The influence of left bundle branch block on myocardial T1 mapping.

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ID: 278726
2024
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Abstract
Tissue characterisation using T1 mapping has become an established magnetic resonance imaging (MRI) technique to detect myocardial diseases. This retrospective study aimed to determine the influence of left bundle branch block (LBBB) on T1 mapping at 1.5 T. Datasets of 36 patients with LBBB and 27 healthy controls with T1 mapping (Modified Look-Locker inversion-recovery (MOLLI), 5(3)3 sampling) were included. T1 relaxation times were determined on mid-cavity short-axis images. R maps were generated as a pixel-wise indicator for the goodness of the fit of T1 maps. R values were significantly lower in patients with LBBB than in healthy controls (whole myocardium/septum, 0.997, IQR, 0.00 vs. 0.998, IQR, 0.00; p = 0.008/0.998, IQR, 0.00 vs. 0.999, IQR, 0.00; p = 0.027). Manual correction of semi-automated evaluation tended to improve R values but not significantly. Strain analysis was performed and the systolic dyssynchrony index (SDI) was calculated as a measure for left ventricular dyssynchrony. While MRI is generally prone to artefacts, lower goodness of the fit in LBBB may be mainly attributable to asynchronous contraction. Therefore, careful checking of the source data and, if necessary, manual post-processing is important. New techniques might improve the goodness of the fit of T1 mapping by reducing sampling in the motion prone diastole of LBBB patients.
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Authors Petersen, Antonia;Nagel, Sebastian Niko;Hamm, Bernd;Elgeti, Thomas;Schaafs, Lars-Arne;
Journal Scientific reports
Year 2024
DOI
5379
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Keywords
health care worker seroepidemiologic studies covid-19 sars-cov-2 nosocomial transmission outbreak report

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