Daily Anesthesiology Research Analysis
Analyzed 87 papers and selected 3 impactful papers.
Summary
Top anesthesia research today spans clinical trials and mechanistic science: a randomized, double-blind BJA trial suggests lateral quadratus lumborum block (with or without intrathecal morphine) improves early post–Cesarean pain control versus intrathecal morphine alone. A mechanistic Anesthesia & Analgesia study reveals intergenerational, male-specific neurobehavioral effects of paternal sevoflurane exposure mediated by hippocampal androgen/estrogen signaling. A randomized trial in The Clinical Journal of Pain shows PENG block provides faster early analgesia than femoral nerve block in hip fracture but with shorter duration and greater rescue requirements.
Research Themes
- Optimizing obstetric analgesia: QLB versus intrathecal morphine after Cesarean
- Intergenerational neurotoxicity mechanisms of anesthetic exposure
- Regional anesthesia strategy in hip fracture: PENG versus femoral nerve block
Selected Articles
1. Comparison of intrathecal morphine, lateral quadratus lumborum block, and their combination for analgesia and quality of recovery after Caesarean delivery: a randomised, double-blind, two-centre clinical trial.
In a two-centre, randomized, double-blind trial (n=58), lateral QLB reduced 6-hour resting pain versus intrathecal morphine, and ITM+QLB further reduced early resting/coughing pain and worst pain at 24 hours compared with ITM alone. QoR-40 noninferiority of QLB vs ITM at 24 h was inconclusive; opioid consumption and PONV were similar, while pruritus was more frequent but mild with QLB-containing regimens.
Impact: Provides randomized, double-blind evidence informing the trade-offs between neuraxial opioids and abdominal wall blocks for Cesarean analgesia, highlighting additive early analgesic benefit of combining QLB with intrathecal morphine.
Clinical Implications: Consider adding lateral QLB to intrathecal morphine for enhanced early analgesia after Cesarean while monitoring for mild pruritus; QLB alone may be an alternative when neuraxial opioids are contraindicated, though effects on overall recovery remain uncertain.
Key Findings
- QLB reduced 6-hour resting pain versus intrathecal morphine (mean difference 2.9; P<0.001).
- ITM+QLB further reduced 6-hour resting and coughing pain and worst pain at 24 h compared with ITM alone.
- Noninferiority of QLB vs ITM for QoR-40 at 24 h was inconclusive.
- Opioid consumption and nausea/vomiting were similar; pruritus was more frequent with QLB-containing regimens.
Methodological Strengths
- Randomized, double-blind, placebo-controlled, two-centre design with registered protocol
- Predefined primary (QoR-40) and secondary pain-related outcomes
Limitations
- Small sample size (n=58) limits power, particularly for noninferiority conclusions
- Outcomes assessed primarily within 24 hours, limiting longer-term inference
Future Directions: Larger multicentre RCTs comparing QLB variants and dosing, with longer follow-up and patient-centred outcomes (e.g., breastfeeding, mobility), and cost-effectiveness analyses.
BACKGROUND: Lateral quadratus lumborum block (QLB) is a potential alternative to intrathecal morphine (ITM) for analgesia after Caesarean delivery. We compared quality of recovery (QoR) and analgesia with lateral QLB, ITM, or ITM+QLB. METHODS: In this randomised, double-blind, placebo-controlled trial, women undergoing Caesarean delivery under spinal anaesthesia were allocated to (1) bilateral lateral QLB with 20 ml 0.5% ropivacaine; (2) 100 μg preservative-free ITM with sham QLB; or (3) ITM+QLB. The primary outcome was the QoR-40 score at 24 h. Secondary outcomes included pain scores, opioid consumption, and adverse effects. Given three-group comparisons, statistical significance was set at P<0.017. RESULTS: Fifty-eight women were analysed. Noninferiority testing for QoR-40 at 24 h between ITM and QLB was inconclusive (mean difference -0.9; 90% confidence interval [CI] -0.9 to 13.5). QLB reduced the resting pain score at 6 h compared with ITM (mean difference 2.9 [95% CI 1.3, 4.5]; P<0.001). Compared with ITM alone, ITM+QLB reduced the resting pain at 6 h (mean difference 3.3 [1.9, 4.8]; P<0.001), coughing pain at 6 h (3.0 [1.4, 4.7]; P<0.001), and worst pain at 24 h (1.8 [0.6, 3.1]; P=0.006). Oxycodone consumption and nausea or vomiting did not differ between groups. Pruritus was more frequent with QLB and ITM+QLB compared with ITM alone but was predominantly mild. CONCLUSIONS: Noninferiority of QLB vs ITM for QoR-40 at 24 h was inconclusive. However, QLB reduced early resting pain vs ITM, whereas ITM+QLB further reduced early resting and coughing pain and worst pain at 24 h vs ITM alone. Larger trials are needed to confirm these findings. CLINICAL TRIAL REGISTRATION: NCT02871713 (https://clinicaltrials.gov/study/NCT02871713).
