Measurement of Ventricular Torsion by Two-Dimensional Ultrasound Speckle Tracking Imaging

Notomi, Yuichi; Shiota, Takahiro; Popović, Zoran B.; Weaver, Joan A.; Oryszak, Stephanie J.; Greenberg, Neil L.; White, Richard D.; Thomas, James D.; Setser, Randolph M.; Lysyansky, Peter; Martin-Miklovic, Maureen G.

doi:10.1016/j.jacc.2005.02.082

Cited by 681 publications

(638 citation statements)

References 41 publications

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“…23 Our analysis of LV torsion parameters confirms that normal pregnancy results in an increase in LV Tor and peak torsion velocity, and that this change is due to increased apical rotation. We have expanded on existing knowledge by providing torsion values for the third trimester of pregnancy, and have shown that systolic BP is an independent predictor of increased LV Tor .…”

Section: Resultssupporting

confidence: 79%

“…The study group consisted of 55 women, of whom 32 were pregnant (mean gestation 199 ± 48 d) and 23 were not pregnant at the time of echocardiogram. No adverse fetal events or peripartum complications occurred in the pregnant subjects.…”

Section: Resultsmentioning

confidence: 99%

“…The automated software then calculated the rotation and rotational velocities of the region of interest. 22,23 The motion of the apex and base are conventionally described from an apex-to-base view down the longitudinal axis of the LV, with clockwise rotations measured in negative degrees and counterclockwise rotations measured in positive degrees (Figure 1). Left ventricular torsion is the sum of maximal instantaneous basal-to-apex angle difference, expressed in degrees.…”

Section: Echocardiography Protocolmentioning

confidence: 99%

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Left Ventricular Torsional Mechanics in Uncomplicated Pregnancy

Yoon

Song²,

Megalla³

et al. 2011

Clinical Cardiology

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Background: Alterations in left ventricular (LV) twist (torsion) and untwist have been described for a variety of physiologic and pathologic conditions. Little information is available regarding changes in these parameters during normal pregnancy. Hypothesis: Pregnancy is associated with significant changes in LV torsional mechanics. Methods: Left ventricular twist and untwist was measured in 32 pregnant females (mean gestation 199 ± 48 d) and 23 nonpregnant controls using speckle-tracking echocardiography.Results: Left ventricular ejection fraction (68 ± 5% vs 66 ± 5%) was similar between the groups (P not significant). There was a significant increase in peak LV twist from nonpregnant controls (9.4 ± 3.7 degrees) to second-trimester (12.0 ± 4.2 degrees) and third-trimester subjects (12.6 ± 5.9 degrees, all P < 0.05). Peak LV twist velocity was also increased in second-and third-trimester groups compared with controls (94 ± 24 degrees/sec and 93 ± 30 vs 64 ± 21 degrees/sec, respectively, both P < 0.05). Both peak untwist velocity and time to peak untwist velocity were not significantly different between groups (P not significant). Multiple regression analysis indicate that only systolic blood pressure (r = 0.394, P = 0.005) was an independent predictor for increased LV torsion. Conclusions: There are significant changes in LV torsional indices during the course of pregnancy, whereas untwist parameters remain unchanged. Blood pressure is independently associated with increased torsion during pregnancy. IntroductionPregnancy is associated with reversible adaptations in maternal systolic and diastolic left ventricular (LV) function. 1,2 Prior studies have shown increased preload and cardiac output, 3 -5 decreased systemic vascular resistance, 2,6 and increased LV mass and wall thickness 7 during pregnancy. Changes in LV fractional shortening are less well-defined, with the literature offering conflicting data. 8 -10 Little information is available concerning alterations in LV torsion (LV Tor ), the helical twisting motion of the LV about its longitudinal long axis. 11 Speckle-tracking echocardiography (STE) is a noninvasive method that allows for rapid, objective quantification of LV Tor . 12 Numerous studies have demonstrated that STE can accurately quantify differences in LV Tor associated with various pathophysiologic conditions. 13 -16 We used STE to measure LV Tor in healthy pregnant women and nonpregnant controls.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Echocardiography Protocolmentioning

confidence: 99%

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Left Ventricular Torsional Mechanics in Uncomplicated Pregnancy

Yoon

Song²,

Megalla³

et al. 2011

Clinical Cardiology

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“…Torsion can be measured by TDI and 2D speckle tracking, with both methods correlating with MRI 155 , 156 . Speckle tracking is the preferred technique given its angle independence and higher reproducibility; however, studies utilising this modality have demonstrated incongruent results.…”

Section: Torsion/twist Mechanicsmentioning

confidence: 99%

Echocardiographic evaluation of diastolic heart failure

Thomas

2010

Australas J Ultrason Med

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“…Torsion is a function of LV contractility and varies linearly with EF 81 while “untwisting” correlates with the relaxation time constant (τ) 82 . Both TDI and speckle tracking can measure torsion and correlate with MRI 83 , 84 . Twist mechanics can be applied in disease states; in hypertension, diastolic LV untwisting was delayed and reduced in parallel to the severity of LV hypertrophy 85 , while in AMI patients, apical LV twist was severely depressed 86 .…”

Section: Newer Parameters and Applicationmentioning

confidence: 99%

Echocardiographic evaluation of systolic heart failure

Thomas

2009

Australas J Ultrason Med

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Echocardiography is the most commonly used modality for evaluating left ventricular size and function in the context of systolic heart failure. Traditional techniques, though extensively used, have their limitations and more recently several newer technologies have emerged that are more reproducible, provide prognostic information, guide therapies and have an important role in monitoring progress. This review will evaluate the traditional and more novel techniques used and briefly provide an overview of the role of echocardiography in guiding and monitoring therapies in patients with systolic heart failure.

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Measurement of Ventricular Torsion by Two-Dimensional Ultrasound Speckle Tracking Imaging

Cited by 681 publications

References 41 publications

Left Ventricular Torsional Mechanics in Uncomplicated Pregnancy

Left Ventricular Torsional Mechanics in Uncomplicated Pregnancy

Echocardiographic evaluation of diastolic heart failure

Echocardiographic evaluation of systolic heart failure

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