Appropriate Use of Intravascular Ultrasound During Arterial and Venous Lower Extremity Interventions

Intravascular Ultrasound Predictors of 12-Month Patency Loss Following Drug-Coated Balloon Angioplasty for the Femoropopliteal Artery

Intravascular ultrasound (IVUS) has been shown to improve outcomes of drug-coated balloon (DCB) angioplasty for treatment of femoropopliteal artery (FPA) disease. However, the optimal IVUS criteria for achieving improved outcomes of DCB angioplasty for FPA disease remain uncertain. The study aimed to identify IVUS predictors for loss of patency at 12 months after DCB angioplasty for FPA disease. After excluding one patient due to insufficient IVUS imaging data, 98 patients in the IVUS-guidance group of the IVUS-DCB trial were included in the analysis. IVUS parameters predicting loss of patency at 12 months and their optimal cut-off values were investigated. Among the 98 patients who underwent IVUS-guided FPA intervention, 16 patients (16.3%) lost primary patency within 12 months. End-stage renal disease on hemodialysis and, bailout stenting, postprocedural dissection length >50% were independent procedural predictors for 12-month patency loss. Receiver operating characteristic (ROC) curve demonstrated that postprocedural minimal lumen area (MLA) ≥ 11.6 mm2 (area under the ROC curve: 0.685, 95% CI: 0.513 to 0.857) as the optimal cut-off value for sustained primary patency. In survival analysis, patients with MLA ≥ 11.6 mm2 had a hazard ratio of 0.27 (95% CI: 0.09 to 0.80, p-value = 0.019, risk difference: 19.8) for lower risk of patency loss. A postprocedural MLA ≥11.6 mm2 was an independent IVUS predictor for sustained primary patency after DCB angioplasty in patients with FPA disease. Our findings suggest that lesion optimization and achieving sufficient lumen area under IVUS guidance during DCB angioplasty are crucial for maintaining target vessel patency.

Intravascular Imaging in Peripheral Endovascular Intervention: A Contemporary Review

Peripheral arterial disease affects more than 10 million individuals in the United States and over 200 million people worldwide. In the past, the majority of patients were treated with open bypass surgery, but an increasing number are now treated with minimally invasive peripheral endovascular intervention (PVI). To be successful, operators are reliant on the quality of the imaging data obtained during the case. This article reviews the data supporting the use of intravascular imaging in PVI, focusing specifically on lower extremity arterial interventions.

Femoropopliteal Interventions for Peripheral Artery Disease: A Review of Current Evidence and Future Directions

The femoropopliteal segment is a common anatomic location for peripheral artery disease. The clinical presentation of occlusive disease of the femoropopliteal segment can range from symptomatic or severe claudication if in isolation, or acute or chornic limb threatening ischemia often in the setting of multilevel disease. Patients can be treated with various therapies to improve symptoms and restore perfusion, including medical, exercise, endovascular, and open surgical therapies. The current literature is rapidly evolving on the best management algorithms and strategies based on patient presentation, severity of occlusive disease, and desired therapy goals. This paper summarizes current literature on available medical, endovascular, and surgical therapies for treating peripheral artery occlusive disease of the femoropopliteal segment.

Global Algorithm for the Endovascular Treatment of Chronic Femoropopliteal Lesions: An Interdisciplinary Expert Opinion Statement

A global treatment algorithm was developed for the endovascular revascularization of femoropopliteal lesions and chronic total occlusions, aiming toward a more standardized approach to endovascular treatment in patients with peripheral artery disease. The following steps are proposed. 1) Evaluation of lesion morphology based on preprocedural imaging by Duplex sonography and intravenous ultrasound for selection of lesion preparation tools. Lesion characteristics are mainly defined by calcification, lesion length, and the presence of total occlusion and in-stent restenosis. 2) Selection of vessel preparation strategies, which encompass plain old balloon angioplasty, atherectomy, thrombectomy, intravascular lithotripsy and specialty balloons, or a combination of the preceding, based on lesion and patient-specific characteristics. In addition, a Delphi consensus was applied for the appropriateness of lesion preparation strategies, depending on lesion anatomy, length, plaque morphology, and subintimal versus intraluminal guidewire crossing. 3) Definitive lesion treatment strategies using drug-coated balloons, bare-metal stents, drug-eluting stents, and/or covered stents or a combination. By establishing this treatment algorithm in routine practice, improvements in vessel- and patient-specific outcomes are anticipated, which will be further enhanced by continuous collaboration among experts from different countries and disciplines and by randomized controlled trials.

