Pitfalls in creation of left atrial pressure-area relationships with automated border detection

Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography
A KerenS D Nikolic

Abstract

Creation of pressure-area relationships (loops) with automated border detection (ABD) involves correction for the variable inherent delay in the ABD signal relative to the pressure recording. This article summarizes (1) the results of in vitro experiments performed to define the range of, and factors that might influence, the ABD delay; (2) the difficulties encountered in evaluating a thin-walled structure like the left atrium in the dog model; and (3) the solutions to some of the difficulties found. The in vitro experiments showed that the ABD delay relative to high-fidelity pressure recordings ranges from 20 to 34 msec and 35 to 57 msec at echocardiographic frame rates of 60/sec and 33/sec, respectively. The delay was not influenced significantly by the type of transducer used, distance from the target area, or size of the target area. The delay in the ABD signal, relative to the echocardiographic image, ranges from nil to less than one frame duration, whereas it is delayed one to two frame durations relative to the electrocardiogram processed by the imaging system. In the dog model, inclusion of even small areas outside the left atrium rendered curves with apparent physiologic contour but inappropriately long delays of 90 to...Continue Reading

References

Feb 11, 1992·Journal of the American College of Cardiology·J E PérezB E Sobel
Apr 1, 1994·Journal of the American College of Cardiology·A ChenzbraunR L Popp
Mar 1, 1994·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·R L MorrisseyM H Picard
Nov 1, 1993·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·W J StewartE Salcedo

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Citations

Nov 13, 1998·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·K T SpencerR M Lang
Feb 15, 2001·Echocardiography·Christodoulos StefanadisPavlos Toutouzas
Feb 23, 2007·Echocardiography·Engin BozkurtSebahattin Atesal
Aug 29, 2014·International Journal of Molecular Sciences·Raman MehrzadDavid H Spodick

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