Trial reportBMC anesthesiology2025
Optimizing the superior trunk block for arthroscopic shoulder surgery: a randomized, double-blind comparison of low- vs. conventional-dose ropivacaine on anesthesia, analgesia, and diaphragmatic function.
Trial report in BMC anesthesiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
2 citing papers in PubMed.
- Minimum Effective Volume of 0.25% Ropivacaine for Ultrasound-Guided Superior Trunk Block with Dexmedetomidine Sedation in Shoulder Arthroscopy: A Biased Coin Up-and-Down Trial.Drug design, development and therapy · 2026Trial
- Shoulder Surgery Under Regional Anesthesia With Sedation Without General Anesthesia: A Case Series.Cureus · 2026Article
Corrections and comments
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Authors and funding
8 authors.
Funding
Abstract
backgroundThe superior trunk block (STB) has been proposed as an alternative to interscalene block for reducing the risk of hemidiaphragmatic paralysis (HDP) while maintaining adequate analgesia. However, the optimal local anesthetic dosage for STB has not been established. This study aimed to evaluate whether a low dose of ropivacaine could effectively provide surgical anesthesia, reduce the incidence of complete and partial HDP, and improve anesthetic safety and patient comfort during shoulder arthroscopy.
methodsEighty-eight patients scheduled for shoulder arthroscopy were enrolled and randomly allocated in a 1:1 ratio to either a low-dose group (LD group; 10 mL of 0.25% ropivacaine) or a conventional-dose group (CD group; 15 mL of 0.5% ropivacaine). The primary outcome was the incidence of HDP assessed at 3 h post-block. Secondary outcomes included rates of successful surgical anesthesia, pain scores, opioid consumption, duration and onset time of the block, handgrip strength, and patient satisfaction.
resultsThe incidence of complete and partial HDP at 3 h post-STB was significantly lower in the LD group than in the CD group (31.8% vs. 84.1%, p < 0.001), with an absolute risk reduction of 52.3% (95% CI: 34.8% to 69.8%). All patients in both groups successfully underwent surgery without conversion to general anesthesia with tracheal intubation or requiring supplemental intraoperative analgesia. The overall patient satisfaction score was significantly higher in the LD group compared to the CD group (p = 0.003). However, patients in the LD group reported higher pain scores at 12 h post-block (p = 0.044), exhibited a shorter duration of sensory block (p = 0.001) compared to the CD group.
conclusionsThese findings indicate that a low-dose ropivacaine regimen (10 mL of 0.25%) for STB significantly reduces the incidence of HDP while still providing sufficient surgical anesthesia. However, this approach may be associated with reduced efficacy in postoperative analgesia.
trial registrationThis trial was registered at the Chinese Clinical Trial Registry (No. ChiCTR2000036608).
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