Topological isoconductance signatures in Majorana nanowires.

We consider transport properties of a hybrid device composed by a quantum dot placed between normal and superconducting reservoirs, and coupled to a Majorana nanowire: a topological superconducting segment hosting Majorana bound states (MBSs) at the opposite ends. It is demonstrated that if highly nonlocal and nonoverlapping MBSs are formed in the system, the zero-bias Andreev conductance through the dot exhibits characteristic isoconductance profiles with the shape depending on the spin asymmetry of the coupling between the dot and the topological superconductor. Otherwise, for overlapping MBSs with less degree of nonlocality, the conductance is insensitive to the spin polarization and the isoconductance signatures disappear. This allows to propose an alternative experimental protocol for probing the nonlocality of the MBSs in Majorana nanowires.

[Anatomic reconstruction of native coronary arteries and vein graft with less shortening wallstent]. / Reconstrução anatômica das artérias coronárias nativas e das pontes de safena utilizando less shortening wallstent.

PURPOSE: To evaluate the advantage of the wallstent in the treatment of long or multiple lesions. METHODS: Thirty eight patients with mean age 66 years underwent wallstent implantation. Fourteen had lesions in the left anterior descending, 12 in the right coronary, nine in the circumflex and four in a vein graft. The technique for implantation requires an accurate quantification of the vessel diameter, because the chosen stent should be 1.5 mm larger than the target vessel. A new technique using additional inflations with high pressure balloons was applied. RESULTS: Successful implantation occurred in 95%. We did not have success in two patients. One of them due to damage in the stent and the other to unsuccessful liberation. Both patients were submitted to conventional angioplasty without complications. CONCLUSION: The wallstent implantation can be successfully performed with high success rate, but late angiographic results still demand further studies.

Reconstrução anatômica das artérias coronárias nativas e das pontes de safena utilizando Less Shortening Wallstent / Anatomic reconstruction of native coronary arteries and vein graft with the Less Shortening SelfÄExpandable Wallstent

OBJETIVO Ä Avaliar a utilizaçäo de apenas um stent, owallstent (WS), no tratamento de lesöes longas (LL) ou múltiplas (LM). MÉTODOS Ä Trinta e oito pacientes com idades variando de 42Ä82 (m=66) anos, sendo por cento do sexo masculino. Os vasos tratados foram: descendente anterior (14 pacientes); coronária direita (12); circunflexa (9) e pontes de safena (4). Cinco pacientes necessitaram de 2 stents: 4 PalmazÄSchatz no segmento proximal do vaso e um que recebeu dois WS com diâmetro maior ou igual a 1,5mm do diâmetro nominal do vaso.Todos os pacientes necessitaram de hiperinsuflação após o implante do WS. RESULTADOS - O sucesso do implante foi de 95 por cento. Os dois casos de insucesso foram: um devido à fratura do sistema e outro à soltura incompleta. Ambos, submetidos à angioplastia convencional com sucesso. Não houve complicaçöes nesta série. CONCLUSÄO - O WS foi efetivo no tratamento de LL e LM com alto índice de sucesso imediato e sem complicaçöes.