Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Prosthesis Coloring”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,351 records · Page 75Linked to original sources
PubMed2003

Contrast-enhanced ultrasound imaging for aortic stent-graft surveillance.

PURPOSE: To compare unenhanced and enhanced ultrasound imaging to computed tomographic angiography (CTA) or magnetic resonance angiography (MRA) for surveillance of aortic endografts. METHODS: Thirty consecutive patients (29 men; mean age 69 years, range 50-82) who underwent endovascular aortic aneurysm repair agreed to participate in a follow-up program. Patients underwent CTA (26/30) or MRA (4/30), plain abdominal radiography, and unenhanced and enhanced ultrasound examinations at 3, 12, and 24 months to evaluate aneurysm diameter, endoleaks, and graft patency. The accuracy of ultrasound was compared with CTA or MRA as the reference standards. RESULTS: Twenty-six patients reached the 24-month assessment (mean follow-up 30 months, range 6-60). All endoleaks detected by CTA or MRA were confirmed by enhanced ultrasound; the aneurysm diameter in these patients remained unchanged or increased. In patients without endoleaks on any imaging method, the sac diameter remained unchanged or decreased. Endoleaks disclosed by enhanced ultrasound alone, all type II, numbered 16 at 3 months, 6 at 12 months, and 3 at 24 months. In this group, the aneurysm diameter remained unchanged or increased. Enhanced ultrasound yielded 100% sensitivity in detecting endoleaks, but compared with CTA and MRA, all endoleaks detected by enhanced ultrasound alone were false positives (mean specificity 65%). Nevertheless, because changes in the postoperative aneurysm diameter were similar in patients with endoleaks detectable on CTA/MRA and on enhanced ultrasound ("true positives") and in those with endoleaks detectable only on enhanced ultrasound ("false positives"), some endoleaks were possibly "true positive" results. CONCLUSIONS: Enhanced ultrasound is a useful method in the long-term surveillance of endovascular aortic aneurysm repairs, possibly in association with CTA or MRA. Enhanced ultrasound also seems able to identify endoleaks missed by other imaging techniques, but this conclusion awaits further investigation.

Aged↗
PubMed2003

[Conservative treatment of erectile dysfunction].

The development of diagnostical and therapeutical methods of erectile dysfunction opened new possibilities for patients. In our time, andrologists are capable of treating most patients. The ones who cannot be helped are unable to lead sexual life due to physical reasons. The application of hormone examinations, color Doppler and Rigiscan exams help at establishing diagnoses. In the therapy, modern peroral pharmacotherapy is dominant, mainly phosphodiesterase inhibitors and central peroral pharmacon are applied. The means of getting the vasoactive drugs into the body have been extended (subcutan, transdermal, and drugs absorbable through mucosa). Psychotherapy is indispensable at some patients. The surgical solution (mainly prosthesis implantation) can be regarded critically, yet their presence among therapies is necessary. According to authors' opinion, the qualitative development of vasoactive drugs (efficacy extension and side-effect reduction) that can be simply and conveniently applied in the future.

Administration, Oral↗
PubMed1999

Algorithm for the diagnosis and treatment of endoleaks.