The Impact of Intravascular Ultrasound Use on 1-Year Outcomes After Infrapopliteal Endovascular Intervention

Background

Data supporting the use of intravascular ultrasound (IVUS) in aortoiliac and femoropopliteal endovascular intervention are becoming increasingly robust, but data in the infrapopliteal circulation remain limited. The aim of this study was to evaluate the association between IVUS use and 1-year outcomes after infrapopliteal intervention.

Methods

All infrapopliteal endovascular interventions that occurred between 2018-2021 at a single academic medical center were retrospectively reviewed. Cases were separated into 2 cohorts based on the use of IVUS. Clinical characteristics, procedural data, and imaging were collected up to 1-year postintervention. The primary outcome of interest was 1-year binary restenosis. Secondary outcomes included rates of 1-year target lesion revascularization, amputation, major adverse limb events, and all-cause mortality.

Results

One hundred patients with 142 lesions were included. IVUS was used in 23% of cases. Baseline characteristics, lesion characteristics, and treatment modalities did not differ significantly between cohorts. At 1 year, cases with IVUS utilization had significantly lower rates of binary restenosis (22% vs 57%; P = .004) and substantially lower rates of target lesion revascularization (13% vs 33%; P = .06). Rates of amputation, major adverse limb events, and mortality did not differ significantly. In multivariate analysis, lesions treated with IVUS were significantly less likely to have binary restenosis at 1 year when compared with angiography alone (odds ratio, 0.18; 95% CI, 0.05-0.62; P = .007).

Conclusions

Intravascular ultrasound use was associated with lower rates of 1-year restenosis when compared to angiography alone, even after correcting for differences in clinical and procedural characteristics. These findings support the need for a prospective randomized trial evaluating the impact of IVUS use on outcomes after infrapopliteal endovascular intervention.

Adjunctive Utilization of Intravascular Ultrasound in Peripheral Arterial Disease Treatment

BACKGROUND

The utility and benefit of intravascular ultrasound (IVUS) has been well established in coronary interventions, however widespread adoption for peripheral interventions has lagged. The objectives of this review article were to discuss the technical components of IVUS, describe key learning pearls for IVUS utilization, and review the literature describing the clinical outcomes of endovascular peripheral arterial interventions using IVUS.

METHODS

A scoping review of the current literature utilizing Pubmed. Terms used to search the literature included "intravascular ultrasound (IVUS)" in conjunction with "peripheral arterial disease (PAD)," "endovascular interventions," "chronic limb threatening ischemia," "balloon angioplasty" "stenting," "percutaneous coronary intervention," and "outcomes." All types of articles were reviewed including review articles, retrospective reviews, meta-analyses, and prospective observational and randomized studies.

RESULTS

Published literature regarding IVUS use in peripheral arterial interventions is heterogeneous and limited to mainly retrospective studies, registry analyses and metanalyses. Outcomes are generally favorable with the adjunct of IVUS compared to traditional angiography-driven peripheral interventions. The addition of IVUS improves stent expansion, stent patency, and reduces reintervention rates, particularly in infrainguinal arterial lesions. Long-term costs may also be lower with IVUS-guided procedures.

CONCLUSIONS

Expert consensus largely supports the implementation of IVUS in endovascular interventions for peripheral arterial disease. However, more robust high-quality data evaluating the efficacy, durability, and cost of IVUS in peripheral arterial disease are still needed.

Intravascular Ultrasound Use is Associated with Improved Patency in Lower Extremity Peripheral Arterial Interventions

BACKGROUND

Intravascular ultrasound (IVUS) facilitates detailed visualization of endoluminal anatomy not adequately appreciated on conventional angiography. However, it is unclear if IVUS use improves clinical outcomes of peripheral vascular interventions (PVIs) for peripheral arterial disease. This study aimed to evaluate the impact of IVUS on 1-year outcomes of PVI in the vascular quality initiative (VQI).

