Search Results
Results 251 - 300 of 547
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Isaaz K - - 1998
OBJECTIVES: We tested the value of transesophageal Doppler echocardiography (TEDE) for quantitating proximal left coronary artery (LCA) stenosis by using the continuity equation. BACKGROUND: The continuity equation applied to a stenosis states that the ratio of the time-velocity integral (TVI) of prestenotic to stenotic flow velocities is equal to the ...
Grech V - - 1998
The Maltese population constitutes an ideal location for epidemiological and historical studies dealing with congenital heart malformations. Pulmonary stenosis was studied retrospectively from 1943 to 1994. A sharp, significant decline in age at diagnosis was found, which predates the introduction of echocardiography. All defects are now diagnosed by echocardiography, which ...
Hunley Stephen O. - - 1998
We present the case of a 66-year-old woman presenting with pulmonary vein stenosis with a large descending thoracic aortic aneurysm. Pulmonary vein stenosis is a rare condition and can be caused by extrinsic compression, as well as by inflammatory diseases, congenital anomalies and related surgical repair, tuberculosis, and pulmonary veno-occlusive ...
Zbornikova V - - 1998
Different opinions exist about grading > 50% stenosis resulting from differences in angiographically estimated measurements and differences in weighing hemodynamic parameters at duplex scanning. The aim of this study was to reevaluate the correlation between duplex scanning measurements and angiographic findings in > 50% stenosis by using correlation coefficients instead ...
Kitazume H - - 1998
BACKGROUND: To examine the long-term outcome of coronary angioplasty, lesions that remained patent after 3 to 12 months were monitored angiographically at 3-year intervals. There were 252 lesions successfully dilated (from 83% +/- 13% preprocedural stenosis to 19% +/- 14% residual stenosis) between 1983 and 1986 that remained patent on ...
Stadius M L - - 1998
Eight consecutive patients with unstable angina underwent intravascular ultrasound imaging of the culprit artery with measurements recorded at the stenosis and at an adjacent reference site. In all patients, total artery cross-sectional area was smaller at the stenosis site than at the reference site, indicating that a structural change in ...
Sani A - - 1998
A method of treating tracheostomal stenosis post-laryngectomy is described. The carbon dioxide (CO2) laser is used to fashion and ablate two triangular areas lateral to the stenosed stoma to provide an immediate enlarged stoma for comfortable breathing. This simple procedure is done under local anaesthesia, is almost bloodless, safe and ...
Lester S J - - 1998
One of the challenges in clinical cardiology is to determine the optimal time of valve replacement surgery in patients with aortic stenosis. To meet this challenge, one requires an accurate knowledge of the natural history and rate of progression of the disease. This review will summarize the natural history of ...
Wise S W - - 1998
OBJECTIVE: This study assesses artifactual luminal distortion, or eccentricity, that affects measurement of stenosis on CT angiography performed with a variety of helical protocols. MATERIALS AND METHODS: A 32-vessel carotid artery phantom was built with five known grades of stenoses (25%, 50%, 75%, 88%, and 94%) and three lengths of ...
Changchien C R - - 1998
Rectal stenosis following low anterior resection is common. Several methods of treatment have been described. We introduce a simple method for the treatment of anastomotic stenosis using a conventional proctoscope and an electric knife with a Foley catheter as an anvil. Under direct vision, this technique can afford accurate and ...
DiSalle R S - - 1998
Midshunt stenosis and recurrent variceal bleeding occurred in 2 patients after transjugular intrahepatic portosystemic shunts (TIPS). Repeat angioplasty was performed in both cases but recurrent stenosis again led to hemorrhage. Expanded polytetrafluoroethylene (ePTFE) graft-covered stents were expanded in each of the TIPS at the midshunt, reducing the portosystemic gradient for ...
Thomas L - - 1998
Subaortic stenosis is rare in the middle-aged adult. Its association with tetralogy of Fallot is extremely rare. We report two middle-aged patients, presenting three decades after surgical repair of tetralogy of Fallot, with the rare association of subaortic stenosis. The clinical presentation in each patient mimicked residual pulmonary stenosis and ...
Al-Halees Z - - 1998
Use of autologous tissue in corrective cardiac operations offers many advantages including the potential for growth. We report a surgical technique using autologous pulmonary artery in the repair of supravalvar aortic stenosis in a 6-year-old child. At 30 months' follow-up, the pulmonary arterial tissue shows no evidence of calcification or ...
