Search Results
Results 401 - 450 of 578
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Nakane K - - 1990
We investigated a connection between the results of noninvasive angioplasty for the blood access stenosis and its morphological features in 37 dialysis cases. In 3 cases presenting stenosis in the original artery, the area could not be dilated by noninvasive techniques. In 4 cases with stenosis in the arterialized vein ...
Giles L G - - 1990
Much attention has been paid to the causes of vertebral canal stenosis in humans but relatively little has been documented with regard to intervertebral canal (intervertebral "foramen," lateral spinal canal, nerve root canal) stenosis. As the dural sleeve ends at the outer opening of the intervertebral canal, a false "normal" ...
Caspi J - - 1990
A group of 37 patients (age range, 3 months to 29 years) who died after the modified Fontan procedure (within 2 months), representing 15% of the 245 patients undergoing this procedure from 1976 through 1988, was reviewed to determine the causes of death. The three morphological groups were 1) univentricular ...
Bourdillon P - - 1990
Percutaneous balloon valvuloplasty has been used for several years for the treatment of stenosis of all four cardiac valves. It has been particularly effective in pulmonary stenosis in children and in rheumatic mitral stenosis, especially in the younger age groups without severe calcification. After initial enthusiasm, results have not been ...
Subramanyan R - - 1990
Fifty consecutive patients with aortic stenosis were evaluated by continuous wave Doppler echocardiography for assessment of the transaortic gradient. The Doppler derived gradients were compared with the gradients measured at cardiac catheterisation. Excellent correlation was found between the Doppler and catheterisation findings for the maximum instantaneous gradient (r = 0.92) ...
Wren C - - 1990
Data from 35 patients with supravalvular aortic stenosis or pulmonary artery stenosis, or both, undergoing cardiac catheterization between 1973 and 1989 were analyzed retrospectively. Twenty-seven patients had supravalvular aortic stenosis: 11 required surgery after the first investigation and 8 (80%) of 10 others undergoing serial investigation showed an increase in ...
Kalbfleisch S J - - 1990
Measurement of coronary artery stenosis is an invaluable tool in the study of coronary artery disease. Clinical trials and even day-to-day decision making should ideally be based on accurate and reproducible quantitative methods. Quantitative coronary angiography (QCA) using digital angiographic techniques has been shown to fulfill these requirements. Yet many ...
Katritsis D - - 1990
Out of 45 angioplasties attempted by the same cardiologist for stenosis of the left circumflex artery at St. Thomas' Hospital in a one and a half year period, six were unsuccessful due to inability to cross the lesion. In four of these cases, the lesion was crossed with the guide ...
Judge K W - - 1990
Doppler echocardiography allows accurate noninvasive measurement of transaortic velocity and pressure gradient in patients with valvular aortic stenosis. Because pressure gradients vary with transaortic volume flow, calculation of aortic valve area with the continuity equation is essential for complete echocardiographic evaluation of adult patients. The physician and sonographer should be ...
Thorvinger B - - 1990
The anatomy of the coronary arteries was outlined angiographically in 2,190 adult patients in order to determine the proportion of left predominance. Of 253 patients with valvular aortic stenosis 14.3 per cent were found to have left predominance, while the frequency of left predominance in the rest of the patients ...
Talwar D - - 1990
Bilateral, idiopathic, essentially asymptomatic but hemodynamically significant stenosis or occlusion of the sigmoid sinuses is extremely rare. We report a child with the angiographic features of occlusion of the right sigmoid sinus and severe stenosis on the contralateral side, presenting with megalencephaly and a cranial bruit. Cranial computed tomographic scans ...
Yamashita H - - 1990
The relationship of blood pressure, blood flow and Doppler waveform to arterial stenosis was investigated in a canine model. The method of making a stenosis involved using slide calipers and the critical stenosis of the femoral artery was 75 per cent. Among the parameters from Doppler waveform; peak forward velocity, ...
Wilson J H - - 1989
We report a patient with moderate aortic stenosis who had two episodes of calcium embolus to the left popliteal artery within ten months. This case suggests that calcium emboli can be recurrent and that major calcium emboli should warrant consideration of valve replacement, even in patients with mild aortic stenosis.
