ABSTRACT
Introducción: El objetivo de este estudio es evaluar l8mm frea reactividad traqueal tras la implantación de distintos stents metálicos autoexpandibles (SMAE). Material y métodos: Se utilizaron 40 conejos hembra de raza neozelandesa, que se dividieron en 4 grupos. En 3 grupos se implantaron SMAE: de acero (SA), de nitinol (NiTi) o stents liberadores de nitinol (SLF). El cuarto grupo fue el grupo de control (sin stent). Los stents se implantaron por vía percutánea bajo control fluoroscópico. Los animales se evaluaron mediante tomografía axial computarizada (TAC) multicorte y las tráqueas se extirparon para su estudio anatomopatológico (EAP). Los datos de la TAC y el EAP se analizaron estadísticamente y se correlacionaron. Resultados: El grupo que recibió SLF presentaba la mayor longitud de estenosis (20,51 ± 14,0nte a 5,84 ± 12,43 y 6,57 ± 6,54 mm en los grupos NiTi y SA, día 30; p < 0,05) y el mayor índice de formación de granulomas evidenciados mediante TAC (50% de los casos). El grupo al que se implantaron stents NiTi mostró el menor grado de estenosis (2,86 ± 6,91% frente a 11,28 ± 13,98 y 15,54 ± 25,95% en los grupos SLF y SA; p<0,05). En el estudio AP, el grupo SA presentó reactividad proliferativa intensa en comparación con los otros 2 grupos. En el grupo SLF se observó una respuesta destructiva en el 70% de animales, mientras que el stent NiTi fue el que menos reacción provocó. La TAC resultó ser superior para detectar el engrosamiento (correlación positiva de un 68,9%; p < 0,001) que para la observación de granulomas (n.s.). Conclusiones: El grupo SA desarrolló granulomas y estenosis significativas. El stent NiTi fue el que menos reacción indujo, mientras que el SLN provocó lesiones importantes que podrían estar relacionadas con la dosis de fármaco. Por consiguiente, este tipo de SLF no se recomienda para el tratamiento de la estenosis traqueobronquial
Introduction: The objective of this study was to assess tracheal reactivity after the deployment of different self-expandable metal stents (SEMS). Material and methods: Forty female New Zealand rabbits were divided into four groups. Three groups received three different SEMS: steel (ST), nitinol (NiTi), or nitinol drug-eluting stent (DES); the fourth group was the control group (no stent). Stents were deployed percutaneously under fluoroscopic guidance. Animals were assessed by multi-slice, computed tomography (CT) scans, and tracheas were collected for anatomical pathology (AP) study. Data from CT and AP were statistically analyzed and correlated. Results: The DES group had the longest stenosis (20.51 ± 14.08 mm vs. 5.84 ± 12.43 and 6.57 ± 6.54 mm in NiTi and ST, respectively, day 30; P < .05), and higher granuloma formation on CT (50% of cases). The NiTi group showed the lowest grade of stenosis (2.86 ± 6.91% vs. 11.28 ± 13.98 and 15.54 ± 25.95% in DES and ST, respectively; P<.05). The AP study revealed that the ST group developed intense proliferative reactivity compared to the other groups. In the DES group, a destructive response was observed in 70% of the animals, while the NiTi was the least reactive stent. CT was more effective in detecting wall thickening (positive correlation of 68.9%; P < .001) than granuloma (not significant). Conclusions: The ST group developed granulomas and significant stenosis. NiTi was the least reactive stent, while DES caused significant lesions that may be related to drug dosage. This type of DES stent is therefore not recommended for the treatment of tracheobronchial stenosis
Subject(s)
Animals , Female , Rabbits , Drug-Eluting Stents/adverse effects , Drug-Eluting Stents , Drug-Eluting Stents/trends , Tracheal Stenosis/complications , Tracheal Stenosis/etiology , Tracheal Stenosis/prevention & control , Airway Obstruction/chemically induced , Airway Obstruction/complications , Airway Obstruction/diagnosis , Stents/adverse effects , Stents/classification , Stents/trends , Tracheal Stenosis/classificationABSTRACT
INTRODUCTION: The objective of this study was to assess tracheal reactivity after the deployment of different self-expandable metal stents (SEMS). MATERIAL AND METHODS: Forty female New Zealand rabbits were divided into four groups. Three groups received three different SEMS: steel (ST), nitinol (NiTi), or nitinol drug-eluting stent (DES); the fourth group was the control group (no stent). Stents were deployed percutaneously under fluoroscopic guidance. Animals were assessed by multi-slice, computed tomography (CT) scans, and tracheas were collected for anatomical pathology (AP) study. Data from CT and AP were statistically analyzed and correlated. RESULTS: The DES group had the longest stenosis (20.51±14.08mm vs. 5.84±12.43 and 6.57±6.54mm in NiTi and ST, respectively, day 30; P<.05), and higher granuloma formation on CT (50% of cases). The NiTi group showed the lowest grade of stenosis (2.86±6.91% vs. 11.28±13.98 and 15.54±25.95% in DES and ST, respectively; P<.05). The AP study revealed that the ST group developed intense proliferative reactivity compared to the other groups. In the DES group, a destructive response was observed in 70% of the animals, while the NiTi was the least reactive stent. CT was more effective in detecting wall thickening (positive correlation of 68.9%; P<.001) than granuloma (not significant). CONCLUSIONS: The ST group developed granulomas and significant stenosis. NiTi was the least reactive stent, while DES caused significant lesions that may be related to drug dosage. This type of DES stent is therefore not recommended for the treatment of tracheobronchial stenosis.
