Early investigations of deep NMB focused primarily on improving surgical exposure and operating conditions. Randomized studies have demonstrated that deeper levels of neuromuscular relaxation reduce abdominal wall tension and improve visualization during minimally invasive procedures [1,2]. These findings were subsequently consolidated by the results of meta-analyses, which confirmed superior surgical space conditions and procedural facilitation when deep NMB was used [3,4]. Collectively, this body of evidence provides a robust technical rationale for the widespread adoption of deep NMB.

However, inflammatory biomarkers have rarely been incorporated as primary endpoints in such studies in the literature. Systemic inflammatory markers are often analyzed descriptively without a unifying mechanistic or clinical framework. Consequently, the potential biological implications of deep NMB, particularly its role in modulating postoperative inflammatory signaling, remain largely speculative.

An expanding body of perioperative research has identified an association between systemic inflammation and postoperative neurological complications, including postoperative delirium and perioperative neurocognitive disorders [6,7]. Both observational studies and meta-analyses have demonstrated correlations between elevated circulating cytokine levels and adverse neurocognitive outcomes, suggesting that the perioperative inflammatory burden may increase neurological vulnerability [6–8]. Despite this conceptual overlap, previous studies on deep NMB have rarely integrated inflammatory biomarkers into the broader pathophysiological narrative.

The meta-analysis by Lee et al. [5] addressed this gap by systematically evaluating postoperative cytokine profiles according to the depth of NMB. Among the inflammatory mediators analyzed, tumor necrosis factor-α (TNF-α) levels were statistically significantly reduced in the immediate postoperative period in patients managed with deep NMB, as compared with those receiving moderate NMB. As TNF-α is a key mediator of early inflammatory signaling following surgical tissue injury, this finding suggests that deep NMB may attenuate components of the initial systemic inflammatory response [9].

In contrast, other cytokines, including interleukin-1β and interleukin-6, did not differ consistently across postoperative time points. Rather than diminishing the relevance of the findings, this pattern underscores the complexity and temporal heterogeneity of postoperative inflammatory responses and reflects the inherent limitations of the existing evidence base, which includes variability in sampling time points and the limited statistical power of individual trials.

Importantly, Lee et al. used meta-regression analyses to explore potential sources of heterogeneity, thereby strengthening the interpretability of their results. This analytical approach distinguishes the current work from earlier technically focused reviews and facilitates a more nuanced understanding of how anesthetic management may interact with biological processes perioperatively.

Nevertheless, from a clinical standpoint, the findings of this meta-analysis should be interpreted cautiously. While the observed reduction in early postoperative TNF-α levels suggests that deep NMB may influence systemic inflammatory signaling, translation of this biological modulation into meaningful clinical benefit remains uncertain. To date, evidence linking inflammatory biomarkers to outcomes such as delirium or cognitive dysfunction has predominantly been associative, and causal relationships have not been firmly established [6,7].

Furthermore, recent large-scale observational data have suggested that NMB itself, depending on the exposure and reversal strategy used, may be associated with an increased risk of postoperative delirium in older patients [10]. These observations highlight that the relationships among NMB, inflammation, and neurological outcomes are likely multifactorial and context-dependent. Consequently, any potential anti-inflammatory effects of deep NMB must be considered along with emerging data, with an emphasis on balanced neuromuscular management.

Both the current meta-analysis and the broader existing literature share important limitations. The number of available randomized trials on this topic remains limited, inflammatory biomarkers have not been measured uniformly, and postoperative sampling strategies have frequently failed to capture the critical temporal dynamics of cytokine release. Moreover, most existing studies have emphasized short-term biochemical endpoints without concurrent assessment of patient-centered outcomes, such as cognitive recovery, functional status, or quality of life.

Therefore, future research should adopt integrated study designs that simultaneously evaluate NMB depth, standardized inflammatory biomarkers, and clinically meaningful outcomes. Such investigations are essential for determining whether modulating early postoperative inflammation through anesthetic techniques could translate into durable patient benefits or merely represents a transient biological signal without long-term clinical relevance.

The meta-analysis by Lee et al. [5] represents an important step in reframing deep NMB as more than a technical tool to facilitate surgery. By demonstrating an association between deep NMB and reduced early postoperative TNF-α release, this work extends the discussion of NMB into the domains of systemic biology and perioperative inflammation. Although their findings do not support immediate changes in clinical practice, they provide a biologically plausible rationale for further mechanistic- and outcome-driven research. Their study conceptually bridges the established technical advantages of anesthesia and emerging biological considerations in anesthetic care.