MR Assessment of Myocardial Viability
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1 MR Assessment of Myocardial Viability
2 Definition of Viability Clinical Metabolism: Presence of glucose uptake Perfusion / Perfusion reserve Morphology: Wall thickness, wall thickening Contractility: Recovery after treatment / Contractile reserve Histologic Presence of living myocytes Kim et al. Herz 2000
3 Merits of MRI as one-stop exam Morphology Function Perfusion Viability Coronary Artery Metabolism Flow Measurement
4 Merits of MRI as one-stop exam Morphology: T2 WI, T1 WI Function: Cine MR, Myocardial Tagging Perfusion: MR Perfusion (rest/stress) Viability: Delayed Enhancement, Low dose DSMR etc. Coronary Artery: Coronary MR angiography Metabolism: 31 P, 1 H MR Spectroscopy etc Flow Measurement: Coronary flow reserve
5 Merits of MRI as one-stop exam Morphology: T2 WI, T1 WI Function: Cine MR, Myocardial Tagging Perfusion: MR Perfusion (rest/stress) Viability: Delayed Enhancement, Low dose DSMR etc. Coronary Artery: Coronary MR angiography Metabolism: 31 P, 1 H MR Spectroscopy etc Flow Measurement: Coronary flow reserve
6 MRI for Myocardial Viability 1. Detection of Myocyte necrosis or scar: Delayed Enhancement (DE) MRI 2. Assessment of LV function: Myocardial mass: End-diastolic wall thickness LV contractility: End-systolic wall thickening Contractile (inotropic) reserve
7 ECG I. Delayed Enhancement MRI R R R Trigger Non-selective 180 o inversion trigger delay 23 α 1 α 2 α 12 α 13 α TI msecs M z Infarct Non-selective 180 o inversion M z Normal... Segmented IR Turbo-FLASH
8 DE-MRI vs TTC 3 days after infarct Kim et al. Circulation 1999
9 Reperfused vs Non-reperfused Infarction Kim et al. Circulation 1999
10 Delayed Enhancement MRI Area of delayed enhancement = nonviable myocardium (Bright is dead!!!) Kim RJ et al, Circulation 1999 Fieno et al, JACC 2000
11 Delayed Enhancement MRI CLINICAL IMPLICATIONS Detection of Myocardial Infarction - Acute Infarction - Chronic (healed) Infarction Prediction of Functional Recovery after Revascularization Treatment
12 DE-MRI vs SPECT Transmural infarction
13 DE-MRI vs SPECT DE-MRI Stress SPECT Rest SPECT Subendocardial infarction
14 Detection of MI: DE-MRI vs SPECT A study in 12 dogs SPECT CE-MRI TTC SPECT CE-MRI TTC Wagner et al. Lancet 2003
15 Detection of MI: DE-MRI vs SPECT Detection of subendocardial infarcts CE-MRI SPECT *Animal Research 100/109 (92%) 31/109 (28%) + Human Study 181/181 (100%) 96/181 (53%) *Gold standard : TTC, + Gold standard : CE-MRI Wagner et al. Lancet 2003
16 DE-MRI vs PET In severe ischemic heart failure, hyperenhancement on DE-MRI as a marker of myocardial scar closely agrees with PET data. Klein et al Circulation 2002
17 Detection of MI: DE-MRI vs PET A study in 31 patients with ischemic heart failure PET(t) PET(nt) PET(v) MRI(t) MRI(nt) MRI(v) t : transmural, nt : non-transmural, v : viable Klein et al Circulation 2002
18 Lee SD 76/F C.C : Aggravated dyspnea for 1 week PMH: Diabetes mellitus for 10 years Cardiac Echo: Hypokinesia on anterolateral wall, apical to basal Cardiac enzyme : CK(EM)( U/L) : 265 CK-MB( ng/ml) : 3682 Troponin -I (0-1.5) : 20.2 EKG : Lateral AMI
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21 Detection of Multiple Foci of MI: In Addition to the Expected Lesion
22 47/F chest pain Induced ischemia: mid-anterolateral wall Normal motion / no enhancement: viable!! REST STRESS
23 DE-MRI: CLINICAL IMPLICATIONS Detection of Myocardial Infarction - Acute Infarction - Chronic (healed) Infarction Prediction of Functional Recovery after Revascularization Treatment
