Abstract
Ischemic mitral regurgitation (iMR) augments risk for right ventricular dysfunction (RVDYS). Right and left ventricular (LV) function are linked via common coronary perfusion, but data is lacking regarding impact of LV ischemia and infarct transmurality—as well as altered preload and afterload—on RV performance. In this prospective multimodality imaging study, stress CMR and 3-dimensional echo (3D-echo) were performed concomitantly in patients with iMR. CMR provided a reference for RVDYS (RVEF < 50%), as well as LV function/remodeling, ischemia and infarction. Echo was used to test multiple RV performance indices, including linear (TAPSE, S′), strain (GLS), and volumetric (3D-echo) approaches. 90 iMR patients were studied; 32% had RVDYS. RVDYS patients had greater iMR, lower LVEF, larger global ischemic burden and inferior infarct size (all p < 0.05). Regarding injury pattern, RVDYS was associated with LV inferior ischemia and infarction (both p < 0.05); 80% of affected patients had substantial viable myocardium (< 50% infarct thickness) in ischemic inferior segments. Regarding RV function, CMR RVEF similarly correlated with 3D-echo and GLS (r = 0.81–0.87): GLS yielded high overall performance for CMR-evidenced RVDYS (AUC: 0.94), nearly equivalent to that of 3D-echo (AUC: 0.95). In multivariable regression, GLS was independently associated with RV volumetric dilation on CMR (OR − 0.90 [CI − 1.19 to − 0.61], p < 0.001) and 3D echo (OR − 0.43 [CI − 0.84 to − 0.02], p = 0.04). Among patients with iMR, RVDYS is associated with potentially reversible processes, including LV inferior ischemic but predominantly viable myocardium and strongly impacted by volumetric loading conditions.
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Abbreviations
- ASE:
-
American Society of Echocardiography
- CAD:
-
Coronary artery disease
- CI:
-
Confidence interval
- CMR:
-
Cardiac magnetic resonance
- Echo:
-
Echocardiography
- ESV:
-
End-systolic volume
- EDV:
-
End-diastolic volume
- EF:
-
Ejection fraction
- GLS:
-
Global longitudinal strain
- iMR:
-
Ischemic mitral regurgitation
- LV:
-
Left ventricle
- MI:
-
Myocardial infarction
- MR:
-
Mitral regurgitation
- NYHA:
-
New York Heart Association
- PA:
-
Pulmonary artery
- PH:
-
Pulmonary hypertension
- ROC:
-
Receiver operating characteristics
- RV:
-
Right ventricle
- RVDYS :
-
Right ventricular dysfunction
- S′:
-
Systolic excursion velocity
- SPECT:
-
Single-photon emission computed tomography
- TAPSE:
-
Tricuspid annular plane systolic excursion
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Acknowledgements
This study was supported by National Institutes of Health (Grant Nos. 1K23 HL140092-01 and 1R01HL128278-01).
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Kim, J., Alakbarli, J., Yum, B. et al. Tissue-based markers of right ventricular dysfunction in ischemic mitral regurgitation assessed via stress cardiac magnetic resonance and three-dimensional echocardiography. Int J Cardiovasc Imaging 35, 683–693 (2019). https://doi.org/10.1007/s10554-018-1500-4
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DOI: https://doi.org/10.1007/s10554-018-1500-4