Weekly Anesthesiology Research Analysis
This week’s anesthesiology literature emphasizes practical shifts in perioperative care: a high-quality pediatric RCT challenges routine use of TAP blocks when multimodal analgesia is applied; a randomized trial shows sugammadex reduces postoperative urinary retention after laparoscopic cholecystectomy, supporting agent choice to facilitate same-day discharge; and simultaneous EEG–SEEG mechanistic work redefines alpha sub-band biomarkers tied to anesthetic loss of consciousness, informing next-g
Summary
This week’s anesthesiology literature emphasizes practical shifts in perioperative care: a high-quality pediatric RCT challenges routine use of TAP blocks when multimodal analgesia is applied; a randomized trial shows sugammadex reduces postoperative urinary retention after laparoscopic cholecystectomy, supporting agent choice to facilitate same-day discharge; and simultaneous EEG–SEEG mechanistic work redefines alpha sub-band biomarkers tied to anesthetic loss of consciousness, informing next-generation depth-of-anesthesia monitoring.
Selected Articles
1. Clinical effectiveness of transversus abdominis plane block versus local anaesthesia wound infiltration for postoperative pain relief after laparoscopic appendicectomy in children: A multicentre, double-blind, randomised, controlled phase III trial.
In a multicenter double-blind phase III RCT (n=96), ultrasound-guided TAP block did not reduce 24-hour nalbuphine consumption versus local anesthetic wound infiltration when both groups received standardized multimodal analgesia. FLACC pain scores and time to rescue analgesia or mobilization were similar, challenging routine TAP use in this context.
Impact: High-quality, pragmatic evidence directly questions routine TAP block use for pediatric laparoscopic appendectomy within multimodal analgesia pathways, with immediate implications for workflow, resource use, and risk–benefit decisions.
Clinical Implications: For pediatric laparoscopic appendectomy with standardized multimodal analgesia, favor local wound infiltration over TAP block to streamline procedures without sacrificing analgesia; reassess analgesic pathways and training/resource allocation accordingly.
Key Findings
- No difference in total nalbuphine dose within 24 hours between TAP and wound infiltration groups (median 0.2 mg/kg each; P=0.95).
- FLACC scores at 1–24 hours postoperatively did not differ (P=0.78).
- Times to first opioid rescue and first mobilization were similar between groups.
2. Postoperative Urinary Retention After Reversal of Neuromuscular Block by Neostigmine versus Sugammadex in Patients Undergoing Laparoscopic Cholecystectomy: A Randomized Controlled Trial.
In 235 randomized patients having laparoscopic cholecystectomy with rocuronium-based anesthesia, reversal with sugammadex (2 mg/kg) significantly reduced postoperative urinary retention compared with neostigmine plus glycopyrrolate using ultrasound-based bladder criteria; no major adverse events reported.
Impact: First prospective RCT to compare reversal agents on POUR in a common ambulatory procedure—provides actionable evidence favoring sugammadex to improve discharge readiness and reduce unplanned admissions.
Clinical Implications: Consider routine use of sugammadex for neuromuscular blockade reversal in laparoscopic cholecystectomy where POUR risk is a barrier to same-day discharge; incorporate bladder ultrasound protocols within ERAS workflows.
Key Findings
- Sugammadex reduced the incidence of postoperative urinary retention by an absolute 12.8% versus neostigmine (P < .001).
- Objective POUR criteria included inability to void with bladder volume ≥300 mL, post-void residual ≥200 mL, or need for catheterization.
- No major adverse events reported in either group.
3. Distinct origins of human low and high alpha rhythms revealed by simultaneous EEG-SEEG.
Simultaneous intracranial SEEG and scalp EEG recordings show a state-dependent shift from occipital low-alpha (8–10 Hz) during eyes-closed wakefulness to a globally distributed high-alpha (10–13 Hz) at anesthetic-induced loss of consciousness. Changes are driven by periodic components and are reproducible with a simple dynamical model, redefining alpha-band biomarkers relevant to anesthetic depth.
Impact: Provides mechanistic, human intracranial evidence distinguishing alpha sub-band generators and their anesthetic modulation—key for refining EEG-based depth-of-anesthesia metrics and improving monitoring specificity.
Clinical Implications: Inform development of next-generation EEG monitors that separate low- and high-alpha activity to better track transitions in consciousness and reduce risk of intraoperative awareness; provides targets for signal-processing and device validation.
Key Findings
- Occipital low-alpha (8–10 Hz) dominates during eyes-closed wakefulness and diminishes with increasing anesthetic depth.
- A globally distributed high-alpha (10–13 Hz) emerges at anesthetic-induced loss of consciousness, replacing low-alpha.
- Alpha-band shifts are driven by periodic activity changes rather than aperiodic 1/f components and are captured by a simple dynamical model.