Comparison of Automatic Boundary Detection and Manual Tracing Technique in Echocardiographic Determination of Left Atrial Volume

Zhang, Gui Can; Tsukada, Takeshi; Nakatani, Satoshi; Uematsu, Masaaki; Yasumura, Yoshio; Tanaka, Norio; Masuda, Yoshikazu; Miyatake, Kunio; Yamagishi, Masakazu

doi:10.1253/jcj.62.755

Cited by 7 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Automated boundary detection from the apical four-chamber approach could provide an accurate estimation of left atrial volume change, suggesting the potential value of this method in assessing left atrial function [20] . Previous reports have indicated that echocardiography with automated boundary detection is useful for the non-invasive estimation of left ventricular volume.…”

Section: Automated Boundary Detection Echocardiographymentioning

confidence: 99%

A clinical appraisal of left atrial function

Stefanadis

Dernellis

Toutouzas

2001

European Heart Journal

250

245

View full text Add to dashboard Cite

The left atrium modulates left ventricular filling through three components: a phase of reservoir or expansion during systole, a conduit phase during diastole, and an active contractile component (when sinus rhythm is present) during late diastole. This active contractile component of the left atrium has an important role in patients with ventricular dysfunction as a 'booster pump' to augment ventricular volume. Augmented left atrial booster function is one of the mechanisms compensating for decreased early filling in patients with reduced left ventricular compliance, whereas a loss of atrial contraction, as a result of atrial fibrillation or ventricular pacing, reduces cardiac output by approximately 15-20% [1,2] .During exercise left atrial reservoir and booster functions are augmented, whereas conduit function is not; increased reservoir function may play an important role in accelerating left ventricular filling by helping to maintain an enhanced atrioventricular pressure gradient during diastole and also by increasing left atrial booster function through an increase in preload [3] . An isolated decrease in left atrial compliance is associated with relative increases in the conduit function of the left atrium. The ability to optimally redistribute left ventricular filling among reservoir, conduit and boosterpump functions is a potentially important adaptation that may occur in the left atrium in response to changing haemodynamics [4] . Frank-Starling mechanismThe stretch of the atrium was controlled by intra-atrial pressure. The Frank-Starling behaviour of the atrium was manifested as a biphasic increase of the contraction force after increasing the stretch level. The development of the contraction force after step increase of the stretch (intra-atrial pressure from 1 to 3 mmHg) was accompanied by an increase in the amplitude of the calcium transients and a decrease in the time constant of Ca 2+ transient decay. The stretch-activated channel activation led to gradual augmentation of Ca 2+ transients, which modulated the action potentials through increased Na + /Ca 2+ -exchanger inward current. The role of troponin C affinity change was to modulate the Ca 2+ transients, stabilize the diastolic [Ca 2+] i, and presumably to produce the immediate increase of the contraction force after stretch seen in experiments. The same mechanism that caused the normal physiological responses to stretch could also generate arrhythmogenic afterpotentials at high stretch levels in the model [15] .With a stepwise decrease in the pacing rate from 110 beats . min 1 to 70 beats . min 1 , the left atrial dimension increases just before atrial contraction and left atrial systolic shortening increases as well. However, the calculated left ventricular filling volume during atrial systole decreases. The pulmonary venous flow during atrial systole is directed toward the left atrium, and the left atrial influx volume from pulmonary venous flow decreases. With a decrease in the pacing rate, the left atrial Frank-Starling mechanism operates....

show abstract

Section: Automated Boundary Detection Echocardiographymentioning

confidence: 99%

A clinical appraisal of left atrial function

Stefanadis

Dernellis

Toutouzas

2001

European Heart Journal

250

245

View full text Add to dashboard Cite

show abstract

“…Although three-dimensional echocardiography [9] and acoustic quantification (AQ) [10,11] have been used for the evaluation of these LA functions, they were somewhat complicated to obtain reliable results. Recent advances in two-dimensional speckle tracking technique (2DST) enabled analyzing time-LA volume curve [12].…”

Section: Introductionmentioning

confidence: 99%

Impact of reduced left atrial functions on diagnosis of paroxysmal atrial fibrillation: Results from analysis of time-left atrial volume curve determined by two-dimensional speckle tracking

Mori

Kanzaki

Amaki

et al. 2011

Journal of Cardiology

Self Cite

View full text Add to dashboard Cite

show abstract

“…AQ studies have mostly focused on left ventricular functions; there are, to our knowledge, few studies in the literature applying this method to determine LA volumes in rhythm disturbances. The 24) Although prophylactic antiarrhythmic therapy lowers the relapses, the recurrence rate of AF is still high, predominantly occurring within the first month after cardioversion. Some clinical variables predicting the chance of maintaining sinus rhythm have been suggested, including the duration of AF, LA size, presence of rheumatic valvular disease, and low functional capacity.…”

Section: Discussionmentioning

confidence: 99%

Left Atrial Maximum Volume Is a Recurrence Predictor in Lone Atrial Fibrillation. An Acoustic Quantification Study.

et al. 2002

View full text Add to dashboard Cite

SUMMARYPredictors of recurrence in lone atrial fibrillation have not been clearly identified. Acoustic quantification (AQ) is a promising method in the assessment of left atrial (LA) volumes. The purpose of the present study was to investigate the potential of LA volumes obtained by standard manual tracing and AQ methods in predicting AF-recurrence after restoring the sinus rhythm in patients with lone AF, and to test the agreement between the two approaches. Standard echocardiography combined with AQ was performed in 28 patients with lone AF one hour after the sinus rhythm was regained, and in 10 controls. LA volumes were determined by conventional manual tracing and AQ methods. AQ waveforms of LA were obtained by drawing a region of interest around the LA border. The agreement of the two methods was tested by Bland-Altman analysis. Patients were followed up for 6 months for the occurrence of AF recurrence. A good correlation was observed between AQ and manual tracing methods in determining both minimal (r=0.59) and maximal (r=0.88) LA volumes. Patients with AF recurrence had a significantly larger maximum LA volume as assessed with both methods (P<0.05 for both). M-mode derived LA dimension and isovolumic relaxation time were additional predictors of recurrence in patients with lone AF. In lone AF, patients prone to recurrence could be predicted by determining LA maximum volume assessed either by AQ or manual tracing methods. AQ provides on-line, accurate estimation of LA volumes. (Jpn Heart J 2002; 43: 241-248)

show abstract

Comparison of Automatic Boundary Detection and Manual Tracing Technique in Echocardiographic Determination of Left Atrial Volume

Cited by 7 publications

References 19 publications

A clinical appraisal of left atrial function

A clinical appraisal of left atrial function

Impact of reduced left atrial functions on diagnosis of paroxysmal atrial fibrillation: Results from analysis of time-left atrial volume curve determined by two-dimensional speckle tracking

Left Atrial Maximum Volume Is a Recurrence Predictor in Lone Atrial Fibrillation. An Acoustic Quantification Study.

Contact Info

Product

Resources

About