Tissue Doppler and Strain Imaging. Steven J. Lester MD, FRCP(C), FACC, FASE
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1 Tissue Doppler and Strain Imaging Steven J. Lester MD, FRCP(C), FACC, FASE
2 Relevant Financial Relationship(s) None Off Label Usage None
3 a. Turn the wall filters on and turn down the receiver gain. b. Turn the wall filters off and turn up the receiver gain. c. Turn the wall filters off and turn down the receiver gain. d. Turn the wall filters on and turn up the receiver gain.
4 a. You measure strain along the axis of the ultrasound beam. b. Velocity and strain measurements are measured from standard gray-scale images. c. Myocardial velocity measurements are not influenced by translational or tethering motion as they are when obtained by pulsed wave tissue Doppler imaging. d. You can measure longitudinal but not circumferential or radial strain.
5 a. Higher b. Lower c. The same
6 Objective way with which to quantify the minor amplitude and temporal subtleties in motion
7
8 1. What is myocardial imaging? 2. Potential Clinical Applications 3. Impediments to widespread clinical adoption.
9 Christian Andreas Doppler Positive Frequency Shift Emitted Frequency (fo) Reflected Frequency (fr) (fr-fo) = 2fo v (cosθ) / c C= average speed of sound in tissue (1540m/sec)
10 Doppler Tissue Imaging 1. Turn wall filters off 2. Turn down the gain
11 Septal Myocardial Velocity Traces S1 S2 e a
12 Normal
13 To Detect Regional Wall Motion
14 Peak Pulsed Velocities TD Mean Color Velocities TD 14 11
15 Translation and Tethering
16 Strain = deformation resulting from applied force Stress = force Courtesy of Ted Abraham
17 Used to describe elastic properties of cardiac muscle (Mirsky and Parmley: Circ Res, 1973) Strain ( ) = L 1 -L 0 L 0 10 cm Strain rate 8 L 0 L 1-20% cm +20% 12 cm 0% 10 cm
18 Rate of deformation High strain rate Low strain rate Equal strain Courtesy of Andreas Heimdal
19 AoC Basal Mid wall Apical Basal Mid wall Apical
20 Movement of the myocardium relative to the sample volume fixed in space
21 Speckle Tracking Velocity is estimated as a shift of each object divided by time between successive frames (or multiplied by Frame Rate)--> 2D vector: (Vx, Vy) = (dx, dy) * FR Y dy 0 dx New location Old location X Courtesy Peter Lysysanksy
22 Potential Advantage? Signal noise Speckle tracking by principle is angle independent Gray scale (standard views) Monitor strain in two rather than one dimension Minimal user input Assessment of rotation: derived from circumferential strain at different levels in the heart (NO fixed sample volume)
23 Rotation/Twist/Torsion
24 Rotation and Torsion Rotation Basal Rotation Torsion Apex View from apex
25 Normal Abnormal relaxation Pseudonormalization Restriction Mitral flow E A Tissue Doppler E A Apical rotation Basal rotation LV torsion Park et al: J Am Soc Echo Cardiogr 21:1129, 2008
26 Potential Clinical Applications
27 Impaired Systolic Function by Strain Imaging in Heart Failure With Preserved Ejection Fraction Strain Imaging detects impaired systolic function despite preserved global LVEF in HFpEF that may contribute to the pathophysiology of the HFpEF syndrome. J Am Coll Cardiol 2014;63:447-56
28 Strain (%) 0 Controls Hypertensive Heart Disease HFpEF Longitudinal Circumferential * * * * *p< compared to controls and between HHD and HFpEF J Am Coll Cardiol 2014;63:447-56
29 Longitudinal Strain NT-proBNP
30
31 Cardio-Oncology
32 76 year old male CMML/MDS with associated myeloid sarcoma skin lesions Experimental Chemotherapy ABT-348
33 Baseline 2 Months LVEF = 66% LVEF = 58%
34 Baseline 2 Months LVEF = 66% LVEF = 58% GLPSS Avg = -17.8% Troponin T = 0.02 GLPSS Avg = -14.3% Troponin T = 0.03
35 Global Longitudinal Peak Systolic Strain (GLS) Members of the in Chamber the range Quantification of -20% Writing Group are: Roberto M. Lang, MD, FASE, et al - Optimize image quality, maximize frame rate and minimize foreshortening. - When regional tracking is suboptimal in more than two J Am myocardial Soc Echocardiogr segments 2015;28:1-39 in a single view the calculation of GLS should be avoided.
