Myocardial Strain Imaging in Cardiac Diseases and Cardiomyopathies.
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1 Myocardial Strain Imaging in Cardiac Diseases and Cardiomyopathies. Session: Cardiomyopathy Tarun Pandey MD, FRCR. Associate Professor University of Arkansas for Medical Sciences
2 Disclosures No relevant financial disclosures Research Support Circle CVI PIA Medical
3 Outline/Educational Objectives What is myocardial strain? Why measure myocardial strain? How do we measure myocardial strain? Echo (TDI versus Speckle tracking) MRI Pearls and Pitfalls Clinical Utility & Applications Current literature and Utility of Strain Imaging
4 What is myocardial strain? Strain is defined as the percent change in myocardial deformation. Compression (Shortening) Distraction (Lengthening) This deformation can be conveniently divided into the basic components: longitudinal, radial, circumferential motion.
5 Myocardial Deformation & Strain Theodore P. Abraham et al. Circulation. 2007;116: Copyright American Heart Association, Inc. All rights reserved.
6 Myocardial strain Several strain derivatives can also be calculated: Tissue velocity (velocity of deformation) Strain rate (rate of myocardial deformation) Displacement (displacement of the myocardium during deformation)
7 Why do we need to measure myocardial strain? 1. Detection of altered myocardial performance beyond EF Ejection Fraction Myocardial Strain/Strain rate Limited as a measure of contractility due to load dependency. Limited prognostic value in low-normal or higher range. By the time EF decreases, it is too late! Less Preload dependent Greater utility in those with preserved EF Allows better understanding of progression of preclinical disease to overt heart failure.
8 Why do we need to measure myocardial strain? 1. Detection of altered myocardial performance beyond EF Advanced Age Obesity Hypertension Renal Failure Diabetes Atrial fibrillation Cardiomyopathies Carriers of HCM mutations Duchenne Muscular Dys. Fabry s Valvular heart disease Severe AS AR MS Acute CAD After MI, global strain values may predict subsequent remodeling and function recovery
9 How to measure myocardial strain? Can be measured on Echo and MRI most experience with echocardiography. Two main methods on Echo: Tissue Doppler Imaging Conversion of tissue velocity data to strain and strain rate Speckle tracking Tracking of echo speckles using computer post processing
10 Strain Rate: TDI ε = V1-V2/L ε=strain rate, V1=velocity at point 1, V2=velocity at point 2, and L=length, usually set at 10 mm.
11 TDI: Myocardial strain & Derivatives
12 Strain: Speckle Tracking Strain is calculated as the change in length (L) divided by the original length (L0) and expressed as a percentage.
13 Echocardiographic Myocardial Strain Techniques TDI Indirect measure of strain Derived from myocardial velocities Based on Doppler principle Dependent on angle of insonation Speckle Tracking Direct measure of strain Measures myocardial displacement Based on computer-based tracking of speckles Independent on angle of insonation.
14 Myocardial Strain: MRI techniques Grid tagged MRI Feature Tracking
15 Grid Tagged MRI Fading of grid tags Needs prospective application of tags Cannot use regular Cine Images
16
17 MRI Feature Tracking: LV
18 MRI Feature Tracking: RV
19 RV Strain: Feature Tracking
20 Myocardial strain: Considerations LV Strain Easier to perform Thicker LV walls LV chamber is simpler Greater utility in health and disease RV Strain Technically difficult Thin RV walls Hyper-trabeculated RV More irregular shape and volume Lesser clinical applications No reliable non-invasive surrogate
21 LA Strain
22 Strain: MRI Technique, Pearls & Pitfalls Image Selection Contouring Quality Assurance
23 Strain: MRI Technique, Pearls & Pitfalls Image Selection Use series composer tool to create a full SAX stack Exclude basal images with significant tricuspid or pulmonic systolic valve presence. Exclude apical slices with too much through-plane motion. Select 4CH image most central to the tricuspid valve and which has the clearest myocardium
24 Strain: MRI Technique, Pearls & Pitfalls Contouring All images contoured at end diastole LAX: The septum is excluded. The basal bulge is included as long as it was able to be tracked as well as the free wall myocardium. A LAX RV extent contour (orange) is also used to define the systolic excursion of the tricuspid valve. SAX: The septum is included in the endocardial contour (since it must be a closed surface), but not the epicardial. Nonetheless, like with the 4CH view, only the free wall myocardium is tracked for strain analysis.