Leichter D A - - 1989
Discrete subvalvular aortic stenosis is a progressive lesion. Most reported cases have had a measurable left ventricular-aortic gradient that progressed in severity. This report describes 35 patients in whom no significant left ventricular-aortic obstruction was noted at initial cardiac catheterization, but who later were shown to have significant subvalvular aortic ...
Giddins N G - - 1989
The haemodynamic findings from two serial cardiac catheterisations in ten patients with Williams's syndrome were reviewed. The median ages at study were one and nine years. Raised mean (SD) left ventricular peak systolic pressures associated with supravalvar aortic stenosis increased significantly with time from 121 (25) mm Hg to 153 ...
O'grady M R - - 1989
Congenital aortic stenosis usually affects the subvalvular region, and occurs mainly in Newfoundland, Golden Retriever, German Shepherd, and Boxer dogs. The disorder is inherited as a dominant trait with variable penetrance in Newfoundland dogs.The prevalence of subaortic stenosis-like heart murmurs in Golden Retriever dogs appears to be very much greater ...
Johnson E L - - 1989
The coronary Doppler catheter has been used primarily in the measurement of coronary vasodilator reserve, most often as the ratio of peak to resting velocity in response to an intracoronary dose of papaverine. We have developed a new method based on the continuity equation using a Doppler catheter for the ...
Fedele F A - - 1989
Differences in coronary flow reserve with anatomically similar coronary artery stenoses have been attributed to 1) nonstandard physiologic conditions, 2) inadequacies of measurements of coronary artery stenosis dimension and/or coronary blood flow, and 3) inadequate hyperemic stimulus. Our study tested the hypothesis that details of coronary artery stenosis geometry, which ...
Holinger L D - - 1989
Various malformations of the cricoid cartilage produce congenital subglottic stenosis. The elliptical cricoid cartilage first was demonstrated histopathologically in horizontal sections of six postmortem specimens and now has been identified clinically in ten patients. The clinical diagnosis of the elliptical cricoid cartilage, suggested by anteroposterior soft tissue neck films, is ...
Langman A W - - 1989
Most cases of posterior commissure stenosis today result from endotracheal intubation. The problem has been very difficult to repair. Posterior commissure stenosis has been treated by repeated dilations, which do not work, and reconstructive measures by means of laryngofissure to excise the scar followed by the placement of round stents ...
Mehta P M - - 1989
The purported association between aortic stenosis and gastrointestinal arteriovenous malformations (AVMs) has not been rigorously evaluated. The diagnosis of aortic stenosis in most the prior studies has been based on clinical examination. We therefore utilized two-dimensional and Doppler echocardiography to document the presence or absence of aortic stenosis in 29 ...
Ensing G J - - 1989
Nonsyndromic familial supravalvular aortic stenosis is an autosomal dominant disorder. However, for many reported families, systematic study of all family members with echocardiographic or hemodynamic techniques has not been performed and degree of penetrance has not been assessed. The supravalvular stenosis in these family members usually is not associated with ...
Chiarella F - - 1989
Supravalvular aortic stenosis (McKusick 18550) is a rare hereditary condition with autosomal dominant transmission. However, the available data have been limited to small family groups which do not allow the definition of the degree of penetrance of the disease. The present study describes a large family with a high frequency ...
Janatuinen M J - - 1989
The surgical management of congenital aortic stenosis in 33 patients (age 2-20, mean 11 years) is described. The stenosis was valvular in 19 cases, subvalvular in eight and supravalvular in six. The primary procedures in valvular stenosis were valvotomy (12 cases), valve replacement (6) and exploration (1). Subvalvular stenosis was ...
Jalovaara P - - 1989
Thirty-one patients with degenerative or combined degenerative and developmental lumbar spinal stenosis diagnosed by myelography and at subsequent surgery were thoroughly examined by computed tomography (CT) to reveal the completeness of the decompression and its correlation with the outcome. Complete elimination of the stenosis was achieved in 10 cases (32%) ...
