Use of the Endoleak-to-Aortic Density Ratio to Distinguish Direct Endoleaks from Indirect Endoleaks after Endovascular Aortic Aneurysm Repair.

PURPOSE: To define criteria to distinguish direct (type 1 or 3) from indirect endoleaks (type 2) in the arterial phase of contrast-enhanced computed tomography (CT) scans in patients with abdominal aortic aneurysms treated with endovascular aortic repair. MATERIALS AND METHODS: This retrospective study was conducted from January 2009 to October 2020 and included consecutive patients treated endovascularly for a direct endoleak or an indirect endoleak associated with an enlarging aneurysm. The following characteristics were evaluated using contrast-enhanced CT: location, size, contact with the endograft, density, morphologic criteria, collateral artery enhancement, and endoleak-to-aortic density ratio. Statistical analysis included the Mann-Whitney U test, Pearson χ2 test, Fisher exact test, receiver operating characteristic curve analysis, and multivariable logistic regression. RESULTS: Contrast-enhanced CT scans from 71 patients (87% men), who presented with 87 endoleaks (44 indirect and 43 direct endoleaks), treated by endovascular techniques were analyzed. Using visual criteria, 56% of the endoleaks were not characterizable as direct or indirect. An endoleak-to-aortic density ratio of >0.77 could properly distinguish direct from indirect endoleaks, with a theoretical accuracy of 98% (area under the receiver operating characteristic curve, 0.99), sensitivity of 95%, specificity of 100%, positive predictive value of 100%, and negative predictive value of 96%. CONCLUSION: An endoleak-to-aortic density ratio of >0.77 in the arterial phase of contrast-enhanced CT could be a strong discriminant of a direct-type endoleak.

Reporting Peripheral Artery Disease in Claudicants: Lessons Learned From the TASC-Ability Study.

BACKGROUND: The Trans-Atlantic Inter-Society Consensus Document (TASC II) aims to comprehensively describe the case scenarios of aortoiliac and femoropopliteal lesions to suggest an endovascular or a surgical approach. Over time, it has become a guide for describing the gravity of arterial lesions. PURPOSE: To assess the revised TASC II system for classifying arterial lesions in a large database of patients presenting with claudication. MATERIALS AND METHODS: This study was a retrospective review of the arteriograms of patients with intermittent claudication. Aortoiliac and femoropopliteal lesions were classified according to the TASC II. When no consensus was reached, the lesion was rated as unTASCable. RESULTS: In total, 1454 patients were included (male: 62.1%, 66.8±9.3 years). There were 39% aortoiliac lesions (n=960/2462) and 61% femoropopliteal lesions (n=1502/2462); 33.6% of the patients (n=489/1454) were associated with aortoiliac and femoropopliteal lesions. In addition, 20% of the lesions (n=493/2462) were unTASCable, and 26.7% of the patients (n=388/1454) had at least 1 unTASCable lesion. There were 4 categories of unTASCable lesions: (1) association with a common femoral artery lesion in 53.1% (n=262/493); (2) iliac artery lesions in 23.1% (n=114/493); (3) femoropopliteal lesions whose lengths did not fit into any category in 16.6% (n=82/493); and (4) association with an aortic lesion in 7.1% (n=35/493). The interobserver agreement was 0.97 for anatomically describing the infrarenal arterial tree and 0.85 for TASCing, with the lesions lowering to 0.69 for aortoiliac lesions. CONCLUSION: Using the revised TASC II case scenario, 26.7% of the patients had at least 1 unTASCable lesion. Reporting peripheral artery disease using a comprehensive anatomical description of the infrarenal arterial tree showed better interobserver reproducibility.

Canadian Association of Radiologists/Canadian Association for Interventional Radiology/Canadian Society of Thoracic Radiology Guidelines on Thoracic Interventions.

Thoracic interventions are frequently performed by radiologists, but guidelines on appropriateness criteria and technical considerations to ensure patient safety regarding such interventions is lacking. These guidelines, developed by the Canadian Association of Radiologists, Canadian Association for Interventional Radiology and Canadian Society of Thoracic Radiology focus on the interventions commonly performed by thoracic radiologists. They provide evidence-based recommendations and expert consensus informed best practices for patient preparation; biopsies of the lung, mediastinum, pleura and chest wall; thoracentesis; pre-operative lung nodule localization; and potential complications and their management.

