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 667 records · Page 37Linked to original sources
PubMed1988

Noninvasive Doppler color flow mapping for detection of anomalous origin of the left coronary artery from the pulmonary artery and for evaluation of surgical repair.

Anomalous origin of the left coronary artery from the pulmonary artery is a rare but important cause of congestive heart failure in infancy and of sudden death at all ages. Diagnosis is often missed when based solely on physical examination and noninvasive methods. A 4 year old patient is presented in whom mitral regurgitation was noted by a referring physician and an anomalous left coronary artery was found by Doppler color flow mapping upon referral and verified at cardiac catheterization. Doppler color flow mapping was also used intraoperatively using a gas-sterilized transducer to further clarify the hemodynamics and assess the surgical result. After creation of an intrapulmonary artery tunnel from the ostium of the left coronary artery to the aorta, anterograde coronary artery flow and absence of a residual left to right pulmonary artery shunt were verified during surgery by Doppler flow mapping. Postoperatively, residual mitral regurgitation and patency of the left coronary artery graft have been followed up serially by Doppler flow mapping. Therefore, Doppler color flow mapping is useful in the diagnosis and intraoperative and postoperative management of this important and potentially life-threatening abnormality.

Blood Vessel Prosthesis↗
PubMed1998

Ultrasound evaluation of endovascular repair of abdominal aortic aneurysms.

UNLABELLED: Endovascular repair of an abdominal aortic aneurysm (AAA) offers a minimally invasive alternative to an open surgical procedure in selected patients. The purpose of this study was to examine the usefulness of ultrasonography for evaluating the results of endovascular repair. METHODS: We studied 17 patients who underwent endovascular repair. In 10 patients a bifurcated prosthesis was positioned below the renal arteries with the bifurcated branches in the iliac arteries. The other 7 patients had a nonbifurcated infrarenal prosthesis. RESULTS: In each patient the AAA and the entire prosthesis, including its bifurcated branches, were visualized. The mean AAA diameter was 5.0 +/- 0.6 cm. The mean prosthesis body diameter was 2.2 +/- 0.3 cm, and the diameters of the bifurcated limbs were 1.0 to 1.2 cm. Color Doppler studies revealed blood flow limited to the prosthetic lumen and its bifurcation in 16 patients; the space between the prosthesis and the AAA wall was clotted in these patients. In 1 patient a communication was seen between the prosthesis and the AAA lumen through a dehiscence in the distal attachment. CONCLUSION: Ultrasonography is a simple, noninvasive tool for the evaluation of the results of endovascular repair of AAA and can detect complications of this procedure.

Aged↗
PubMed1990

[Plastic facial prosthesis].

Patients, who present severe facial defects, become the most disturbing challenge of prosthodontia. In this cases, with extensive loose of substance, some times other therapies, are contraindicated. In this paper, we review the procedures to make facial prostheses.

Aged↗
PubMed2004

Transesophageal echocardiography-guided algorithm for stent-graft implantation in aortic dissection.

OBJECTIVE: Endovascular stent-graft placement is replacing traditional surgery in type B aortic dissection. Usually stent-graft implantation is performed under fluoroscopic and angiographic guidance, but this relatively new procedure is still burdened with some complications. We investigated the value of a developed algorithm based on transesophageal echocardiography (TEE) for guiding stent-graft implantation in type B aortic dissection. METHODS: Forty-two patients with type B aortic dissection (chronic in 28 patients with aneurysmal dilatation of the false lumen, and acute complicated in 14 patients) underwent endovascular stent-graft reconstruction of the descending thoracic aorta. TEE was always performed after angiography. TEE-induced variations of the procedure, based on the algorithm, were compared with initial angiography-based decisions. RESULTS: TEE was decisive for guidewire repositioning (not possible with fluoroscopy) from the false to the true lumen in 3 patients and for correct guidewire entrance in an elephant trunk prosthesis in another patient. After stent-graft implantation color Doppler TEE enabled detection of proximal peri-stent leaks in 13 patients, whereas only 6 (46%) of the 13 leaks were detectable at angiography (P = .008). Most leaks were subsequently eliminated with balloon dilation or further stent grafting. Pulsed Doppler TEE was also useful for differentiating true leaks (13 patients) from Dacron porosity (7 patients). A pulsed-Doppler velocity cutoff value of 50 cm/s enabled differentiation of Dacron porosity (characterized by slow blood flow) from true peri-stent leak (fast flow). After stent-graft implantation TEE demonstrated new intimal tears in the thoracic aorta in 7 patients, whereas only 2 of the 7 new tears were detectable at angiography (P = .024); in 6 of 7 patients the new distal tears were subsequently resolved with placement of additional stents, whereas in a patient with Marfan syndrome new proximal tears determined a type I endoleak, which could not be resolved. Overall, TEE furnished decisive information additional to angiography in determining successful procedural changes in 16 of 42 patients (38%). There were no in-hospital deaths, and pre-discharge spiral computed tomograms showed a good outcome of stent-graft implantation in 37 of 42 patients (88%), with 5 residual type I endoleaks, all previously detected with TEE but impossible to eliminate with either balloon molding or further stent implantation. All but 2 patients (95%) are currently alive at mean follow-up of 30 +/- 18 months. CONCLUSIONS: TEE algorithm is an easy and useful tool in the operating room to guide correct stent-graft positioning in type B aortic dissection.

