scholarly journals Physiologic Timing for Objective Checking of Instantaneous Maximal Aortic Stenotic Area

2006 ◽  
Vol 48 (11) ◽  
pp. 2353
Author(s):  
Colette Veyrat
Keyword(s):  
Stenotic Area

Optical coherence tomography for elucidation of flow-diversion phenomena: The concept of endothelized mural thrombus behind reversible in-stent stenosis in flow-diverters

2021 ◽  
pp. 159101992110034
Author(s):  
Andre Monteiro ◽  
Demetrius K Lopes ◽  
Amin Aghaebrahim ◽  
Ricardo Hanel
Keyword(s):  
Optical Coherence Tomography ◽  
Intracranial Aneurysms ◽  
Flow Diversion ◽  
Optical Coherence ◽  
Recurrence Rates ◽  
Oct Imaging ◽  
Intravascular Optical Coherence Tomography ◽  
Stenotic Area ◽  
Flow Diverters ◽  
Stent Stenosis

Purpose Flow-diverters have revolutionized the endovascular treatment of intracranial aneurysms, offering a durable solution to aneurysms with high recurrence rates after conventional stent-assisted coiling. Events that occur after treatment with flow-diversion, such as in-stent stenosis (ISS) are not well understood and require further assessment. After assessing an animal model with Optical Coherence Tomography (OCT), we propose a concept that could explain the mechanism causing reversible ISS after treatment of intracranial aneurysms with flow-diverters. Methods Six Pipeline Flex embolization devices (PED-Flex), six PED with Shield technology (PED-Shield), and four Solitaire AB devices were implanted in the carotid arteries (two stents per vessel) of four pigs. Intravascular optical coherence tomography (OCT) and digital subtraction angiography (DSA) images obtained on day 21 were compared to histological specimens. Results A case of ISS in a PED-Flex device was assessed with OCT imaging. Neointima with asymmetrical topography completely covering the PED struts was observed. Histological preparations of the stenotic area demonstrated thrombus on the surface of device struts, covered by neointima. Conclusion This study provides a plausible concept for reversible ISS in flow-diverters. Based on an observation of a previous experiment, we propose that similar cases of ISS are related to thrombus presence underneath endothelization, but further experiments focused on this phenomenon are needed. Optical Coherence Tomography will be useful tool when available for clinical use.

Placement of endovascular stents for systemic venous obstruction after the Mustard operation

1994 ◽  
Vol 4 (4) ◽  
pp. 390-394 ◽  
Author(s):  
Jassim M. Abdulhamed ◽  
Saad Al Yousef ◽  
Mohamed A. Ali Khan ◽  
Martin O'Laughlin
Keyword(s):  
Balloon Catheter ◽  
Balloon Dilation ◽  
The Other ◽  
Complete Relief ◽  
Venous Obstruction ◽  
Endovascular Stents ◽  
The Third ◽  
Mustard Operation ◽  
First Case ◽  
Stenotic Area

AbstractThree patients aged five years, five years four months and 14 years with obstruction of the systemic venous baffle following the Mustard operation were treated with balloon dilation and implantation ofstents. Balloon dilation of the baffle obstruction was performed initially in the first two cases. In the third case, the obstruction was complete and was punctured with atranseptal needle via a 6 French transeptal sheath followed by a balloon dilation. in all three patients, a Palmaz stent (Johnson & Johnson, Summerville, New Jersey, USA) was loaded onto the balloon catheter and delivered into the stenotic area. There was complete relief of obstruction in allcases. The first case developed supraventricular tachycardia at the time ofcatheterization, the morning following implantation of the stent and thentwo weeks after that. There were no complications with catheterization and noshort-term side effects in the other cases. These cases illustrate the use of endovascular stents in the treatment of baffle obstruction.

STENOSIS OF THE PANCREATIC DUCTS IN FIBROCYSTIC DISEASE

PEDIATRICS ◽  
1962 ◽  
Vol 29 (4) ◽  
pp. 636-642
Author(s):  
William H. Snyder ◽  
Robert S. Cleland
Keyword(s):  
Vinyl Acetate ◽  
Common Duct ◽  
Pancreatic Ducts ◽  
Developmental Phase ◽  
Terminal Portion ◽  
Fibrocystic Disease ◽  
Additional Material ◽  
Section Technique ◽  
The Common ◽  
Stenotic Area

Casts of the pancreatic ducts utilizing the vinyl acetate technique showed stenosis in the terminal portion in two consecutive specimens from patients who died of cystic fibrosis. Because of the extreme shortness of the markedly constricted segment of the duct (less than 1 mm) in one case and the short, tiny, curled stenotic area that overlay the common duct in the other, both strictures might have been missed even if the serial section technique had been used. Vinyl acetate injection of the ducts of the pancreas offers a unique and potentially valuable technique for elucidation of basic pathologic changes in the pancreas in this disease. Additional material and further studies are indicated, but the occurrence of a constriction of the main duct of the pancreas is perhaps more frequent than heretofore realized. Whether the stenosis is a congenital malformation of the duct or the result of abnormal secretion of the gland during the developmental phase is not known.