METHODS

The VQI-PVI modules were reviewed (2016-2020). All patients with available 1-year follow-up after lower extremity PVI were included and grouped as IVUS-PVI or non-IVUS PVI based on use of IVUS. Propensity matching (1:1) was performed using demographics and comorbidities. One-year major amputation and patency rates were compared. A generalized estimating equation model was used to identify predictors of 1-year outcomes. Subgroup analysis based on Trans-Atlantic Intersociety Consensus (TASC) classification, treatment length and treatment modalities were performed using same modeling approaches.

RESULTS

There were 56,633 procedures (non-IVUS PVI = 55,302 vs. IVUS-PVI = 1,331) in 44,042 patients. Propensity matching yielded a total cohort of 1,854 patients matched (1:1), with no baseline differences. Lower extremity revascularization for claudication was performed in 60.4%, while one-third (33.9%) had chronic limb threatening ischemia (CLTI). IVUS was more commonly used for lesions >15 cm in length (46.6% vs. 43.3%) and for aortoiliac disease (31.8% vs. 27.2%). Rates of atherectomy and stenting were significantly higher with IVUS-PVI (21.1% vs. 16.8%), while balloon angioplasty was less common (13.5% vs. 24.4%). One-year patency was better with IVUS-PVI (97.7% vs. 95.2%, P = 0.004). On subgroup analysis, IVUS (odds ratio [OR] 2.20, 95% confidence interval [CI] 1.29-3.75) was associated with improved patency in CLTI patients, TASC C or D lesions, and treatment length >15 cm. Adjunctive IVUS use during PVI did not significantly impact 1-year amputation (OR 1.7, 95% CI 0.78-3.91). On multivariable regression, adjunctive use of IVUS (OR 2.46 95% CI 1.43-4.25) and aortoiliac interventions (OR 2.91, 95% CI 1.09-7.75) were independent predictors of patency. Treatment modalities such as atherectomy, stenting or balloon angioplasty did not significantly impact patency at 1-year.

CONCLUSIONS

IVUS during lower extremity PVI is associated with improved 1-year patency, when compared to angiography alone. Certain subgroups, such as CLTI patients, lesions>15 cm, and TASC C or D lesions might benefit from adjunctive use of IVUS.

Intravascular Ultrasound during Endovascular Intervention for Peripheral Artery Disease, by Severity, Location, Device, and Procedure

There is limited evidence for the role of intravascular ultrasound (IVUS) in patients who underwent peripheral vascular intervention (PVI). We conducted retrospective cohort study utilizing the Healthcare Cost and Utilization Project-Agency for Healthcare Research and Quality National Readmission database to delineate outcomes in IVUS-guided PVI versus non-IVUS-guided PVI. The present study utilized National Readmission database between January 1, 2016, and December 31, 2019. We identified patients who underwent endovascular intervention for peripheral artery disease using relevant International Classification of Diseases, Tenth Revision, Procedural Coding System. The cohort was divided based on the use of IVUS during the procedure. The primary outcome was major amputation at 6 months after index hospitalization. Measured confounders were matched using propensity score inverse probability of treatment weighing method. We further performed a subgroup analysis based on disease severity, location of intervention, device, and procedure. A total of 434,901 hospitalizations were included in the present analysis. PVI with IVUS compared with no IVUS had similar risk of amputation at 6 months (195 of 8,939 [2.17%] vs 10,404 of 384,003 [2.71%]), hazard ratio 0.98, CI 0.77 to 1.25. Further, there was no difference in the rates of secondary outcomes. On subgroup analysis, amputation rates were significantly lower in patients with rest pain, in iliac intervention, or patients who underwent drug-eluting stent implantation with the use of IVUS compared with no IVUS. This nationwide observational study showed that there was no difference in major amputation rates with the use of IVUS in patients who underwent PVI. However, in subgroup of patients with rest pain, iliac intervention or drug-eluting stent implantation IVUS use was associated with significantly lower major amputation rates.

Retrospective Case Control Matched Comparison of the Antegrade Versus Retrograde Strategy After Antegrade Recanalisation Failure in Complex de novo Femoropopliteal Occlusive Lesions

OBJECTIVE

To investigate dissection severity, need for bailout stenting and limb outcomes in patients undergoing antegrade vs. retrograde revascularisation.