Adult↗
PubMed1999

Sustained high pressure double balloon angioplasty of calcified conduits.

OBJECTIVE: To assess the efficacy of prolonged high pressure angioplasty for dilatation of calcified and stenotic cardiac conduits in children. DESIGN: A prospective study of consecutive patients presenting with calcified and stenotic conduits. SETTING: Two tertiary paediatric cardiology departments. METHODS: Sustained (up to five minutes), high pressure (up to 18 atmospheres), double balloon angioplasty was performed in six calcified and stenotic cardiac conduits (five consecutive patients, three male, two female, age 4 to 17 years). Four patients had right ventricle to pulmonary artery (RV-PA) conduits, and one had two venous conduits in a Fontan circulation. RESULTS: Marked reductions in right ventricle to pulmonary artery gradients, from a median (range) of 48 (40 to 62) mm Hg to 11 (5 to 16) mm Hg, and in right ventricle to femoral artery pressure ratios, from a median of 0.8 (0.72 to 0.86) to 0.4 (0.33 to 0.44), were achieved for all RV-PA conduits. All five patients had sustained clinical improvement at follow up (median follow up 12 months) and none has required reintervention or surgery. CONCLUSIONS: Prolonged high pressure double balloon angioplasty may have a role in prolonging the interval between conduit replacements in a subset of patients with complex heart defects.

Adolescent↗
PubMed1988

Transesophageal two-dimensional echocardiography and color Doppler flow velocity mapping in the evaluation of cardiac valve prostheses.

To determine the value of transesophageal ultrasound in the assessment of cardiac valve prostheses, 14 patients with clinically suspected mitral prosthesis malfunction were studied by transthoracic and transesophageal two-dimensional imaging as well as by color Doppler flow velocity mapping (color Doppler). Patients underwent left ventricular angiography (n = 13), surgery (n = 11), or both angiography and surgery (n = 10). Nine patients had only mitral valve replacement, four patients had both mitral and aortic valve replacement, and one patient had mitral, aortic, and tricuspid valve replacement. There were 16 biological and four mechanical prostheses. The degree of mitral regurgitation was graded by both transthoracic and transesophageal color Doppler according to the area of the regurgitant jet visualized and was compared with a three-point classification of mitral regurgitation by left ventricular angiography judged by observers blinded to the echocardiographic results. All transesophageal studies were performed without complication and were well tolerated. The pathological morphology of the mitral prosthesis was additionally or more clearly visualized by transesophageal two-dimensional imaging and subsequently proven at surgery in three patients with flail leaflets and one patient with a vegetation compared with images obtained by the transthoracic approach. Valvular regurgitation was graded by the transthoracic approach as absent in four patients, mild in two patients, moderate in five patients, and severe in only three patients. The transesophageal assessment showed absence of mitral regurgitation in two patients, moderate regurgitation in two patients, and severe regurgitation in 10 patients.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1988

A prosthesis to camouflage indented scars.

Traditional silicone prostheses have been found to be inflexible, heavy, and of poor color match when used on the limbs. Ten patients distressed by contour deformities on their limbs after the wide excision of malignancies or following trauma were fitted with a light-weight prosthesis whose special features include a flexible foam backing, an outer tinted skin, and finely feathered edges that draw the eye away from the margins of the defect. The prosthesis sticks dependably to the skin and is particularly effective when worn under stockings or tights. When reviewed, all patients were continuing to use the device. It is a useful alternative to surgical reconstruction in such patients.

Adult↗
PubMed1998

Acquired aortopulmonary fistula. A case report.

A 63-year-old male patient with no prior history of heart disease was admitted in acute heart failure with diagnosis of pulmonary thromboembolism. 2D-echocardiography and color-Doppler echocardiography showed a severe aortic stenosis associated with an acquired aorto-pulmonary fistula bridging the ascending aorta and the main pulmonary artery. The diagnosis was confirmed by aortography. The patient underwent replacement of the aortic valve with a bileaflet mechanical valve. The fistula was obliterated with a Dacron patch anchored on the edges of its aortic opening. He did well postoperatively and was discharged with no complaint.

