title: Usefulness of left ventricular dyssynchrony after acute myocardial infarction, assessed by a tagging magnetic resonance image derived metric, as a determinant of ventricular remodeling.
abstract: Development of left ventricular (LV) remodeling after acute myocardial infarction (AMI) is a serious medical complication. We investigated the correlation of LV dyssynchrony after AMI with LV remodeling using magnetic resonance-myocardial tagging (MR-MT) derived dyssynchrony index (circumferential uniformity ratio estimate [CURE]). Forty-three patients diagnosed with ST-elevation AMI were analyzed. After treatment with primary percutaneous intervention, cardiac magnetic resonance imaging was performed to obtain a cine image, a delayed enhancement image, and an MR-MT image. CURE as a dyssynchrony index was calculated from the MR-MT image using HARP software (CURE 0 to 1 = dyssynchrony to synchrony). After 6 months, follow-up cardiac magnetic resonance imaging was performed to assess degree of LV remodeling. Sixteen patients (37%) had an increased LV end-systolic volume (ESV) >15% compared with baseline. The baseline LV dyssynchrony index, CURE, was significantly associated with ESV at 6 months (r = -0.49, p <0.001) and weakly correlated with change in ESV (percentage) compared with baseline values (r = -0.26, p = 0.08). Multivariate analysis showed that CURE was associated only with change in ESV (beta -0.39, p = 0.03). Subgroup analysis for patients with nonviable myocardium (infarct thickness >75%, n = 31) showed that this correlation was stronger (beta -0.52, p = 0.006), suggesting that CURE could predict progression of LV remodeling in patients with AMI and nonviable myocardium. LV dyssynchrony immediately after AMI is an important determinant of LV remodeling. In conclusion, the MR-MT dyssynchrony index, CURE, might be useful for prediction of LV remodeling in patients with AMI.
authors: Division of Cardiology, Cardiovascular Center, Seoul National University, Bundang Hospital, Gyeonggi-Do, Korea.
authors: Sung-A
authors: SA
authors: Chang
authors: Hyuk-Jae
authors: HJ
authors: Chang
authors: Sang Il
authors: SI
authors: Choi
authors: Eun Ju
authors: EJ
authors: Chun
authors: Yeonyee E
authors: YE
authors: Yoon
authors: Hyung-Kwan
authors: HK
authors: Kim
authors: Yong-Jin
authors: YJ
authors: Kim
authors: Dong-Ju
authors: DJ
authors: Choi
authors: Dae-Won
authors: DW
authors: Sohn
authors: Robert H
authors: RH
authors: Helm
authors: Albert C
authors: AC
authors: Lardo
mesh_terms: D000208:Acute Disease; D015906:Angioplasty, Balloon, Coronary; D047228:Angiotensin II Type 1 Receptor Blockers / Q000627:therapeutic use; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000627:therapeutic use; D001145:Arrhythmias, Cardiac / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D005260:Female; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009203:Myocardial Infarction / Q000473:pathology / Q000503:physiopathology / Q000628:therapy*; D011446:Prospective Studies; D013223:Statistics as Topic; D018487:Ventricular Dysfunction, Left / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D020257:Ventricular Remodeling
chemical_list: D047228:Angiotensin II Type 1 Receptor Blockers; D000806:Angiotensin-Converting Enzyme Inhibitors