36 Aortic Valve closure
37
38
39 Anthracyclines and Trastuzumab Can we predict a later (3 months) decline in LVEF? No decrease in GLS > 10% or elevated hstni have a 3% probability of a decrease in LVEF. If either a decrease in GLS or elevated hstni have a 9X increased risk for cardiotoxicity compared to those with no changes in either of these markers.
40 CRTCD if decrease in LVEF >10% to a value <53% - GLS -Reversible: is the optimal to within parameter 5 percentage of deformation points of for the baseline early detection of subclinical LV dysfunction. - In patients -Partially with reversible: available improved baseline by strain >10 percentage points measurements, from the nadir a but relative remaining percentage >5 percentage reduction points of below GLS baseline of <8% from baseline appears not to be meaningful, -Irreversible: and improved those >15% by <10 from percentage baseline are points very from likely the to nadir be and abnormal. remaining >5 percentage points below baseline
41 Athlete HTN HCM Infiltrative -amyloid Storage -Fabry
42 The Thinker Auguste Rodin
43
44 J Am Soc Echocardiogr 2013;26: Patients with HCM have significantly limited systolic function reserve and more dynamic dyssynchrony with exercise compared with those with HTN
45 Controls HTN HCM Rest Strain (%) * ** Exercise Strain (%) Rest TTP-SD (msec) Exercise TTP-SD (msec) Septal Thickness (mm) * ** ** * ** * **
46 Normal Abnormal relaxation Pseudonormalization Restriction Mitral flow E A Tissue Doppler E A Apical rotation Basal rotation LV torsion Park et al: J Am Soc Echo Cardiogr 21:1129, 2008
47 Controls HTN HCM Rest Circumferential Strain (%) Circumferential Strain Exercise (%) Septal Thickness (mm) * ** * ** * **
48 Apical HCM Septal HCM
49 Application of a Parametric Display of Two-Dimensional Speckle-Tracking Longitudinal Strain to Improve the Etiologic Diagnosis of Mild to Moderate Left Ventricular Hypertrophy J Am Soc Echocardiogr 2014;27:888-95
50 Cardiac Amyloidosis Hypertensive Heart Disease Hypertrophic Cardiomyopathy 14mm 14mm 13mm Mean Wall Left Ventricular Thickness
51
52 Longitudinal Strain (%) AVC Longitudinal Velocity cm/sec)
53 Torsion (degrees) 7º
54 Longitudinal Strain (%) AVC Longitudinal Velocity cm/sec)
55 Torsion (degrees) 16º
56 J Am Coll Cardiol Img 2014;7: LV dysfunction is frequently subclinical despite a normal ejection fraction. It may preceded the onset of symptoms an portend a poor outcome - The advent of novel tissue-tracking echo techniques has unleashed new opportunities for the clinical identification of early abnormalities in LV function.
