Transversus Abdominis Plane (TAP) and Rectus Sheath Blocks: a Technical Description and Evidence Review
Bibliographic record
Abstract
This article aims to review the anatomy relevant to the ultrasound techniques of the transversus abdominis plane (TAP) block and rectus sheath block (RSB). We discuss their analgesic efficacy for various surgical procedures, both as single shot and as a continuous infusion via catheters. RSB provides superior analgesia to local infiltration and has an opioid-sparing effect for umbilical surgery, laparotomy, and laparoscopic surgery. There is no high-quality evidence comparing RSB with epidural analgesia. Intermittent bolus through catheters appears to be more effective than continuous infusion for prolonged analgesia. Similarly, ultrasound-guided TAP block provides postoperative analgesic benefit after abdominal laparotomy or laparoscopy and cesarean delivery when long-acting neuraxial opioids are not used or contraindicated. Adding adjuvant such as dexamethasone and dexmedetomidine to local anesthetic prolongs the duration of TAP and RSB blocks and improves their efficacy. Use of ultrasound guidance makes the RSB and TAP blocks more reliable. Single-shot infiltration is useful for less extensive surgical procedures, while catheters are a useful alternative when thoracic epidural analgesia is contraindicated.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.007 | 0.005 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".