Aizawa H - - 1998
Coronary ostial stenosis in otherwise normal coronary vessels, is a rare complication of syphilitic aortitis, and most of the cases are found at autopsy. We report here a case in which bilateral coronary ostial stenosis and aortic regurgitation due to syphilitic aortitis was diagnosed; coronary artery bypass graft and aortic ...
O'Laughlin M P - - 1998
Stenosis of pulmonary arteries is one of the most challenging problems requiring treatment in the care of patients with congenital and acquired cardiopulmonary disease. Surgical approaches have been met with difficulty over the years, and may themselves lead to further distortion of the treated arteries. Balloon dilation first came into ...
Sharma J - - 1997
This report describes a rare case of moderate to severe valvular aortic stenosis in the setting of severe tricuspid stenosis, pulmonary atresia with intact interventricular septum and right ventricular dependent coronary circulation. We discuss the clinical, hemodynamic, echocardiographic and angiocardiographic findings on this rare case and comment on accompanied malformations, ...
van Ommen V G - - 1997
PURPOSE: To evaluate distal embolization while using the Hydrolyser (hydrodynamic thrombectomy catheter) with special attention to the severity of the stenosis and temporary distal or proximal flow obstruction. MATERIALS AND METHODS: The Hydrolyser procedure was assessed in plastic tubes (5-8 mm) with a 70% or 90% diameter stenosis with or ...
Porter T R - - 1997
OBJECTIVES: We sought to determine the effect of multivessel as opposed to single-vessel coronary artery stenosis on myocardial contrast defects observed with intermittent harmonic imaging and intravenous perfluorocarbon-exposed sonicated dextrose albumin contrast injection. BACKGROUND: Intermittent harmonic imaging has permitted the detection of myocardial perfusion abnormalities with an intravenous ultrasound contrast ...
Hirata N - - 1997
Patients with mild pulmonary stenosis after infancy rarely have symptoms or develop increasing obstruction. We experienced a 68-year-old woman with severe pulmonary valvar and infundibular stenosis (peak to peak pressure gradient = 80 mmHg). She had been pointed out heart disease at the age of six. Endocarditis at the age ...
al-Halees Z - - 1997
OBJECTIVE: To assess durability and viability of autologous aortic tissue used to augment severe branch pulmonary artery stenosis with a novice surgical technique. PATIENTS AND METHODS: Seven patients underwent corrective surgery for complex cyanotic congenital heart disease. Their age ranged from 3-6 years, and their weight 11-17.4 kg. All had ...
Gill E A - - 1997
Noninvasive cardiac imaging techniques now make it possible to determine the morphologic and hemodynamic status of patients with aortic stenosis, even in early asymptomatic stages of the disease. This is particularly important since the prognosis is generally poor once symptoms are apparent and since replacement of the aortic valve is ...
Dietz U - - 1997
AIMS: Excellent agreement between different 'second generation' systems for quantitative coronary arteriography (QCA) has been found in in vitro measurements. To verify the quality and stability of QCA when used in clinical practice, three QCA systems (AWOS, Cardio, and CMS) were used in a representative set of coronary artery lesions. ...
Downing J M - - 1997
High-grade stenosis can produce conditions in which the artery may collapse. A one-dimensional numerical model of a compliant stenosis was developed from the collapsible tube theory of Shapiro. The model extends an earlier model by including the effects of frictional losses and unsteadiness. The model was used to investigate the ...
Subahi Saad A. - - 1997
The role of transesophageal echocardiography (TEE) in diagnosis of disorders of the thoracic aorta is well established. In this report the TEE findings in an adult patient with supravalvular aortic stenosis are presented. This showed narrowing of the ascending aorta just above the sinuses, due to fibromuscular thickening, causing an ...
Post K - - 1997
OBJECTIVE: To compare the degree of vessel narrowing seen on selective and non-selective carotid artery catheter angiograms using criteria set by NASCET and ECST with the results obtained from corresponding surgical specimens. SUBJECTS: In 40 preoperative angiograms (20 non-selective, 20 selective) the 'distal' degree of internal carotid artery (ICA) stenosis ...
