Bio-MOFs based on natural phenolic, hematoxylin leverages biomedical applications: enzyme inhibition, antioxidant, and antibacterial properties.

Here, using natural hematoxylin (HT) as linker, metal-organic frameworks (MOFs) from Cu(II), Fe(II), and Fe(III) ions was prepared. The SEM images and DLS analyses revealed HT-based MOFs are

Cell Staining Microgels Derived from a Natural Phenolic Dye: Hematoxylin Has Intriguing Biomedical Potential.

Hematoxylin (HT) as a natural phenolic dye compound is generally used together with eosin (E) dye as H&E in the histological staining of tissues. Here, we report for the first time the polymeric particle preparation from HT as poly(Hematoxylin) ((p(HT)) microgels via microemulsion method in a one-step using a benign crosslinker, glycerol diglycidyl ether (GDE). P(HT) microgels are about 10 µm and spherical in shape with a zeta potential value of -34.6 ± 2.8 mV and an isoelectric point (IEP) of pH 1.79. Interestingly, fluorescence properties of HT molecules were retained upon microgel formation, e.g., the fluorescence emission intensity of p(HT) at 343 nm was about 2.8 times less than that of the HT molecule at λex: 300 nm. P(HT) microgels are hydrolytically degradable and can be controlled by using an amount of crosslinker, GDE, e.g., about 40%, 20%, and 10% of p(HT) microgels was degraded in 15 days in aqueous environments for the microgels prepared at 100, 200, and 300% mole ratios of GDE to HT, respectively. Interestingly, HT molecules at 1000 mg/mL showed 22.7 + 0.4% cell viability whereas the p(HT) microgels exhibited a cell viability of 94.3 + 7.2% against fibroblast cells. Furthermore, even at 2000 mg/mL concentrations of HT and p(HT), the inhibition% of α-glucosidase enzyme were measured as 93.2 ± 0.3 and 81.3 ± 6.3%, respectively at a 0.03 unit/mL enzyme concentration, establishing some potential application of p(HT) microgels for neurogenerative diseases. Moreover, p(HT) microgels showed two times higher MBC values than HT molecules, e.g., 5.0 versus 2.5 mg/mL MIC values against Gram-negative E. coli and Gram-positive S. aureus, respectively.

Prediction of mortality and the development of critical illness in the course of COVID-19 with tertiary hospital data: vaccines? Critical illness scores? Mortality scores?

OBJECTIVE: Even though COVID-19 affects some risk groups more severely than others, there are still unknowns concerning the intensive care procedure and death in non-risk categories, making it vital to identify critical sickness and fatality risk factors at this time. The purpose of this study was to look into the efficacy of critical illness and mortality scores, as well as other risk factors in COVID-19. PATIENTS AND METHODS: Two hundred twenty-eight inpatients diagnosed with COVID-19 were included in the study. Sociodemographic, clinical, and laboratory data were recorded and risk calculations were made with the help of web-based patient data-based calculation programs called COVID-GRAM Critical Illness and 4C-Mortality score. RESULTS: The median age of 228 patients included in the study was 56.5 years, 51.3% of them were males, and ninety-six (42.1%) were unvaccinated. According to the multivariate analysis, the factors affecting the development of critical illness were cough [odds ratio=0.303, 95% CI (0.123,0.749), p=0.010], creatinine [odds ratio=1.542, 95% CI (1.100, 2.161), p=0.012], respiratory rate [odds ratio=1.484, 95% CI (1.302, 1.692), p=0.000], COVID-GRAM Critical Illness Score [odds ratio=3.005, 95% CI (1.288, 7.011), p=0.011]. Factors affecting survival were vaccine status [odds ratio=0.320, 95% CI (0.127,0.802), p=0.015], blood urea nitrogen (BUN) [odds ratio=1.032, 95% CI (1.012, 1.053), p=0.002], respiratory rate [odds ratio=1.173, 95% CI (1.070, 1.285), p=0.001], COVID-GRAM-critical-illness score [odds ratio=2.714, 95% CI (1.123, 6.556), p=0.027]. CONCLUSIONS: The findings suggested that risk assessment might employ risk scoring, such as COVID-GRAM Critical Illness, and that immunization against COVID-19 will reduce the occurrence of mortality.

