Faculty of Medicine, Oita, Japan.Department of Anesthesiology and Critical Care Medicine, Oita University Faculty of Medicine, Oita, Japan.Department of Anesthesiology and Critical Care Medicine, Oita University Faculty of Medicine, Oita, Japan.Department of Anesthesiology and Critical Care Medicine, Oita University Faculty of Medicine, Oita, Japan.Department of Anesthesiology and Critical Care Medicine, Oita University Faculty of Medicine, Oita, Japan.BackgroundUltrasound subjective visibility of in-plane needles is correlated with the intensity difference between the needle surface and the background. Regional anesthesia catheters are difficult to visualize by an ultrasound. In the present study, we investigated the ultrasound visibility of the catheters.MethodsSix catheters were placed at 0° and 30° relative to and at a depth of 1 cm below the pork phantom surface. Ultrasound images of in-plane catheters were evaluated, subjectively and objectively. Outer and inner objective visibilities were defined as the difference in the mean pixel intensity between the catheter surface and adjacent background, and between the surface and the center of the catheter, respectively. Evaluations were made based on the portion of the catheters. A P value < 0.05 was considered significant.ResultsSubjective visibility was more strongly correlated with the inner objective visibility than with the outer objective visibility at both angles. Metallic 19-gauge catheters were more subjectively visible than the non-metallic 20-gauge catheters at 30° degrees (P < 0.01). Subjective, and outer and inner objective visibility were significantly lower at 30° than at 0° (P < 0.01, P < 0.01, P = 0.02). Perifix ONE at 0° and Perifix FX at 30° were the most visible catheters (P < 0.01 for both).ConclusionsSubjective visibility of catheters can not be evaluated in the same manner as that of the needles. For the best possible visualization, we recommend selecting a catheter with a structure that enhances the dark at the center of catheter, rather than basing the catheter selection on the bore size.http://ekja.org/upload/pdf/kjae-63-59.pdfcathetersnerve blockregional anesthesiaultrasonography |
| spellingShingle | Junji Takatani Naozumi Takeshima Kentaro Okuda Tetsuya Uchino Takayuki Noguchi Ultrasound visibility of regional anesthesia catheters: an in vitro study Korean Journal of Anesthesiology catheters nerve block regional anesthesia ultrasonography |
| title | Ultrasound visibility of regional anesthesia catheters: an in vitro study |
| title_full | Ultrasound visibility of regional anesthesia catheters: an in vitro study |
| title_fullStr | Ultrasound visibility of regional anesthesia catheters: an in vitro study |
| title_full_unstemmed | Ultrasound visibility of regional anesthesia catheters: an in vitro study |
| title_short | Ultrasound visibility of regional anesthesia catheters: an in vitro study |
| title_sort | ultrasound visibility of regional anesthesia catheters an in vitro study |
| topic | catheters nerve block regional anesthesia ultrasonography |
| url | http://ekja.org/upload/pdf/kjae-63-59.pdf |
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