Endoscopic removal of self-expandable metal stents from the esophagus (with video).
ABSTRACT Self-expandable metals stents (SEMSs) have increasingly been used as a temporary device to bridge chemoradiotherapy in patients with malignant esophageal disease or in patients with benign esophageal defects or stenosis.
To evaluate the outcome of removal of SEMSs in a large cohort of patients with benign and malignant esophageal disease.
Observational study with standardized treatment and follow-up.
Single university center.
Between 2001 and 2010, 95 consecutive patients referred for endoscopic SEMS extraction were included.
Endoscopic stent removal.
Technical and functional outcome and complications.
A total of 124 stent extractions were undertaken in 95 patients; both partially covered (68%) and fully covered (32%) SEMSs were removed. Three patients had 2 overlapping SEMSs in place. Successful primary removal was achieved in 89%; the secondary removal rate was 96%. Uncomplicated primary removal rate was significantly higher for fully covered versus partially covered stents (P = .035) and for single versus overlapping stents (P = .033). Patients with a complicated stent removal had the stent in place significantly longer compared with patients with an uncomplicated primary stent removal (126 days vs 28 days; P = .01). Surgical removal was required in 3 patients (2.4%). Six moderate and severe complications (5%) related to the endoscopic extraction occurred.
Retrospective, nonrandomized study design.
Primary endoscopic removal of an SEMS is feasible in the majority of patients with benign and malignant esophageal disease. A longer time that a stent is in place and the use of partially covered SEMSs both impede removal. Moreover, overlapping SEMSs should be avoided for temporary use because stent disintegration and subsequent complications may occur.
- SourceAvailable from: Víctor M García-Suárez[show abstract] [hide abstract]
ABSTRACT: We study the magnetic and electronic properties of defects in SnO2 using pseudopotential and all electron methods. Our calculations show that bulk SnO2 is nonmagnetic, but it shows magnetism with a magnetic moment around 4.00μB due to Sn vacancy (VSn). The magnetic moment comes mainly from O atoms surrounding VSn and Sn atoms, which couple antiferromagnetically with the O atoms in the presence of VSn. The coupling between different Sn vacancies is also studied and we found that these defects not only couple ferromagnetically but also antiferromagnetically and ferrimagnetically. Our calculations demonstrate that the experimentally observed giant magnetic moment of transition–metal-doped SnO2 can be attributed to VSn.Physical review. B, Condensed matter 11/2008; 78(18).
- [show abstract] [hide abstract]
ABSTRACT: We demonstrate, both theoretically and experimentally, that cation vacancy can be the origin of ferromagnetism in intrinsic dilute magnetic semiconductors. The vacancies can be controlled to tune the ferromagnetism. Using Li-doped ZnO as an example, we found that while Li itself is nonmagnetic, it generates holes in ZnO, and its presence reduces the formation energy of Zn vacancy, and thereby stabilizes the zinc vacancy. Room temperature ferromagnetism with p type conduction was observed in pulsed laser deposited ZnO:Li films with certain doping concentration and oxygen partial pressure.Physical Review Letters 04/2010; 104(13):137201. · 7.94 Impact Factor
- Advanced Materials 10/2008; 20(24):4679 - 4683. · 14.83 Impact Factor