Role of mandibular anatomical structures in sexual dimorphism in Turkish population: a radiomorphometric CBCT study.

Sex determination is one of the primary concerns of forensic science. The cranial bones, pelvis, and mandible have been used for determining the sex of specimens. Because the mandible is robust and sexually dimorphic, studies have evaluated its metric and morphological traits. This study was designed as a retrospective study involving cone beam computed tomography (CBCT) images to assess sexual dimorphism of the mandible in the Turkish population. Total sample group consisted of 176 bimaxillary CBCT scans (71 males and 102 females; ages 19-67 years). Sixteen mandibular parameters were measured using two different software programmes. Measurements were recorded in various planes of three-dimensional (3D) reconstructions of the scans. All parameters aside from SIMaCD were found to be statistically significant. The highest diagnostic accuracy rate was associated with IMaF, and the overall accuracy rate of the fourteen parameters was found to be 80%.

Comparison of 2017 ILAE and Semiological seizure classifications before and after video-EEG monitoring in childhood epilepsy.

OBJECTIVE: Our aim in this study is to evaluate epilepsy classification in children with epilepsy before monitoring (based on information received from the family) and after monitoring (based on video-EEG) by comparing two separate classification systems, namely the 2017 International League Against Epilepsy (ILAE) and Semiological Seizure Classification (SSC) systems. Classifications and methods were compared in terms of simplicity, intelligibility, and applicability during daily outpatient care. PATIENTS AND METHODS: The study was performed with 230 recorded seizures of 173 patients aged between 1 and 18 years who underwent video-EEG monitoring and clinical seizure recordings. Seizure types and video-EEG data of the patients were recorded. Seizures were first classified based on information obtained from the parents of the patients in interviews, recorded as "before video-EEG monitoring classification," and a second characterization, based on video EEG-monitoring, was subsequently recorded as "after video-EEG monitoring classification". The consistency of both seizure classifications was evaluated. RESULTS: For both classifications, autonomic seizures were the least congruent seizures (κ=0.27, κ=-0.005). The families generally described the seizures very well; the consistency before and after video-EEG monitoring was good. Focal seizures with impaired awareness were most common in the 2017 ILAE classification (κ=0.6), while for the SSC simple motor seizures were most common (κ=0.84). Among subtypes, clonic-tonic seizures were the most common, and the second most common subtype was dialeptic (κ=0.67). Overall, the harmony between the SSC and ILAE systems was good. The rate of good and excellent coefficients of concordance for both the SSC and 2017 ILAE was determined as 77.8% for the expanded SSC, 48% for the 2017 ILAE, 71.4% for the basic SSC, and 60% for the 2017 ILAE. CONCLUSIONS: In practice, it is difficult to determine seizure patterns reliably in cases of childhood epilepsy. Parents, however, can generally describe seizures very well. Although the SSC seems to be superior, both the SSC and 2017 ILAE systems can be applied in daily use. Such classification enables the rise of new concepts and a better understanding of disease groups. The continuing development of classification systems will lead to advancements for patients.

Electrical status epilepticus during sleep (ESES) in benign childhood epilepsy with Centrotemporal spikes (BCECTS): insights into predictive factors, and clinical and EEG outcomes.

