Double Envelope on Continuous Wave Mitral Inflow Doppler Profile

2019 ◽  
Vol 33 (11) ◽  
pp. 3222-3223 ◽  
Author(s):  
Etienne J. Couture ◽  
Alexander S. Kuo ◽  
Michael N. Andrawes ◽  
Michael G. Fitzsimons
Keyword(s):  
Continuous Wave ◽  
Mitral Inflow ◽  
Doppler Profile ◽  
Double Envelope

scholarly journals A Double Envelope Mitral Inflow Spectral Doppler Profile After a MitraClip

2021 ◽  
Author(s):  
Mara Gavazzoni ◽  
Michel Zuber ◽  
Maurizio Taramasso ◽  
Francesco Maisano ◽  
Rolf Jenni
Keyword(s):  
Mitral Inflow ◽  
Doppler Profile ◽  
Spectral Doppler ◽  
Double Envelope

Abstract 13492: Usefulness of Aortic Valve Area Measurement Obtained by Single-Beat Recording of Double-Envelope Technique in Patients With Aortic Stenosis and Atrial Fibrillation

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Hiroki Oe ◽  
Nobuhisa Watanabe ◽  
Yuko Ohno ◽  
Rika Takemoto ◽  
Madoka Ikeda ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Aortic Valve ◽  
Aortic Stenosis ◽  
Continuous Wave ◽  
Left Ventricular ◽  
Area Measurement ◽  
Aortic Valve Area ◽  
Rr Interval ◽  
Double Envelope ◽  
Valve Area

Introduction: In patients with aortic stenosis (AS) and atrial fibrillation (AF), the conventional continuity equation to evaluate aortic valve area (AVA) is cumbersome, because 5 to 10 cycles are required to ensure accuracy of results. Double-envelope (DE) is obtained by a single continuous-wave Doppler envelope with double density velocity profiles; the inner envelope represents flow across the left ventricular outflow tract and outer envelope represents flow across the aortic valve orifice. Hypothesis: The aim of this study to evaluate the usefulness of the AVA calculated from single-beat recorded inner and outer envelopes in patients with AS and AF. Methods: Eighteen AS patients (74.6±7.2 years old) with AF were examined by transthoracic echocardiography. The conventional AVA (PW/CW technique) was calculated from nonsimultaneously measured LVOT flow and AVO flow in randomly picked up 8 cardiac cycles, respectively. The AVA (DE technique) was calculated from the inner and outer envelopes simultaneously recorded. A single-beat AVA was calculated from simultaneously recorded inner and outer envelopes (by DE technique) when the preceding RR interval/pre-preceding RR interval = 1. Bland-Altman analysis was used to compare the results of two techniques and estimate the reproducibility. Results: DE profiles were successfully obtained in all patients, and mean AVA (PW/CW technique) was 1.09±0.19 cm2. AVA by Single-beat DE technique showed good correlation with that by PW/CW technique (r=0.90), and the mean bias in the AVA measurements between by PW/CW technique and by DE technique was 0.048 cm2. (Figure) Conclusions: AVA in patients with AS and AF obtained by Single-beat DE technique was feasible and in good agreement with that by PW/CW technique. We suggest that DE technique should be considered to estimate the subtle temporal change of AVA in patient with AS and AF more simply and accurately.

Microstructures of Laser Processed Fe-Cr Surface Alloys

1981 ◽  
Vol 39 ◽  
pp. 328-329
Author(s):  
P. A. Molian ◽  
K. H. Khan ◽  
W. E. Wood
Keyword(s):  
Cooling Rate ◽  
Pure Iron ◽  
Continuous Wave ◽  
Laser Surface ◽  
Material Surface ◽  
Constitution Diagram ◽  
Incident Power ◽  
Surface Alloying ◽  
Laser Surface Alloying ◽  
Spot Diameter

In recent years, the effects of chromium on the transformation characteristics of pure iron and the structures produced thereby have been extensively studied as a function of cooling rate. In this paper, we present TEM observations made on specimens of Fe-10% Cr and Fe-20% Cr alloys produced through laser surface alloying process with an estimated cooling rate of 8.8 x 104°C/sec. These two chromium levels were selected in order to study their phase transformation characteristics which are dissimilar in the two cases as predicted by the constitution diagram. Pure iron (C<0.01%, Si<0.01%, Mn<0.01%, S=0.003%, P=0.008%) was electrodeposited with chromium to the thicknesses of 40 and 70μm and then vacuum degassed at 400°F to remove the hydrogen formed during electroplating. Laser surface alloying of chromium into the iron substrate was then performed employing a continuous wave CO2 laser operated at an incident power of 1200 watts. The laser beam, defocussed to a spot diameter of 0.25mm, scanned the material surface at a rate of 30mm/sec, (70 ipm).

1848: Revolix 70 Watt 2 Micron Continuous Wave Laser Vaporesection of the Prostate. Preliminary Results After a One Year Follow-Up

2007 ◽  
Vol 177 (4S) ◽  
pp. 614-614
Author(s):  
Thorsten Bach ◽  
Thomas R.W. Herrmann ◽  
Roman Ganzer ◽  
Andreas J. Gross
Keyword(s):  
Continuous Wave ◽  
Continuous Wave Laser ◽  
Preliminary Results ◽  
Wave Laser ◽  
One Year

Leitlinien zur peripheren Gefäßdiagnostik mit der direktionalen continuous-wave (CW) Doppler-Sonographie

Phlebologie ◽  
2000 ◽  
Vol 29 (05) ◽  
pp. 142-145
Author(s):  
T. Hertel ◽  
B. Kahle ◽  
H. G. Kluess ◽  
M. Marshall ◽  
E. Rabe ◽  
...  
Keyword(s):  
Continuous Wave

Investigating the Nonlinear Optical Response of Pepper Oil under Low Power Irradiation with Continuous Wave Visible Laser Beam

2020 ◽  
pp. 131-138
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Diffraction Integral ◽  
Visible Laser ◽  
Limiting Property ◽  
Kirchhoff Diffraction Integral ◽  
Theoretical Results ◽  
Good Agreement

The nonlinear optical properties of pepper oil are studied by diffraction ring patterns and Z-scan techniques with continuous wave beam from solid state laser at 473 nm wavelength. The nonlinear refractive index of the sample is calculated by both techniques. The sample show high nonlinear refractive index. Based on Fresnel-Kirchhoff diffraction integral, the far-field intensity distributions of ring patterns have been calculated. It is found that the experimental results are in good agreement with the theoretical results. Also the optical limiting property of pepper oil is reported. The results obtained in this study prove that the pepper oil has applications in nonlinear optical devices.

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