Laser polarimetry imaging in diagnostics of morphological structure of the heart valve tendinous cords of newborns

2018 ◽  
Author(s):  
Sergey B. Yermolenko ◽  
Tetyana Semeniuk ◽  
Yulia Yu. Malyk ◽  
Natalija Penteleichuk ◽  
Olexander Tsyhykalo
Keyword(s):  
Heart Valve ◽  
Morphological Structure ◽  
Laser Polarimetry

High-resolution topographic SEM and radiation damage: The rationale for using low beam voltage

1992 ◽  
Vol 50 (2) ◽  
pp. 1278-1279
Author(s):  
James Pawley ◽  
David Joy
Keyword(s):  
High Resolution ◽  
Imaging Techniques ◽  
Morphological Structure ◽  
Radiation Sensitivity ◽  
Beam Specimen ◽  
Measured Signal ◽  
Practical Consideration ◽  
Interaction Volume ◽  
Impact Area ◽  
Signal Contrast

The scanning electron microscope (SEM) builds up an image by sampling contiguous sub-volumes near the surface of the specimen. A fine electron beam selectively excites each sub-volume and then the intensity of some resulting signal is measured and then plotted as a corresponding intensity in an image. The spatial resolution of such an image is limited by at least three factors. Two of these determine the size of the interaction volume: the size of the electron probe and the extent to which detectable signal is excited from locations remote from the beam impact area. A third limitation emerges from the fact that the probing beam is composed of a number of discrete particles and therefore that the accuracy with which any detectable signal can be measured is limited by Poisson statistics applied to this number (or to the number of events actually detected if this is smaller). As in all imaging techniques, the limiting signal contrast required to recognize a morphological structure is constrained by this statistical consideration. The only way to overcome this limit is to increase either the contrast of the measured signal or the number of beam/specimen interactions detected. Unfortunately, these interactions deposit ionizing radiation that may damage the very structure under investigation. As a result, any practical consideration of the high resolution performance of the SEM must consider not only the size of the interaction volume but also the contrast available from the signal producing the image and the radiation sensitivity of the specimen.

Choosing A Prosthetic Heart Valve

1991 ◽  
Vol 9 (2) ◽  
pp. 329-338 ◽  
Author(s):  
Jorge A. Wernly ◽  
Michael H. Crawford
Keyword(s):  
Heart Valve ◽  
Prosthetic Heart Valve

Impact of protein coating strategies on the re-endothelialization of biological heart valve scaffolds

2009 ◽  
Vol 56 (S 01) ◽  
Author(s):  
P Akhyari ◽  
H Ziegler ◽  
P Mambou ◽  
M Barth ◽  
S Hoffmann ◽  
...  
Keyword(s):  
Heart Valve ◽  
Protein Coating

Biological heart valve prosthesis in patients requiring chronic dialysis

2009 ◽  
Vol 56 (S 01) ◽  
Author(s):  
A Böning ◽  
S Haberer ◽  
UP Rosendahl ◽  
I Florath ◽  
JC Ennker
Keyword(s):  
Heart Valve ◽  
Chronic Dialysis ◽  
Heart Valve Prosthesis ◽  
Valve Prosthesis

Transcatheter aortic heart valve (THV) implantation of Edwards Sapien™ bioprothesis – using a mobile x-ray-system or a hybrid-OR?

2010 ◽  
Vol 58 (S 01) ◽  
Author(s):  
H Schröfel ◽  
G Schymik ◽  
A Würth ◽  
V Elsner ◽  
BD Gonska ◽  
...  
Keyword(s):  
Heart Valve ◽  
X Ray ◽  
Aortic Heart Valve ◽  
Edwards Sapien

A Comparison of a Moderate with Moderate-high Intensity Oral Anticoagulant Treatment in Patients with Mechanical Heart Valve Prostheses

1997 ◽  
Vol 77 (05) ◽  
pp. 0839-0844 ◽  
Author(s):  
Vittorio Pengo ◽  
Fabio Barbero ◽  
Alberto Banzato ◽  
Elisabetta Garelli ◽  
Franco Noventa ◽  
...  
Keyword(s):  
Heart Valve ◽  
High Intensity ◽  
Oral Anticoagulant ◽  
Oral Anticoagulants ◽  
Mechanical Heart Valve ◽  
Moderate Intensity ◽  
Minor Bleeding ◽  
Anticoagulant Treatment ◽  
Oral Anticoagulant Treatment ◽  
Valve Prostheses

SummaryBackground. The long-term administration of oral anticoagulants to patients with mechanical heart valve prostheses is generally accepted. However, the appropriate intensity of oral anticoagulant treatment in these patients is still controversial.Methods and Results. From March 1991 to March 1994, patients referred to the Padova Thrombosis Center who had undergone mechanical heart valve substitution at least 6 months earlier were randomly assigned to receive oral anticoagulants at moderate intensity (target INR = 3) or moderate-high intensity (target INR = 4). Principal end points were major bleeding, thromboembolism and vascular death. Minor bleeding was a secondary end-point.A total of 104 patients were assigned to the target 3 group and 101 to the target 4 group; they were followed for from 1.5 years to up 4.5 years (mean, 3 years). Principal end-points occurred in 13 patients in the target 3 group (4 per 100 patient-years) and in 20 patients in the target 4 group (6.9 per 100 patient-years). Major hemorrhagic events occurred in 15 patients, 4 in the target 3 group (1.2 per 100 patient-years) and 11 in the target 4 group (3.8 per 100 patient-years) (p = 0.019). The 12 recorded episodes of thromboembolism, 4 of which consisted of a visual deficit, were all transient ischemic attacks, 6 in the target 3 group (1.8 per 100 patient-years) and 6 in the target 4 group (2.1 per 100 patient- years). There were 3 vascular deaths in each group (0.9 and 1 per 100 patient-years for target 3 and target 4 groups, respectively). Minor bleeding episodes occurred 85 times (26 per 100 patient-years) in the target 3 group and 123 times (43 per 100 patient-years) in the target 4 group (p = 0.001).Conclusions. Mechanical heart valve patients on anticoagulant treatment who had been operated on at least 6 months earlier experienced fewer bleeding complications when maintained on a moderate intensity regimen (target INR = 3) than those on a moderate-high intensity regimen (target INR = 4). The number of thromboembolic events and vascular deaths did not differ between the two groups.

Beating heart valve surgery as possible alternative for high risk patients

2005 ◽  
Vol 53 (S 3) ◽  
Author(s):  
J Easo ◽  
M Horst ◽  
P Hoelzl ◽  
E Natour ◽  
O Dapunt
Keyword(s):  
High Risk ◽  
Heart Valve ◽  
Beating Heart ◽  
Valve Surgery ◽  
Heart Valve Surgery ◽  
High Risk Patients ◽  
Risk Patients
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