OBJECTIVE: Benign childhood epilepsy with centro-temporal spikes (BCECTS), otherwise known as benign rolandic epilepsy, is the most common focal epilepsy in childhood. This study aimed to evaluate the development and resolution of ESES in children with BCECTS and evaluate the clinical and electroencephalography (EEG) parameters associated with prognosis. PATIENTS AND METHODS: Resolution of ESES was defined as the reduction of the spike-wave index (SWI) to <50%. The SWI short method, measurements from the first 180 s of non-rapid eye movement; and the conventional method, measurements from total NREM stage 2, SW count during the first 60 and 180 s of NREM, SW localization, and ESES type were determined. RESULTS: Of a total of 126 BCECTS patients, 33, including 13 females, 20 males, who developed ESES during follow-up, were included in the study. ESES remission was observed in 42.4% (n = 14) of the patients. The median time to remission was 10.5 months. The rate of resolution was 87.9 % for the entire population. The mean age at resolution was 9.8 ± 2.05 years and the mean time to resolution was 8.8 months. CONCLUSIONS: The data demonstrated that age at ESES diagnosis, the time between BCECTS diagnosis and the onset of ESES, time to resolution of ESES, ESES remission, and seizure freedom after ESES were significantly associated with prognosis. The early recognition of ESES evolution in children with BECTS, the better understanding of the relationship between age at ESES diagnosis and remission and prognosis, and timely intervention can prevent long-term sequelae.

Safety, Efficacy, and Durability of Stent-Assisted Coiling Treatment of M2 (Insular) Segment MCA Aneurysms.

BACKGROUND AND PURPOSE: Most distal MCA aneurysms are located within the insular segment, which lies between the limen insulae and circular sulcus. However, experience is limited in the microsurgical and endovascular management of insular segment MCA aneurysms. In this multicenter retrospective case series, we aimed to investigate the safety, efficacy, and durability of stent-assisted coiling for treatment of insular segment MCA aneurysms. MATERIALS AND METHODS: A retrospective review was performed to identify patients with insular MCA aneurysms that were treated with stent-assisted coiling. The technical success of the procedures and the initial and follow-up clinical and angiographic outcomes were assessed. Periprocedural and delayed complications were reviewed. RESULTS: Twenty-seven aneurysms in 27 patients with a mean age of 53.3 (SD,11.3) years were included. The mean size of the aneurysms was 6.3 (SD 2.6) mm. Endovascular procedures were successfully performed in all patients. Immediate postprocedural angiography revealed complete aneurysm occlusions in 81.5%. Periprocedural complications developed in 7.4% without causing permanent morbidity. A delayed thromboembolic complication resulted in a minor permanent morbidity in 1 patient (3.7%). There was no mortality. The mean duration of angiographic follow-up was 19.5 (SD, 9.8) months. The last follow-up examinations showed complete occlusion in 92.6%. During the follow-up period, none of the treated aneurysms showed recanalization. CONCLUSIONS: The results of this study demonstrate that stent-assisted coiling with a low-profile self-expandable stent is a feasible and relatively safe technique for endovascular treatment of insular segment complex MCA aneurysms. Additionally, it provides an effective and durable treatment for insular MCA aneurysms.

Chondroitin Sulfate-Based Cryogels for Biomedical Applications.

