Background: Transcatheter pulmonary valve implantation is an alternative for dysfunctional conduits. We report the first experience with the Melody™ valve implantation in Brazil. Methods: Patients with significant pulmonary stenosis or significant pulmonary insufficiency in conduits measuring 16 to 22 mm were enrolled. Standardized techniques were employed. The feasibility, safety and efficacy of this procedure were assessed. Results: From December 2013, ten patients (mean age and weight of 16.5 years and 49 kg, respectively) have undergone the procedure with a mean interval of 11.9 ± 8.6 years since the last surgery. Pulmonary insufficiency was an indication for treatment in three patients, pulmonary stenosis in two, and mixed lesion in five. The Melody™ valve was successfully implanted in all cases. Mean right ventricular systolic pressure and right ventricle/left ventricle ratio decreased from 49.2 ± 15.9 to 35.8 ± 5.7 mmHg and from 0.55 ± 0.18 to 0.39 ± 0.08 mmHg (p < 0.01 for both). Significant residual pulmonary stenosis or pulmonary insufficiency was not observed. One patient had a contained conduit tear requiring a covered stent and a second valve implantation. All patients were discharged within 72 hours. The valves were properly functioning in a mean follow-up of 4.1 ± 2.2 months with no complications. Conclusions: Transcatheter Melody™ valve implantation was feasible, safe and effective in our environment and in line with previously published data. Although more patients and a longer follow-up are required, cost-effectiveness studies should be performed for possible incorporation in the Brazilian public health system. DESCRIPTORS:Pulmonary valve stenosis. Pulmonary valve insufficiency. Tetralogy of Fallot. Prostheses and implants. Experiência Inicial com o Implante Percutâneo da Válvula Melody ® no Brasil Introdução: O implante percutâneo da válvula pulmonar é uma alternativa para condutos com disfunção. Descrevemos aqui a primeira experiência com o implante da válvula Melody ® no Brasil. Métodos: Foram selecionados pacientes com estenose ou insuficiência pulmonar significativa em condutos de 16 a 22 mm. Foram empregadas técnicas padronizadas. Factibilidade, segurança e eficácia desse procedimento foram avaliadas. Resultados: Desde dezembro de 2013, dez pacientes (média de idade e peso de 16,5 anos e 49 kg, respectivamente) foram submetidos ao procedimento com intervalo médio de 11,9 ± 8,6 anos desde a última cirurgia. Insuficiência pulmonar foi indicação para o tratamento em três pacientes, estenose em dois e lesão mista em cinco. A válvula Melody ® foi implantada com sucesso em todos os casos. A média da pressão sistólica do ventrículo direito e a relação ventrículo direito/ventrículo esquerdo diminuíram de 49,2 ± 15,9 para 35,8 ± 5,7 mmHg e de 0,55 ± 0,18 para 0,39 ± 0,08 mmHg (p < 0,01 para ambos). Não observamos estenose e nem insuficiência pulmonar residual significativa. Um paciente teve extravasamento contido requerendo um stent coberto e um segundo implante valvular. Todos os pacientes receber...
Transcatheter closure of ASDs in older children, adolescents, and adults using the FOD was highly successful in a wide range of anatomical scenarios with high closure rates and no complications in mid-term follow-up.
There were no significant differences between the two techniques, since the observed stresses are well below the flow stress of the material, ensuring good safety factor (ranging from 3.5 to 4.1).
The clinical-topographic findings lead to consider the infiltrative effects (broad lesions) are responsible for the motor impairment rather than compressive effects (located lesions).