METHODS

Consecutive patients who underwent either antegrade or retrograde revascularisation after failed antegrade recanalisation of long femoropopliteal chronic total occlusion (CTO) due to symptomatic peripheral artery disease between January 2017 and June 2022 were studied. Retrospective case control matching was used to adjust for lesion length and calcification using the peripheral artery calcification scoring system (PACSS). Procedural outcomes included severity of dissection (Type A to F dissections, numerically graded on a scale from 0 - 6 with increasing severity) after angioplasty and number and location of stents needed to be implanted during the index procedure. Additionally, clinically driven target lesion revascularisation (CD-TLR) and major (above ankle) amputation rates were assessed during follow up.

RESULTS

A total of 180 patients were analysed who underwent antegrade (n = 90) or retrograde after failed antegrade (n = 90) recanalisation. The median patient age was 76.0 (interquartile range [IQR] 67.0, 82.0) years and 76 (42.2%) were female. Moreover, 78 patients (43.3%) had intermittent claudication, whereas 102 (56.7%) had chronic limb threatening ischaemia (CLTI). The mean lesion length was 30.0 (IQR 24.0, 36.0) cm with moderate to severe (3.0 [IQR 2.0, 4.0]) lesion calcification. Dissection severity after angioplasty was higher in the antegrade than retrograde after failed antegrade recanalisation group (4.0 [IQR 3.0, 4.0] vs. 3.0 [IQR 2.0, 4.0]; p < .001). Additionally, the number of stents in all segments and the rate of bailout stenting in popliteal segments was significantly higher with the antegrade strategy (2.0 [IQR 1.0, 3.0] vs. 1.0 [IQR 0, 2.0], p < .010; and 37% vs. 14%, p < .001). During a median follow up of 1.48 (IQR 0.63, 3.09) years, CD-TLR rates (p = .90) and amputation rates in patients with CLTI (p = .15) were not statistically significant.

CONCLUSION

In complex femoropopliteal CTOs, retrograde after failed antegrade recanalisation, is safe for endovascular revascularisation, which in experienced hands may result in less severe dissections and lower rates of stent placement. However, considering the relatively short follow up, CD-TLR and amputation rates were not statistically different between the two approaches. [German Clinical Trials Register: DRKS00015277.].

Cost-effectiveness analysis of intravascular ultrasound-guided peripheral vascular interventions in patients with femoropopliteal peripheral artery disease

Background: Intravascular ultrasound (IVUS)-guided percutaneous transluminal angioplasty (PTA) might offer clinical benefits compared to angiography-guided PTA in patients with peripheral artery disease (PAD). A cost-effectiveness model was developed to examine the benefits and costs of IVUS-guided PTA versus angiography-guided PTA in PAD patients with femoropopliteal (FP) occlusive disease. Methods: A two-step model (a one-year decision tree followed by a lifetime semi-Markov model) was developed from a German healthcare payer perspective to estimate the costs and outcomes over a one-year and lifetime horizon. Clinical events included target lesion revascularization (TLR), amputation, and death. Transition probabilities and utility values were derived from published literature. Healthcare costs were based on German Diagnosis Related Groups (DRG) codes. Costs and outcomes were discounted at a rate of 3% per year. The incremental cost-effectiveness ratio (ICER) was calculated, and sensitivity analyses were performed to assess the robustness of the results. Results: In the one-year horizon, IVUS-guided PTA resulted in incremental quality-adjusted life-years (QALY) and costs of 0.02 and €919 per patient respectively, with a corresponding ICER of €45,195/QALY gained versus angiography-guided PTA. In the lifetime horizon, IVUS-guided PTA outperforms angiography-guided PTA; it was associated with a cost saving of €46 per patient and incremental QALY of 0.22. Utility value for post-TLR, as well as probabilities of death and TLR had the greatest impact on the one-year ICER, while cost of TLR and probabilities of TLR and amputation influenced the lifetime ICER most. The probability of IVUS-guided PTA being cost-effective at a willingness-to-pay (WTP) threshold of €50,000/QALY was 50.4% in the one-year horizon and increased to 85.9% in the lifetime horizon. Conclusions: In this analysis IVUS-guided PTA among patients with symptomatic FP atherosclerosis was cost-saving in a lifetime horizon from the German healthcare payer perspective.