Cryogels attained from natural materials offer exceptional properties in applications such as tissue engineering. Moreover, Halloysite Nanotubes (HNT) at 1:0.5 weight ratio were embedded into CS cryogels to render additional biomedical properties. The hemolysis index of CS cryogel and CS:HNT cryogels was calculated as 0.77 ± 0.41 and 0.81 ± 0.24 and defined as non-hemolytic materials. However, the blood coagulation indices of CS cryogel and CS:HNT cryogels were determined as 76 ± 2% and 68 ± 3%, suggesting a mild blood clotting capability. The maximum% swelling capacity of CS cryogel was measured as 3587 ± 186%, 4014 ± 184%, and 3984 ± 113%, at pH 1.0, pH 7.4 and pH 9.0, respectively, which were reduced to 1961 ± 288%, 2816 ± 192, 2405 ± 73%, respectively, for CS:HNT cryogel. It was found that CS cryogels can hydrolytically be degraded 41 ± 1% (by wt) in 16-day incubation, whereas the CS:HNT cryogels degraded by 30 ± 1 wt %. There is no chelation for HNT and 67.5 ± 1% Cu(II) chelation for linear CS was measured. On the other hand, the CS cryogel and CS:HNT cryogel revealed Cu(II) chelating capabilities of 60.1 ± 12.5%, and 43.2 ± 17.5%, respectively, from 0.1 mg/mL Cu(II) ion stock solution. Additionally, at 0.5 mg/mL CS, CS:HNT, and HNT, the Fe(II) chelation capacity of 99.7 ± 0.6, 86.2 ± 4.7% and only 11.9 ± 4.5% were measured, respectively, while no Fe(II) was chelated by linear CS chelated Fe(II). As the adjustable and controllable swelling properties of cryogels are important parameters in biomedical applications, the swelling properties of CS cryogels, at different solution pHs, e.g., at the solution pHs of 1.0, 7.4 and 9.0, were measured as 3587 ± 186%, 4014 ± 184%, and 3984 ± 113%, respectively, and the maximum selling% values of CS:HNT cryogels were determined as 1961 ± 288%, 2816 ± 192, 2405 ± 73%, respectively, at the same conditions. Alpha glucosidase enzyme interactions were investigated and found that CS-based cryogels can stimulate this enzyme at any CS formulation.

A new COVID-19 prediction scoring model for in-hospital mortality: experiences from Turkey, single center retrospective cohort analysis.

OBJECTIVE: Although many studies reported prognostic factors proceeding to severity of COVID-19 patients, in none of the article a prediction scoring model has been proposed. In this article a new prediction tool is presented in combination of Turkish experience during pandemic. MATERIALS AND METHODS: Laboratory and clinical data of 397 over 798 confirmed COVID-19 patients from Gülhane Training and Research Hospital electronic medical record system were included into this retrospective cohort study between the dates of 23 March to 18 May 2020. Patient demographics, peripheral venous blood parameters, symptoms at admission, in hospital mortality data were collected. Non-survivor and survivor patients were compared to find out a prediction scoring model for mortality. RESULTS: There was 34 [8.56% (95% CI:0.06-0.11)] mortality during study period. Mean age of patients was 57.1±16.7 years. Older age, comorbid diseases, symptoms, such as fever, dyspnea, fatigue and gastrointestinal and WBC, neutrophil, lymphocyte count, C-reactive protein, neutrophil-to-lymphocyte ratio of patients in non-survivors were significantly higher. Univariate analysis demonstrated that OR for prognostic nutritional index (PNI) tertile 1 was 18.57 (95% CI: 4.39-78.65, p<0.05) compared to tertile 2. Performance statistics of prediction scoring method showed 98% positive predictive value for criteria 1. CONCLUSIONS: It is crucial to constitute prognostic clinical and laboratory parameters for faster delineation of patients who are prone to worse prognosis. Suggested prediction scoring method may guide healthcare professional to discriminate severe COVID-19 patients and provide prompt intensive therapies which is highly important due to rapid progression leading to mortality.

Ecosystem-based fisheries management forestalls climate-driven collapse.

Climate change is impacting fisheries worldwide with uncertain outcomes for food and nutritional security. Using management strategy evaluations for key US fisheries in the eastern Bering Sea we find that Ecosystem Based Fisheries Management (EBFM) measures forestall future declines under climate change over non-EBFM approaches. Yet, benefits are species-specific and decrease markedly after 2050. Under high-baseline carbon emission scenarios (RCP 8.5), end-of-century (2075-2100) pollock and Pacific cod fisheries collapse in >70% and >35% of all simulations, respectively. Our analysis suggests that 2.1-2.3 °C (modeled summer bottom temperature) is a tipping point of rapid decline in gadid biomass and catch. Multiyear stanzas above 2.1 °C become commonplace in projections from ~2030 onward, with higher agreement under RCP 8.5 than simulations with moderate carbon mitigation (i.e., RCP 4.5). We find that EBFM ameliorates climate change impacts on fisheries in the near-term, but long-term EBFM benefits are limited by the magnitude of anticipated change.