2. Brain Sex Steroid-Mediated Intergenerational Sex-Specific Neurocognitive Effects of Paternal Sevoflurane Exposure in Rats.
Paternal preconception sevoflurane exposure increased hippocampal testosterone and estradiol and upregulated steroidogenic enzymes in male offspring at birth, without altering serum testosterone or steroid receptor mRNA. Perinatal blockade of androgen or estrogen pathways mitigated stress/inflammation markers and rescued multiple adult behavioral deficits, implicating brain-derived sex steroid signaling in male-biased intergenerational neurotoxicity.
Impact: Provides a mechanistic, sex-specific pathway linking paternal anesthetic exposure to offspring neurobehavioral outcomes via hippocampal sex steroid signaling, highlighting a novel dimension of anesthetic safety science.
Clinical Implications: While preclinical, the study raises awareness that paternal anesthetic exposures might have intergenerational effects, warranting further translational research and consideration in exposure risk assessments.
Key Findings
- Male offspring of sevoflurane-exposed sires had increased hippocampal testosterone and estradiol at birth with upregulated 17β-HSD and aromatase mRNA.
- Serum testosterone and hippocampal Ar/Erα/Erβ mRNA were unchanged, implicating local brain steroidogenesis.
- Perinatal AR blockade (flutamide) or estrogen pathway blockade (formestane/MPP/PHTPP) mitigated neuroinflammation and improved adult sociability, anxiety-like behavior, sensorimotor gating, and spatial memory.
- Paternal pretreatment with bumetanide or RU486 prevented these intergenerational effects.
Methodological Strengths
- Multi-pronged mechanistic design integrating exposure, pharmacologic rescue, molecular endpoints, and adult behavior
- Use of targeted AR/estrogen pathway antagonists strengthens causal inference
Limitations
- Preclinical rodent model limits direct clinical generalizability
- Complex sample structure with varying group sizes complicates effect size extrapolation
Future Directions: Translational studies to assess epigenetic and steroidogenic signatures in human cohorts, dose–response of anesthetic exposure, and potential mitigating strategies.
BACKGROUND: The biological basis for the male-biased prevalence of many neurodevelopmental disorders remains poorly understood. We found that preconception exposure of male rats to sevoflurane induces persistent dysregulation of stress and inflammatory signaling, while their offspring, almost exclusively males, develop neurobehavioral abnormalities. These effects in both generations are prevented by paternal pretreatment with either the Na+/K+/2Cl- cotransporter inhibitor bumetanide or the glucocorticoid receptor antagonist RU486. Using offspring from the same treatment groups, we tested the hypothesis that dysregulation of male-specific, sex hormone-dependent brain masculinization processes during the perinatal critical period contributes to the observed male-biased abnormalities. METHODS: Sprague-Dawley F0 males were exposed to 2.1% sevoflurane for 3 hours on postnatal days (P) 56, 58, and 60. Subsets received bumetanide or RU486 30 minutes before each exposure. On P90, F0 males were mated to generate F1 offspring. On P0-P1, F1 males of sevoflurane-exposed sires received the androgen receptor (AR) antagonist flutamide, the estradiol (E2) synthesis inhibitor formestane, the estrogen receptor α (ERα) antagonist 1,3-Bis(4-hydroxyphenyl)-4-methyl-5-[4-(2-piperidinylethoxy)phenol]-1H-pyrazole dihydrochloride (MPP), or the estrogen receptor β (ERβ) antagonist 4-[2-Phenyl-5,7-bis(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-3-yl]phenol (PHTPP) (n = 18/group). Sex steroid concentrations and hippocampal mRNA expression of enzymes and receptors involved in brain masculinization were measured in P0 F1 males from control sires (F1M_C), sevoflurane-exposed sires (F1M_S), or sires pretreated with bumetanide (F1M_BS) or RU486 (F1M_RS) (n = 6-8/group). Behavioral and stress-responsivity outcomes were assessed in adulthood. RESULTS: Compared with F1M_C, P0 F1M_S exhibited increased hippocampal testosterone (mean ± standard error of the mean [SEM]: 1.979 ± 0.527 vs 0.524 ± 0.122 ng/mg; P = .008) and E2 levels (10.997 ± 3.756 vs 2.793 ± 0.719 ng/mg; P = .027). Hippocampal mRNA expression of the testosterone-synthesizing enzyme 17β-hydroxysteroid dehydrogenase (1.629 ± 0.135 vs 1.000 ± 0.066; P = .001) and the E2-synthesizing enzyme aromatase (1.617 ± 0.093 vs 1.000 ± 0.070; P = .001) was also increased. In contrast, serum testosterone levels and hippocampal Ar, Erα, and Erβ mRNA expression were unchanged. F1M_BS and F1M_RS did not differ from F1M_C in any of these measures. Perinatal flutamide treatment reduced stress and neuroinflammatory markers and improved sociability, anxiety-like behavior, sensorimotor gating, and spatial memory in adulthood. Formestane normalized inflammatory and behavioral abnormalities; MPP improved sociability and spatial memory; and PHTPP improved spatial memory only. CONCLUSIONS: These findings suggest that male-specific neurodevelopmental abnormalities following paternal preconception sevoflurane exposure arise from stress- and inflammation-programmed increases in brain-derived testosterone during the critical brain masculinization period, involving both AR and E2 signaling.