25 Strain: MRI Technique, Pearls & Pitfalls Quality Assurance Lengthiest process Use of the cinematic loop is essential to QA. Enable boundary points overlay to assess this. The boundary points reflect the movement of the tracking algorithm, and any time this does not appear to reflect the actual motion of the myocardium, the contours are adjusted to improve the tracking
26 Strain: MRI Technique, Pearls & Pitfalls Quality Assurance If the boundary points move too far in, and end up in the blood pool at systole (green circle), then the contours must be adjusted outwardly. If the boundary points are too far, out, ending up extracardiac during systole (green circle), then the contours must be adjusted inwardly.
27 Strain: MRI Technique, Pearls & Pitfalls Quality Assurance Exclude large artifacts that obscure entire portions of myocardium, yielding nonsensical results from analysis: brightness from the fat obscures the free wall anterolaterally, giving results which are clearly erroneous, with negative radial strain rates in that region.
28 Strain: MRI Technique, Pearls & Pitfalls Quality Assurance Exclude large artifacts that obscure entire portions of myocardium, yielding nonsensical results from analysis: brightness from the fat obscures the free wall anterolaterally, giving results which are clearly erroneous, with negative radial strain rates in that region. The purple region in the ES image, with very poor tracking, can be seen in this regional radial strain graph as a purple trend line, giving paradoxical results
29 Strain: MRI Technique, Pearls & Pitfalls Quality Assurance Exclude large artifacts : As a solution, the entire anterolateral portion of the RV myocardium should be excluded (ED and ES) Caveat: exclusion will render segmental strain analysis incorrect
30 Myocardial Strain: Clinical Applications
31 Gorcsan J et al. J Am Coll Cardiol 2011;58: #1. Heart Failure Normal Heart Failure
32 Longitudinal RV strain in Heart Failure Normal Heart Failure
33 Circ. RV strain in Heart Failure Normal Heart Failure
34 Radial RV strain in Heart Failure Normal Heart Failure
35 Gorcsan J et al. J Am Coll Cardiol 2011;58: #2. Ventricular Dyssynchrony (Radial LV Strain) Normal Heart failure with LBBB
36 Gorcsan J et al. J Am Coll Cardiol 2011;58: Ventricular Dyssynchrony (Circumferential LV Strain) Normal Heart failure with LBBB
37 Strain: Ventricular Dyssynchrony Normal Heart Failure Radial Circumferential
38 #3. Cardiomyopathy
39 Myocardial Strain in Cardiomyopathies Normal Myocardial Amyloidosis
40 LV Strain in Cardiac Amyloidosis Amyloid Normal Amyloid Normal Evaluation of Myocardial Strain in Patients With Amyloidosis Using Cardiac Magnetic Resonance Feature Tracking. Pandey et al, CPDR, 2016
41 RV strain in Myocardial Amyloidosis p= p= p< UAMS Data
42 Apical Sparing in Cardiac Amyloidosis
43 #4: Myocarditis/Pericarditis
44 #4 Myocarditis Vs Pericarditis
45 #4 Myocarditis Vs Pericarditis Myocarditis Pericarditis
46 #4 Myocarditis Vs Pericarditis Pericarditis Myocarditis
47 #4 Myocarditis Vs Pericarditis Myocarditis Pericarditis
48 Conclusions Myocardial strain evaluation with CMR is feasible Evolving field with several challenges Technique Paucity of normative Data Vendor variability Large scale data on clinical utility is lacking. Offers a great opportunity for research and with further refinement it will establish as a useful technique.
49 Thank you
50 Acknowledgement PIA Medical Imaging Sam Alkek. Circle CVI Ron Skostad
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