Natural Celluloses as Catalysts in Dehydrogenation of NaBH4 in Methanol for H2 Production.

Cellulose, the most abundant renewable biopolymer, exists in many forms, such as microgranular cellulose (MGCell), sigmacell cellulose (SCell), cellulose fibers (FCell), and α-cellulose (AlfaCell). Several of these cellulose forms were protonated with an amine-containing agent polyethyleneimine (PEI), and the modified celluloses (XCell-PEI+) were studied as catalysts in methanolysis of NaBH4 for hydrogen (H2) generation. It was found that the SCell-PEI+-catalyzed reaction is the fastest one among the modified celluloses with a hydrogen generation rate of 5520 ± 119 mL H2/(g of catalyst × min). The activation energies of MGCell-PEI+, SCell-PEI+, FCell-PEI+, and AlfaCell-PEI+ were determined as +21.7, +23.4, +24.8, and + 21.8 kJ/mol, respectively. Reusability of catalysts was investigated, and regeneration of cellulose based catalysts after the fifth cycle could be readily achieved by HCl treatment to completely recover its activity. Therefore, PEI-modified-protonated cellulose forms constitute sustainable, re-generable, and renewable catalysts for production of H2, an environmentally benign green energy carrier.

Adaptive tuning of infrared emission using VO2 thin films.

Phase-transition materials provide exciting opportunities for controlling optical properties of photonic devices dynamically. Here, we systematically investigate the infrared emission from a thin film of vanadium dioxide (VO2). We experimentally demonstrate that such thin films are promising candidates to tune and control the thermal radiation of an underlying hot body with different emissivity features. In particular, we studied two different heat sources with completely different emissivity features, i.e. a black body-like and a mirror-like heated body. The infrared emission characteristics were investigated in the 3.5-5.1 µm spectral range using the infrared thermography technique which included heating the sample, and then cooling back. Experimental results were theoretically analyzed by modelling the VO2 film as a metamaterial for a temperature range close to its critical temperature. Our systematic study reveals that VO2 thin films with just one layer 80 nm thick has the potential to develop completely different dynamic tuning of infrared radiation, enabling both black-body emission suppression and as well as mirror emissivity boosting, in the same single layer device. Understanding the dynamics and effects of thermal tuning on infrared emission will benefit wide range of infrared technologies including thermal emitters, sensors, active IR filters and detectors.

Metabolic syndrome is not uncommon in treatment-naïve rheumatoid arthritis patients.

OBJECTIVES: Rheumatoid arthritis (RA) is an independent risk factor for cardiovascular disease (CVD). Glucocorticoids are often used in the management of RA and might also contribute to the increased risk of metabolic syndrome (metS). Identifying metabolic alterations earlier and treating them together with disease-modifying therapy may be associated with better outcomes. Here, we aimed to investigate the frequency of metS and its components in treatment-naïve RA patients. METHODS: Fifty-three newly diagnosed treatment-naïve RA patients and 55 control subjects were enrolled. MetS was diagnosed using Adult Treatment Panel III report-defined criteria. We evaluated the metS-related metabolic and anthropometric alterations between the groups. RA patients were subdivided and those with and without metS were also compared with respect to disease-related parameters. RESULTS: MetS was more common in treatment-naïve newly diagnosed RA patients compared to controls (25 of 53 (47.1%) vs 9 of 55 (16.4%), respectively (p = 0.001; OR, 4.56; 95% CI 1.86-11.16). All evaluated anthropometric and metabolic parameters were similar in both groups. However, there was a trend to lower LDL and HDL cholesterol levels in RA patients. Furthermore, among those with metS, the number of fulfilled metS criteria items were higher in RA patients, compared to controls (p < 0.001). Interestingly, more RA patients fulfilled metS criteria with a glucose measurements item compared to controls (p < 0.001). CONCLUSION: MetS was more common in newly diagnosed and treatment-naïve RA patients compared to controls. MetS, along with tendency to present paradoxical and atherogenic lipid profiles in RA patients, may be among the underlying mechanisms of increased CVD.

