William Emmett Swanton, Neil Christensen, Carrie Schroeder
{"title":"根据计算机断层扫描的评估，直肠鞘阻滞导致头颅-尾椎方向的扩散更大，而腹横肌平面阻滞导致狗的侧向扩散更大。","authors":"William Emmett Swanton, Neil Christensen, Carrie Schroeder","doi":"10.2460/ajvr.24.04.0106","DOIUrl":null,"url":null,"abstract":"<p><strong>Objective: </strong>To evaluate the in vivo spread of iodinated contrast following injections in the transversus abdominis plane (TAP) and rectus sheath in anesthetized dogs via computed tomography. Secondarily, the time of performing each block was compared.</p><p><strong>Animals: </strong>6 adult, purpose-bred Beagles.</p><p><strong>Methods: </strong>In a prospective crossover study, dogs were administered injections either in the rectus sheath or transversus abdominis fascial plane in the same manner as a rectus sheath block (RSB) or TAP block using dilute iodinated contrast. Computed tomography scans were performed immediately following injection (time [T]-0) and at 3, 9, 18, and 30 minutes postinjection. Data regarding the spread in the cranial-caudal and lateral directions and time to perform the injections were compared between the 2 techniques using paired or 2-sample t tests.</p><p><strong>Results: </strong>There was significantly greater spread in the cranial-caudal direction in the RSB group (62.9 ± 6.4 mm vs 54.8 ± 6.8 mm at T30; P = .009), whereas spread in the lateral direction was greater in the TAP group (37.3 ± 3.0 mm vs 48.6 ± 6.1 mm at T30; P < .0001). The RSB injection was performed in a more time-efficient manner than TAP injection (48.2 ± 3.2 seconds vs 82.3 ± 8.7 seconds; P = .03).</p><p><strong>Conclusions: </strong>In living subjects, RSB injections resulted in greater cranial-caudal spread while TAP injections resulted in greater lateral spread. Rectus sheath block injections were performed in a more time efficient manner compared to a single point TAP injection in anesthetized dogs.</p><p><strong>Clinical relevance: </strong>The RSB was performed in a more time-efficient manner and would likely result in greater coverage of the ventral midline. The TAP block would likely result in more significant regional anesthetic coverage of the lateral abdominal wall. Further studies are required to determine the degree of the clinical significance of these results.</p>","PeriodicalId":7754,"journal":{"name":"American journal of veterinary research","volume":" ","pages":""},"PeriodicalIF":1.3000,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Rectus sheath block results in greater cranial-caudal spread whereas transversus abdominis plane block results in greater lateral spread as assessed by computed tomography in dogs.\",\"authors\":\"William Emmett Swanton, Neil Christensen, Carrie Schroeder\",\"doi\":\"10.2460/ajvr.24.04.0106\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Objective: </strong>To evaluate the in vivo spread of iodinated contrast following injections in the transversus abdominis plane (TAP) and rectus sheath in anesthetized dogs via computed tomography. Secondarily, the time of performing each block was compared.</p><p><strong>Animals: </strong>6 adult, purpose-bred Beagles.</p><p><strong>Methods: </strong>In a prospective crossover study, dogs were administered injections either in the rectus sheath or transversus abdominis fascial plane in the same manner as a rectus sheath block (RSB) or TAP block using dilute iodinated contrast. Computed tomography scans were performed immediately following injection (time [T]-0) and at 3, 9, 18, and 30 minutes postinjection. Data regarding the spread in the cranial-caudal and lateral directions and time to perform the injections were compared between the 2 techniques using paired or 2-sample t tests.</p><p><strong>Results: </strong>There was significantly greater spread in the cranial-caudal direction in the RSB group (62.9 ± 6.4 mm vs 54.8 ± 6.8 mm at T30; P = .009), whereas spread in the lateral direction was greater in the TAP group (37.3 ± 3.0 mm vs 48.6 ± 6.1 mm at T30; P < .0001). The RSB injection was performed in a more time-efficient manner than TAP injection (48.2 ± 3.2 seconds vs 82.3 ± 8.7 seconds; P = .03).</p><p><strong>Conclusions: </strong>In living subjects, RSB injections resulted in greater cranial-caudal spread while TAP injections resulted in greater lateral spread. Rectus sheath block injections were performed in a more time efficient manner compared to a single point TAP injection in anesthetized dogs.</p><p><strong>Clinical relevance: </strong>The RSB was performed in a more time-efficient manner and would likely result in greater coverage of the ventral midline. The TAP block would likely result in more significant regional anesthetic coverage of the lateral abdominal wall. 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引用次数: 0