Paclitaxel and mortality in patients with claudication and de novo femoropopliteal lesions: a historical cohort study.

OBJECTIVE: To compare the mortality rates of patients with claudication and de novo femoropopliteal lesions treated with and without paclitaxel coated devices (PCD). BACKGROUND: A recent meta-analysis, mostly including patients with claudication and de novo femoropopliteal lesions but also with recurrent stenoses and critical limb ischemia, has shown a significant excess mortality in patients treated with PCD. METHODS: Comparison of two historical cohorts of patients presenting with claudication and de novo femoropopliteal lesions treated with and without PCD between 2008 and 2018. RESULTS: After review of 5219 arteriograms in patients presenting with peripheral artery disease, 700 consecutive patients were included consisting in 72.6% of male (n = 508). Mean age was 68.1 ± 8.5 years. 45.7% of the patients (n = 320) had a treatment including a PCD. Mean femoropopliteal lesion length was 123 ± 91 mm including 44.6% of occlusions. Patients of the control group were censored at crossover to paclitaxel when applicable. Mortality rates at 1, 2 and 5 years were 4.6%, 7.5%, 19.4% and 1.6%, 6.2%, 16.6% in the non-PCD and PCD groups respectively. The relative risks of death when using PCD were 0.35 (p = 0.03), 0.83 (p = NS) and 0.86 (p = NS) at 1, 2 and 5 years respectively. CONCLUSION: There was no excess mortality in patients with claudication and de novo femoropopliteal lesions treated with paclitaxel coated devices at 1, 2 and 5 years of follow-up in this cohort. The current study suggests that additional prospective randomized studies properly powered to study mortality are necessary.

Novel Z Scores to Correct Biases Due to Ventricular Volume Indexing to Body Surface Area in Adolescents and Young Adults.

BACKGROUND: Reference values for cardiac magnetic resonance imaging (cMRI) in children and young adults are scarce. This leads to risk stratification of patients with congenital heart diseases being based on volumes indexed to body surface area (BSA). We aimed to produce cMRI Z score equations for ventricular volumes in children and young adults and to test whether indexing to BSA resulted in an incorrect assessment of ventricular dilation according to sex, body composition, and growth. METHODS: We retrospectively included 372 subjects aged < 26 years with either normal hearts or conditions with no impact on ventricular volumes (reference group), and 205 subjects with repaired tetralogy of Fallot (TOF) aged < 26 years. We generated Z score equations by means of multivariable regression modelling. Right ventricular dilation was assessed with the use of Z scores and compared with indexing to BSA in TOF subjects. RESULTS: Ventricular volume Z scores were independent from age, sex, and anthropometric measurements, although volumes indexed to BSA showed significant residual association with sex and body size. In TOF subjects, indexing overestimated dilation in growing children and underestimated dilation in female compared with male subjects, and in overweight compared with lean subjects. CONCLUSIONS: Indexed ventricular volumes measured with cMRI did not completely adjust for body size and resulted in a differential error in the assessment of ventricular dilation according to sex and body size. Our proposed Z score equations solved this problem. Future studies should evaluate if ventricular volumes expressed as Z scores have a better prognostic value than volumes indexed to BSA.

The Cupidon's Strike Technique: How to Never Miss a Rendezvous While Going on SAFARI.

One of the difficulties of the subintimal arterial flossing with antegrade-retrograde intervention technique (SAFARI) technique is to properly achieve a rendezvous between both antegrade and retrograde accesses. We propose a new technique to overcome this difficulty. It consists of directly percutaneously puncturing 2 loop snares, placed via each access, which are then both used to snare an externally introduced guidewire introduced through the needle. The snares are then moved en bloc, bringing both snares and the wire into the same channel.

COVID-19 patients presenting with afebrile acute abdominal pain.