Enhancement of biocompatibility and carbohydrate absorption control potential of rosmarinic acid through crosslinking into microparticles.

Rosmarinic acid (RA), a bioflavonoid and antioxidant that exists in plants of the Lamiaceae family, was crosslinked into particles as poly(Rosmarinic Acid) (p(RA)) via an emulsion crosslinking method. The particles were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, solid state nuclear magnetic resonance 13C NMR spectroscopy, and thermal gravimetric analysis. The zeta potential values of p(RA) particles were determined at different pHs; the isoelectric point was estimated as pH 1.2. The release of monomeric RA from the particles at 37.5 °C was found to be similar at different pHs, 1.0, 7.4, and 11.0. The effects of p(RA) on hemolysis and coagulation were found to be minimal. The antioxidant activity of p(RA) particles and RA monomer were almost indistinguishable suggesting that p(RA) particles may be used as an antioxidant. On a per weight basis, p(RA) particles were ~66% less cytotoxic to mammalian cells that RA monomer, as assessed using COS-1 cells. In addition, p(RA) was an 8.6-fold stronger inhibitor of α-glycosidase than RA; the IC50s of the monomer and particles were 0.121 and 0.014 mg/mL, respectively. The strong inhibitory effect of p(RA) on α-glycosidase, coupled with its reduced cytotoxicity and antioxidant activity, provide new opportunities for the use of p(RA).

Prevalence and predictors of gestational diabetes mellitus: a nationwide multicentre prospective study.

AIM: Prevalence rates of gestational diabetes mellitus (GDM) show considerable variation among different countries and regions of the world. The primary aim of this study was to determine the nationwide prevalence and predictors of GDM in Turkey. METHODS: We conducted prospective nationwide screening among pregnant women. Between August 2016 and November 2017, a total of 2643 pregnant women from 51 centres in 12 different regions were enrolled. A two-step screening method and Carpenter and Coustan criteria were used in the diagnosis of GDM. Clinical and biochemical data were obtained using electronic database software. RESULTS: The national prevalence of GDM was found to be 16.2% [95% confidence intervals (CI) 15.0% to 17.4%] without a significant difference between urban and rural regions. Women with GDM were older (mean age: 32 ± 5 vs. 28 ± 5 years, P < 0.001) and heavier (mean BMI: 27.2 ± 5.1 vs. 24.7 ± 4.7 kg/m2 , P < 0.001) than their counterparts without GDM. The prevalence of GDM tended to increase with age (< 25 years, 6.9%; 26-35 years, 15.6%; and 36-45 years, 32.7%; P < 0.001). Maternal age, maternal BMI, history of previous GDM and family history of diabetes mellitus were independent predictors of developing GDM (P < 0.05 for all). Low-risk women (age < 25 years, BMI < 25 kg/m2 , no family history of diabetes) comprised 10.7% of the total population and the prevalence of GDM in these women was 4.5% (95% CI 2.4% to 7.8%). CONCLUSION: The results of this nationwide study indicate that GDM is very common, affecting one in seven pregnancies in Turkey. Implementation of international guidelines on screening and management of this public health problem is required.

Comparing SARC-F with SARC-CalF to Screen Sarcopenia in Community Living Older Adults.