Objective: This research presents a biomechanical analysis performed in the lumbar spine of a porcine animal model, considering a minimally invasive technique for the treatment of split fractures. Methods: Porcine spines were used to perform compression tests, considering three different approaches. Three groups were defined in order to verify and validate the proposed technique: a control group (1); spines with split fractures (2); and a treatment group (3). For the first group (control), spines were axially compressed until any kind of fracture occurred, in order to verify the strength of the structure. In the second group, split fractures were created to obtain the mechanical failure pattern of the model. In the third group, the split fractures were submitted to the proposed treatment, to verify the resistance achieved. The three groups were compared by means of axial compression tests. Statistical analysis was performed by ANOVA. Results: The control group (intact spine) and the treated split fracture group presented similar results (p>0.05), differing from the results for the untreated split fracture group (p<0.05). Conclusions: The tests performed in order to determine the behavior and strength of the lumbar spine when subjected to axial compression provided positive data for the development of a minimally invasive technique capable of restoring split fractures of the spine. Level of evidence III; Experimental research.
OBJETIVO: Avaliar os pacientes acometidos por fraturas toracolombares e tratados por instrumentação e artrodese por acesso posterior. MÉTODOS: Foi realizada análise comparativa de duas técnicas de fixação utilizando parafusos pediculares associados à fixação curta e longa. A avaliação dos pacientes foi realizada por meio de escalas de dor (EVA, escala visual analógica), avaliação funcional (Oswestry) e por critérios clínicos e radiográficos. RESULTADOS: Foram observados 70,3% pacientes do sexo masculino e 29,7% do sexo feminino, com média de idade de 43 anos e tempo de seguimento médio de 39 meses. A maioria dos pacientes apresentou quadro neurológico Frankel E no momento da coleta dos dados (83,8%). A grande maioria dos pacientes apresentou fraturas em L1 (51,4%) do tipo A3 (63,6%). Entre os pacientes incluídos na pesquisa, em 62,2% foi realizada artrodese curta e em 37,8%, artrodese longa. Observou-se uma média de 2,7 na escala de dor e 11,2 na escala de Oswestry. CONCLUSÃO: Não foram observadas diferenças estatisticamente significativas entre as duas técnicas quando considerados os parâmetros relacionados com dor, escala de Oswestry, idade e sexo dos pacientes.
Clinical Experience with Amplatzer ® Vascular Plugs Background: The Amplatzer ® vascular plugs I and II (AVPs I and II) are low profile self-expandable devices made of nitinol, designed for vascular occlusions. We report our experience with these devices in two tertiary referral hospitals. Method: Retrospective study of patients undergoing vascular occlusion procedures with AVPs since 2005. The devices were 30%-50% larger than the target vessel, deployed under general anesthesia via femoral and internal jugular vein or femoral and brachial artery, and delivered through guiding catheters or 5 F to 8 F long sheaths. Results: Fourteen patients (50% male) at a median age of 5 years (11 months to 70 years) and a median weight of 15 kg (8 kg to 67 kg) were identified. Seventeen AVPs were used: 2 AVPs II and 15 AVPs I, with a diameter ranging from 4 mm to 16 mm. In 3 patients with more than one vessel to occlude, 2 AVPs were implanted in each vessel. In 3 patients with coronary fistula total occlusion of the vessels occurred after 24 hours. In 2 patients with modified Blalock-Taussig shunts, there was total occlusion of the anastomosis, with the use of additional coils in one. In 3 patients with venovenous fistulas after Glenn or Fontan operations, there was complete occlusion of the vessels and improved saturation, with the use of additional coils in one. Another patient with venovenous fistula had mild residual shunt in the lab and total occlusion observed at echocardiographic monitoring within 24 hours. Two patients with multiple pulmonary arteriovenous malformations underwent closure using the AVP, other Amplatzer devices and Gianturco's coils, with minimal residual shunts in all cases. In 2 patients with systemic-pulmonary collaterals in the postoperative period of pulmonary atresia and VSD repair, there was complete occlusion with the aid of additional coils, one immediately after the procedure and the other within 24 hours. In one patient with scimitar syndrome the systemic collateral vessel was totally occluded. There was no embolization or death. Conclusion: The AVPs were appro-RESUMO
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