Re: Timing of planned reoperation after damage control surgery in patients with trauma—confounding by indication, physiological readiness, and the limits of clock-based thresholds

Abstract

Background

Seo and colleagues compared early (≤ 48 h) versus delayed (> 48 h) planned reoperation following damage control surgery (DCS) in trauma patients and reported higher rates of re-bleeding in the early reoperation group. While this addresses an important clinical question, interpretation of these findings requires caution.

Main points

First, all included studies were observational, and reoperation timing was determined by clinical judgment, introducing systematic confounding by indication. Physiologically unstable patients are more likely to undergo early re-exploration, while more stable patients are deferred, particularly in resource-constrained settings where system-level triage further shapes timing decisions. Second, the use of a 48-hour cut-off imposes a binary framework on what is inherently a continuous biological process, as physiological recovery varies substantially between patients, injury patterns, and operative burden. Third, pooling heterogeneous DCS indications, including haemorrhage- and contamination-driven strategies, limits the biological plausibility of a single time-based reoperation algorithm across diverse clinical contexts.

Conclusion

Taken together, the available evidence suggests that timing is not the true causal exposure; rather, physiological readiness is the key determinant of outcomes after DCS. Future research should shift from clock-based thresholds to physiology-guided frameworks using objective markers of recovery to better inform reoperation strategies in trauma care.

Dear editors

We read with interest the systematic review and meta-analysis by Seo et al. evaluating early (≤ 48 h) versus delayed (> 48 h) planned reoperation following damage control surgery (DCS) in patients with trauma [1]. The authors address a clinically important and longstanding question in trauma care, and the synthesis of available evidence represents a valuable contribution to a limited literature base.

This correspondence aims to highlight conceptual and methodological considerations that may assist clinicians in interpreting the findings and help guide future research in this area.

Confounding by indication: timing is not the exposure—physiology is

All included studies were observational, and reoperation timing was determined by clinical judgment rather than randomisation [1]. This introduces systematic confounding by indication, whereby patients who are physiologically unstable are preferentially taken back earlier, while those who stabilise undergo delayed reoperation. In resource-constrained settings, this effect may be further amplified by system-level triage, whereby clinically stable patients are deferred because of operating theatre and intensive care prioritisation, while unstable patients undergo early re-exploration out of necessity rather than optimal timing [2]. Consequently, the observed association between early reoperation and increased re-bleeding likely reflects a combination of biological severity and health system dynamics, rather than a harmful causal effect of early timing itself. In this context, timing functions as a surrogate marker for physiological readiness, not as an independent exposure.

Arbitrary time thresholds: biological recovery is continuous, not binary

The use of a 48-hour cut-off, although pragmatic and consistent with current guidelines, imposes a binary framework on what is inherently a continuous biological process [1,3]. Physiological recovery varies substantially between patients, injury patterns, and surgical burden, and cannot be reliably inferred from elapsed time alone. A rigid clock-based interpretation therefore risks oversimplifying trauma decision-making and obscuring the more clinically meaningful question: not when to reoperate, but when the patient is physiologically ready.

Heterogeneity of DCS indications: one algorithm for multiple pathologies

The meta-analysis pools diverse clinical scenarios, including hepatic packing, pelvic packing, blunt and penetrating trauma, and contamination-related DCS, despite substantial differences in underlying pathophysiology [1,2,4]. The determinants of optimal reoperation timing in haemorrhage-driven DCS differ fundamentally from those in contamination-driven strategies, limiting the biological plausibility of a single time-based algorithm across heterogeneous patient populations.

Clinical implications and future directions

Interpreting these findings as evidence that delayed reoperation is intrinsically safer risks guideline creep from low-certainty observational data [2,3]. A more cautious interpretation is that patients who are not physiologically optimised should not be re-explored, regardless of elapsed time. Future studies should therefore shift from clock-based thresholds to physiology-guided frameworks incorporating objective markers such as lactate clearance, viscoelastic coagulation profiles, vasopressor requirements, and temperature normalisation [3,5].

Taken together, the study by Seo et al. highlights not merely a question of timing, but a deeper unresolved issue in trauma care: the absence of operationalised physiological criteria for readiness for reoperation after DCS. Addressing this gap may ultimately prove more clinically meaningful than refining time thresholds alone.

Sincerely,

Vukosi Baloyi.

Emmanuel Ndaba.

Abbreviations

DCS

Damage control surgery

Author contributions

VB conceived and drafted the manuscript. EN revised the manuscript. Both authors approved the final version.

Funding

None.

Data availability

No datasets were generated or analysed during the current study.

Declarations

Ethics approval and consent to participate

Not applicable.

Consent for publication

Not applicable.

Competing interests

The authors declare no competing interests.