Torção e sua interpretação.

Measurement of Ventricular Torsion by Two-Dimensional Ultrasound Speckle Tracking Imaging
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Artigo completo e livre.
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METHODS: We acquired basal and apical short-axis left ventricular (LV) images in 15 patients to estimate LVtor by STI and compare it with tagged MRI and DTI. Left ventricular torsion was defined as the net difference of LV rotation at the basal and apical planes. For the STI analysis, we used high-frame (104 ± 12 frames/s) second harmonic two-dimensional images.

RESULTS: Data on 13 of 15 patients were usable for STI analysis, and LVtor profile estimated by STI strongly correlated with those by tagged MRI (y = 0.95x + 0.19, r = 0.93, p < 0.0001, analyzed by repeated-measures regression models). The STI torsional velocity profile also correlated well with that by the DTI method (y = 0.79x + 2.4, r = 0.76, p < 0.0001, by repeated-measures regression models) with acceptable bias. . . . Primeiro, veja os movimentos horários e anti das porções basais e apicais:

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Agora acompanhe um ponto e veja como ele se move no eixo:

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Tudo que se move, tem deslocamento e velocidade a serem medidos(Que pode ser positivo ou negativo):

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J Am Coll Cardiol, 2005; 45:2034-2041, doi:10.1016/j.jacc.2005.02.082