Costoclavicular Nerve Block Shows Faster Onset Than Infraclavicular Block in Upper Limb Surgeries

This meta-analysis and systematic review examined the comparative analgesic efficacy of two regional anesthesia techniques for upper limb surgeries. The analysis pooled data from six randomized controlled trials involving a total of 434 patients undergoing various upper limb surgical procedures. The specific surgical settings and the exact distribution of procedures were not reported in the available data. The study aimed to provide a quantitative synthesis of evidence comparing these two established nerve block approaches.

The intervention was the costoclavicular nerve block, and the comparator was the infraclavicular nerve block. The specific local anesthetic agents, concentrations, volumes, and injection protocols used across the individual trials were not detailed in the meta-analysis results. Similarly, the precise anatomical landmarks or ultrasound-guided techniques employed for each block type were not reported. The analysis focused on comparing these two distinct anatomical approaches to brachial plexus blockade.

The primary outcome for the meta-analysis was not explicitly stated. Among the secondary outcomes analyzed, block onset time showed a statistically significant difference favoring the costoclavicular approach. The standardized mean difference (SMD) was -0.29 (95% CI = -0.53 to -0.05; P = .02), indicating a small to moderate effect size where the costoclavicular block was associated with a decreased onset time compared to the infraclavicular block. Absolute time differences in minutes were not reported.

Other key secondary outcomes showed no statistically significant differences between the two techniques. For performance time, the SMD was -0.26 (95% CI = -0.85 to 0.34; P = .40). For the number of needle passes required, the SMD was -0.08 (95% CI = -0.40 to 0.24; P = .61). Regarding complications, the odds ratio for vascular puncture was 0.25 (95% CI = 0.04 to 1.56; P = .14), and for Horner syndrome, it was 1.02 (95% CI = 0.04 to 27.64; P = .99). None of these comparisons reached statistical significance.

Detailed safety and tolerability findings were not reported. The meta-analysis did not provide specific data on adverse event rates, serious adverse events, or procedure-related discontinuations. The absence of this safety data limits the ability to perform a comprehensive risk-benefit assessment between the two nerve block techniques.

This meta-analysis contributes to the ongoing evaluation of optimal brachial plexus block techniques for upper extremity surgery. Prior landmark studies and reviews have compared various infraclavicular approaches (vertical, lateral, coracoid) to supraclavicular and axillary blocks, often focusing on success rates, onset, and complication profiles. This analysis directly compares the newer costoclavicular space block to a traditional infraclavicular approach, adding a specific data point regarding a potentially faster onset, which aligns with the anatomical rationale of depositing local anesthetic closer to the cords of the brachial plexus.

Key methodological limitations include the need for more randomized controlled trials to confirm the findings, as noted by the authors. The total sample size of 434 patients across six studies remains modest. The lack of reported data on the primary outcome, specific local anesthetic protocols, surgical types, and detailed safety profiles are significant constraints. Potential biases could arise from heterogeneity in surgical procedures, anesthetic techniques, and outcome definitions across the included RCTs.

The clinical implication is that for anesthesiologists performing regional anesthesia for upper limb surgery, the costoclavicular nerve block may offer a statistically faster onset of sensory blockade compared to the infraclavicular approach, based on this pooled analysis. However, it did not demonstrate advantages in procedural metrics like performance time or needle passes, nor did it show a difference in the reported complication rates. This information can be considered when selecting a block technique, but the decision should be individualized based on operator expertise, patient anatomy, and surgical requirements.

Several important questions remain unanswered. The impact on the quality and duration of postoperative analgesia, patient-reported outcomes, and motor block characteristics were not evaluated. The clinical relevance of the statistical difference in onset time (SMD -0.29) needs clarification in terms of actual minutes saved. Furthermore, comprehensive safety data, including rates of pneumothorax, nerve injury, and local anesthetic systemic toxicity, are needed. Finally, the optimal local anesthetic type, volume, and concentration for the costoclavicular block in this context require definition through further research.