Cutaneous microcirculation in patients with peripheral arterial occlusive disease: Comparison of capillary blood circulation in the nail fold of finger and toe

2020 ◽  
Vol 76 (2) ◽  
pp. 279-285
Author(s):  
C. Mrowietz ◽  
H. Sievers ◽  
G. Pindur ◽  
B. Hiebl ◽  
F. Jung
Keyword(s):  
Peripheral Arterial Occlusive Disease ◽  
Healthy Subjects ◽  
Maximum Velocity ◽  
Arterial Occlusive Disease ◽  
Occlusive Disease ◽  
Vascular Area ◽  
Peripheral Arterial ◽  
Stenotic Area ◽  
Nailfold Capillaries ◽  
Apparently Healthy

In patients with peripheral arterial occlusive disease (PAOD) a restricted circulation in cutaneous microvessels has been reported. In this study the velocity of erythrocytes (very) in finger nailfold capillaries - a vascular area without upstream macroangiopathy - and also in toe nailfold capillaries - a post-stenotic area –was investigated using capillary microscopy in apparently healthy subjects and patients with PAOD. Already in finger nailfold capillaries very of patients with PAOD under resting conditions was significantly lower than in capillaries of healthy subjects. This was also true for the circulation in toe capillaries. In addition, the erythrocyte velocities under resting conditions in the toe capillaries were significantly lower than in the finger capillaries. Similar results were found for the duration and the maximum velocity of postocclusive hyperemia. It is concluded that the resting blood flow in the skin microcirculation is impaired in PAOD patients, both under resting conditions and during postocclusive hyperemia in finger as well in toe nailfold capillaries.

Histopathology of Acquired Subglottic Stenosis

1981 ◽  
Vol 90 (4) ◽  
pp. 335-338 ◽  
Author(s):  
Gabriel F. Tucker ◽  
Leonard Newton ◽  
Robert J. Ruben
Keyword(s):  
Endotracheal Tube ◽  
Horizontal Plane ◽  
Cricoid Cartilage ◽  
Subglottic Stenosis ◽  
Total Occlusion ◽  
History Of ◽  
The Right ◽  
Stenotic Area

The history of a 2,900 g infant who had no stridor at birth and developed subglottic stenosis is presented in detail. The laryngeal lumen, which accepted a 3 mm endotracheal tube at one day of age, diminished to total occlusion at 15 months of age. There was an 8-day intubation and tracheotomy at nine months. At 19 months the patient expired from associated cardiac problems; the larynx was obtained at autopsy and was serially sectioned in the horizontal plane. A series (1mm-Tracer) of 12 sections through the stenotic area is presented. It demonstrates gross distortion of the cricoid cartilage with ossification extending into the right paraglottic larynx.

Acquired and Congenital Subglottic Stenosis in the Infant

1976 ◽  
Vol 85 (5) ◽  
pp. 573-581 ◽  
Author(s):  
James L. Parkin ◽  
Michael H. Stevens ◽  
August L. Jung
Keyword(s):  
Medical Center ◽  
Care Center ◽  
Subglottic Stenosis ◽  
University Of Utah ◽  
Newborn Intensive Care ◽  
Tracheostomy Tubes ◽  
The University ◽  
Stenotic Lesions ◽  
Stenotic Area ◽  
Overall Mortality

During the calendar year of 1974, the Intermountain Newborn Intensive Care Center at the University of Utah Medical Center had 603 admissions. A representative group of 293 charts were reviewed which indicated that 44% of these children were intubated from hours to weeks. The overall mortality rate for the 293 children was 29%. Eighteen of the 603 children were diagnosed as having subglottic stenosis. Fifteen of these children appeared to have acquired subglottic stenosis secondary to endotracheal intubation. Three children had congenital subglottic stenosis. Tracheostomy was necessary in the management of 15 patients. Ten of the 18 patients have survived and two of these patients still have tracheostomy tubes in place. The survival and thickness of the stenotic area are inversely proportional to the birth weight and the duration of intubation. Endoscopic excision, dilatation and stenting were techniques utilized in the treatment of these stenotic lesions. The extubation technique utilized is described. The factors involved in the production of acquired subglottic stenosis are presented along with suggestions to decrease the incidence of this problem in the intubated child.

scholarly journals Aortic valve stenotic area calculation from phase contrast cardiovascular magnetic resonance: the importance of short echo time

2009 ◽  
Vol 11 (1) ◽  
pp. 49 ◽  
Author(s):  
Kieran R O'Brien ◽  
Ruvin S Gabriel ◽  
Andreas Greiser ◽  
Brett R Cowan ◽  
Alistair A Young ◽  
...  
Keyword(s):  
Cardiovascular Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aortic Valve ◽  
Phase Contrast ◽  
Echo Time ◽  
Short Echo Time ◽  
Stenotic Area
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