Pulsatile Flow
Mostrando 1-12 de 50 artigos, teses e dissertações.
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1. Postoperative Cognitive Dysfunction after Coronary Artery Bypass Grafting
Abstract Postoperative cognitive dysfunction is a common complication following cardiac surgery. The incidence of cognitive dysfunction is more pronounced in patients receiving a cardiac operation than in those undergoing a non-cardiac operation. Clinical observations demonstrated that pulsatile flow was superior to nonpulsatile flow, and membrane oxygenator
Braz. J. Cardiovasc. Surg.. Publicado em: 2019-02
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2. Subcutaneous Cavernous Hemangioma in the Nasal Dorsum: Report of Case Treated with Endoscopic Rhinoplasty
Introduction Hemangiomas are vascular malformations, with slow blood flow, that can occur in any part on the body. They are more common in women and, predominantly, are isolated lesions. The malformation does not spontaneously regress. Subcutaneous hemangioma is a rare variant with an aggressive growth pattern that sometimes recurs after excision. Object
Int. Arch. Otorhinolaryngol.. Publicado em: 2014-04
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3. Drag reduction by polyethylene glycol in the tail arterial bed of normotensive and hypertensive rats
This study was designed to evaluate the effect of drag reducer polymers (DRP) on arteries from normotensive (Wistar) and spontaneously hypertensive rats (SHR). Polyethylene glycol (PEG 4000 at 5000 ppm) was perfused in the tail arterial bed with (E+) and without endothelium (E-) from male, adult Wistar (N = 14) and SHR (N = 13) animals under basal conditions
Brazilian Journal of Medical and Biological Research. Publicado em: 2011-08
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4. Analysis of the hydrodynamic profile of different models of roller pump used in extracorporeal circulation / Analise do perfil hidrodinamico em diferentes modelos de bombas de roletes utilizadas em circulação extracorporea
Introduction: Among the equipment used in cardiopulmonary bypass, roller pumps have great importance, with models available from several manufacturers. The roller adjustment is an important factor in the rates of hemolysis and the hemolytic potential differs in adjustment. Researchers do not always address details on the profiles of the raceway accepting tha
Publicado em: 2009
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5. Redução de arrasto por adição de polímeros em escoamento pulsátil laminar e turbulento em leitos arteriais caudais de ratos normotensos e hipertensos e tubos rígidos. / Drag reduction by polymers additives in laminar and turbulent pulsatile flow in tail arterial bed from normotensive and hypertensive rats and rigid tubes.
Nesse trabalho, foi analisada a redução de arrasto, a partir da utilização de duas bancadas experimentais, onde uma delas está situada no laboratório de Mecânica dos Fluidos (EPUSP) e a outra, no laboratório de Fisiologia Vascular (ICB-USP). A redução de arrasto foi investigada a partir do uso dos seguintes polímeros: poliacrilamida 1822S e 1340S,
Publicado em: 2008
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6. Repercussões da ação vasoconstritora da ropivacaína sobre a amplitude de pulso ocular em anestesia peribulbar
JUSTIFICATIVA E OBJETIVO A anestesia peribulbar pode reduzir o fluxo sanguíneo ocular (FSO) por elevação da pressão intra-ocular (PIO) ou por efeito farmacológico da solução administrada. A ropivacaína é um anestésico local com propriedade vasoconstritora intrínseca e baixa cardiotoxicidade. É utilizada rotineiramente em anestesia peribulbar, mas
Publicado em: 2007
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7. "Estudo experimental da transmissão da pulsatilidade da endoprótese à parede do aneurisma da aorta após correção endoluminal" / Pulsatility transmission from endograft to aortic aneurysm wall after endovascular repair : an experimental study
Objetivo: Medir a pulsatilidade da parede do aneurisma de aorta humano antes e depois de sua correção endoluminal. Método: Cinco aneurismas foram submetidos à perfusão pulsátil antes e depois do implante de uma endoprótese. Resultado: o nível da coluna de água oscilou durante a pulsação com variações de 17, 16, 13, 7 e 25 cm antes da colocação
Publicado em: 2005
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8. A pulsatile flow model for in vitro quantitative evaluation of prosthetic valve regurgitation
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. In
Brazilian Journal of Medical and Biological Research. Publicado em: 2000-03
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9. Determinação do fluxo arterial com o auxilio da pneumopletismografia e da ultra-sonografia duplex : estudo experimental e em voluntarios
The evaluation of patients with arterial disease includes the determination of arterial flow in the lower limbs. In this study, we compared the usefulness of US-Duplex and plethysmography for assessing arterial blood flow and the possible causes of errar associated with these procedures. Methods: For experimental evaluation of the US-Duplex, we used a system
Publicado em: 1999
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10. Pulmonary blood supply in bidirectional cavopulmonary anastomosis with pulsatile pulmonary blood flow: quantitative analysis using radionuclide angiocardiography.
OBJECTIVE: To establish a non-invasive method for quantitative analysis of pulmonary perfusion in patients with bidirectional cavopulmonary anastomosis (BCPA) and sources of pulsatile blood flow. The method should quantify left to right lung flow ratio and relative contribution of BCPA and sources of pulsatile blood flow to perfusion of each lung. DESIGN: A
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11. A model to simulate the haemodynamic effects of right heart pulsatile flow after modified Fontan procedure.
The effect of pulsatile pulmonary flow after the modified Fontan procedure was examined in a model that simulated the right heart. An inlet overflow tank (preload), axial pulsatile pump, Wind-Kessel model (afterload), and an outlet overflow tank were connected in series. The standard conditions were flow 2.00 l/min with 12 mm Hg preload pressure, 3.0 Wood un
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12. Comparative clinical study of pulsatile and non-pulsatile perfusion in 350 consecutive patients.
Pulsatile perfusion has been shown to offer significant haemodynamic advantages over non-pulsatile perfusion in many experimental studies. Clinical acceptance of pulsatile perfusion during cardiac surgical procedures has, however, been hampered by the lack of technologically satisfactory pulsatile pump systems, and by inadequate clinical experience of routin