Search Results
Results 251 - 300 of 564
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Yamada S - - 1999
Most nonmalignant upper tracheal stenoses are caused by prolonged endotracheal intubation or tracheostomy, and idiopathic stenosis is uncommon. A 43-year-old woman complained of increasing shortness of breath during exercise over a year prior to admission. She had no significant past medical history, including endotracheal intubation. Bronchoscopy and tracheal tomography revealed ...
Awan A N - - 1999
Platypnea-orthodeoxia is encountered in a variety of cardiac, pulmonary, and hepatic disorders. We report its occurrence in a 59-year-old man who had had combined external-beam and high dose-rate iridium brachytherapy for a stage I non-small-cell carcinoma of the right upper lobe 2 years earlier. The post-radiation course was complicated by ...
Susanto I - - 1999
A high-grade complex tracheal stenosis distal to a tracheostomy tube occurred in a patient with a chronic vegetative state. The stenosis was easily and rapidly dilated at bedside using commercially available percutaneous tracheostomy kit dilators. Following tracheal dilation, a larger tracheostomy tube was inserted, resulting in the splinting of the ...
Wright I A - - 1999
The aim of this study was to apply artificial neural networks (ANNs) to the problem of the diagnosis of aorto-iliac arterial disease on the basis of the profile of the common femoral artery (CFA) Doppler flow velocity waveform. The maximum frequency envelopes obtained from the CFA of 180 subjects were ...
Teragawa H - - 1999
BACKGROUND: Adenosine triphosphate stress thallium-201 single-photon emission computed tomography (ATP SPECT) is useful for diagnosis of coronary artery disease, but its usefulness for evaluating the severity of coronary artery stenosis has not been established. METHODS AND RESULTS: We performed region-of-interest analysis of short-axis images obtained by ATP SPECT in 31 ...
Beebe H G - - 1999
Management decisions regarding carotid artery disease are critically dependent on stenosis but have been made difficult because of conflicting methods used to determine such stenosis. The increasing use of duplex ultrasound scanning has conventionally depended on Doppler velocity measurement, an indirect method for calculating carotid stenosis. Recent technical advances have ...
Lim H K - - 1999
PURPOSE: To determine the diagnostic accuracy of Doppler ultrasonography (US) in the detection of high-grade stenosis or occlusion of the celiac artery (CA) and superior mesenteric artery (SMA) and validate the previously reported Doppler US criteria. MATERIALS AND METHODS: During a recent 36-month period, 82 patients were prospectively examined with ...
Abo M - - 1999
A 67-year-old man was intubated for one week and suffered from wheeze and dyspnoea three months after the extubation. Bronchoscopy revealed tracheal stenosis by a web, which subsequent biopsy showed to be granulation tissue. The stenosis was removed by laser therapy but the stenosis soon returned. As cardiac function was ...
Gielen H - - 1999
Doppler echocardiography allows accurate serial assessment of pulmonary valvar stenosis by measuring the velocity of the jet stream through the pulmonary valve. Between 1979 and 1997, we saw 174 patients with isolated pulmonary valvar stenosis. At admission their ages ranged from 9 days to 22.5 years. We measured the velocity ...
Kim Y M - - 1999
We investigated the catheterization and angiographic findings of 26 patients with Williams' syndrome to evaluate the natural course of supravalvar aortic stenosis and peripheral pulmonary arterial stenosis. The severity of the stenosis was correlated with age and body surface area in terms of the pulmonary arterial index, right ventricular systolic ...
Tentolouris K - - 1999
Seventy-two patients aged 2-65 years (mean 20.2) with fixed subaortic stenosis (FSS) are reported. All patients underwent echocardiography and angiography prior to surgical intervention. Sixty-four (89%) had discrete subaortic stenosis (DSS) and 8 (11%) tunnel type stenosis (TSS). Patients with DSS aged 2-65 years (mean 29) while patients with TSS ...
Altorjay A - - 1999
The main considerations in replacing the esophagus are to avoid postoperative necrosis of all or part of the graft, leakage or stenosis of the anastomoses, and complications related to acid-peptic or alkaline reflux. A 5-year-old boy, after two unsuccessful thoracic operations for atresia and then stenosis of the esophagus, underwent ...
Blaufox A D - - 1998
Patients with left ventricular hypoplasia and left-sided heart obstructive lesions other than critical aortic stenosis may be inappropriately subjected to single ventricular repair because their assessment is based on faulty qualitative evaluations or on quantitative methods developed for critical aortic stenosis. Patients with left ventricular hypoplasia and left-sided heart obstructions ...
Etchells E - - 1998
OBJECTIVE: To evaluate a bedside clinical prediction rule for detecting moderate or severe aortic stenosis. DESIGN: Cross-sectional study with independent comparison to a diagnostic reference standard, doppler echocardiography. SETTING: Urban university hospital. PARTICIPANTS: Consecutive hospital inpatients (n = 124) who had been referred for echocardiography. MEASUREMENTS AND MAIN RESULTS: Participants ...
Elhendy A - - 1998
OBJECTIVES: To compare the accuracy of dobutamine stress echocardiography (DSE) and simultaneous 99mTc sestamibi (MIBI) single-photon emission CT (SPECT) imaging for the diagnosis of coronary artery stenosis in women. PATIENTS: Seventy women with limited exercise capacity referred for evaluation of myocardial ischemia. METHODS: DSE (up to 40 microg/kg/min) was performed ...
Archie J P JP - - 1998
This study is an analysis of the outcome of a common method of management of the external carotid artery (ECA) during routine carotid endarterectomy (CEA). Between 1986 and 1997, 1069 primary CEAs were performed with a combination of proximal eversion technique and blind distal endarterectomy on the ECA. Of these, ...
Baumgart D - - 1998
BACKGROUND: Myocardial fractional flow reserve (FFR) is based on pressure measurements. We have now sought to establish a Doppler-based concept of relative flow velocity reserve (RFVR) for the functional assessment of stenosis severity in epicardial coronary arteries. A clear threshold value to discriminate the functional severity of a coronary stenosis ...
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 ...
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