Electrocardiographic Impact of Myocardial Diffuse Fibrosis and Scar: MESA (Multi-Ethnic Study of Atherosclerosis)
Year: 2016
Type: article
Study design: Observational Study
Abstract: Purpose To examine the associations of myocardial diffuse fibrosis and scar with surface electrocardiographic (ECG) parameters in individuals free of prior coronary heart disease in four different ethnicities. Materials and Methods This prospective cross-sectional study was approved by the institutional review boards, and all participants gave informed consent. A total of 1669 participants in the Multi-Ethnic Study of Atherosclerosis, or MESA, who were free of prior myocardial infarction underwent both ECG and cardiac magnetic resonance imaging. In individuals without a late gadolinium enhancement–defined myocardial scar (n = 1131), T1 mapping was used to assess left ventricular (LV) interstitial diffuse fibrosis. The associations of LV diffuse fibrosis or myocardial scar with ECG parameters (QRS voltage, QRS duration, and corrected QT interval [QTc]) were evaluated by using multivariable regression analyses adjusted for demographic data, risk factors for scar, LV end-diastolic volume, and LV mass. Results The mean age of the 1669 participants was 67.4 years ± 8.7 (standard deviation); 49.8% were women. Lower postcontrast T1 time at 12 minutes was significantly associated with lower QRS Sokolow-Lyon voltage (β = 15.1 µV/10 msec, P = .004), lower QRS Cornell voltage (β = 9.2 µV/10 msec, P = .031), and shorter QRS duration (β = 0.16 msec/10 msec, P = .049). Greater extracellular volume (ECV) fraction was also significantly associated with lower QRS Sokolow-Lyon voltage (β = −35.2 µV/1% ECV increase, P < .001) and Cornell voltage (β = −23.7 µV/1% ECV increase, P < .001), independent of LV structural indexes. In contrast, the presence of LV scar (n = 106) was associated with longer QTc (β = 4.3 msec, P = .031). Conclusion In older adults without prior coronary heart disease, underlying greater LV diffuse fibrosis is associated with lower QRS voltage and shorter QRS duration at surface ECG, whereas clinically unrecognized myocardial scar is associated with a longer QT interval. © RSNA, 2016 Online supplemental material is available for this article.
Source: Radiology
Language: English
Subfield: Radiology, Nuclear Medicine and Imaging
Field: Medicine
Domain: Health Sciences
Open Access status: green
Awards: G1261793039, MESA, G1276754516, G1409423729, G1640378483, G1686417863, G2144938473, G22458031, G2262782284, MESA, MESA, G2837638605, G290884426, G291913881, SUBCLINICAL CARDIOVASCULAR DISEASE STUDY--EBCT READING, G3647016462, G3687594596, MESA, G399481048, TITLE: MULTI-ETHNIC STUDY OF ATHEROSCLEROSIS (MESA), G4512137732, OPTION 3. 4/1/2014 - 3/31/2015. MULTI-ETHNIC STUDY OF ATHEROSCLEROSIS (MESA) - READING CENTER, NHLBI, MESA, SUBCLINICAL CARDIOVASCULAR DISEASE STUDY-ULTRASOUND, G5787256936, G6095866717, G6359107525, Institute for Clinical and Translational Research, MESA, G6514094751, G66341962, MESA, G78770644, Clinical and Translational Science Award, G991334795
OpenAlex ID: W2530223406