Angiography↗
PubMed2006

[Strategic plan for reshaping and using fixed prosthesis].

Fixed prosthodontics is the art and science of restoring defective or damaged teeth and/or replacing missing teeth. The primary objective of a restoration is to recover functional occlusion. Additionally, patients, regardless of their age and sex, have needs related to esthetic restoration. To please patients, the dentist must deliver an esthetic restoration that blends with the patient's natural teeth. These are some of the needs related to "basic research" in fixed prosthodontics. Either ceramic materials or resin composites are used for indirect esthetic restoration. In general, tooth-colored materials require incremental thicknesses to ensure adequate color and sufficient mechanical properties. However, the thick form of a prosthesis contradicts the concept of "minimal intervention". Patients though require restorations that meet their esthetic needs without any significant loss of tooth structure. The strategy for the "new (advanced) research" in fixed prosthodontics should be based on the two concepts of esthetics and minimal intervention. Although these two factors appear inconsistent, patients unquestionably require both to be provided with high quality care that will include both solutions in the context of a well-organized and sequenced comprehensive treatment plan. Consequently, in response to the growing popularity of esthetic dentistry, we dentists should develop a new dentistry field, one that introduces relevant new technologies along with newly developed materials.

Dental Materials↗
PubMed1999

Pseudoaneurysm of the abdominal aorta diagnosed by color duplex Doppler sonography.

A pseudoaneurysm of the abdominal aorta is rare, accounting for only 1% of all abdominal aneurysms. More than 1 imaging method may be needed to demonstrate an abdominal aortic pseudoaneurysm. We report a case in which the presence of continuous bidirectional flow in the neck of a pseudoaneurysm on color duplex Doppler sonography confirmed the diagnosis.

Adolescent↗
PubMed1996

The orientation of the bi-leaflet CarboMedics valve in the mitral position determines left ventricular spatial flow patterns.

OBJECTIVES: In the mitral annulus bi-leaflet mechanical valves can be oriented in two ways: the anatomical orientation with the hinge line parallel to a line through the commissures of the native valve (90 degrees). The influence of this orientation on the left ventricular spatial flow pattern and valve leaflet opening was investigated in pigs. METHODS: In 9 pigs a CarboMedics mitral valve prosthesis was implanted in the ) degree position and in 9 pigs in the 90 degree orientation. Two dimensional echocardiographic and color Doppler recordings were performed before surgery, immediately after surgery and after 6 weeks. RESULTS: In the native valve the diastolic flow pattern was characterized by a central inflow and backflow away from the apex along the left ventricular wall. In the 0 degree orientation a diastolic flow pattern with an asymmetrical inflow was observed, resulting from a greater extension of the jet along the lateral wall compared to the jet along the interventricular septum. Mid-diastolic back-flow away from the left ventricular apex was directed towards the valve prosthesis. In the 2-dimensional echocardiographic recordings the opening angle of both prosthetic leaflets was different showing a larger opening angle of the posterior leaflet. In the 90 degree orientation a diastolic flow pattern with paradoxical flow directions was recorded, that could only be explained in a 3-dimensional way: one inflow jet along the anterior wall, one inflow jet along the posterior wall and back-flow away from the apex sandwiched in between the two inflow jets. In this orientation the 2-dimensional echocardiographic recordings showed symmetrical opening of the two leaflets of the prosthesis. CONCLUSIONS: The orientation of the CarboMedics bi-leaflet mechanical valve prosthesis in the mitral valve annulus determines the left ventricular spatial flow pattern. The flow pattern resulting from the 0 degree orientation, was associated with asymmetrical leaflet motion, while the 90 degree orientation flow pattern was associated with symmetrical leaflet motion. These findings may be of importance for prosthetic valve function as well as for left ventricular kinetics.

Animals↗
PubMed2001

Influence of transesophageal echocardiography on intraoperative decision making for toronto stentless prosthetic valve implantation.

BACKGROUND AND AIM OF THE STUDY: Intraoperative transesophageal echocardiography (TEE) is commonly used during aortic valve surgery. In aortic valve replacement (AVR), this permits measurement of the aortic annulus, study of the anatomy of aortic valve components, and prediction of prosthesis valve size. After cardiopulmonary bypass (CPB), echocardiography is valuable in checking prosthesis function. In this study, we evaluated the impact of intraoperative TEE on the decision-making process of aortic Toronto stentless prosthetic valve (TSPV) implantation. METHODS: Fifty-two consecutive patients undergoing elective AVR were collected prospectively. Multiplane TEE was performed before CPB to determine diameters of the aortic valve annulus and sinotubular junction. This was to evaluate the feasibility of TSPV implantation in the aortic position and to predict prosthesis size. Further TEE evaluation was carried out after CPB to assess prosthetic valve function. RESULTS: TEE allowed measurement of the aortic annulus and sinotubular junction, and enabled correct prediction of prosthesis size. Ultrasonic evaluation also revealed contraindications to TSPV implantation in five patients. In one case, color-Doppler examination led to immediate successful surgical correction of prosthetic incompetence. CONCLUSION: Intraoperative multiplane TEE examination is useful in the decision-making process in AVR with the TSPV by selecting patients suitable for the stentless valve, predicting prosthesis size, and checking prosthesis function.