IMPORTANCE: With the surge in COVID-19 cases worldwide, the medical community should be aware of atypical clinical presentations to help with correct diagnosis, to take the proper measures to place the patient in isolation and to avoid healthcare professionals being infected by coronavirus (SARS-CoV-2). OBJECTIVE: To report that patients who subsequently test positive for COVID-19 may present with acute abdominal pain and no pulmonary symptoms, although they already have typical lung lesions on computed tomography (CT) scan. DESIGN, SETTING AND PARTICIPANTS: This case series is about three patients who presented to the emergency department of a community hospital in Montpellier, France, with acute abdominal pain. RESULTS: The three patients had an elevated C-reactive protein level. CT scans demonstrated no abdominal anomaly, but bilateral lung lesions at the lung bases, typical of COVID-19 lesions, were observed. COVID-19 RT-PCR tests were positive for the three patients.The patients were transferred to the COVID-19 centre for disease control at Montpellier University Hospital. As of 29 March 2020, two of those patients are still intubated in the intensive care unit (ICU) and the third was discharged home. CONCLUSION AND RELEVANCE: COVID-19 infections may present as an acute abdominal pain. In our case series, CT scan findings helped us to suspect the correct diagnosis, which was subsequently confirmed with COVID-19 RT-PCR tests.

Management of Primary Central Nervous System Lymphoma Using Intra-Arterial Chemotherapy With Osmotic Blood-Brain Barrier Disruption: Retrospective Analysis of the Sherbrooke Cohort.

BACKGROUND: Primary central nervous system lymphomas (PCNSL) are rare and aggressive CNS tumors. Current management involves high-dose methotrexate (HD-MTX) typically administered intravenously (IV), despite the existence of the blood-brain barrier (BBB), which significantly decreases its bioavailability. Cerebral intra-arterial chemotherapy (CIAC) coupled with osmotic BBB disruption (OBBBD) can theoretically circumvent this issue. METHODS: We performed a retrospective analysis of patients with newly diagnosed PCNSL treated with HD-MTX-based CIAC+OBBBD at our center between November 1999 and May 2018. OBBBD was achieved using a 25% mannitol intra-arterial infusion. Patients were followed clinically and radiologically every month until death or remission. Demographics, clinical and outcome data were collected from the medical record. All imaging studies were reviewed for evidence of complication and outcome assessment. Kaplan-Meier analyses were used to compute remission, progression-free survival (PFS) as well as overall survival times. Subgroup analyses were performed using the log rank test. RESULTS: Forty-four patients were included in the cohort. Median follow-up was 38 months. Complete response was achieved in 34 patients (79%) at a median of 7.3 months. Actuarial median survival and PFS were 45 months and 24 months, respectively. Age, ECOG and lesion location did not impact outcome. Complications included thrombocytopenia (39%), neutropenia (20%), anemia (5%), seizures (11%), stroke (2%), and others (20%). CONCLUSION: CIAC using HD-MTX-based protocols with OBBBD is a safe and well-tolerated procedure for the management of PCNSL. Our data suggests better PFS and survival outcomes compared to IV protocols with less hematologic toxicity and good tolerability, especially in the elderly.

Value of C-Arm Computed Tomography to Evaluate Stent Deployment During Femoro-Popliteal Revascularization.

PURPOSE: To compare the accuracy of C-arm computed tomography (CT) and digital subtraction angiography (DSA) in detecting incomplete stent expansion (ISE) after superficial femoral artery (SFA) stenting using intravascular ultrasound (IVUS) as a gold standard. MATERIALS: Fifty patients with symptomatic SFA occlusive disease requiring angioplasty were prospectively included. Once technical success (<30 % residual stenosis) was obtained on post-procedural DSA, C-arm CT and IVUS were acquired. DSA and C-arm CT examinations were reviewed by 2 investigators and correlated with IVUS. C-arm CT image quality was rated on a four-point scale. Doppler ultrasound was performed at 1-year follow-up. RESULTS: The ankle-brachial index was 0.69 ± 0.10 and 0.99 ± 0.40, respectively, pre- and post-procedure. C-arm CT imaging quality was rated as good or excellent in 80%. In-stent minimal luminal diameter (MLD) was evaluated at 4.71 ± 0.7 mm on DSA, 3.39 ± 0.6 mm on IVUS, and 3.12 ± 0.9 mm on C-arm CT. Compared to IVUS, DSA demonstrated an overestimation of MLD (p = 0.0001), an underestimation of ISE (DSA = 18.8% ± 7.6; IVUS = 29.8% ± 9) (p < 0.0001), and a poor inter-technique intra-class correlation coefficient (ICC = 0.24). No difference was observed between IVUS and C-arm CT in ISE as calculated by diameter (29.8 ± 9 vs. 28.2 ± 12.5%, p = 0.5) and area (30.2 ± 8.4 vs. 33.3 ± 9.5%, p = 0.2). Inter-technique ICC between C-arm CT and IVUS was 0.72 [95%CI 0.49; 0.85] for MLA measurements. The inter-observer ICC for MLD and MLA measurements on C-arm CT were, respectively, estimated at 0.75 [95% CI 0.40, 0.89] and 0.77 [95% CI 0.43, 0.90)]. CONCLUSIONS: C-arm CT presents a better correlation with IVUS than DSA to determine lumen diameter and ISE immediately after percutaneous revascularization.

