Effect of contrast and local anesthetic on dye spread following transversus abdominis plane injection in dog cadavers.
Vet Anaesth Analg
; 47(3): 391-395, 2020 May.
Article
em En
| MEDLINE
| ID: mdl-32192903
ABSTRACT
OBJECTIVE:
To determine whether the addition of bupivacaine or contrast medium to methylene blue dye would affect dye distribution following ultrasound (US)-guided transversus abdominis plane (TAP) injections. STUDYDESIGN:
Prospective, randomized, blinded cadaveric study. ANIMALS A total of 29 fresh Beagle dog cadavers.METHODS:
Each hemiabdomen (n = 58) was randomized into one of three groups group M, 1% methylene blue; group MB, 5050 mixture of 1% methylene blue and 0.5% bupivacaine; group MC, 2575 mixture of 1% methylene blue and contrast agent (iohexol). TAP injections (0.5 mL kg-1) were performed bilaterally by a trained individual followed by dissection of the abdominal walls. Craniocaudal and dorsoventral spread along tissue planes was measured. Staining of branches of the thoracic and lumbar spinal nerves was considered successful when dye on the nerve was >10 mm. One-way anova with post hoc Tukey test was used to compare craniocaudal and dorsoventral spread and Kruskal-Wallis test to compare incidence of nerve staining among groups.RESULTS:
TAP injections were successful in 52 out of 58 hemiabdomens. Dorsoventral spread was greater for group M (60 ± 10 mm) compared with MC (49 ± 9 mm; p = 0.01) but not MB (52 ± 9 mm; p = 0.09). No difference was found in craniocaudal spread or number of nerves stained among groups. CONCLUSION AND CLINICAL RELEVANCE The significant difference found in spread of tissue staining between methylene blue alone and methylene blue mixed with contrast in the TAP blocks should be kept in mind when interpreting dye-based cadaveric regional anesthesia studies.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Bupivacaína
/
Músculos Abdominais
/
Ultrassonografia de Intervenção
/
Anestésicos Locais
/
Bloqueio Nervoso
Tipo de estudo:
Observational_studies
/
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
Vet Anaesth Analg
Assunto da revista:
ANESTESIOLOGIA
/
MEDICINA VETERINARIA
Ano de publicação:
2020
Tipo de documento:
Article