OBJECTIVE: To compare the diagnostic value of the SARC-F combined with calf circumference (SARC-CalF) with the standard SARC-F to screen sarcopenia in community-dwelling older adults. DESIGN: Cross-sectional, diagnostic accuracy study. SETTING: Geriatric outpatient clinic of a university hospital. PARTICIPANTS: Older adults >= 65 years. MEASUREMENTS: Muscle mass (bioimpedance analysis device), muscle strength (hand grip strength-Jamar hydraulic hand dynamometer), and physical performance (usual gait speed). Four currently used diagnostic criteria [European Working Group on Sarcopenia in Older People (EWGSOP), Foundation for the National Institutes of Health (FNIH), International Working Group on Sarcopenia (IWGS), and Society on Sarcopenia Cachexia and Wasting Disorders (SCWD) criteria] were applied. SARC-CalF was performed by using two different calf circumference threshold: standard cut-off 31 cm (SARC-CalF-31) and national cut-off 33 cm (SARC-CalF-33). The sensitivity/specificity analyses of the SARC-CalF and SARC-F tools were run. We used the receiver operating characteristics curves and the area under the receiver operating characteristics curves (AUC) to compare the diagnostic accuracy to identify sarcopenia. RESULTS: We included 207 subjects; 67 male and 140 female with a mean age of 74.6±6.7 years. The prevalence of sarcopenia ranged from 1.9% to 9.2%. The sensitivity of SARC-F was between 25% (EWGSOP) and 50% (IWGS); specificity was about 82%. For SARC-CalF-31 and SARC-CalF-33 sensitivity was in general similar -between 25-50%- which pointed out that SARC-CalF was not superior to SARC-F for sensitivity in this sample. Corresponding specificities for SARC-CalF-31 and SARC-CalF-33 were higher than SARC-F and were between 90-98%. Additionally, the AUC values, which indicates the diagnostic accuracy of a screening test, were in general higher for SARC-CalF-33 than the SARC-F and SARC-CalF-31. CONCLUSIONS: We reported that addition of calf circumference item to SARC-F tool improved the specificity and diagnostic accuracy of SARC-F but it did not improve the sensitivity in a community-dwelling Turkish older adult population sample that had low prevalence of sarcopenia. The performance of SARC-CalF tool to screen sarcopenia is to be studied in different populations and living settings.

Initial and Long-Term Outcomes of Complex Bifurcation Aneurysms Treated by Y-Stent-Assisted Coiling with Low-Profile Braided Stents.

BACKGROUND AND PURPOSE: Coiling complex intracranial bifurcation aneurysms often necessitates the implantation of double stents in various configurations, such as Y-stent placement. Low-profile braided stents have been introduced recently to facilitate the endovascular treatment of wide-neck aneurysms. We aimed to investigate the feasibility, safety, efficacy, and durability of Y-stent-assisted coiling with double low-profile braided stents for the treatment of complex bifurcation aneurysms. MATERIALS AND METHODS: A retrospective review was performed to identify patients who were treated using Y-stent-assisted coiling with low-profile braided stents. Technical success was assessed, as were initial and follow-up clinical and angiographic outcomes. Periprocedural and delayed complications were reviewed. Preprocedural and follow-up clinical statuses were assessed using the modified Rankin Scale. RESULTS: Forty patients with 40 intracranial aneurysms were included in the study. Y-stent placement was successfully performed in all cases. Immediate postprocedural digital subtraction angiography images revealed total aneurysm occlusion in 72.5% of cases. The mean angiographic follow-up time was 24.8 months. The last follow-up angiograms showed complete occlusion in 85% of patients. During follow-up, only 1 patient showed an increase in the filling status of the aneurysm and that patient did not require retreatment. There was no mortality in this study. The overall procedure-related complication rate, including asymptomatic complications, was 17.5%. A permanent morbidity developed in 1 patient (2.5%). CONCLUSIONS: The long-term angiographic and clinical outcomes of this retrospective study demonstrate that Y-stent-assisted coiling using low-profile braided stents is an effective, relatively safe, and durable endovascular treatment for wide-neck and complex bifurcation aneurysms.

Inverse-Designed Broadband All-Dielectric Electromagnetic Metadevices.