BACKGROUND: Endoluminal grafting of abdominal aortic aneurysms (AAA) has shown promising early results. However, endoleaks present a new and challenging obstacle to successful aneurysm exclusion. We report our experience with primary, persistent endoleaks and provide an algorithm for their diagnosis and management. METHODS: Over a 19-month period, 73 patients underwent endoluminal repair of their AAAs using a modular bifurcated endograft as part of a US FDA Investigational Device Exemption trial. Spiral computed tomography (CT) scanning was performed prior to discharge after repair to evaluate for complete aneurysm exclusion. If no endoleak was present on that initial CT scan, color-flow duplex scanning was performed at 1 month, with repeat CT scanning at 6 months and 1 year. If the initial CT scan revealed the presence of an endoleak, repeat CT scanning was performed at 2 weeks, 1 month, and 3 months, or until the endoleak resolved. Any patient with an endoleak that persisted beyond 3 months underwent angiographic evaluation to localize the source of the leak. RESULTS: At 1 month, 62 patients (85%) had successful aneurysm exclusion. The remaining 11 patients (15%) had primary endoleaks, 8 (11%) of which persisted beyond 3 months, prompting angiographic evaluation. In 2 patients the endoleak was related to a graft-graft or graft-arterial junction. One was from the endograft terminus in the common iliac artery and was successfully embolized, along with its outflow lumbar artery. The other required placement of an additional endograft component across a leaking graft-graft junction to successfully exclude the aneurysm. The remaining six endoleaks were due to collateral flow through the aneurysm sac. In 4 cases this was lumbar to lumbar flow fed by hypogastric artery collaterals to the inflow lumbar artery. In the remaining 2 patients the endoleak was found to be due to flow between a lumbar and inferior mesenteric artery. Resolution of the endoleak by coil embolization of the feeding hypogastric artery branch in 1 patient was unsuccessful due to rapid recruitment of another hypogastric branch. Two of the six collateral flow endoleaks have resolved spontaneously without treatment, while the remaining cases have been followed up without evidence of aneurysm expansion. CONCLUSION: Systematic postoperative surveillance facilitates proper diagnosis and treatment of endoleaks. This involves serial CT scans to detect the presence of endoleaks, followed by angiography to determine their etiology and guide treatment, if clinically indicated.

Algorithms↗
PubMed1992

Value of acceleration flow signals proximal to the leaking orifice in assessing the severity of prosthetic mitral valve regurgitation.

To test the value of acceleration flow signals proximal to the leaking orifice in assessing the severity of prosthetic mitral valve regurgitation, 39 consecutive patients undergoing left ventriculography were examined by Doppler color flow imaging. Acceleration flow signals proximal to the regurgitant orifice were detected in 27 of the 31 patients who had prosthetic mitral regurgitation by left ventriculography (sensitivity 87%). All four patients without acceleration flow signals had mild prosthetic mitral regurgitation by angiography. No acceleration flow signals were detected in any patient without prosthetic regurgitation by left ventriculography (specificity 100%). Individual values of the maximal area of acceleration flow signals obtained from three orthogonal planes in seven patients with mild prosthetic mitral regurgitation by angiography ranged from 0 to 17 mm2 (mean 4 +/- 6). In 8 patients with moderate prosthetic mitral regurgitation by angiography, the maximal area of acceleration flow signals ranged from 21 to 58 mm2 (mean 33 +/- 15), whereas the maximal area of acceleration flow signals in 16 patients with severe prosthetic regurgitation ranged from 20 to 173 mm2 (mean 102 +/- 41). The maximal area of the acceleration flow signals from three planes correlated well with the angiographic grade of prosthetic mitral regurgitation. There was a significant difference in the maximal area of acceleration flow signals between mild and moderate (p less than 0.001), moderate and severe (p less than 0.001) and mild and severe (p less than 0.001) prosthetic mitral regurgitation. Thus, measurement of acceleration flow signals by Doppler color flow imaging is useful in assessing the severity of prosthetic mitral regurgitation.

Bioprosthesis↗
PubMed1995

Fixed provisional restorations for extended prosthodontic treatment.

