Comparative Effectiveness of Continuous Intra-Operative Suprascapular Nerve Block (CI-SSNB) with and Without Intravenous Patient-Controlled Analgesia (IV-PCA) on Acute Post-Arthroscopy Pain: A Retrospective Cohort Study.

In particular, the borderline significance observed at the immediate post-operative interval ( p = 0.050) may have been influenced not only by the residual analgesic effect of the single-shot interscalene block (ISB), which typically provides pain relief for 12–24 h, but also by several additional factors.

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Although the mean body mass index was slightly lower in the CI-SSNB + IV-PCA group (24.2 ± 6.5 kg/m 2 ) compared to the CI-SSNB group (27.3 ± 2.8 kg/m 2 ), the difference did not reach statistical significance ( p = 0.060).

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Together, these factors could explain the near-significant finding at this early time point.

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