Sawada H - - 1989
A 38-year-old man with severe canal stenosis at the level of the atlas is reported. The clinical manifestations were muscular weakness and wasting of the upper limbs and spastic paresis of the lower limbs, which all progressed slowly. The atlas was hypoplastic and its retrodental space was narrow. The spinal ...
Cios K J - - 1989
A knowledge-based system that combines subjective Bayesian methods with rules specified by cardiologists to diagnose coronary artery stenosis from postexercise myocardial perfusion scintigrams is discussed. This expert system was used to determine which of the three main coronary arteries had the dominant stenosis. The system also indicated when a patient ...
Katayama T - - 1988
A sixty-one-year-old woman developed acquired infundibular pulmonary stenosis eleven years after radiation therapy to the mediastinum. On catheterization, there was a 48 mmHg gradient between the right ventricle and the pulmonary artery. Postmortem examination revealed remarkable narrowing of infundibulum. Histologic examination strongly suggested that muscular hypertrophy of the right ventricular ...
Van Maercke P - - 1988
The clinical course of a 50-year-old woman with oral lichen ruber planus (Irp) and prolonged dysphagia is described. The swallowing problems of this patient were related to an inflammatory lesion of the middle third of the esophagus, leading to stenosis. Distal to this area, the esophagus was covered with mucosa ...
Westgren M - - 1988
We describe a 28-week-old fetus with severe non-immune hydrops. Intrauterine cord blood sampling revealed hypercalcaemia of 3.4 mmol/l (n = 2.6 +/- 0.1). Subsequently, a postmortem examination revealed supravalvular aortic and pulmonary artery stenosis together with extensive arterial calcification. The maternal calcium, 25-hydroxyvitamin D3, 1,25-dihydroxyvitamin D3, and parathyroid hormone levels ...
Todros T - - 1988
We describe a case of severe pulmonary stenosis with intact interventricular septum diagnosed during fetal life at 34 weeks gestational age. An echocardiographic examination had been performed on the same fetus at 20 weeks, when no cardiac anomalies were observed. It is concluded that this form of pulmonary stenosis might ...
Wu D J - - 1988
The distribution and progression of coronary arterial and aortic lesions were examined in 40 conventional Watanabe heritable hyperlipidemic (WHHL) rabbits. They were classified according to age into stage I (3-5 months old, 14 rabbits), stage II (6-12 months old; 12 rabbits) and stage III (14-28 months old; 14 rabbits). Fifteen ...
Selzer A - - 1988
A retrospective review of 397 patients with valvular aortic stenosis emphasized the changing pattern of this lesion. Compared with the classical criteria for diagnosis of aortic stenosis established a few decades ago, patients were considerably older, mostly showing the degenerative form of this lesion. Among abnormal findings, the most important ...
Nakamura M - - 1988
By the evaluation of the strain and stress distributions in the vicinity of a stenosis, it is suggested that the bending moment generated by the axial force acting on a stenosis is one of the causes of the post-stenotic dilatation. The conditions which enhance this bending moment are investigated and ...
Achiron R - - 1988
Endocardial fibroelastosis is characterized by a diffuse thickening of the left ventricular endocardium with or without other cardiac anomalies. This entity had been diagnosed prenatally previously (Bovicelli et al., 1984) at a gestational age of 36 weeks. A case of endocardial fibroelastosis due to aortic stenosis accompanied by pericardial effusion, ...
Zijlstra F - - 1988
The goal of this investigation was to establish which anatomical parameters of stenotic lesions correlate best with its functional severity. Therefore, thirty-eight patients with single vessel disease underwent coronary cineangiography and exercise/redistribution thallium-201 scintigraphy. Cross-sectional area at the site of obstruction (OA), percentage diameter stenosis (DS), the calculated pressuredrop over ...
Holen J - - 1987
Torricelli's equation expresses a simple relationship between fluid velocity and pressure gradient in orifice flow and is currently used in conjunction with noninvasive Doppler ultrasound to determine gradients in mitral stenosis, and aortic stenosis, as well as other cardiovascular orifices. In theory, however, the Torricelli equation overestimates the gradient in ...
Bical O - - 1987
Fetal lamb experimental models were employed for intrauterine creation and repair of pulmonary artery stenosis. The study group was composed of 51 fetal lambs including 29 models of pulmonary artery stenosis and 22 control lambs. Gestational age was 89 days at creation of pulmonary artery stenosis. Fourteen fetal lambs (Group ...
