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Polo-Paredes G, Soler M, Gil F, Laredo FG, Agut A, Carrillo-Flores S, Belda E. Description and Evaluation of Dye and Contrast Media Distribution of Ultrasound-Guided Rectus Sheath Block in Cat Cadavers. Animals (Basel) 2024; 14:1743. [PMID: 38929362 PMCID: PMC11200878 DOI: 10.3390/ani14121743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2024] [Revised: 05/28/2024] [Accepted: 06/07/2024] [Indexed: 06/28/2024] Open
Abstract
The rectus sheath block is an ultrasound-guided anaesthetic technique which aims to provide analgesia to the abdominal midline. This study aimed to assess the distribution of 0.4 mL kg-1 of a mixture of methylene blue and iopromide injected into each hemiabdomen in the internal rectus sheath in cat cadavers. We hypothesise that this technique would be feasible and would cover the rami ventrales of the last thoracic and the first lumbar spinal nerves. The study was divided into two phases. Phase 1 aimed to study the anatomical structures of the ventral abdominal wall (four cats were dissected). Phase 2 (ten cadavers) consisted of an ultrasound-guided injection of the mixture mentioned above and the assessment of its distribution by computed tomography and anatomical dissection. The results showed the staining of the cranioventral abdominal wall with a craniocaudal spread of four (three to eight) vertebral bodies. Methylene blue stained three (one to four) rami ventrales, affecting T10 (60%), T11 (100%), T12 (90%), T13 (50%) and L1 (5%). Based on these results, it could be stated that this technique could supply anaesthesia to the midline of the abdominal midline cranial to the umbilicus in clinical patients, but it may not be able to provide anaesthesia to the middle and caudal midline abdominal region.
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Affiliation(s)
- Gonzalo Polo-Paredes
- Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad de Murcia, 30100 Murcia, Spain; (G.P.-P.); (M.S.); (F.G.L.); (A.A.)
- Hospital Veterinario Universidad de Murcia, 30100 Murcia, Spain;
- Escuela Internacional de Doctorado de la Universidad de Murcia, Programa en Ciencias Veterinarias, Universidad de Murcia, 30100 Murcia, Spain
| | - Marta Soler
- Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad de Murcia, 30100 Murcia, Spain; (G.P.-P.); (M.S.); (F.G.L.); (A.A.)
- Hospital Veterinario Universidad de Murcia, 30100 Murcia, Spain;
| | - Francisco Gil
- Departamento de Anatomía y Anatomía Patológica Comparada, Facultad de Veterinaria, Universidad de Murcia, 30100 Murcia, Spain;
| | - Francisco G. Laredo
- Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad de Murcia, 30100 Murcia, Spain; (G.P.-P.); (M.S.); (F.G.L.); (A.A.)
- Hospital Veterinario Universidad de Murcia, 30100 Murcia, Spain;
| | - Amalia Agut
- Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad de Murcia, 30100 Murcia, Spain; (G.P.-P.); (M.S.); (F.G.L.); (A.A.)
- Hospital Veterinario Universidad de Murcia, 30100 Murcia, Spain;
| | | | - Eliseo Belda
- Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad de Murcia, 30100 Murcia, Spain; (G.P.-P.); (M.S.); (F.G.L.); (A.A.)
- Hospital Veterinario Universidad de Murcia, 30100 Murcia, Spain;
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Aitken MR, Floriano DA, Hopster K. Open Approach to the Transversus Abdominis Plane in Horses: A Cadaver Feasibility Study. Vet Sci 2024; 11:51. [PMID: 38275933 PMCID: PMC10818621 DOI: 10.3390/vetsci11010051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 01/19/2024] [Accepted: 01/20/2024] [Indexed: 01/27/2024] Open
Abstract
The study's objective was to evaluate the feasibility and dispersion of an open approach to the transversus abdominis plane (TAP) block in eight adult equine cadavers. A ventral midline incision was made, starting 2 cm cranial to the umbilicus and extending 25 cm cranially. In total, 0.5 mL/kg of new methylene blue (NMB) was injected per horse, divided into six injections. Using an 18 g, 8 cm Tuohy needle, three injections were made per side. The needle was guided blindly into the TAP using palpation. A 60 mL syringe was attached directly to the needle, depositing ~0.08 mL/kg at each site. The time to complete the injections was recorded for each cadaver. Following injection, the ventral body wall was dissected to determine if the dye was present within the TAP space as well as to measure the extent of the dispersion of the dye, the cranial to caudal extent, and the width of the dye's spread. Complete deposition of NMB into the TAP (six of six sites) was achieved in 5/8 horses. The median time needed to perform all the injections was 263 s. Increased adiposity (retroperitoneal fat) was associated with unsuccessful injections. This approach to the TAP was easily and quickly performed, though less successful in horses with increased retroperitoneal fat and increased BCS.
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Affiliation(s)
- Maia R. Aitken
- Department of Clinical Studies—New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348, USA
| | - Dario A. Floriano
- Department of Clinical Science and Advanced Medicine—Matthew J. Ryan Hospital, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Klaus Hopster
- Department of Clinical Studies—New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348, USA
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