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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 7
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A pulsatile flow model for in vitro quantitative evaluation of prosthetic valve regurgitation BJMBR
Giuliatti,S.; Gallo Jr.,L.; Almeida-Filho,O.C.; Schmidt,A.; Marin-Neto,J.A.; Pelá,C.A.; Maciel,B.C..
A pulsatile pressure-flow model was developed for in vitro quantitative color Doppler flow mapping studies of valvular regurgitation. The flow through the system was generated by a piston which was driven by stepper motors controlled by a computer. The piston was connected to acrylic chambers designed to simulate "ventricular" and "atrial" heart chambers. Inside the "ventricular" chamber, a prosthetic heart valve was placed at the inflow connection with the "atrial" chamber while another prosthetic valve was positioned at the outflow connection with flexible tubes, elastic balloons and a reservoir arranged to mimic the peripheral circulation. The flow model was filled with a 0.25% corn starch/water suspension to improve Doppler imaging. A continuous flow...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Flow model; Echocardiography; Valvular regurgitation.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000300013
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Automated grading of left ventricular segmental wall motion by an artificial neural network using color kinesis images BJMBR
Murta Jr.,L.O.; Ruiz,E.E.S.; Pazin-Filho,A.; Schmidt,A.; Almeida-Filho,O.C.; Simões,M.V.; Marin-Neto,J.A.; Maciel,B.C..
The present study describes an auxiliary tool in the diagnosis of left ventricular (LV) segmental wall motion (WM) abnormalities based on color-coded echocardiographic WM images. An artificial neural network (ANN) was developed and validated for grading LV segmental WM using data from color kinesis (CK) images, a technique developed to display the timing and magnitude of global and regional WM in real time. We evaluated 21 normal subjects and 20 patients with LVWM abnormalities revealed by two-dimensional echocardiography. CK images were obtained in two sets of viewing planes. A method was developed to analyze CK images, providing quantitation of fractional area change in each of the 16 LV segments. Two experienced observers analyzed LVWM from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artificial neural network; Color kinesis images; Left ventricular function.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000100001
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Can course format influence the performance of students in an advanced cardiac life support (ACLS) program? BJMBR
Garrido,F.D.; Romano,M.M.D.; Schmidt,A.; Pazin-Filho,A..
Advanced cardiac life support (ACLS) is a problem-based course that employs simulation techniques to teach the standard management techniques of cardiovascular emergencies. Its structure is periodically revised according to new versions of the American Heart Association guidelines. Since it was introduced in Brazil in 1996, the ACLS has been through two conceptual and structural changes. Detailed documented reports on the effect of these changes on student performance are limited. The objective of the present study was to evaluate the effect of conceptual and structural changes of the course on student ACLS performance at a Brazilian training center. This was a retrospective study of 3266 students divided into two groups according to the teaching model:...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Advanced cardiac life support; Cardiac arrest; Simulation.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000100004
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Head-to-head comparison of dipyridamole, dobutamine and pacing stress echocardiography for the detection of myocardial ischemia in an animal model of coronary artery stenosis BJMBR
Schmidt,A.; de Almeida-Filho,O.C.; Ayres-Neto,E.M.; Carneiro,J.J.; Marin-Neto,J.A.; Maciel,B.C..
To compare the sensitivity of dipyridamole, dobutamine and pacing stress echocardiography for the detection of myocardial ischemia we produced a physiologically significant stenosis in the left circumflex artery of 14 open-chest dogs (range: 50 to 89% reduction in luminal diameter). In each study, dobutamine (5 to 40 µg kg-1 min-1 in 3-min stages) and pacing (20 bpm increments, each 2 min, up to 260 bpm) were performed randomly, and then followed by dipyridamole (up to 0.84 mg/kg over 10 min). The positivity of stress echocardiography tests was quantitatively determined by a significant (P<0.05) reduction of or failure to increase absolute and percent systolic wall thickening in the stenotic artery supplied wall, as compared to the opposite wall (areas...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stress echocardiography; Pacing; Dobutamine; Dipyridamole; Animal model.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000700010
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Minor segmental wall motion abnormalities detected in patients with Chagas' disease have adverse prognostic implications BJMBR
Pazin-Filho,A.; Romano,M.M.D.; Almeida-Filho,O.C.; Furuta,M.S.; Viviani,L.F.; Schmidt,A.; Marin-Neto,J.A.; Maciel,B.C..
Recent data from our laboratory have shown that patients with the indeterminate form of Chagas' disease can have impairment of left ventricular contractility, as evaluated by the slope of the left ventricle end-systolic pressure-dimension relationship. We also showed that Chagas' disease patients with minimal baseline wall motion abnormalities detected by two-dimensional echocardiography have more intense contractility impairment when compared to patients with the indeterminate form of the disease without this abnormality. The prognostic implications of these findings have not been established. We evaluated 59 patients (37-76 years, mean = 55 years) with different clinical forms of Chagas' disease, who had normal left ventricular global systolic function...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Echocardiography; Chagas' disease; Left ventricular function; Indeterminate form of Chagas' disease.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000400008
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Organic acids in diets of weaned piglets: performance, digestibility and economical viability Arq. Bras. Med. Vet. Zootec.
Boas,A.D.C.V.; Budiño,F.E.L.; T. Neto,M.A.; Schmidt,A.; Dadalt,J.C.; Monferdini,R.P.; Sitanaka,N.Y.; Moraes,J.E.; Pizzolante,C.C..
ABSTRACT Organic acids are used as feed additives to promote growth of weaned piglets since they prevent the occurrence of diarrhea. Thus, performance and digestibility assays were conducted and economic viability of diets was evaluated. In the performance assays, 64 hybrid piglets weaned with a mean weight of 5.87±0.31kg were divided in a randomized block design consisting of 4 treatments, 8 repetitions and 2 piglets per experimental unit (1 castrated male and 1 female). In the digestibility assay, 24 castrated male hybrid piglets with a mean weight of 8.21±0.79kg were individually assigned to 4 treatments and 6 repetitions. The treatments in the two assays were as follows: control, basal diet without addition of an acidifier; blend: inclusion of 0.5% of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acidifiers; Additives; Digestibility; Performance; Pigs.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000401015
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Use of the Wasserman equation in optimization of the duration of the power ramp in a cardiopulmonary exercise test: a study of Brazilian men BJMBR
Costa,D. C.; Santi,G. L. de; Crescêncio,J. C.; Seabra,L. P.; Carvalho,E. E. V.; Papa,V.; Marques,F.; Gallo Junior,L.; Schmidt,A..
This study aimed to analyze the agreement between measurements of unloaded oxygen uptake and peak oxygen uptake based on equations proposed by Wasserman and on real measurements directly obtained with the ergospirometry system. We performed an incremental cardiopulmonary exercise test (CPET), which was applied to two groups of sedentary male subjects: one apparently healthy group (HG, n=12) and the other had stable coronary artery disease (n=16). The mean age in the HG was 47±4 years and that in the coronary artery disease group (CG) was 57±8 years. Both groups performed CPET on a cycle ergometer with a ramp-type protocol at an intensity that was calculated according to the Wasserman equation. In the HG, there was no significant difference between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Wasserman equation; Cardiopulmonary exercise test; Coronary artery disease; Cardiovascular diagnostic techniques.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015001201136
Registros recuperados: 7
Primeira ... 1 ... Última
 

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