Short CPR Duration Linked to Better Outcomes With Low-Temperature Management

A retrospective registry study published in the European Journal of Medical Research has identified a potential interaction between the duration of cardiopulmonary resuscitation (CPR) and the neurological outcomes associated with targeted temperature management (TTM) after cardiac arrest. The research, led by Wei-ling Kang and colleagues, examined whether the relationship between low-temperature TTM and patient recovery varied depending on how long resuscitation efforts lasted. The study utilized data from a Taiwanese registry, focusing on patients who underwent TTM following cardiac arrest. The primary objective was to determine if the timing of resuscitation influenced the efficacy of temperature management strategies, specifically comparing low-temperature TTM at 33–34 °C with heterogeneous active temperature management.

The study included 433 patients, of whom 342 received low-temperature TTM and 91 received the comparator treatment. The adjusted complete-case models included 397 patients. The primary outcomes measured were in-hospital mortality and unfavorable neurological outcome, defined as a Cerebral Performance Category (CPC) score of 3–5. Good neurological recovery was defined as a CPC score of 1–2. The researchers employed propensity matching, continuous CPR-duration modeling, and 50 treatment-stratified multiple imputations to adjust for confounding variables. The ten-minute subgroup threshold was selected post hoc to explore potential differences in outcomes based on resuscitation duration.

Overall, the adjusted neurological association between low-temperature TTM and outcomes was nonsignificant, with a p-value of 0.235. Good neurological recovery occurred in 27.2% of the low-temperature TTM group versus 27.5% in the comparator group. This suggests that the effect of temperature management may depend on the length of the resuscitation effort. The interaction persisted after multiple imputation in a larger cohort of 558 patients, with a p-value of 0.007, reinforcing the robustness of this finding.

For patients whose CPR lasted ten minutes or less, the adjusted odds ratio (OR) for favorable neurological outcomes was 0.08, with a 95% confidence interval of 0.01–0.44. This indicates a strong association between low-temperature TTM and better neurological recovery in this subgroup. In contrast, for patients with CPR lasting longer than ten minutes, no significant association was observed, with an OR of 1.19 and a 95% confidence interval of 0.56–2.51. These findings suggest that the potential benefit of low-temperature TTM may be more pronounced in cases where resuscitation is relatively brief. The distinction between these two subgroups highlights the importance of considering resuscitation duration when evaluating the effectiveness of temperature management protocols.

Regarding in-hospital mortality, lower mortality was associated with low-temperature TTM, with an OR of 0.50 and a 95% confidence interval of 0.28–0.89. However, the authors noted that this finding was sensitive to model specification, indicating that the relationship between TTM and mortality may be influenced by other factors. The study’s conclusions suggest that low-temperature TTM may be associated with better neurological outcomes in patients whose CPR duration was ten minutes or less. Nevertheless, the authors emphasize that this finding requires external validation to confirm its generalizability. The study was registered on ClinicalTrials.gov under the identifier NCT03578328, registered on 6 July 2018.

The methodology of the study involved a retrospective analysis of registry data, which allows for the examination of large patient populations but is subject to limitations inherent in observational studies. The use of propensity matching and multiple imputations helped to mitigate bias and handle missing data, respectively. The post hoc selection of the ten-minute threshold requires careful interpretation, as it was not pre-specified in the study design. Despite these limitations, the study provides valuable insights into the potential interaction between CPR duration and TTM efficacy.

The comparable rates of good neurological recovery in the overall cohort suggest that, on average, low-temperature TTM did not significantly improve outcomes. However, the subgroup analysis reveals a potential benefit in patients with shorter CPR durations.

The authors highlight the importance of external validation for their findings, acknowledging that retrospective registry studies may not capture all relevant variables or account for unmeasured confounders. The authors state that this finding requires external validation. However, given the observational nature of the study and the post hoc analysis, these findings should be interpreted with caution.

Subject of Research: Temperature management and outcomes after cardiac arrest: a retrospective registry study

Article Title: Temperature management and outcomes after cardiac arrest: a retrospective registry study

Article References: Kang, W.-L., Tsai, M.-S., Kuo, L.-K., Wang, C.-H., Sheu, C.-C., Wu, C.-Y., Wu, S.-N., Chan, L., Wang, A.-Y., & Chang, S.-N. (2026). Temperature management and outcomes after cardiac arrest: a retrospective registry study. European Journal of Medical Research. https://doi.org/10.1186/s40001-026-05382-w

Image Credits: AI Generated

DOI: 10.1186/s40001-026-05382-w

Keywords: Temperature, management, outcomes, cardiac, arrest, retrospective, registry, scientific research