The mid-term effect of intravascular ultrasound on endovascular interventions for lower extremity peripheral arterial disease: A systematic review and meta-analysis

OBJECTIVE

Intravascular ultrasound (IVUS) is an important adjunctive tool for patients with lower extremity peripheral arterial disease (PAD) undergoing endovascular therapy (EVT). The evidence regarding the advantages of IVUS use is evolving, and recent studies have reported conflicting results. We aimed to perform a meta-analysis to evaluate the efficacy of IVUS during angiography-guided EVT for patients with PAD.

METHODS

MEDLINE and EMBASE were searched through April 2023 to identify studies that investigated the outcomes of IVUS with angiography-guided EVT vs angiography-alone-guided EVT. The primary outcome was restenosis/occlusion rate; secondary outcomes were target lesion revascularization, major amputation, and mortality.

RESULTS

One randomized controlled trial and 14 observational studies, largely of moderate quality, were included, yielding a total of 708,808 patients with 709,189 lesions that were treated with IVUS-guided EVT (n = 101,405) vs angiography-alone (n = 607,784). Compared with angiography alone, IVUS-guided EVT was associated with a non-significant trend towards decreased restenosis/occlusion (relative risk [RR], 0.74; 95% confidence interval [CI], 0.54-1.00; I2 = 60%). Although the risk of target lesion revascularization and mortality were comparable (RR, 0.85; 95% CI, 0.65-1.10; I2 = 70%; RR, 1.01; 95% CI, 0.79-1.28; I2 = 43%, respectively), the use of IVUS was also associated with significantly lower risk of major amputation (RR, 0.74; 95% CI, 0.67-0.82; I2 = 47%). Subgroup analysis focusing on femoropopliteal disease demonstrated significantly higher patency (RR, 0.72; 95% CI, 0.52-0.98; I2 = 73%). However, superiority with major amputation was not observed.

CONCLUSIONS

IVUS-guided EVT for PAD may possibly be associated with a lower major amputation rate compared with angiography alone-guided EVT, although the difference in patency remained an insignificant trend in favor of IVUS-guided EVT. Adjunctive use of IVUS during EVT may be beneficial, and further prospective studies are warranted to delineate this relationship and the applicability of this technology in routine practice.

Intravascular Ultrasound Use in Peripheral Arterial and Deep Venous Interventions: Multidisciplinary Expert Opinion From SCAI/AVF/AVLS/SIR/SVM/SVS

Percutaneous revascularization is the primary strategy for treating lower extremity venous and arterial disease. Angiography is limited by its ability to accurately size vessels, precisely determine the degree of stenosis and length of lesions, characterize lesion morphology, or correctly diagnose postintervention complications. These limitations are overcome with use of intravascular ultrasound (IVUS). IVUS has demonstrated the ability to improve outcomes following percutaneous coronary intervention, and there is increasing evidence to support its benefits in the setting of peripheral vascular intervention. At this stage in its evolution, there remains a need to standardize the use and approach to peripheral vascular IVUS imaging. This manuscript represents considerations and consensus perspectives that emerged from a roundtable discussion including 15 physicians with expertise in interventional cardiology, interventional radiology, and vascular surgery, representing 6 cardiovascular specialty societies, held on February 3, 2023. The roundtable's aims were to assess the current state of lower extremity revascularization, identify knowledge gaps and need for evidence, and determine how IVUS can improve care and outcomes for patients with peripheral arterial and deep venous pathology.

Sensorized Endovascular Technologies: Additional Data to Enhance Decision-Making

BACKGROUND

Current endovascular procedures rely mostly on anatomic information, guided by fluoroscopy, to perform interventions (i.e. angioplasty, stent placement, coils). However, the structural parameters provided by these imaging technologies do not provide any physiological data on either the disease state or efficacy of intervention. Additional endovascular tools are needed to collect physiologic and other both anatomic and nonanatomic data to further individualize endovascular interventions with the ultimate goal of improving patient outcomes. This review details the current state of the art for these sensorized endovascular technologies and details systems under development with the aim of identifying gaps and new directions. The objective of this review was to survey the Vascular Surgery literature, engineering literature, and commercially available products to determine what exists in terms of sensor-enabled endovascular devices and where gaps and opportunities exist for further sensor integration.