Aged↗
PubMedDate not supplied

[Diagnosis of coronary artery dehiscence and pseudoaneurysm after modified Bentall operation by Doppler color flow imaging: a case report].

This 48-year-old man presented with anterior chest and back pain in 1981. He was treated with replacement of the ascending aorta and aortic valve under a diagnosis of dissection of the ascending aorta with severe aortic regurgitation. He underwent modified Bentall reoperation for the dilation of the aortic root in 1991. Postoperative two-dimensional echocardiography was performed because of sustained atrial flutter. An echo-free space was detected between the aorta graft and aorta wrapping on the short-axis view. Doppler color flow imaging revealed blood flow from the left coronary artery graft into the echo-free space. This leakage was suspected to be the cause of the echo-free space. Transesophageal echocardiography was performed to conform this hypothesis, which revealed blood flow from the left coronary artery graft into the echo-free space in systole and flow into the left coronary artery graft from the echo-free space in diastole.

Anastomosis, Surgical↗
PubMedDate not supplied

[Echocardiographic diagnosis of obstructive intermittent dysfunction of a mitral disc prosthetic valve].

Echocardiographic findings in six patients with obstructive intermittent dysfunction of mechanical disc prosthetic mitral valve (OIPD) are described. All with a clinical picture of gradual installation and progressive dyspnea of several weeks of evolution. TTE with Bd recordings were performed in all of them with "oriented" M mode from apical 4/C view. The findings were compared with a control group of 14 patients with normal prosthetic valves. In the group of OIDP, all patients displayed a variable delay in the opening of the prosthetic disc, registered as a "protodiastolic step" in M mode. In three patients, the dysfunction was due to a thrombus. In two, due to pannus. Three were operated. One with thrombolysis. In two, the treatment consisted of heparin and increased oral anticoagulation. None die during the acute handling of the intermittent dysfunction. Two patients died: one seven months later due to cardiac failure and the other a year later due to prosthetic rethrombosis. In patients with mechanical prosthetic valve in mitral valve position and progressive dyspnea, the presence of a variable delay in the opening of the prosthesis is diagnostic of OIDP and requires urgent handling with thrombolysis or surgery.

Adult↗
PubMed2002

Anterior key method for indexing orbital prostheses.

This article describes a predictable method for indexing the ocular portion of an orbital prosthesis. Because indexing is performed from the anterior aspect of the cast, damage is minimized, fewer modifications are required, and the mold can be preserved for repeated use.

Acrylic Resins↗
PubMed1997

Postoperative hemodynamics of two bileaflet heart valves in the aortic position.

BACKGROUND AND AIMS OF THE STUDY: In vivo hemodynamic assessment of bileaflet aortic valve prostheses using standardized echocardiography is still uncommon; hence, adequate comparison of valve types can rarely be made. We compared the postoperative hemodynamics of St. Jude Standard valves (SJS) with those of Sorin Bicarbon valves (BC) implanted in the aortic position, using pulsed, continuous and color Doppler echocardiography. METHODS: The examination was performed four months after aortic valve prosthesis implantation in 76 patients (39 SJS valves, 37 BC valves). Valve sizes varied from 19 mm to 25 mm. Maximal and mean instantaneous pressure gradients were measured by Doppler echocardiography. Effective valve orifice area (EOA) was calculated and prosthetic valve regurgitation was assessed by color Doppler flow imaging. RESULTS: At valve sizes of 21 mm, 23 mm and 25 mm, SJS valves had a significantly lower EOAs than BC valves (p < 0.05). However, for a given nominal size, BC valves are larger, i.e. they have a larger anatomic (AOA) and geometric orifice area (GOA) than SJS valves. Consequently, BC valves were implanted in patients with a larger left ventricular outflow tract (p < 0.05). When EOA is related to the corresponding AOA, BC valves still show a larger EOA than SJS valves (p < 0.05). Prosthetic valve regurgitation is low in both valve types. CONCLUSIONS: (a) Nominal valve size is not always a good basis for comparison of hemodynamic profiles between valve types. (b) Using the relationship between EOA and AOA, the hemodynamic profile of BC valves in the aortic position is shown to be superior to that of SJS valves.

Aged↗