24 DE-MRI Detection of Healed MI Large Infarct Hx: 10 months 5 months 4 months CK: 3300 IU/L 5912 IU/L 3352 IU/L MB: 294 g/l 792 g/l 389 g/l Wu et al. Lancet 2001
25 DE-MRI Detection of Healed MI Small Infarct Hx: 13 months 2 months 3 months CK: 513 IU/L 219 IU/L 508 IU/L MB: 62 g/l 12 g/l 35 g/l Wu et al. Lancet 2001
26 Limitations of DE-MRI: Differentiation between Acute and Chronic MI? T2 WI SPECT Lim TH et al, JMRI 1997
27 DE-MRI vs T2 MRI T2 WI Acute MI ( 5 days ago) DE-MRI
28 DE-MRI vs T2 MRI T2 WI Chronic MI (9 years Hx) DE-MRI
29 DE-MRI: CLINICAL IMPLICATIONS Detection of Myocardial Infarction - Acute Infarction - Chronic (healed) Infarction Prediction of Functional Recovery after Revascularization Treatment
30 DE-MRI: Functional Recovery DE-MRI Pre-tx cine Post-tx cine 3 VD, F/U 3 months after CABG EF: 47.4% 63.4%
31 DE-MRI: Functional Recovery DE-MRI Pre-tx cine Post-tx cine 3 VD, F/U 3 months after CABG EF: 17.8% 19.4%
32 Assessment of Myocardial Salvage An animal study in 15 dogs 45 min Occlusion 90 min Occlusion Permanent Occlusion Hillenbrand et al. Circulation 2000
33 Assessment of Myocardial Salvage An animal study in 15 dogs Mean Trnasmural Extent of Hyperenhancement % Segment with Improved Wall Motion 34 % 12 % 34 % 12 % Mean Transmural Extent of Hyperenhancement on Day 3 in Each Group 0 1 ~ ~ ~ ~100 % Hyperenhancement on Day 3 Hillenbrand et al. Circulation 2000
34 Assessment of Myocardial Salvage A prospective study in 61 patients 10 % 1.7 % LAD LCX RCA Kim et al. N Engl J Med 2000
35 MRI for Myocardial Viability 1. Detection of Myocyte necrosis or scar: DE-MRI 2. Assessment of LV function: Myocardial mass: End-diastolic wall thickness LV contractility: End-systolic wall thickening Contractile (inotropic) reserve
36 2. LV Function: Cine MRI
37 Analysis of LV Function Visual qualitative assessment Quantitative assessment Thickness (ED) Thickening Motion
38 Quantitative Assessment More accurate than visual assessment 47/M Acute myocardial infarction Echo: normal wall motion
39 Real Time Cine MR Retrospective TFE Synchronized Real Time Multi Slice (M2D) B-TFE Free breathing, real time, no breathhold Pediatric patients, sick patients Breathhold retrospective btfe Free breathing real time cine
40 2. LV Function: Low Dose DSMR contractile (inotropic) reserve DE-MRI: impaired specificity as a predictor of functional recovery in non-transmural scars (1% to 74%). Low dose DSMR: superior to DE-MRI as a predictor of functional recovery and does not depend on the transmurality of scar. DE-MRI and DSMR provide complementary information. Wellnhofer et al, Circulation 2004
41 DSE vs DSMR Rest 10µg 20µg DSE DSMR
42 Low Dose DSMR Rest MRI Low dose DSMR
43 Low Dose DSMR Pre CABG Post CABG
44 Low Dose DSMR Viability Rest 10µg 20µg
45 2. LV Function: Tagged MRI Wall Motion Abnormality due to ICMP
46 Tagged MRI Radial thickening Circumferential shortening
47 Conclusion 1. Delayed enhancement MRI Detection of area with myocyte necrosis Acute MI vs. chronic MI (with T2 MRI) Prediction of functional recovery 2. Cine MRI / Tagged cine MRI / DSMR Myocardial mass Contractile function inotropic reserve
48 Thank You!! Tae-Hwan Lim, MD, PhD Department of Radiology, Asan Medical Center University of Ulsan College of Medicine Seoul, Korea
Sung A Chang Department of Internal Medicine, Division of Cardiology, Sungkyunkwan University School of Medicine, Samsung Medical Center
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