Abstract
Cardiac magnetic resonance (CMR) can provide a multi-parametric evaluation of left atrial (LA) size and function. A complete CMR-based LA assessment might improve the risk stratification of patients with non-ischemic dilated cardiomyopathy (DCM). We performed a comprehensive CMR-based evaluation of LA size and function, in order to assess the prognostic impact of specific LA parameters in DCM. Secondary analysis of a prospective registry (UHSM-CMR study, NCT02326324) including 648 consecutive patients with DCM and CMR evaluation of LA area and LA length. Of these, 456 had complete LA assessment covering reservoir, conduit and booster pump function and including LA reservoir strain evaluated with feature tracking. The heart failure (HF) endpoint included HF hospitalizations, HF death and heart transplant. The arrhythmic endpoint included ventricular arrhythmias (VA) (sustained or treated by implantable defibrillator) and sudden death (SD). At median follow-up of 23 months, 34 patients reached the HF endpoint; in a multivariable model including NYHA class and LVEF, LA length had incremental predictive value. LA length ≥ 69 mm was the best cut-off to predict HF events (adjusted HR 2.3, p = 0.03). Among the 456 patients with comprehensive LA assessment, only LA length was independently associated with the HF endpoint after adjusting for LVEF and NYHA class. By contrast, no LA parameter independently predicted the arrhythmic risk. In DCM patients, LA length is an independent predictor of HF events, showing stronger association than other more complex parameters of LA function. No atrial parameter predicts the risk of VA and SD.
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Data Availability
The dataset is contained within the UHSM-redCAP database as part of the UHSM-CMR study. The datasets used and/or analysed during the current study may be available from the corresponding author on reasonable request.
Abbreviations
- AF:
-
atrial fibrillation
- AIC:
-
Akaike information criterion
- CMR(i):
-
cardiac magnetic resonance (imaging)
- DCM:
-
dilated cardiomyopathy
- ECV:
-
extracellular volume
- EF:
-
ejection fraction
- EPR:
-
electronic patient records
- FT:
-
feature tracking
- HF:
-
heart failure
- HFH:
-
heart failure hospitalisation
- ICD:
-
implantable cardioverter defibrillator
- LA:
-
left atrium
- LGE:
-
late gadolinium enhancement
- LV:
-
left ventricle
- ROC:
-
receiver operator curves
- SAE:
-
significant arrhythmic event
- SD:
-
sudden death
- SSFP:
-
steady state free precession
- VA:
-
ventricular arrhythmia
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Funding
Dr Brown was in receipt of a joint Alliance Medical + UHSM Fellowship Salary support grant. Drs Miller and Schmitt received a restricted grant by Guerbet in support of the UHSM CMR study (NCT02326324).
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PB/AdiM/MS conceived, wrote and revised the manuscript. PB/ZT/JB/AR contributed to data collection. AdiM conducted statistical analysis. AdiM/MS/CM/GN supervised the project. All authors reviewed and approved the final manuscript.
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Participants were recruited from the UHSM-CMR Study, National Clinical Trials number 02326324, and received appropriate ethical approval (IRAS id is: 159694 and REC reference: 14/NW/1165). All patients gave written, informed consent for participation.
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Brown, P.F., Di Marco, A., Tsoumani, Z. et al. Predictive value of a comprehensive atrial assessment with cardiac magnetic resonance in non-ischemic cardiomyopathy: keep it simple. Int J Cardiovasc Imaging 40, 557–567 (2024). https://doi.org/10.1007/s10554-023-03024-4
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DOI: https://doi.org/10.1007/s10554-023-03024-4