Subject(s)
Granuloma/etiology , Self Expandable Metallic Stents/adverse effects , Tracheal Diseases/etiology , Tracheal Stenosis/therapy , Alloys , Animals , Female , Fluoroscopy , Models, Animal , Multidetector Computed Tomography , Rabbits , SteelABSTRACT
The sandfly Phlebotomus perniciosus is the most widespread vector of Leishmania infantum in Spain. Laboratory colonisation represents the most feasible source of information on the biology of these insects, but in conducting any study, the density of individuals in the colony may drop to such an extent that it is sometimes difficult to recover the initial population levels. A new technique was tested for the recovery of sandfly eggs in three different colonies; the recovery rate was studied by comparing the standard method of mass rearing with this new method of colony management. The results demonstrate a mean increase of 18.4 percent in adult production, a growth in colony productivity that justifies the inclusion of this process in the routine maintenance of any colony of sandflies.
Subject(s)
Animals , Female , Male , Animals, Laboratory/growth & development , Insect Vectors/growth & development , Phlebotomus/growth & development , Leishmania infantum , Population Density , SpainABSTRACT
IntroducciónLa fibrinolisis está recomendada en los diferentes consensos para el tratamiento del embolismo pulmonar masivo hemodinámicamente inestable (EPmHI).Material y métodosEn un solo centro desde enero de 2001 hasta diciembre de 2009 se han tratado 111 pacientes (55 hombres y 56 mujeres) diagnosticados de EPmHI (presión arterial sistólica<90 mmHg) con al menos dos de los siguientes criterios: índice de Miller > 0, disfunción ventricular y necesidad de drogas vasoactivas. En todos los casos se realizó fibrinolisis local con uroquinasa y en la mayoría fragmentación con catéter pig-tail. Se implantó un filtro de vena cava inferior (VCI) en 94 pacientes como medida profiláctica.ResultadosEl éxito técnico fue del 100%. El índice de Miller mejoró de 0,7±0,12 pre-tratamiento a 0,09±0,16. La presión arterial pulmonar media pasó de 39,93±7,0 mmHg a 20,47±3,3 mmHg en el control de 30-90 días. A 94 pacientes se les implantó un filtro de VCI que se pudo retirar en el 79% de forma satisfactoria. Siete pacientes fallecieron: 3 en el curso de su neoplasia, 3 por insuficiencia cardíaca derecha a 1, 7 y 30 días y otro falleció de hemorragia cerebral en las primeras 24 horas. Hubo complicaciones en el 12,6% de los casos, de las que 4,5% fuer mayor.ConclusiónLa fibrinolisis local con fragmentación consigue la normalización rápida de la presión pulmonar y constituye un método seguro y eficaz para el tratamiento del EPmHI(AU)
IntroductionFibrinolysis is recommended in several consensus documents for the treatment of a haemodynamically unstable massive pulmonary embolism (HUMPE).Material and methodsA total of 111 patients were treated in a single centre from January 2001 to December 2009. They were 55 males and 56 females diagnosed with HUMPE (systolic arterial pressure>90 mmHg) with at least two of the following criteria: Miller index>0, ventricular dysfunction, and need of vasoactive drugs. Local fibrinolysis with urokinase was performed in all cases, and fragmentation with a pig-tail catheter in the majority of them. An inferior vena cava (IVC) filter was implanted in 94 patients as a prophylactic measure.ResultsTechnical success was 100%. The Miller index improved from 0.7±0.12, pre-treatment, to 0.09±0.16. The mean pulmonary arterial pressure fell from 39.93±7.0 mmHg to 20.47±3.3 mmHg in the 30-90 days review. Of the 94 patients with IVC filters implanted, 79% were withdrawn satisfactorily. Seven patients died: 3 due to their neoplasia, 3 due to right cardiac failure at 1, 7 and 30 days, and another died of a brain haemorrhage in the first 24hours. There were complications in 12.6% of the cases, of which 4.5% were major.ConclusionLocal fibrinolysis with fragmentation achieves a rapid return to normal of the pulmonary pressure and is a safe and effective method for the treatment of HUMPE(AU)
