Electron-Electron Interactions in Sb-Doped SnO2 Thin Films

WOS: 000279504900005Electrical conductivity and Hall-effect measurements on undoped and Sb-doped SnO2 thin films prepared by the sol-gel technique were carried out as a function of temperature (55 K to 300 K). Structural characterizations of the films were performed by atomic force microscopy (AFM) and x-ray diffraction (XRD). A doping-induced metal-insulator transition (MIT) was observed. On the metallic side of the transition, the experimental data were interpreted in terms of electron-electron interactions (EEI). The existence of EEI was confirmed by excellent agreement between theoretical and experimental data. The experimental data on the insulator side of the transition were analyzed in terms of variable-range hopping (VRH) conduction. A complete set of parameters describing the properties of the localized electrons, including hopping energy, hopping distance, and the value of the density of states at the Fermi level, was determined.State of Planning Organization of TurkeyTurkiye Cumhuriyeti Kalkinma Bakanligi [2001K120590]; Ankara University BAPAnkara University [2007-07-45-054]This work is supported by the State of Planning Organization of Turkey under Grant No. 2001K120590 and the Ankara University BAP under Project Number 2007-07-45-054. We would also like to thank Prof. Dr. Yusuf Kagan Kadioglu and Ms. Murat Yavuz for providing XRD and AFM measurements

Safety and efficacy of Amplatzer duct occluder II and konar-MF™ VSD occluder in the closure of perimembranous ventricular septal defects in children weighing less than 10 kg

IntroductionDevice closure of perimembranous ventricular septal defects (pmVSD) is a successful off-label treatment alternative. We aim to report and compare the outcomes of pmVSD closure in children weighing less than 10 kg using Amplatzer Duct Occluder II (ADOII) and Konar-MF VSD Occluder (MFO) devices.MethodsRetrospective clinical data review of 52 children with hemodynamically significant pmVSD, and sent for transcatheter closure using ADOII and MFO, between January 2018 and January 2023. Baseline, procedural, and follow-up data were compared according to the implanted deviceResultsADOII devices were implanted in 22 children with a median age of 11 months (IQR, 4.1–14.7) and weight of 7.4 kg (IQR, 2.7–9.7). MFO devices were implanted in 30 children with a median age of 11 months (IQR, 4.8–16.6) and weight of 8 kg (IQR, 4.1–9.6). ADOII were implanted (retrograde, 68.1%) in defects with a median left ventricular diameter of 4.6 mm (IQR, 3.8–5.7) and right ventricular diameter of 3.5 mm (IQR, 3.1–4.9) while MFO were implanted (antegrade, 63.3%) in defects with a median left ventricular diameter of 7 mm (IQR, 5.2–11.3) (p > 0.05) and right ventricular diameter of 5 mm (IQR, 2.0, 3.5–6.2) (p < 0.05). The procedural and fluoroscopy times were shorter with the MFO device (p < 0.05). On a median follow-up of 41.2 months (IQR, 19.7–49.3), valvular insufficiency was not observed. One 13-month-old child (6.3 kg) with ADOII developed a complete atrioventricular heart block (CAVB) six months postoperative and required pacemaker implantation. One 11-month-old child (5.9 kg) with MFO developed a CAVB 3 days postoperative and the device was removed. At 6 months post-procedure, only one child with MFO still experiences a minor residual shunt. There was one arterio-venous fistula that resolved spontaneously.ConclusionBoth the MFO and ADOII are effective closure devices in appropriately selected pmVSDs. CAVB can occur with both devices. The MFO is inherently advantageous for defects larger than 6 mm and subaortic rims smaller than 3 mm. In the literature, our series represents the first study comparing the mid-term outcomes of MFO and ADOII devices in children weighing less than 10 kg

Aorta-right atrial tunnel closure using the transcatheter technique: a case of a 3-year-old child

Aorta-right atrial tunnel is a rare congenital defect. If it is not treated, critical complications can occur. Surgical closure is the treatment of choice, but with increasing experience in transcatheter techniques and the introduction of new occluder devices the percutaneous technique is now a successful modality for closure. In this paper, we report the case of a 3-year-old child with aorta-right atrial tunnel whose defect was closed with the vascular plug 4 device

