ABSTRACT
Objective. To validate the utility of 4D Blood Flow and Navier-Stokes equations to create relative pressure (RP) maps in the aorta and pulmonary artery (PA) in healthy volunteers and patients with repaired tetralogy of Fallot (TOF). Methods. A 4D flow sequence of whole heart and its major vessels was acquired in 10 healthy volunteers and 6 patients with repaired TOF. The root of the ascending aorta was used as the reference point to calculate RP along five different points of this area. In addition, relative pressure of both right and left PA was measured as correlated to absolute pressure. Results. Patients with repaired TOF showed greater pulmonary artery (PA) relative pressure differences between maximum and minimum values when compared to volunteers (p <0.05). Additionally, aortic relative pressures had an excellent correlation with published data, whether using 4D flow or by catheterization. Conclusions. 4D Flow MRI may represent a new non-invasive and non operator-dependent diagnostic tool in CV disease management.
Objetivo. Utilizar 4D Flow y las ecuaciones de Navier-Stokes para obtener mapas de presiones relativas (PR) en la Aorta y Arteria Pulmonar (AP) de voluntarios y pacientes con Tetralogía de Fallot reparada (TOFr). Métodos. En 10 voluntarios y 6 pacientes con TOFr se adquirió la secuencia 4D flow del corazón y sus principales vasos. La raíz de la Aorta Ascendente se utilizó como referencia para calcular las PR a esta zona en cinco puntos distintos. Además, se midió la PR de la AP derecha e izquierda respecto a la AP. Resultados. Los pacientes con TOFr tuvieron diferencias de PR entre los valores máximos y mínimos más grandes que los voluntarios en la AP (p<0,05). Adicionalmente, las PR de la aorta tuvieron una excelente correlación con datos publicados utilizando 4D flow y mediante cateterización. Conclusiones. 4D Flow podría constituir una nueva herramienta diagnóstica, no invasiva, ni operador dependiente, en el manejo de patologías CV.
Subject(s)
Middle Aged , Aorta, Thoracic/physiopathology , Pulmonary Artery/physiopathology , Magnetic Resonance Imaging , Tetralogy of Fallot/physiopathology , Blood Flow Velocity , PressureABSTRACT
Objetivo del estudio: Proponer una nueva clasificación para la estenosis traqueal para estandarizar el manejo. Diseño: Estudio prospectivo realizado entre Octubre del 2002 y septiembre del 2005 en el Hospital San José. Pacientes: Se incluyeron 32 pacientes, 9 mujeres y 23 varones, con estenosis traqueal de etiología benigna (20 casos) y maligna (12 casos), de los cuales 4 tenían fístula traqueoesofágica. Método: Los pacientes fueron divididos en tres grupos de acuerdo a la morfología, longitud, número y localización de la o las lesiones que causaban estenosis. Según lo anterior Tipo I (7 casos; 22 por ciento), Tipo II (5 casos; 16 por ciento). Tipo III (20 casos; 62 por ciento). Intervenciones: Las estenosis Tipo I fueron tratadas mediante electrocoagulación. Las Tipo II con cirugía (resección y anastomosis traqueal termino-terminal primaria). Las Tipo III utilizando un stent dinámico. Resultados: La evolución posterior a la realización del procedimiento correspondiente a cada grupo, fue favorable, mejorando la capacidad funcional, demostrado por la realización de curva flujo-volumen y la desaparición de manifestaciones clínicas (según escala de Borg modificada) en el 69 por ciento de los pacientes, con una calidad de vida que mejora en el 100 por ciento de los casos, objetivado mediante el cuestionario de Saint-George. La mortalidad global es de 25 por ciento (8/32), no atribuible al tratamiento otorgado. Conclusiones: Consideramos que la clasificación propuesta es un método operacional, de fácil utilización, que permite planificar un tratamiento independientemente de la etiología de la estenosis traqueal, permitiendo asignar un pronóstico y mejorar calidad de vida.
Background: Tracheal stenosis is a common complication of intubation or tracheostomy. Aim: To report the experience with tracheal stenosis and propose a new classification to standardize its management. Material and Methods: Prospective study of 32 patients aged 17 to 79 years, 23 males. Twenty had a benign and 12 a malignant stenosis, four of which had tracheoesophageal fistula. Seven patients had a Type I stenosis, defined as a lesion of less than 1 cm in length, five had a type II lesion, defined as a diffuse lesion of less than 3 cm in length and 20 cases had a type III lesion defined as a stenosis of more than 3 cm, in length or multiple lesions or tracheomalacia. Patients with type I stenosis were treated with electro coagulation, those with type II lesions were subjected to a primary resection and tracheal end-to-end anastomosis and type III patients were treated using a dynamic stent. Results: Evolution after treatment was favorable with disappearance of clinical manifestations, improvement in functional capacity and modified Borg Scale score in 69 percent of the patients. Life quality and flow-volume curves improved in 100 percent of patients. Seven patients died due to progression of cancer and one committed suicide. Conclusions: The classification of tracheal stenosis in three types, depending on the morphology and extent of the lesion allows a better planning of treatment.
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Tracheal Stenosis/surgery , Tracheal Stenosis/classification , Stents , Anastomosis, Surgical , Clinical Evolution , Electrocoagulation , Prospective Studies , Severity of Illness Index , Treatment OutcomeABSTRACT
Phenotypic diversity has been described in the central repeated region of the circumsporozoite protein (CSP) from Plasmodium vivax. Two sequences VK210 (common) and VK247 (variant) have been found widely distributed in P. vivax isolates from several malaria endemic areas around the world. A third protein variant called P. vivax-like showing a sequence similar to the simian parasite P. simio-ovale has also been described. Here, using an immunofluorescent test and specific monoclonal antibodies, we assessed the presence of two of these protein variants (VK210 and VK247) in laboratory produced sporozoite. Both sequences were found in parasite isolates coming from different geographic regions of Colombia. Interestingly, sporozoites carrying the VK247 sequence were more frequently produced in Anopheles albimanus than sporozoites with the VK210 sequence. This difference in sporozoites production was statistically significant (p <0.05, Kruskal-Wallis); not correlation was found with parameters as the total number of parasites or gametocytes in blood from human donors used to feed mosquitoes. Previous studies in the same region have shown a higher prevalence of anti-VK210 antibodies which in theory may suggest their role in blocking the development of sporozoites carrying the CSP VK210 sequence