3. Pericapsular Nerve Group Block Versus Femoral Nerve Block for Analgesia in Newly Admitted Patients With Hip Fractures: A Randomized Controlled Trial.
In 60 randomized hip-fracture patients, PENG provided superior early analgesia (lower VAS at 30 min) and faster ultrasound imaging than femoral nerve block, but analgesic effects waned by 12 h with earlier and greater need for rescue analgesics over 24 h. Procedure duration, vital signs, and recovery quality were similar.
Impact: Directly informs preoperative regional analgesia selection in hip fracture, clarifying that PENG offers faster early relief but shorter duration compared with femoral nerve block.
Clinical Implications: Consider PENG for rapid early analgesia and ease of ultrasound imaging in hip fracture, paired with scheduled adjunct analgesia to offset shorter duration; FNB may be preferable when longer-lasting single-shot analgesia is prioritized.
Key Findings
- At 30 min, PENG yielded lower resting and passive movement VAS versus femoral nerve block (P=0.020 and P=0.027).
- At 12 h, pain scores were higher with PENG at rest and with movement (P=0.006 and P=0.002).
- PENG achieved optimal ultrasound imaging faster and required earlier and greater 24-h rescue analgesia.
- No differences in procedure duration, vital signs, or recovery quality were observed.
Methodological Strengths
- Randomized allocation with prespecified primary and secondary endpoints
- Direct head-to-head comparison in a clinically homogeneous population (newly admitted hip fractures)
Limitations
- Modest sample size (n=60) limits precision and subgroup analyses
- Single-shot techniques; no assessment of continuous catheter strategies or adjunct adjuvants
Future Directions: Evaluate multimodal strategies combining PENG with scheduled systemic analgesia, continuous catheter techniques, or adjuvants to extend duration; assess delirium, mobility, and time-to-surgery outcomes.
OBJECTIVES: To compare the effects of preoperative pericapsular nerve group (PENG) block versus femoral nerve block (FNB) on pain in patients with hip fractures. METHODS: Sixty eligible patients were randomized (1:1) to receive PENG block or FNB. The primary endpoint was post-block pain assessed via Visual Analogue Scale (VAS). Secondary endpoints included time to optimal ultrasound imaging, procedure duration, time to first rescue analgesic, 24-hour rescue analgesic consumption, postoperative recovery quality, vital signs, and adverse events. RESULTS: At 30 minutes post-block, both resting VAS scores (0.0 [0.0, 1.2] vs. 1.1 [0.6, 1.8], P=0.020) and passive movement VAS scores (2.9 [1.7, 3.6] vs. 3.4 [2.7, 4.7], P=0.027) were significantly lower in the PENG group compared with the FNB group. At 12 hours post-block, resting VAS (3.0 [2.1, 4.0] vs. 2.3 [1.7, 2.6], P=0.006) and passive movement VAS (6.8 [5.1, 7.3] vs. 4.9 [4.1, 5.8], P=0.002) were higher in the PENG group. The PENG group achieved optimal ultrasound imaging faster, had an earlier time to first rescue analgesic, and required a greater total dose of rescue analgesics within 24 hours (all P <0.001). Procedure duration, vital signs, and recovery quality did not differ significantly. DISCUSSION: PENG blocks outperform FNB in imaging speed and early pain control but yield a shorter block duration, thereby increasing 24-hour rescue analgesic demands.