METHODS

Search terms were entered into search engines such as Google and Google Scholar to identify endovascular devices containing sensors. A variety of terms were used including directly search for items such as "sensor-enabled endovascular devices" and then also completing more refined searches bases on areas of interest (i.e. fractional flow reserve, navigation, retrograde endovascular balloon occlusion of the aorta, etc.). For the most part, systems were included where the sensor was mounted directly onto the catheter and implantable sensors such as those that have been investigated for use with stents have been excluded.

RESULTS

The authors were able to identify a body of literature in the area of endovascular devices that contain sensors to measure physiologic information. However, areas where additional sensing capabilities may be useful were identified.

CONCLUSIONS

Several different types of sensors and sensing systems were identified that have been integrated with endovascular catheters. Although a great deal of work has been done in this field, there are additional useful data that could be obtained from additional novel sensing technologies. Furthermore, significant effort needs to be allocated to carefully studying how these new technologies can be employed to actually improve patient outcomes.

Intravascular Ultrasound Use in Peripheral Arterial and Deep Venous Interventions: Multidisciplinary Expert Opinion From SCAI/AVF/AVLS/SIR/SVM/SVS

Percutaneous revascularization is the primary strategy for treating lower extremity venous and arterial disease. Angiography is limited by its ability to accurately size vessels, precisely determine the degree of stenosis and length of lesions, characterize lesion morphology, or correctly diagnose postintervention complications. These limitations are overcome with use of intravascular ultrasound (IVUS). IVUS has demonstrated the ability to improve outcomes following percutaneous coronary intervention, and there is increasing evidence to support its benefits in the setting of peripheral vascular intervention. At this stage in its evolution, there remains a need to standardize the use and approach to peripheral vascular IVUS imaging. This manuscript represents considerations and consensus perspectives that emerged from a roundtable discussion including 15 physicians with expertise in interventional cardiology, interventional radiology, and vascular surgery, representing 6 cardiovascular specialty societies, held on February 3, 2023. The roundtable's aims were to assess the current state of lower extremity revascularization, identify knowledge gaps and need for evidence, and determine how IVUS can improve care and outcomes for patients with peripheral arterial and deep venous pathology.

Endovascular Interventions for Peripheral Artery Disease: A Contemporary Review

PURPOSE OF REVIEW

Peripheral artery disease (PAD) is an increasingly prevalent but frequently underdiagnosed condition that can be associated with high rates of morbidity and mortality. While an initial noninvasive approach is the cornerstone of management, revascularization is often pursued for patients with treatment-refractory claudication or chronic limb-threatening ischemia (CLTI). In this review, we discuss the current state of endovascular interventions for PAD and explore the many new emerging technologies.

RECENT FINDINGS

The last decade has resulted in numerous advances in PAD interventions including the ongoing evolution of drug-coated devices, novel approaches to complex lesions, and contemporary evidence from large clinical trials for CLTI. Advances in endovascular management have allowed for increasingly complex lesions to be tackled percutaneously. Future directions for the field include the continued evolution in device technology, continued development of state-of-the-art techniques to revascularization of complex lesions, and increased collaboration between a largely multidisciplinary field.

Best crossing of peripheral chronic total occlusions

Together with colleagues from different disciplines, including cardiologists, interventional radiologists and vascular surgeons, committee members of the of the German Society of Angiology (Deutsche Gesellschaft für Angiologie [DGA]), developed a novel algorithm for the endovascular treatment of peripheral chronic total occlusive lesions (CTOs). Our aim is to improve patient and limb related outcomes, by increasing the success rate of endovascular procedures. This can be achieved by adherence to the proposed crossing algorithm, aiding the standardization of endovascular procedures. The following steps are proposed: (i) APPLY Duplex sonography and if required 3D techniques such as computed tomography or magnetic resonance angiography. This will help you to select the optimal access site. (ii) EVALUATE the CTO cap morphology and distal vessel refilling sites during diagnostic angiography, which are potential targets for a retrograde access. (iii) START with antegrade wiring strategies including guidewire (GW) and support catheter technology. Use GW escalation strategies to penetrate the proximal cap of the CTO, which may usually be fibrotic and calcified. (iv) STOP the antegrade attempt depending on patient specific parameters and the presence of retrograde options, as evaluated by pre-procedural imaging and during angiography. (v) In case of FAILURE, consider advanced bidirectional techniques and reentry devices. (vi) In case of SUCCESS, externalize the GW and treat the CTO. Manage the retrograde access at the end of the endovascular procedure. (vii) STOP the procedure if no progress can be obtained within 3 hours, in case of specific complications or when reaching maximum contrast administration based on individual patient's renal function. Consider radiation exposure both for patients and operators. In this manuscript we systematically follow and explain each of the steps (i)-(vi) based on practical examples from our daily routine. We strongly believe that the integration of this algorithm in the daily practice of endovascular specialists, can improve vessel and patient specific outcomes.

