Methods for Reducing Contrast Use and Avoiding Acute Kidney Injury During Endovascular Procedures

An Analysis of the Prevalence and Risk Factors of Contrast-Associated Acute Kidney Injury in Patients With Diabetic Foot Ulcer

The occurrence of contrast-associated acute kidney injury (CA-AKI) is influenced by both patient-related and contrast-related factors. More specifically, CA-AKI has been linked to renal dysfunction, diabetes mellitus (DM), and atherosclerotic cardiovascular diseases (ASCVD). We hypothesized that the prevalence of CA-AKI was high in patients with diabetic foot ulcers (DFU) because they frequently have several ASCVD risk factors and additional comorbid conditions (including ASCVD). We retrospectively examined the medical records of 208 type 2 diabetic patients who were hospitalized for DFU. These patients were divided into two groups: group 1 included 107 patients who underwent contrast-enhanced computed tomographic angiography (CTA); group 2 (control group) included 101 patients who did not receive contrast media. Following CTA, 13 (12.1%) patients developed CA-AKI in group 1, while 3 (3.0%) patients in group 2 had serum creatinine elevations consistent with AKI (P = 0.013). The following risk factors for CA-AKI were identified: longer history of DM, higher baseline serum creatinine, congestive heart failure, Wagner stage 4 and 5 DFUs, peripheral artery disease, older age, and lower hemoglobin values. CA-AKI is a common complication after CTA in patients with DFU. To reduce the risk of CA-AKI in these patients, associated risk factors and preventive measures should be considered.

CIRSE Standards of Practice on Below-the-Knee Revascularisation

The CIRSE Standards of Practice Committee established a writing group that was tasked with producing up-to-date recommendations for performing below-the-knee revascularisation, taking into account data on novel techniques, devices, and long-term outcomes that have emerged over the last decade. CIRSE Standards of Practice documents are not clinical practice guidelines or systematic reviews of the literature. This document is not intended to impose a standard of clinical patient care but recommends a reasonable approach to and best practices for performing below-the-knee revascularisation.

Long-Term Follow-Up of Contrast-Induced Acute Kidney Injury: A Study from a Developing Country

Introduction

Contrast-induced acute kidney injury (CI-AKI) is a worldwide known complication related to the use of contrast media with either imaging or angiography; it carries its own complications and effect on both morbidity and mortality; early identification of patients at risk and addressing modifiable risk factors may help reducing risk for this disease and its complications.

Methods

This was a prospective observational study, where all patients admitted for cardiac catheterization between June 2015 and January 2016 were evaluated for CI-AKI. There were two study groups: contrast-induced acute kidney injury (CI-AKI) group, and noncontrast-induced acute kidney injury (non-CI-AKI) group.

Results

Patients (n = 202) were included and followed up for 4 years. Death and development of chronic kidney disease (CKD) need for another revascularization were the end points. The incidence of CI-AKI was 14.8%.In univariate analysis, age (P = 0.016) and serum albumin at admission (P = 0.001) were statistically significant predictors of overall death. Age (P = 0.002), HTN (P = 0.002), DM (P = 0.02), and the use of diuretics (P = 0.001) had a statistically significant impact on eGFR. The rate of recatheterization was not statistically significant between the two groups (61 (35.5%) for the non-CI-AKI vs. 12 (40%) for the other group; P = 0.63). Some inflammatory markers (NGAL P = 0.06, IL-19 P = 0.08) and serum albumin at admission P = 0.07 had a trend toward a statistically significant impact on recatheterization. Death (P = 0.66) and need for recatheterization (P = 0.63) were not statistically different between the 2 groups, while the rate of eGFR decline in for the CI-AKI was significant (P = 0.004).

Conclusion

CI-AKI is a common complication post percutaneous catheterization (PCI), which may increase the risk for CKD, but not death or the need for recatheterization. Preventive measures must be taken early to decrease the morbidity.

Contrast-associated acute kidney injury: An update of risk factors, risk factor scores, and preventive measures

As lifespans lengthen, age-related diseases such as cardiovascular disease and diabetes are becoming more prevalent. Correspondingly, the use of contrast agents for medical imaging is also becoming more common, and there is increasing awareness of contrast-associated acute kidney injury (CA-AKI). There is no specific treatment for CA-AKI, and clinicians currently focus on prevention, interventions that alter its pathogenesis, and identification of risk factors. Although the incidence of CA-AKI is low in the general population, the risk of CA-AKI can reach 20% to 30% in patients with multiple risk factors. Many models have been applied in the clinic to assess the risk factors for CA-AKI, enable identification of high-risk groups, and improve clinical management. Hypotonic or isotonic contrast media are recommended to prevent CA-AKI in high-risk patients. Patients with risk factors should avoid using contrast media multiple times within a short period of time. All nephrotoxic drugs should be stopped at least 24 h before the administration of contrast media in high-risk populations, and adequate hydration is recommended for all patients. This review summarizes the pathophysiology of CA-AKI and the progress in diagnosis and differential diagnosis; updates the risk factors and risk factor scoring systems; reviews the latest advances related to prevention and treatment; discusses current problems in epidemiological studies; and highlights the importance of identifying high-risk subjects to control modifiable risk factors and use of a rating scale to estimate the risk and implement appropriate prevention strategies.