During extensive and extended prosthodontic treatment, there is need for a durable esthetic fixed provisional restoration that can be easily modified as treatment is completed and that is cost-effective. The needed strength of provisional restorations can be underestimated, and the management of complex treatment is then more difficult and the prosthetic results less predictable. Knowledge of the criteria for treatment restorations and the adequacies of their construction is essential for the prevention of catastrophic failures, patient management problems, and compromised results. Many times in complex prosthodontic treatment, changes are needed in esthetics, the plane of occlusion, incisal edge position, lip support, and type of occlusion, or the soft and/or hard tissues need to be altered or grafted surgically. In addition, after first- and second-stage implant surgery and extractions, there is a need for immediate tooth replacement with extended time between prosthodontic treatments. These prosthodontic changes and challenges can be addressed with reinforced acrylic provisional restorations that are adequately cemented and retained during the interim stage of healing and treatment. In addition, the provisional restoration should serve as a guide for the final restoration while esthetics and phonetics are evaluated for patient acceptance. This article describes the materials used with an indirect technique for fabrication of an extended-treatment acrylic provisional restoration that uses an internal cast metal support system for strength. This support system consists of metal bands or copings with extensions into edentulous areas and that have been opaqued to neutralize the metallic color. A matrix of vinyl polysiloxane made from the diagnostic wax-up simplifies construction of the acrylic, resulting in a strong, ridged, yet esthetic result.

Acrylic Resins↗
PubMed2002

Echocardiographic determinants of mitral early flow propagation velocity.

Transmitral color Doppler early diastolic flow propagation velocity (Vp) has been correlated with the left ventricular (LV) relaxation time constant tau in dilated cardiomyopathy and ischemic heart disease. The aim of this study was to investigate the independent influence of LV systolic function and geometry, and of LV relaxation, on Vp in an unselected outpatient population. We studied 30 normal subjects and 130 patients (hypertensive LV hypertrophy, aortic valve stenosis or prosthesis, hypertrophic cardiomyopathy, coronary artery disease, dilated cardiomyopathy, aortic or mitral valve regurgitation). In all, we noninvasively measured LV geometry, mass, systolic function, wall motion dyssynergy, and diastolic function (abnormal relaxation or restrictive LV Doppler filling patterns). The Vp was similar in normal subjects and in patients (51 +/- 14 vs 53 +/- 25 cm/s). In normal subjects, the determinants of Vp at multiple regression analysis were isovolumic relaxation time, 2-dimensional cardiac index, and mitral E-wave velocity-time integral. In all, the main determinants were LV ejection fraction, percent of segmental wall dyssynergy, and isovolumic relaxation time and age. The Vp was highest in hypertrophic (75 +/- 25 cm/s, p <0.05 vs normal subjects) and lowest in dilated (35 +/- 13 cm/s, p = NS) cardiomyopathy. During multivariate analysis of variance, percent of wall dyssynergy (but not diffuse LV hypokinesia) independently reduced Vp (p = 0.02). The latter was not influenced by the LV filling pattern. Thus, in an unselected clinical population, prolonged relaxation per se does not influence Vp if LV systolic dysfunction and/or wall dyssynergy is absent-the latter factors are important independent determinants of Vp, which is determined by multiple factors.

Adult↗
PubMedDate not supplied

[Doppler color transesophageal echocardiography. Report of the first 110 studies carried out at the Ignacio Chávez National Institute of Cardiology].

Transesophageal echocardiography allows views of the posterior structures of the heart. This approach provides additional and complementary information to the transthoracic study, it is also an alternative in those patients with technical limitations for optimal precordial imaging. This study analysis the first 110 cases studied with transesophageal echocardiography in the National Institute of Cardiology Ignacio Chávez. They correspond to patients with valvular heart disease, prosthesis, acute and chronic ischemic heart disease, dissecting aortic aneurysm, cardiomyopathies, thrombus, tumors and masses. As well as paediatric and adult with complex congenital heart disease. The advantages of the transesophageal technique compared with the precordial approach are described.

Adolescent↗
PubMed2003

A comparison of the retention of tooth-colored posts.