Crossing Algorithm for Infrainguinal Chronic Total Occlusions: An Interdisciplinary Expert Opinion Statement

A crossing algorithm was developed for the endovascular treatment of peripheral chronic total occlusive lesions (CTOs) to educate, guide, and appropriately influence clinical practice aiming at harmonization and standardization of endovascular procedures. The following steps are proposed: One, duplex sonography and if required computed tomography or magnetic resonance angiography for the selection of the optimal access site. Two, angiographic evaluation of the proximal/distal cap morphology, presence of collaterals at the origin of the proximal cap and at the distal vessel refilling site. In addition, evaluation of distal vessels, including their diameters and quality, and the presence of calcification or stents within the occlusion zone. Three, antegrade wiring strategies, guidewire (GW) and support catheter technology, as well as GW escalation strategies. Stop the antegrade attempt depending on clinical indication for peripheral artery disease treatment and the presence of retrograde options. Four, retrograde access site, support catheter, or sheath insertion and wiring technology from distally. Five, considering strategy change when progress cannot by achieved, using advanced bidirectional techniques and re-entry devices. Six, in case of successful GW passage from retrograde, GW externalization and treatment from antegrade. Management of the retrograde access by internal or external hemostasis at the end of the procedure. Alternatively, stop the procedure if no progress can be obtained within 3 hours or in case of specific complications. By establishing the algorithm in the daily routine of endovascular specialists, improvements in vessel- and patient-specific outcomes are anticipated. In addition, future research, and continuous collaboration between experts is warranted.

Evaluation of 3-dimensional rotational venography for the diagnosis of non-thrombotic iliac venous lesion

Background

The purpose of this study was to determine the technical feasibility and safety of 3D rotational venography (3D-RV) in the diagnosis of non-thrombotic iliac vein lesions compared with traditional 2D-digital subtraction angiography (2-DSA).

Methods

The general epidemiological data (including age, gender), clinical manifestations (including major symptom, affected extremity, CEAP classification, comorbidity, stenosis rate), and intra-operative findings (iliac vein indentation position, collateral circulation, procedure time, X-rays dose, contrast agent dosage) of 61 NIVL patients who were assessed by 3D-RV and traditional 2-DSA between October 2018 to October 2022 were obtained and analyzed.

Results

A total of 61 consecutive patients with symptomatic NIVL from our institution were enrolled in this study. With the aggravation of iliac vein stenosis, the proportion of indicators such as contralateral formation and iliac vein compression indentation reflecting the severity of compression under 3D-RV reconstruction increased significantly. Also, significant differences were observed between the 3D-RV and 2-DSA groups concerning procedure time (10.56 ± 0.09 s vs. 12.59 ± 0.37 s; p < 0.01), X-ray dose (41.25 ± 0.21 mGy vs. 81.59 ± 1.69 mGy; p < 0.01) and contrast agent dosage (21.48 ± 0.24 mL vs. 33.69 ± 0.72 mL; p < 0.01). Contralateral iliac vein imaging (p = 0.002), pelvic collateral vein imaging (p = 0.03), and external iliac vein indentation (p = 0.001) were found to influence the severity of iliac vein compression.

Conclusion

3D-RV can display dynamic stereo image information of NIVL, augmenting the information obtained from traditional 2-DSA. Contralateral iliac vein imaging, pelvic collateral vein imaging, and external iliac vein indentation can be used to evaluate the severity of iliac vein compression to some extent.