Papers by Carlos E. Gadda
Journal of Fluid Mechanics, 1980
The response of the near field of a free, plane air jet (aspect ratio 44: 1) to a controlled, sin... more The response of the near field of a free, plane air jet (aspect ratio 44: 1) to a controlled, sinusoidal perturbation was investigated by hot-wire measurements. The experiments were carried out at an exit excitation amplitude of 1.4 yo for the Strouhal number range 0.15 < StH < 0-6 and the Reynolds-number range 8 x lo3 < Re, < 3.1 x lo4. The influence of the excitation, introduced with a loudspeaker attached to the jet settling chamber, on the mean and fluctuating velocity fields is much weaker than that in the circular jet. The amplitude and phase profiles of the fundamental, educed through phase-locked measurements, show that the induced symmetric mode remains symmetric as it travels downstream. The wave growth rate is much higher and the wavelength much smaller in the shear layer than on the centre-line of the jet. The wave fundamental attains its maximum amplitude a,t StH N 0.18 on the jet centre-line and at 8 t H 21 0.45 in the shear layer. The amplitude profiles of the fundamental in the shear layer agree quite well with the spatial stability theory of Michalke (1965b); however, the phase data do not agree well with the theoretical predictions. The growth rate and the disturbance wavenumber increase monotonically with the StH both in the shear layer and on the centre-line but tend to approach constant values a t higher 8 t H. The phase velocity data show that, in the lower Strouhal-number range, the plane jet acts as a non-dispersive waveguide.
Revista Argentina de Cardiología, 2016
Revista Argentina de Cardiología, 2016
(IC) is the most common clinical manifestation in patients with peripheral vascular disease (PVD)... more (IC) is the most common clinical manifestation in patients with peripheral vascular disease (PVD). Between 25-33% of PVD patients will present symptoms of IC; (1) however, major amputation rate in these patients will not be >3.3%. (2) The main purpose for the treatment of these patients is to improve quality of life and reduce complications. Traditionally, pharmacological therapy and supervised exercise have been the first-line treatment. Today, with the development of endovascular treatment, a new alternative arises, given the low morbidity and mortality rates and the positive short-and mid-term outcomes. The purpose of this study was to analyze the technical success, complications, and clinical outcomes in a group of patients with symptoms of IC undergoing endovascular treatment. A descriptive, retrospective analysis was performed on 90 patients in whom 115 limbs were consecutively treated between September 2010 and January 2015. Inclusion criteria for the analysis of these patients were vascular IC Rutherford grade I, II, and III. Of the 115 limbs treated, 19.2% were grade II, and 80.8% were grade III. Clinical follow-up was performed at 1, 3, 6, and 12 months, and annually through questioning and physical examination. Technical success was defined as residual stenosis <30% without flow-limiting dissection of the treated arterial segment. Complications were divided into major-requiring open invasive treatments-or minor-requiring conservative or percutaneous treatments. The course of symptoms was divided into four groups. Asymptomatic group: patients had no symptoms of IC; symptomatic improvement group: patients with reduced Rutherford classification by one or more degrees; no improvement group: patients without clinical changes; and increased-symptom group: patients with IC increased by one degree in the classification. The femoral, contralateral, or ipsilateral access was the elective approach. Retrograde approaches were used in 4 limbs (3.5%) due to failed recanalization. Primary nitinol self-expanding stent (nSES) followed by percutaneous transluminal angioplasty (PTA) was the technique of choice. Drug-eluting balloon angioplasty (DEB-PTA) was the treatment of choice for stenotic lesions, while occlusive lesions were approached with PTA with stent or DEB implantation, depending on the result. Table 1 shows the characteristics of the study population. Among the 115 limbs considered for treatment, this was performed in the aortoiliac region in 45 (39%) and in the femoropopliteal region in 70 (61%). Infrapatellar vessel PTA was also performed in 9 limbs (7.8%) (Table 2). Technical success was reached in 114 (99.1%) of the 115 limbs treated. One hundred percent technical success was obtained in TASC A-B lesions,
Argentine Journal of Cardiology, 2012
1. INTRODUCCION Este Consenso de expertos fue elaborado para establecer recomendaciones de manejo... more 1. INTRODUCCION Este Consenso de expertos fue elaborado para establecer recomendaciones de manejo durante las 6 primeras horas del accidente cerebrovascular isquemico (ACVI). Se realizo una revision sistematica de la bibliografia publicada en la base de datos de Medline desde enero de 1965 hasta junio de 2011. La informacion obtenida se clasifico utilizando las normativas del American Heart Association para establecer el nivel de evidencia (Apendice 1). En las situaciones en las cuales no hay estudios clinicos que fundamenten la indicacion, las recomendaciones se formularon como opinion de expertos tomando en cuenta las normas de buena practica clinica (BPC). La aplicabilidad de las recomendaciones formuladas se evaluaron conforme a la Guia para la Adaptacion de Guias de Practica Clinica del Instituto de Investigaciones Epidemiologicas de la Academia Nacional de Medicina de 2005, que toma un rango de 1 a 7 para establecer la aplicabilidad de acuerdo con los siguientes parametros: or...
Revista Argentina de Cardioangiología Intervencionista, 2014
Kommerell’s diverticulum is an enlargement at the origin of the subclavian artery, related to a c... more Kommerell’s diverticulum is an enlargement at the origin of the subclavian artery, related to a congenital malformation of the aortic arch. It may remain asymptomatic, or present itself as a fatal complication secondary to dissection or rupture. Surgical and endovascular treatment for this entity has been published. We present a patient in which Kommerell’s diverticulum with right aortic arch was diagnosed by chance and his treatment by subclavian embolization and thoracic endovascular repair.
Revista Argentina De Cardiologia, 2010
Journal of the Neurological Sciences, 1997
Revista Argentina de Cardiologíar, 2012
Revista Argentina de Cardiología, 2012
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Papers by Carlos E. Gadda