Enhanced Recovery Protocols Reduce Length of Stay in Frail Bypass Patients

Optimizing Surgical Recovery in the Frail Vascular Population

Frailty is a primary determinant of surgical outcomes in peripheral arterial disease, with a pooled prevalence of 49% (95% CI 37-61%) among this patient population [1]. In the context of chronic limb-threatening ischemia (the advanced stage of peripheral arterial disease characterized by ischemic rest pain, ulceration, or gangrene), frailty is associated with a significant increase in mortality, carrying an odds ratio of 2.25 [2, 3]. Beyond survival, these vulnerable patients face a high risk of functional decline, including a loss of independent mobility and a greater likelihood of discharge to skilled nursing facilities or other higher levels of care [4]. While addressing modifiable risk factors is necessary to improve amputation-free survival (a composite clinical endpoint measuring the time a patient lives without requiring a major limb amputation), the efficacy of standardized perioperative recovery protocols in this specific cohort requires further investigation [5]. To address this gap, researchers recently evaluated whether structured enhanced recovery protocols can be effectively implemented in highly frail patients to reduce adverse outcomes following lower extremity bypass surgery.

Quantifying Frailty and Protocol Adherence

The researchers conducted a retrospective single-institution study of 257 patients who underwent infra-inguinal arterial bypass between 2021 and 2024 to evaluate how frailty affects adherence to an enhanced recovery protocol (ERP) and subsequent postoperative outcomes. To quantify patient vulnerability, the study utilized the National Surgical Quality Improvement Program (NSQIP) 5-item frailty index, a validated clinical tool that categorizes surgical risk based on functional status, diabetes, chronic obstructive pulmonary disease, congestive heart failure, and hypertension. Patients were stratified into three distinct cohorts based on their index scores: the F1 group (less frail) included those with zero to one risk factor, the F2 group included those with two risk factors, and the F3 group (highly frail) comprised patients with three to five risk factors. The study population was distributed relatively evenly across the frailty tiers, with 32.7% in the F1 group, 36.6% in the F2 group, and 30.7% in the F3 group. Significant demographic and clinical differences were noted at baseline between these cohorts. Patients in the F1 group were significantly younger, with a mean age of 65.0 years, compared to a mean age of 71.6 years for both the F2 and F3 groups (p < 0.001). Furthermore, the prevalence of tissue loss (a marker of advanced peripheral artery disease that often dictates the urgency of intervention) increased significantly with frailty severity, affecting 31.0% of F1 patients, 47.9% of F2 patients, and 62.0% of F3 patients (p < 0.001). These data underscore that the highly frail cohort presented not only with more comorbidities but also with more advanced surgical pathology. Despite the increased clinical complexity of the more vulnerable patients, the study found that high frailty was not a barrier to the implementation of enhanced recovery protocols. Compliance rates with the ERP were statistically similar across all groups, with adherence measured at 57.1% for F1, 54.8% for F2, and 61.5% for F3 patients (p = 0.739). This finding is clinically significant for vascular surgeons and referring physicians, as it demonstrates that the standardized components of an ERP, such as early mobilization and optimized fluid management, can be successfully applied to the most complex patients without a loss in protocol fidelity. The lack of association between frailty status and compliance suggests that even patients with multiple systemic comorbidities can be managed within a structured perioperative framework.

Clinical Impact on Length of Stay and Reintervention

The implementation of standardized perioperative pathways yielded substantial improvements in hospital throughput for the entire study population. Overall, patients managed within the enhanced recovery protocol experienced a significantly shorter median postoperative length of stay of 4.8 days, compared to 7.0 days for those in the non-ERP group (p < 0.001). This reduction in hospital days suggests that a structured approach to postoperative care facilitates faster stabilization and discharge across the spectrum of surgical risk. To further evaluate the durability of these outcomes in the elective intervention cohort, the researchers utilized Kaplan-Meier survival analysis (a statistical method used to estimate the probability of an event occurring over a specific period of time). This time-to-event analysis, with follow-up truncated at 30 days, showed no differences in 30-day freedom from reintervention, readmission, or mortality for elective procedures. However, the clinical benefits of protocol adherence were particularly pronounced within the F3 cohort, which represented the most highly frail patients. For these high-risk individuals, ERP compliance was associated with a lower reintervention rate of 15.0%, compared to 33.3% for those not following the protocol (p = 0.050). Furthermore, the highly frail patients in the ERP group saw a significant decrease in their median postoperative length of stay, which dropped to 7.9 days from the 9.8 days required by their non-ERP counterparts (p = 0.016). While the study was not powered to show a statistically significant difference in survival, there was a notable trend toward improved safety; within the F3 cohort, ERP compliance was associated with a reduction in 30-day mortality to 2.5%, down from 7.7% in the non-ERP group (p = 0.298). These findings indicate that enhanced recovery protocols are associated with improved postoperative outcomes in highly frail patients, challenging the assumption that extreme physiological vulnerability precludes the benefits of standardized care. Because high frailty was not a barrier to the implementation of these protocols, the data support the routine application of ERPs even in the most complex vascular cases. For practicing clinicians, this means that referring frail patients for necessary bypass surgery may carry less perioperative risk when the receiving institution utilizes strict enhanced recovery pathways, ultimately reducing both the duration of the initial hospital stay and the necessity for subsequent surgical interventions.

References

1. Wang Y, Wu X, Hu X, Yang Y. Prevalence of frailty in patients with lower extremity peripheral arterial disease: A systematic review and meta-analysis.. Ageing research reviews. 2022. doi:10.1016/j.arr.2022.101748

2. Alamarie B, Paracha AW, Zil-E-Ali A, Krause K, Aziz F. Association of Preoperative Frailty with Inferior Outcomes for Patients Undergoing Lower Extremity Bypass for Chronic Limb Threatening Ischemia: A Systematic Review.. Annals of vascular surgery. 2023. doi:10.1016/j.avsg.2023.05.044

3. Leatherby RJ, Hicks O, Guéroult A, Azhar B, Holt P, Roy I. Systematic Review, Meta-analysis, and Time to Event Analysis of Contemporary Mortality after Major Lower Limb Amputation for Peripheral Arterial Disease or Diabetes Mellitus.. European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery. 2025. doi:10.1016/j.ejvs.2025.11.057

4. Aalst FMV, Verwijmeren L, Dongen EPAV, Vries JPMD, Groot ED, Noordzij PG. Frailty and functional outcomes after open and endovascular procedures for patients with peripheral arterial disease: A systematic review.. Journal of vascular surgery. 2020. doi:10.1016/j.jvs.2018.12.060

5. Kim C, Yang YS, Ryu GW, Choi M. Risk factors associated with amputation-free survival for patients with peripheral arterial disease: a systematic review.. European journal of cardiovascular nursing. 2021. doi:10.1093/eurjcn/zvaa022