OBJECTIVE: The aim of this in vitro study was to compare the retention of five different esthetic post systems of similar dimensions in extracted teeth using titanium posts as controls. METHOD AND MATERIALS: Sixty recently extracted single-rooted, caries-free teeth were sectioned horizontally and mounted in acrylic resin. The samples were randomly allocated into six groups of 10 for post preparation. Post space preparation was carried out according to the individual manufacturer's instructions. All posts were bonded using Panavia F. A 4-mm hollow, metal sleeve was luted over the free end of each post prior to mounting in a universal testing machine, and the forces required to dislodge the posts using a cross-head speed of 5 mm/min were recorded. RESULTS: It was found that the parallel-sided Lightposts were significantly more retentive than all of the other posts. Parapost Fibrewhite posts were more retentive than tapered Lightposts and Snowposts. There was no significant difference between the retention of stainless steel Paraposts and any of the other groups. CONCLUSIONS: Serrated parallel-sided stainless steel posts were no more retentive than either parallel-sided or tapered tooth-colored posts in this study. When all groups were considered, post dimension appeared to influence retention, with parallel-sided posts being more retentive than tapered posts.

Ceramics↗
PubMed1995

Modified porcelain-fused-to-metal restorations and porcelain laminates for anterior aesthetics.

Since the late 1950s, porcelain-fused-to-metal (PFM) restorations have remained a standard modality for rehabilitation of anterior dentition. This article discusses recent modifications to improve aesthetics, using clinical cases to present the multifaceted potential of this type of restoration. Color and contour are discussed. The use of a combination of laminate veneers and PFM restorations is presented in cases where the crown restorations of the adjacent teeth are not necessary, but color and contour require enhancement to achieve an aesthetic result. The learning objective of this article is to review the utilization of the improved porcelain laminates and the modified PFM crowns.

Crowns↗
PubMed1996

[The midterm evolution in the percutaneous closure of ductus arteriosus with the Rashkind prosthesis].

Background percutaneous PDA occlusion has been proposed as a valid therapeutic alternative to surgical closure. Between April 1990 and July 1994, 44 patients underwent percutaneous PDA occlusion. Thirteen patients were less than 18 months old and weighed 8.7 +/- 3.2 Kg (Group I). Thirty-one patients, older than 18 months of age, had a mean weight of 36.8 +/- 20.6 Kg (Group II). Four patients in group I and two in group II had associated cardiac anomalies Residual shunt after percutaneous occlusion was studied by color Doppler. Fifty-one occluding devices were used. Forty-nine were implanted and there were two device embolizations. Twelve devices were implanted in group I. One device needed surgical removal from the right ventricle where it had embolized. In group II, 31 devices were implanted and one embolized to the descending aorta and was percutaneously removed through the femoral artery sheath. In two patients of group I and four of group II, a second device was implanted. The total occlusion rate immediately after implantation at 24 hours and at 6 months was 75%, 83% and 83% in group I and 64.5%, 77% and 84% in group II. After implantation of a second device the total occlusion rate without residual shunt reached 100% in group I (after 16 +/- 12 months follow-up) and 97% in group II (after 23 +/- 16 months of follow-up). We conclude that percutaneous ductal occlusion with a Rashkind device is a valid therapeutic alternative to surgical closure in all age groups.

Adolescent↗
PubMed2004

Endovascular management of iliac vein occlusive disease.

Iliac vein occlusive disease presents with either acute or chronic symptoms, both of which can be managed with endovascular techniques. This report summarizes our experience in a small cohort of patients undergoing percutaneous treatment of iliac vein occlusive disease. Six women and one man with occlusive lesions in the iliac veins are included in this report. All patients reported leg pain and swelling, involving the right leg in one and the left leg in six. Symptoms were acute in one patient and chronic in six. Two patients presented with a chronic stasis ulcer. All patients with chronic symptoms were treated with self-expanding stents deployed across the occlusive lesion. The patient with acute symptoms was treated successfully with thrombolysis, which uncovered a fixed stenosis that was then stented. Post-procedure follow-up with duplex scanning was used for vein patency. No significant complications occurred. All patients reported symptomatic improvement, with four having complete resolution. Duplex scanning showed all treated venous segments to be patent at a mean of 12 months. Recanalization of obstructed iliac vein segments can be performed successfully and leads to improvement in pain and edema in the affected limb. Midterm patency rates are excellent.