Pulmonary Thromboembolism Associated with Pulmonary Venous Thrombus: A Paediatric Case Report

In this paper we present a young female patient who was admitted to the emergency unit with sudden chest pain, palpitations, and shortness of breath followed by syncope, and was diagnosed with pulmonary thromboemboli (PTE) by multislice spiral computed tomography. To the best of our knowledge, it is the first case in the literature of PTE accompanied by pulmonary thromboses with pulmonary venous thrombosis without surgery, trauma and malignancy

Pediatric cardiology Percutaneous atrial septal defect closure by using jugular venous access in a case with interrupted inferior vena cava

Femoral venous approach is the classical route of percutaneous atrial septal defect (ASD) closure. But in certain circumstances alternative routes are used. In this report percutaneous ASD closure in a case with interrupted vena cava by jugular venous approach is discussed. Percutaneous closure through femoral venous route was planned in a 6-year-old girl with ASD. Because of interrupted vena cava the jugular venous route was used. Having knowledge of this anatomical variation is important for interventionalists before performing femoral venous approach. Percutaneous transjugular venous access is a feasible alternative route in paediatric population for ASD closure

Syncope due to complete atrioventricular block and treatment with a transient pacemaker in acute rheumatic fever

Various rhythm and connection disorders can be seen in the acute phase of acute rheumatic fever. First degree atrioventricular block, one of the minor signs of acute rheumatic fever, is the most common connection disturbance in this disease. Complete atrioventricular block, which seriously affects the conduction pathways, is rare in the literature. A 15-year-old boy was admitted because of syncope caused by complete atrioventricular block and a temporary pacemaker was employed because of symptomatic complete atrioventricular block. The transient pacemaker treatment was terminated due to recovery of complete atrioventricular block on the third day of anti-inflammatory treatment. Acute rheumatic fever should be kept in mind as a possible cause of acquired complete atrioventricular block. Connection disturbances in acute rheumatic fever improve with anti-inflammatory treatment. Transient pacemaker treatment is indicated for patients with symptomatic transient complete atrioventricular block

Unusual right ventricle aneurysm and dysplastic pulmonary valve with mitral valve hypoplasia

We report a newborn with an unusual combination of aneurysmally dilated thin-walled right ventricle with hypertrophy of the apical muscles of the right ventricle. There was narrow pulmonary annulus, pulmonary regurgitation, and hypoplasia of the mitral valve and left ventricle. We propose that this heart represents a partial form of Uhl's anomaly

A successful balloon angioplasty procedure in a 1050 gram premature infant with coarctation of the aorta

Surgery is the primary treatment of aortic coarctation in all newborns, including low birth weight premature infants. Balloon angioplasty procedure in the treatment of native coarctation of the newborn is controversial due to high rates of restenosis and complications such as increased risk of aneurysm formation and damage to the peripheral artery involved in the intervention. Balloon angioplasty is often performed as a palliative treatment particularly in newborns with impaired cardiac functions indicating high rates of mortality. We believe that this procedure may be performed as a palliative treatment for low birth weight infants in centers lacking adequate surgical experience. Herein, we define a successful balloon angioplasty procedure which we carried out using the femoral artery route in a low birth weight premature infant with coarctation of the aorta

Syncope due to complete atrioventricular block and treatment with a transient pacemaker in acute rheumatic fever

Various rhythm and connection disorders can be seen in the acute phase of acute rheumatic fever. First degree atrioventricular block, one of the minor signs of acute rheumatic fever, is the most common connection disturbance in this disease. Complete atrioventricular block, which seriously affects the conduction pathways, is rare in the literature. A 15-year-old boy was admitted because of syncope caused by complete atrioventricular block and a temporary pacemaker was employed because of symptomatic complete atrioventricular block. The transient pacemaker treatment was terminated due to recovery of complete atrioventricular block on the third day of anti-inflammatory treatment. Acute rheumatic fever should be kept in mind as a possible cause of acquired complete atrioventricular block. Connection disturbances in acute rheumatic fever improve with anti-inflammatory treatment. Transient pacemaker treatment is indicated for patients with symptomatic transient complete atrioventricular block