Perigo: Machine Learning chegando

Results

Disease prevalence of our cohort was 29.4%. The area under the curve for the classification result on validation set was 0.87, and the average analysis time was 10 ± 3 ms per subject. Sensitivity, specificity and accuracy were 88.9%, 73.3% and 77.8%, respectively.

http://www.onlinejacc.org/content/73/9_Supplement_1/1610

Função ventricular em 2019

https://www.mayoclinicproceedings.org/article/S0025-6196(18)30654-2/fulltext

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Table 

Normal Values for the Assessment of Left Ventricular Function a

ParameterValue
Left ventricular ejection fraction (%)≥52 (males)≥54 (females)
Stroke volume (mL), range70-100
Rate of ventricular pressure rise (mm Hg/s)>1200
Global longitudinal strain (2-D) (%), mean (range)−20 (−15.9 to −22.1)
Global circumferential strain (2-D) (%), mean (range)−23 (−20.9 to −27.8)
Global radial strain (2-D) (%), mean (range)+47 (+35.1 to +59.0)

a2-D = two-dimensional.

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Pena que a técnica abaixo não vingou na rotina

Doppler Assessment of Stroke Volume

Cardiac stroke volume can be estimated by multiplying the velocity-time integral obtained from Doppler examination of the LV outflow tract by the LV outflow tract area . Doppler examination requires parallel alignment of the pulse-wave beam with the LV outflow tract. Nonparallel beam alignment can result in a reduced LV stroke volume by underestimating the velocity-time integral. Furthermore, this method requires accurate estimation of the LV outflow tract diameter; minor inaccuracies in diameter estimation result in marked errors in the area calculation because of the squaring of the radius.

Mas padece dos mesmos vícios que a estimativa de área valvar na estenose aórtica.

Assessment of LV function remains the most common reason for cardiac imaging because of its powerful ability to predict morbidity and mortality. Current routine methods of quantifying LV function (with LVEF) is not without limitations. Strain imaging that uses speckle tracking in 2-D and 3-D offers promise for quantifying LV function, particularly for patients with borderline LV function, because of the potential to identify subclinical disease. Strain imaging offers the treating physician a unique opportunity to alter management before the onset of overt LV dysfunction, which may, in turn, improve prognosis.