Tacke J - - 1997
RATIONALE AND OBJECTIVES: The authors evaluated the influence of a proximal arterial stenosis on the poststenotic doppler spectrum of a second, distal stenosis and determined duplex parameters, which permitted description of the severity of the distal stenosis. METHODS: Moderate (ie, 50%) and severe (ie, 90%) stenoses of the distal aorta ...
Sigfússon G - - 1997
OBJECTIVES: The purpose of this study was to examine the echocardiographic abnormalities of the left ventricular outflow tract associated with subaortic stenosis in children. BACKGROUND: Considerable evidence suggests that subaortic stenosis is an acquired and progressive lesion, but the etiology remains unknown. We have proposed a four-stage etiologic process for ...
Milo S - - 1997
For neonates with severe valvar stenosis, or valvar pulmonary atresia with an imperforate pulmonary valve, we present a simple but effective closed procedure using a specially designed valvectomy punch. Seven neonates, who were not suitable for any type of transcatheter procedure, were treated. There were two late deaths, neither directly ...
Rumberger J A - - 1997
OBJECTIVES: We sought to determine a range of cutpoints for coronary calcium scores measured by electron beam computed tomography (EBCT) in predicting the likely severity of associated angiographic coronary artery stenoses. BACKGROUND: EBCT can quantify coronary calcium and allow the estimation of atherosclerotic plaque burden, but use of the calcium ...
Migliavacca F - - 1997
The bidirectional cavopulmonary anastomosis is a surgical technique utilized to treat severe congenital malformations of the right part of the heart. It is obtained by anastomosing the superior vena cava to the superior aspect of the undivided right pulmonary artery. Transient simulations with a three-dimensional model of the bidirectional cavopulmonary ...
Blumberg F C - - 1997
We investigated whether multiplane transesophageal Doppler echocardiography using transgastral views allows determination of pressure gadients and valve areas in patients with aortic stenosis. This technique was feasible in 35 of 39 patients (90%), with highly significant correlations with results obtained from transthoracic Doppler echocardiography and cardiac catheterization, thus offering an ...
Henn W - - 1997
We present a family with an autosomal dominant phenotype characterized by pulmonary valve stenosis, craniofacial dysplasia with marked hypertelorism and, as a variable feature, progressive hydrocephalus. This phenotype is manifested in four patients from three subsequent generations of a family, with expression ranging from mild pulmonary stenosis combined with slight ...
Kuntz K M - - 1997
BACKGROUND AND PURPOSE: Published criteria for the determination of carotid stenosis have been widely applied by vascular laboratories. We compared two vascular laboratories and their duplex ultrasound (DU) machines in terms of their overall diagnostic performance and the optimal criteria to identify patients who have a 70% to 99% stenosis ...
Lee, Paul Man-Yiu
Coronary arterial stenosis causes impairment of cardiac function and is the major contributor of mortality in cardiovascular disease. The data to date suggest that coronary stenosis greater than 50% is considered significant. Consequently, stenotic conditions of less than 50% are usually disregarded by the medical profession. However, myocardial ischemia may ...
Hoskins P R - - 1997
Maximum velocity as measured from spectral Doppler is dependent on the angle theta between the bean and the direction of motion of blood. The Doppler shift is dependent on the velocity component in the direction of the ultrasound beam, hence theta cannot be determined accurately. These factors produce errors in ...
Anand R - - 1997
We report our experience with asymptomatic valvar aortic stenosis diagnosed during infancy. During the period between November 1, 1986 and October 31, 1992 a total of 13 infants were diagnosed with asymptomatic aortic stenosis, 5 of whom showed rapid progression over the first 2 years of life. Two of these ...
Reardon M - - 1996
Aortic stenosis is common in the elderly. Basal systolic murmurs are also common. We studied 512 patients over the age of 65 years to ascertain the prevalence of basal systolic murmurs and by using echocardiography on those with basal murmurs to determine the prevalence of significant aortic stenosis. 29% (148) ...
Fernández A L - - 1996
Diverticula of the left ventricle are rare and only a few cases have been documented in adults. They may be asymptomatic or may present with embolization, pain, endocarditis, or sudden death. We report the case of a 34-year-old woman who presented a cardiac arrest with ventricular fibrillation which required electrical ...
