Time to surgery and 30-day mortality after hip fracture: An observational study of 29,695 patients reported to the Spanish National Hip Fracture Registry (SNHFR).

INTRODUCTION

The aim of this study was to investigate the effect of time to surgery (TTS) on 30-day mortality in a cohort of patients from the Spanish National Hip Fracture Registry (SNHFR).

METHODS

Retrospective study of a prospective database of hip fracture patients ≥ 75 years old between 2017 and 2019. Exclusion criterion was nonsurgical treatment. Association between TTS and 30-day mortality was assessed with a univariate analysis. Effect size was calculated using the probability of superiority. Regression analysis was performed to analyze the relationship between TTS and 30-day vital status. The ROC curve was used to evaluate the discrimination of mortality based on TTS.

RESULTS

A total of 29,695 patients met the inclusion criteria. The median TTS was 53.8 h. Surgery within 48 h was performed in 51.8 % of cases. Patients with delay of surgery more than 2 days rather than within 2 days were more likely to present an ASA score above 2 (58.9 % vs. 41.1 %, p < 0.001), less likely to achieve postoperative mobilization within 24 h (63 % vs. 67.4 %, p < 0.001), more likely to develop pressure ulcers (10.7 % vs. 6.9 %, p < 0.001), and had longer length of stay (10.7 days vs. 6.9 days, p < 0.001). The overall 30-day mortality rate was 7.8 %. Median TTS was significantly higher in decedents (66 h) than in survivors (56.5 h). There were higher statistically significant differences in 30-day mortality between patients who underwent surgery after 2 days (7.5 %) and those who underwent surgery within 2 days (5.4 %). The 30-day mortality was 5.2 % in patients operated within 24 h and 9.2 % in patients operated more than 120 h. Probability of superiority value was 0.44. Area under the curve reached a value of 0.55.

CONCLUSIONS

The associations between TTS and 30-day mortality were weak. Hip fracture surgery performed within 2 days was significantly associated with remobilization on the day after the hip fracture, with fewer postoperative pressure ulcers and shorter hospital stays. Despite the weakness of the TTS and 30-day mortality association, there are benefits to consider if surgery is performed within 2 days. Our results suggest that patients should be fit for surgery as soon as possible.

LEVEL OF EVIDENCE: IV.