57 Impediments to Clinical Adoption? 1. Standardization 2. Workflow
58 Echocardiographic Measures of Myocardial Deformation by Speckle-Tracking Technologies: The Need for Standardization? J Am Soc Echocardiogr 2012:25:
59 (GE Vivid 7)
60 Image Area EchoInsight GLS % vs %; p= Movie GE
61 Need For Standardization Endocardium Endocardium/Epicardium Average of peaks Natural Lagrangian Natural Lagrangian Systole ± ± ± ±2.53 Systole/ diastole ± ±2.90* ± ±2.57 Peak of average vs ; p=0.02 Systole ± ± ± ±2.75 Systole/ diastole ± ± ± ±2.69 *Significant difference (P<.05) compared with Image-Arena GLS Significant difference (P<.001) compared with Image-Arena GLS J Am Soc Echocardiogr 2012:25:
62 vs ; p=0.02
63
64
65 ± ± ± ± ± ± ± ± ± ± GLS AV, % Hitachi-A Esaote GE Philips Samsung Siemens Toshiba Epsilon Tomtec Mean of All Farsalinos et al. J Am Soc Echocardiogr 2015;28:
66 Mean Error, % GLS AV E E/A IVS LVEDD PW GLS AV Farsalinos et al. J Am Soc Echocardiogr 2015;28:
67 GLS AV, % Hitachi-A Esaote GE Philips Samsung Siemens Toshiba Epsilon Tomtec EF BI Farsalinos et al. J Am Soc Echocardiogr 2015;28:
68 Cross vendor variability in peak systolic global longitudinal strain may now be less than that of measures of left ventricular ejection fraction J Am Soc Echocardiogr 2015;28:183-93
69 Any innovation in imaging must be paralleled or exceeded by an innovation in workflow.
70 Fully Automated Versus Standard Tracking of Left Ventricular Ejection Fraction and Longitudinal Strain The Fast-EFs Multicenter Study J Am Coll Cardiol 2015;66:
71
72 1. AutoLV measurements were feasible in 98% of studies. 2. Average analysis time was 8+1 sec/patient. 3. Interobserver variability was higher for both visual and manual EF, but not different for LS.
73 Simultaneous measurement of Strain and Ejection Fraction Images courtesy of J. D Hooge et. al. Longitudinal Strain Regional Ejection Fraction Measures systolic shortening Sensitive measure of myocardium function Measures fractional change in volume Established, commonly used metric
74 Analysis October January EF Strain
75 Lower resolution (spatial and temporal)
76 a promising approach J Am Soc Echocardiogr 2012;25:68-79
77 What s Next Starts Soon Standardization Workflow Efficiency
78 It doesn t matter how slowly you go as long as you do Confucius not stop
79 1. DTI characterizes the low velocity, high intensity signals that come from the wall. 2. DTI is limited to movement relative to the sample volume fixed in space 3. Velocity: pitfalls of tethering and translational motion
80 4. Local parameters of deformation (strain and strain rate) are not influenced by tethering or translational motion 5. Feature or Speckle tracking can evaluate velocity, strain and strain rate from standard gray scale images 6. Feature tracking permits assessment of strain in the axis of movement rather than the axis of the ultrasound beam.
81 a. Turn the wall filters on and turn down the receiver gain. b. Turn the wall filters off and turn up the receiver gain. c. Turn the wall filters off and turn down the receiver gain. d. Turn the wall filters on and turn up the receiver gain.
82 a. You measure strain along the axis of the ultrasound beam. b. Velocity and strain measurements are measured from standard gray-scale images. c. Myocardial velocity measurements are not influenced by translational or tethering motion as they are when obtained by pulsed wave tissue Doppler imaging. d. You can measure longitudinal but not circumferential or radial strain.
83 a. Higher b. Lower c. The same
84
Tissue Doppler and Strain Imaging
Tissue Doppler and Strain Imaging Steven J. Lester MD, FRCP(C), FACC, FASE Relevant Financial Relationship(s) None Off Label Usage None 1 Objective way with which to quantify the minor amplitude and temporal
Tissue Doppler and Strain Imaging
Tissue Doppler and Strain Imaging Steven J. Lester MD, FRCP(C), FACC, FASE Relevant Financial Relationship(s) None Off Label Usage None 1 Objective way with which to quantify the minor amplitude and temporal
DISCLOSURE. Myocardial Mechanics. Relevant Financial Relationship(s) Off Label Usage
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