Yilmaz A T - - 1996
Two patients, aged 20 and 21 years, with supravalvular aortic stenosis and aneurysms of the coronary arteries are described. In supravalvular aortic stenosis, dilatation of the sinuses of Valsalva and multiple abnormalities of one or both coronary arteries are common. Aneurysm of coronary artery has not been well recognized as ...
Gottsauner-Wolf M - - 1996
Visual judgment of stenosis severity from cine-film or single-photon emission computed tomographic dipyridamole perfusion images was compared to assessment of stenosis severity as measured with digital quantitative coronary angiography. Thirty patients with angiographically verified single-vessel disease underwent dipyridamole thallium stress testing within 90 days of angiography. A percent diameter stenosis ...
Magnusson B - - 1996
Ileal conduit stenosis was diagnosed in 12 patients in the period 1981-1994. The time between urinary diversion and this diagnosis was 7-30 (mean 14) years. The clinical picture, i.e. colicky flank pain and/or fever, was produced by upper urinary tract obstruction. Intravenous urography, loopography and looposcopy were used in diagnosis. ...
Rychik Jack - - 1996
Aortic atresia or stenosis, when associated with hypoplasia of the left ventricle, presents the cardiac surgeon with a challenging reconstruction. Many preoperative and intraoperative decisions are now made on the basis of ultrasound data. Furthermore, echocardiography provides the most convenient way to time the stages of the reconstructive sequence and ...
Line P D - - 1996
OBJECTIVE: To investigate how site and severity of arterial stenosis, and distance between tourniquet and measuring probe influences the postocclusive hyperaemic response in limb skin recorded by laser Doppler. DESIGN: Open study. MATERIAL: Nine Norwegian Landrace pigs. INTERVENTION: Experimental stenoses in the abdominal aorta, the external iliac and femoral arteries. ...
Cohen A S - - 1996
A 35-year-old woman underwent reconstruction of her right pulmonary artery for treatment of acquired right pulmonary artery stenosis. The stenosis was secondary to tuberculosis causing both an extrinsic and an intrinsic obstructive component. After her reconstruction, the patient made an uneventful recovery, and perfusion to the right lung was subsequently ...
Sugita Y - - 1996
OBJECTIVE: To evaluate the efficacy of retrograde balloon dilatation for primary pelvi-ureteric junction (PUJ) stenosis (RBDP) in children. PATIENTS AND METHODS: Sixteen children (12 boys, four girls; mean age 29 months) with primary PUJ stenosis initially underwent RBDP. A double-pigtail catheter was left in the ureter for 6 weeks to ...
Nakanishi T - - 1996
Supravalvular aortic stenosis (SVAS) is rare in twins. We report monozygotic twins, both of whom had SVAS, coronary ostial stenosis, and peripheral pulmonary arterial stenosis, but no other phenotypic features of Williams syndrome. One of the twins died suddenly, but the SVAS and the right and left coronary ostial stenoses ...
Lynch M - - 1996
Acquired pulmonary artery stenosis is rare. There are two main types, firstly intrinsic disease of the pulmonary valve itself, such as carcinoid heart disease. Secondly, extrinsic compression of the pulmonary artery from a mediastinal structure. We report a case of acquired pulmonary supravalvular stenosis due to extrinsic compression by carcinoid ...
Wu J R - - 1996
We studied two brothers in a family with isolated congenital supravalvular aortic stenosis without Williams syndrome. Clinical, echocardiographic, hemodynamic and angiographic features of our cases were described. A severe long, narrowed supravalvular aortic stenosis involving the ascending aorta with proximal narrowing of the aortic branches and mild aortic insufficiency were ...
Toyota E - - 1996
Our aim was to evaluate the effects of intraaortic balloon pumping (IABP) on the blood velocity waveform in the absence or presence of coronary artery stenosis. Using anesthetized open-chest dogs, the septal arterial blood flow velocities were measured with a 20 MHz 80-channel ultrasound pulsed Doppler velocimeter in the absence ...
Pennell D J - - 1996
OBJECTIVE: The findings of magnetic resonance and x-ray angiography were compared for assessment of coronary artery stenosis in this validation study. BACKGROUND: Magnetic resonance angiography of the coronary arteries has recently been described, but there has been no comparison with x-ray angiography of localisation or assessment of important characteristics of ...
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