Objective
Although an increasing number of patients with peripheral arterial disease undergo multiple revascularization procedures, the effect of prior interventions on outcomes remains unclear. The purpose of this study was to evaluate perioperative outcomes of bypass surgery in patients with and those without prior ipsilateral treatment.
Methods
Patients undergoing non-emergent infrainguinal bypass between 2011 and 2014 were identified in the NSQIP-Targeted Vascular module. After stratification by symptom status (chronic limb-threatening ischemia [CLTI] and claudication), patients undergoing primary bypass were compared to those undergoing secondary bypass. Within the secondary bypass group, further analysis compared prior bypass to prior endovascular intervention. Multivariable logistic regression analysis was used to establish the independent association between prior ipsilateral procedure and perioperative outcomes.
Results
A total of 7302 patients were identified, of which 4540 (62%) underwent primary bypass (68% for CLTI), 1536 (21%) underwent secondary bypass after a previous bypass (75% for CLTI), and 1226 (17%) underwent secondary bypass after a previous endovascular intervention (72% for CLTI). Prior revascularization on the same ipsilateral arteries was associated with increased 30-day major adverse limb event in patients with CLTI (9.8% vs. 7.4%; OR: 1.4, 95% CI: 1.1–1.7) and claudication (5.2% vs. 2.5%; 2.1, 1.3–3.5). Similarly, secondary bypass was an independent risk factor for 30-day major reintervention (CLTI: 1.4, 1.1–1.8; claudication: 2.1, 1.3–3.5), bleeding (CLTI: 1.4, 1.2–1.6; claudication: 1.7, 1.3–2.4), and unplanned reoperation (CLTI: 1.2, 1.0–1.4; claudication: 1.6, 1.1–2.1), whereas major amputation was increased in CLTI patients only (1.3, 1.0–1.8). Perioperative mortality was not significantly different in patients undergoing secondary compared to primary bypass (CLTI: 1.7% vs. 2.2%, P = .22; claudication: 0.4% vs. 0.6%, P = .76). Among secondary bypass patients with CLTI, those with prior bypass had higher 30-day reintervention rates (7.8% vs. 4.9%; OR: 1.5, 95% CI: 1.0–2.2), but fewer wound infections (7.3% vs. 12%; 0.6, 0.4–0.8) compared to patients with prior endovascular intervention.
Conclusions
Prior revascularization, in both patients with CLTI and claudication, is associated with worse perioperative outcomes compared to primary bypass. Furthermore, prior endovascular intervention is associated with increased wound infections, whereas those with prior bypass had higher reintervention rates. The increasing prevalence of patients undergoing multiple interventions stresses the importance of patient selection for initial treatment and should be factored into subsequent revascularization options in an effort to decrease adverse events.