Carbon Dioxide Angiography during Peripheral Vascular Interventions is associated with decreased Cardiac and Renal Complications in Patients with Chronic Kidney Disease.

OBJECTIVES: Patients with chronic kidney disease (CKD) who undergo peripheral vascular interventions (PVI) with iodinated contrast are at higher risk of post-contrast acute kidney injury (PC-AKI). CO2 angiography can reduce iodinated contrast volume usage in this patient population, but its impact on PC-AKI has not been studied. We hypothesize that CO2 angiography is associated with a decrease in PC-AKI in patients with advanced CKD.

METHODS: The Vascular Quality Initiative (VQI) Peripheral Vascular Interventions (PVI) dataset from 2010-2021 was reviewed. Only patients with advanced CKD (eGFR<45ml/min/1.73m2 ) treated for peripheral arterial disease (PAD) were included. Propensity matching and multivariate logistic regression based on demographics, comorbidities, CKD stage, and indications were used to compare the outcomes of patients treated with and without CO2 .

RESULTS: There were 20,706 PVIs performed in patients with advanced CKD and only 22% utilized CO2 angiography. Compared to patients treated without CO2 , patients who underwent CO2 angiography were younger and less likely to be women or white, and more likely to have poor renal function, diabetes, cardiac comorbidities, and present with tissue loss. Propensity matching yielded well-matched groups with 4,472 patients in each group. The procedural details after matching demonstrated 50% reduction in the volume of contrast used (32±33 ml vs 65±48 ml, p<0.01). PVI with CO2 angiography was associated with lower rates of PC-AKI (3.9% vs 4.8%, p=0.03) and cardiac complications (2.1% vs 2.9%, p=0.03) without a significant difference in technical failure or major/minor amputations. Low contrast volumes (≤50ml for CKD3, ≤20ml for CKD4, and ≤9ml for CKD5) are associated with reduced risk of PC-AKI (HR 0.59, p<0.01).

CONCLUSIONS: CO2 angiography reduces iodinated contrast volume usage during PVI and is associated with decreased cardiac complications and PC-AKI. CO2 angiography is underutilized and should be considered for patients with advanced CKD who require endovascular therapy.