摘要
目的通过计算机断层扫描评估碘对比剂在麻醉犬腹横肌平面（TAP）和直肌鞘注射后的体内扩散情况。动物：6 只专门饲养的成年比格犬：在一项前瞻性交叉研究中，使用稀释的碘化造影剂，以与直肠鞘阻滞（RSB）或 TAP 阻滞相同的方式，在犬的直肠鞘或腹横肌筋膜平面进行注射。注射后（时间 [T]-0）立即进行计算机断层扫描，并在注射后 3、9、18 和 30 分钟进行扫描。使用配对或双样本 t 检验比较了两种技术在头颅-尾椎方向和侧面的扩散数据以及注射时间：结果：RSB 组头颅-尾椎方向的扩散明显更大（T30 时为 62.9 ± 6.4 mm vs 54.8 ± 6.8 mm；P = .009），而 TAP 组外侧方向的扩散更大（T30 时为 37.3 ± 3.0 mm vs 48.6 ± 6.1 mm；P < .0001）。RSB 注射比 TAP 注射更省时（48.2 ± 3.2 秒 vs 82.3 ± 8.7 秒；P = .03）：结论：在活体受试者中，RSB 注射会导致更大的头颅-尾部扩散，而 TAP 注射会导致更大的侧向扩散。在麻醉狗身上，直肌鞘阻滞注射比单点 TAP 注射更省时：临床相关性：RSB 以更省时的方式进行，可能会更大程度地覆盖腹侧中线。TAP 阻滞可能会对腹侧壁造成更显著的区域麻醉覆盖。要确定这些结果的临床意义，还需要进一步的研究。
Rectus sheath block results in greater cranial-caudal spread whereas transversus abdominis plane block results in greater lateral spread as assessed by computed tomography in dogs.
Objective: To evaluate the in vivo spread of iodinated contrast following injections in the transversus abdominis plane (TAP) and rectus sheath in anesthetized dogs via computed tomography. Secondarily, the time of performing each block was compared.
Animals: 6 adult, purpose-bred Beagles.
Methods: In a prospective crossover study, dogs were administered injections either in the rectus sheath or transversus abdominis fascial plane in the same manner as a rectus sheath block (RSB) or TAP block using dilute iodinated contrast. Computed tomography scans were performed immediately following injection (time [T]-0) and at 3, 9, 18, and 30 minutes postinjection. Data regarding the spread in the cranial-caudal and lateral directions and time to perform the injections were compared between the 2 techniques using paired or 2-sample t tests.
Results: There was significantly greater spread in the cranial-caudal direction in the RSB group (62.9 ± 6.4 mm vs 54.8 ± 6.8 mm at T30; P = .009), whereas spread in the lateral direction was greater in the TAP group (37.3 ± 3.0 mm vs 48.6 ± 6.1 mm at T30; P < .0001). The RSB injection was performed in a more time-efficient manner than TAP injection (48.2 ± 3.2 seconds vs 82.3 ± 8.7 seconds; P = .03).
Conclusions: In living subjects, RSB injections resulted in greater cranial-caudal spread while TAP injections resulted in greater lateral spread. Rectus sheath block injections were performed in a more time efficient manner compared to a single point TAP injection in anesthetized dogs.
Clinical relevance: The RSB was performed in a more time-efficient manner and would likely result in greater coverage of the ventral midline. The TAP block would likely result in more significant regional anesthetic coverage of the lateral abdominal wall. Further studies are required to determine the degree of the clinical significance of these results.
期刊介绍：
The American Journal of Veterinary Research supports the collaborative exchange of information between researchers and clinicians by publishing novel research findings that bridge the gulf between basic research and clinical practice or that help to translate laboratory research and preclinical studies to the development of clinical trials and clinical practice. The journal welcomes submission of high-quality original studies and review articles in a wide range of scientific fields, including anatomy, anesthesiology, animal welfare, behavior, epidemiology, genetics, heredity, infectious disease, molecular biology, oncology, pharmacology, pathogenic mechanisms, physiology, surgery, theriogenology, toxicology, and vaccinology. Species of interest include production animals, companion animals, equids, exotic animals, birds, reptiles, and wild and marine animals. Reports of laboratory animal studies and studies involving the use of animals as experimental models of human diseases are considered only when the study results are of demonstrable benefit to the species used in the research or to another species of veterinary interest. Other fields of interest or animals species are not necessarily excluded from consideration, but such reports must focus on novel research findings. Submitted papers must make an original and substantial contribution to the veterinary medicine knowledge base; preliminary studies are not appropriate.
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