Adult↗
PubMed1995

Anastomotic pseudoaneurysm of the ventricle after homograft placement in children.

A pseudoaneurysm of the right ventricle was diagnosed postoperatively in 8 patients between 1986 and 1992. One pseudoaneurysm formed after placement of a Carpentier-Edwards conduit and the other seven arose after placement of a homograft between the right ventricle and the pulmonary artery. Both aortic (n = 3) and pulmonary (n = 4) homografts had been used. In 6 patients, the homografts had been augmented proximally with Dacron, Gore-Tex, or pericardium. Pseudoaneurysms originated between the augmentation patch and the homograft in 4 patients, between the homograft or conduit and the myocardium in 3 patients (1 patient with and 2 without an augmentation patch), and between the patch and the myocardium in 1 patient. The prior operations performed were placement of a palliative conduit for tetralogy of Fallot with pulmonary atresia (n = 5), repair of truncus arteriosus (n = 2), and repair of absent pulmonary valve syndrome (n = 1). Pseudoaneurysms were discovered from 5 weeks to 4 years after the operation. Symptoms were present in 3 patients; in the others, diagnosis was made during follow-up on the basis of routine imaging studies. Symptoms, when present, were due to compression of surrounding mediastinal structures. Pseudoaneurysms ranged in diameter from 1.0 to 5.0 cm. Echocardiography and color-flow mapping reliably identified the pseudoaneurysm in the 6 patients in whom it was performed. Characteristic features included a well-defined, narrow aneurysm neck leading to an extracardiac echo-free space. Color-flow mapping demonstrated to-and-fro flow through the neck of the aneurysm.(ABSTRACT TRUNCATED AT 250 WORDS)

Aneurysm, False↗
PubMed2006

Stent-graft repair of an aortic rupture caused by invasive hemangiopericytoma.

We describe a patient with a history of hemangiopericytoma, who had hemoptysis develop due to a pseudoaneurysm of the thoracic aorta from an intrathoracic metastasis. Stent-graft repair successfully excluded the aneurysm from the aorta. Transesophageal echocardiography showed to be an important guide for correct placement of the device.

Aneurysm, False↗
PubMed1995

[Evaluating the extracranial cerebral arteries with ultrasound angiography].

AIM: Ultrasound angiography is a new method of colour-coded vessel imaging. The present study aimed at giving further information on its clinical utility in neurosonology. METHOD: The extracranial arteries of 53 patients and 5 normal persons were investigated by ultrasound angiography in comparison with colour-coded duplex sonography. RESULTS: We found a sharper imaging of stenoses and plaques by ultrasound angiography compared with colour Doppler. The imaging of the vessels can be achieved more continuously, avoiding dropouts of the colour. Small vessels and branches can be detected more reality. CONCLUSION: Ultrasound angiography represents a valuable additional imaging technique to colour-coded duplex sonography, providing further information, especially with regard to the border of plaques and stenoses.

Blood Flow Velocity↗
PubMed2005

Impact of carbon coating on the restenosis rate after stenting of atherosclerotic renal artery stenosis.