Aksüt S V - - 1987
Premature atherosclerosis with a particular predilection to the coronary arteries is a well-known complication of homozygous familial hypercholesterolemia. However, well documented involvement of the aortic root and valve with aortic stenosis has not been recognized frequently antemortem. Clinical, echocardiographic, hemodynamic and angiographic features of a case with valvular and supravalvular ...
Douglas P S - - 1987
M-mode echocardiographic measurement of left ventricular fractional shortening and meridional wall stress has been used extensively alone and in combination to describe left ventricular systolic function. To determine whether the improved dimensional information afforded by two-dimensional echocardiography might result in shortening and stress calculations yielding a different view of left ...
Grover G J - - 1987
Valvar aortic stenosis can result in myocardial underperfusion with or without coronary obstruction. The purpose of this study was to determine how hearts with valvar aortic stenosis without hypertrophy can maintain their oxygen supply/consumption balance with partial left anterior descending coronary artery (LAD) occlusion. Open-chested, anesthetized dogs (n = 9) ...
Lombard J T - - 1987
We retrospectively reviewed the clinical and hemodynamic findings in 397 patients with valvular aortic stenosis at their first hemodynamic evaluation. This series is considered representative of aortic stenosis because it is heavily weighted toward older patients (average age, 61.1 years) and severe aortic stenosis (87.3% of patients had aortic valve ...
Tulassay Z - - 1987
Of 921 endoscopic sphincterotomies (EST) performed by the authors, 110 (12%) were done for benign stenosis of papilla of Vater. Based on these data, they consider the possibilities of endoscopic diagnosis and treatment in the stenosis of papilla. One of the conditions for the diagnosis of papilla stenosis is the ...
Maher E R - - 1987
The incidence of aortic stenosis was studied in 174 consecutive patients aged less than 55 years at initiation of maintenance haemodialysis. Severe, calcific aortic stenosis developed in 6 patients a mean 9.7 years after starting haemodialysis (p = 0.0004 compared to population incidence). In 5 patients stenosis was due to ...
Hawkins D B - - 1987
Subglottic stenosis is more likely to develop secondary to endotracheal intubation if one or more trauma-related risk factors are involved. Ulcerations occur most often in the posterior-lateral cricoid ring. They vary in size and may involve the entire circumference of the subglottic area. The ulcerations heal with fibrous scarring which, ...
Wiesel J - - 1986
The absolute cross-sectional area of a coronary stenosis measured by quantitative coronary angiography correlates well with its hemodynamic significance. We evaluated a combined approach using edge detection applied to the normal segment and videodensitometry applied to the stenosis to determine the absolute cross-sectional area of the stenosis (videodensity method). The ...
Ackerman Z - - 1986
We treated three unrelated patients with hemophilia A and congenital pulmonary valve stenosis. In two patients, the occurrence of the cardiac malformation was sporadic and in one familial. The coexistence of hemophilia A and pulmonary valve stenosis might suggest a genetic linkage for both disorders. Review of the literature supports ...
Baker A R - - 1986
Pulsatility index (PI) is a commonly used method of objective assessment of the Doppler waveform. PI falls with increasing proximal stenosis and is raised by increasing peripheral resistance. Damping factor (DF) for an arterial segment is calculated by dividing the proximal by the distal PI. DF rises with increasing severity ...
Schellong H - - 1986
A total of 246 non-selected patients with oesophageal variceal haemorrhage were treated with the intravascular high-pressure injection technique. Approximately 200 ml of the sclerosant were injected in three sessions. Reliable destruction of the varices in the absence of necrosis/ulceration along the variceal "column" must be considered doubtful. Owing to misplaced ...
Wilms G E - - 1986
The ability of diagnostic intravenous digital subtraction angiography (IVDSA) to demonstrate the degree of renal artery stenosis was compared with that of intraarterial angiography in 45 patients with 92 arteries. Stenotic lesions on both IVDSA and intraarterial studies were classified as normal (0% stenosis), minor (less than 50%), low grade ...
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