Multidetector cardiac tomography: a useful tool before cardiac resynchronization therapy.

BACKGROUND: Left ventricular lead placement in a suitable coronary vein is a key determi-nant of responsiveness to cardiac resynchronization therapy (CRT). Multidetector cardiac tomography (MDCT) is a non-invasive alternative to depict cardiac venous anatomy although coronary sinus (CS) retrograde venography (RV) is the gold standard. The aim of this study was to evaluate the accuracy of MDCT to determine the presence of CS tributaries before CRT. METHODS: A retrospective analysis of 41 consecutive patients eligible to CRT was performed. MDCT was assessed in all patients before CRT and RV was achieved in 39 patients. Both methods evaluated the presence of the inferior interventricular vein (IIV), posterior vein (PV) and lateral main vein (LMV). CS ostium diameter and distance between the CS ostium and right atrium (RA) lateral wall were also measured. RESULTS: The IIV was identified in 100% of MDCT and in 43.6% of RV. In comparison to RV, the MDCT's sensitivity to identify PV and LMV was 100% for both, kappa coefficient of 0.792 (CI 95% 0.46-0.93) and 0.69 (CI 95% 0.46-0.91), respectively. There was no significant difference between ischemic and non-ischemic patients regarding the presence of PV or LMV. Median CS antero-posterior diameter was 10.3 mm (IQR 7.5-13) and supero-inferior was 14.1 mm (IQR 11.5-17) (p < 0.01). A positive correlation (p < 0.001) between echocardiographic RA area and the distance from CS ostium to the RA lateral wall in the MDCT was observed. CONCLUSIONS: MDCT is as accurate as RV to depict CS and its tributaries (IIV, PV, LMV), and it could be useful as a non-invasive technique before CRT.

Down-regulation of the transcription factor ZAC1 upon pre- and postconditioning protects against I/R injury in the mouse myocardium.

AIMS: Myocardial infarction leads to heart failure and death. Ischaemic preconditioning (PreC) and postconditioning (PostC) reduce infarct size in animal models and human. Zac1 was identified as the only gene related to apoptosis and jointly down-regulated upon PreC and PostC. The aim of our study was to investigate the role of Zac1 down-regulation during ischaemia-reperfusion (I/R) in vivo. METHODS AND RESULTS: C57BL/6 mice were submitted to myocardial I/R injury, PreC, or PostC protocols. QPCR and immunochemistry showed that Zac1 expression was down-regulated both at the transcriptional and the protein levels upon PreC and PostC. Zac1(-/-) Knockout mice (n = 7) developed smaller infarcts (54%) than Zac1(+/+) littermates (n = 8) and decreased apoptosis (61.7%) in the ischaemic part of the left ventricle during I/R (Zac1(-/-), n = 6 vs. Zac1(+/+), n = 7; P = 0.0012). Mutants showed under control conditions a decrease of 53.9% in mRNA of Daxx, a pro-apoptotic protein playing a key role in I/R injuries (4.81 ± 0.77, n = 4 Zac1(-/-) mice vs. 10.44 ± 3.5, n = 7 Zac1(+/+) mice; P = 0.0121). CONCLUSION: Our study shows for the first time that Zac1 is down-regulated both at the transcriptional and protein levels upon PreC and PostC in wild-type mice. Moreover, inactivation of Zac1 in vivo is associated with a decreased amount of Daxx transcripts and, upon I/R injury, decreased infarct size and apoptosis. Altogether, our results show that Zac1 down-regulation plays a key role during cardioprotection against I/R injury and support the concept that cardioprotection regulates a network of interacting pro-apoptotic genes including Zac1 and Daxx.