PURPOSE: To investigate the impact of carbofilm coating and low-profile rapid exchange stent devices on the restenosis rate after stent-angioplasty of atherosclerotic renal artery stenosis (RAS). METHODS: During a 2-year period (7/2002-7/2004), 143 consecutive patients with 179 primary ostial atherosclerotic RAS>or=70% diameter stenosis were treated with stents selected at the discretion of the operator. Eighteen patients (32 lesions) treated with 9 different types of stents were excluded from the analysis, leaving 125 patients (69 men; mean age 67 years, range 42 to 90) with 147 lesions who received either a Radix carbofilm-coated stent in 78 (53%) lesions (68 [54%] patients) or a Palmaz Genesis bare stainless steel stent in 69 (47%) lesions (57 [46%] patients). The target vessel diameter ranged from 5 to 7 mm. RESULTS: Baseline characteristics were similar in both groups except the mean stent diameter, which was larger in the bare stent cohort (6.4+/-0.7 versus 5.9+/-0.5 mm, p<0.001). Primary success was 100% in both groups; the initial mean diameter stenosis was reduced from 79%+/-14% and 80%+/-14% in the coated versus bare stent groups to 3+/-5% and 2+/-6%, respectively. After a mean follow-up of 22+/-5 months, the restenosis rate was 6.4% for the coated stent and 5.8% for the bare stent (p=0.87). For the entire cohort, restenosis rates varied significantly (p<0.05) according to stent diameter: 19% (5/26) for 5 mm, 4% (3/81) for 6 mm, and 2.5% (1/40) for 7 mm. In a binary logistic regression analysis including carbofilm coating, stent diameter, gender, diabetes, smoking status, and body mass index, stent diameter was the only independent predictor of restenosis (odds ratio 0.12, 95% CI 0.03 to 0.48 [p=0.003] for a 1-mm increase in vessel diameter). CONCLUSIONS: Using modern low-profile stent devices, carbofilm coating does not significantly reduce the restenosis rate compared to a bare metal stent. With contemporary stent devices, the restenosis rate has been decreasing compared to earlier reports in the literature.

Adult↗
PubMed2001

Achieving high-level esthetics with CEREC.

This article describes the evolution of the CEREC CAD/CAM restorative system and its ability to create esthetic, durable ceramic- and resin-based restorations chairside. Included is discussion about specific techniques for color enhancement and modification to increase the esthetic result. The three machinable materials currently available for use with the CEREC system also are discussed.

Ceramics↗
PubMed1991

[A sinus of Valsalva aneurysm ruptured into the right atrium secondary to aortic endocarditis. The usefulness of transthoracic and transesophageal echocardiography].

We present a case of a sinus of Valsalva aneurysm ruptured into right atrium secondary to aortic endocarditis. Early surgical procedure was indicated bases on transthoracic echocardiography. This technique demonstrated a abscess image enlarged into the right atrium and color Doppler showed a turbulent flow from aortic valve to right atrium. Cardiac surgery was performed with transesophageal echocardiography monitoring. This technique allowed anatomical and functional aortic valve evaluation and the abscess location and extension. This case shows the value of transthoracic and transesophageal color Doppler echocardiography in the diagnosis and management of patients with complications secondary to infective endocarditis.

Adult↗
PubMed1996

[Truncal valvoplasty for post-operative truncal valve regurgitation of truncus arteriosus: a case report].

The surgical treatment for truncal valve regurgitation is still controversial in patients with truncus arteriosus. A two-year-old girl with complaints of low weight gain and tachypnea was referred for treatment of truncal valve regurgitation. She had undergone an emergency pulmonary artery banding for severe congestive heart failure due to truncus arteriosus-type I at six months of age. This anomaly had been corrected by Barbero-Marcial method at seven months of age. But the truncal valve regurgitation started appearing at sixteen months of age with the progression of the stenosis of the pulmonary artery orifice and the right ventricular outflow tract regurgitation. Echo cardiography and cineangiography revealed the truncal valve to be bicuspid, and the regurgitation severe, especially through the prolapsed left sided cusp. The truncal valve was repaired by commissural suspension method, and the right ventricular outflow tract reconstructed with patch angioplasty of the pulmonary artery orifice and Carpentier-Edwards pericardial Bioprosthesis (19 mm). The post-operative course was uneventful. One year after, truncal valve regurgitation is small by color Doppler study. We conclude that valvoplasty is to be considered as the first choice of treatment for truncal valve regurgitation.

Child, Preschool↗