This paper presents a platform combining an inverse electromagnetic design computational method with additive manufacturing to design and fabricate all-dielectric metadevices. As opposed to conventional flat metasurface-based devices that are composed of resonant building blocks resulting in narrow band operation, the proposed design approach creates non-resonant, broadband (Δλ/λ up to >50%) metadevices based on low-index dielectric materials. High-efficiency (transmission >60%), thin (≤2λ) metadevices capable of polarization splitting, beam bending, and focusing are proposed. Experimental demonstrations are performed at millimeter-wave frequencies using 3D-printed devices. The proposed platform can be readily applied to the design and fabrication of electromagnetic and photonic metadevices spanning microwave to optical frequencies.

Flow Diversion with Low-Profile Braided Stents for the Treatment of Very Small or Uncoilable Intracranial Aneurysms at or Distal to the Circle of Willis.

BACKGROUND AND PURPOSE: The endovascular treatment of aneurysms located at or distal to the circle of Willis and not amenable to coiling remains a challenge. We report our experience with flow-diversion treatment using low-profile braided stents as a stent monotherapy procedure for treating distally located very small or uncoilable aneurysms. MATERIALS AND METHODS: We retrospectively reviewed our data bases to identify patients with aneurysms located at or distal to the circle of Willis who were treated with stent monotherapy using low-profile braided stents. The immediate and follow-up angiographic findings and clinical status of the patients were assessed. RESULTS: Twenty aneurysms in 19 patients were included in the study. The mean size of the aneurysms was 4.7 ± 2.4 mm. Patients were treated via telescopic implantation of 2 stents for 11 aneurysms; single-stent placement was used for the remaining aneurysms. The technical success rate was 95%. We observed a technical complication in 1 case (5.3%) and a late ischemic event in another (5.3%). The final angiographies during a mean follow-up of 14.7 months showed complete aneurysm occlusion in 73.7%. The complete occlusion rate of the aneurysms treated with telescopic stent placement was 81.8%. The modified Rankin scale scores of all patients at the last follow-up were between 0 and 2. CONCLUSIONS: Flow diversion with low-profile braided stents as a stent monotherapy procedure for very small or uncoilable intracranial aneurysms located at or beyond the circle of Willis is a promising, relatively safe, and durable endovascular procedure.

Genetic Alterations in Differentiated Thyroid Cancer Patients with Acromegaly.

AIM: Acromegaly is associated with increased thyroid cancer risk. We aimed to analyze the frequency of point mutations of BRAF and RAS genes, and RET/PTC, PAX8/PPARγ gene rearrangements in patients with acromegaly having differentiated thyroid cancers (DTC) and their relation with clinical and histological features. MATERIALS AND METHODS: 14 acromegalic patients (8 male, 6 female) with DTC were included. BRAF V600E and NRAS codon 61 point mutations, RET/PTC1, RET/PTC3, and PAX8/PPARγ gene rearrangements were analyzed in thyroidectomy specimens. We selected 14 non-acromegalic patients with DTC as a control group. RESULTS: 2 patients (14.3%) were detected to have positive BRAF V600E and 3 patients (21.4%) were detected to have NRAS codon 61 mutation. NRAS codon 61 was the most frequent genetic alteration. Patients with positive mutation had aggressive histologic features more frequently than patients without mutations. Comparison of the acromegalic and non-acromegalic patients with DTC revealed that BRAF V600E mutation was more frequent in non-acromegalic patients with DTC (14.2% vs. 64.3%, p=0.02). RET/PTC 1/ 3, PAX8/PPARγ gene rearrangements were not detected in any patient. None of the patients including the patients with positive point mutations had recurrence, and local and/or distant metastasis. CONCLUSION: NRAS codon 61 is the most frequent genetic alteration in this acromegaly series with DTC. Since acromegalic patients have lower prevalance of BRAF V600E mutation, BRAF V600E mutation may not be a causative factor in development of DTC in acromegaly. Despite the relation of BRAF V600E and NRAS codon 61 mutations with aggresive histopathologic features, their impact on tumor prognosis remains to be defined in acromegaly in further studies.