Association of ECG parameters with late gadolinium enhancement and outcome in patients with clinical suspicion of acute or subacute myocarditis referred for CMR imaging

Kady Fischer, Maximilian Marggraf, Anselm W Stark, Kyoichi Kaneko, Ayaz Aghayev, Dominik P Guensch, Adrian T Huber, Michael Steigner, Ron Blankstein, Tobias Reichlin, Stephan Windecker, Raymond Y Kwong, Christoph Gräni, Kady Fischer, Maximilian Marggraf, Anselm W Stark, Kyoichi Kaneko, Ayaz Aghayev, Dominik P Guensch, Adrian T Huber, Michael Steigner, Ron Blankstein, Tobias Reichlin, Stephan Windecker, Raymond Y Kwong, Christoph Gräni

Abstract

Background: Risk stratification of myocarditis is challenging due to variable clinical presentations. Cardiovascular magnetic resonance (CMR) is the primary non-invasive imaging modality to investigate myocarditis while electrocardiograms (ECG) are routinely included in the clinical work-up. The association of ECG parameters with CMR tissue characterisation and their prognostic value were investigated in patients with clinically suspected myocarditis.

Methods and results: Consecutive patients with suspected myocarditis who underwent CMR and ECG were analysed. Major adverse cardiovascular event (MACE) included all-cause death, hospitalisation for heart failure, heart transplantation, documented sustained ventricular arrhythmia, or recurrent myocarditis. A total of 587 patients were followed for a median of 3.9 years. A wide QRS-T angle, low voltage and fragmented QRS were significantly associated with late gadolinium enhancement. Further, a wide QRS-T angle, low voltage and prolonged QTc duration were associated with MACE in the univariable analysis. In a multivariable model, late gadolinium enhancement (HR: 1.90, 95%CI: 1.17-3.10; p = 0.010) and the ECG parameters of a low QRS voltage (HR: 1.86, 95%CI: 1.01-3.42; p = 0.046) and QRS-T-angle (HR: 1.01, 95%CI: 1.00-1.01; p = 0.029) remained independently associated with outcome. The cumulative incidence of MACE was incrementally higher when findings of both CMR and ECG were abnormal (p<0.001).

Conclusion: In patients with clinically suspected myocarditis, abnormal ECG parameters are associated with abnormal tissue characteristics detected by CMR. Further, ECG and CMR findings have independent prognostic implications for morbidity and mortality. Integrating both exams into clinical decision-making may play a role in risk stratification in this heterogeneous patient population.

Conflict of interest statement

I have read the journal's policy and the authors of this manuscript have the following competing interests: Dr. Gräni receives funding support from the Novartis Foundation for Medical-Biological Research, Bangerter-Rhyner Foundation, Swiss Sports Medicine Society (SGSM) and Kreislauf Kardiologie Foundation. Dr. Kwong receives research support from NIH awards 1UH2 TR000901, 1RO1DK083424-01, and 1U01HL117006, Alnylam Pharmaceuticals, and the Society for the Cardiovascular Magnetic Resonance. The authors declare that they have no other conflict of interest. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Figures

Fig 1. Patient enrolment.
Fig 1. Patient enrolment.
A total of 744 patients were referred to cardiovascular magnetic resonance for suspected myocarditis with 587 patients included in the final analysis.
Fig 2. Relationship between ECG and CMR…
Fig 2. Relationship between ECG and CMR parameters and their association with MACE.
Brown connecting lines indicate significant associations (p

Fig 3. Cumulative incidence of MACE.

Kaplan…

Fig 3. Cumulative incidence of MACE.

Kaplan Meier curve of cumulative incidence, based on the…

Fig 3. Cumulative incidence of MACE.
Kaplan Meier curve of cumulative incidence, based on the presence of late gadolinium enhancement (LGE) and an abnormal electrocardiogram (ECG) marker of either fragmented QRS, wide QRS-T angle, prolonged QTc duration or low QRS voltage.

Fig 4. Patient with sustained ventricular tachycardia.

Fig 4. Patient with sustained ventricular tachycardia.

This is a case of a 62 year…

Fig 4. Patient with sustained ventricular tachycardia.
This is a case of a 62 year old male who experienced sustained ventricular tachycardia 4 months following the CMR exam, followed by death after 3.0 years. LGE Images (A-C) show a midwall distribution and linear pattern in the long-axis view (A), of which the extent of LGE was 11.0% highlighted yellow in the short-axis view (B). A bullseye plot representing the full left ventricle, shows the relative enhancement (yellow and black) afflicted all ventricular walls. The ECV map (D) demonstrated a similar pattern with a global ECV of 39.8% (red), while some oedema in the lateral wall (blue) was detected in the T2w images (E). At the CMR exam, left ventricular ejection fraction was 40%. A wide QRS-T angle was detected in the ECG. ECV: Extracellular Volume, fQRS: Fragmented QRS, LGE: Late Gadolinium Enhancement, T2w: T2 Weighted.
Fig 3. Cumulative incidence of MACE.
Fig 3. Cumulative incidence of MACE.
Kaplan Meier curve of cumulative incidence, based on the presence of late gadolinium enhancement (LGE) and an abnormal electrocardiogram (ECG) marker of either fragmented QRS, wide QRS-T angle, prolonged QTc duration or low QRS voltage.
Fig 4. Patient with sustained ventricular tachycardia.
Fig 4. Patient with sustained ventricular tachycardia.
This is a case of a 62 year old male who experienced sustained ventricular tachycardia 4 months following the CMR exam, followed by death after 3.0 years. LGE Images (A-C) show a midwall distribution and linear pattern in the long-axis view (A), of which the extent of LGE was 11.0% highlighted yellow in the short-axis view (B). A bullseye plot representing the full left ventricle, shows the relative enhancement (yellow and black) afflicted all ventricular walls. The ECV map (D) demonstrated a similar pattern with a global ECV of 39.8% (red), while some oedema in the lateral wall (blue) was detected in the T2w images (E). At the CMR exam, left ventricular ejection fraction was 40%. A wide QRS-T angle was detected in the ECG. ECV: Extracellular Volume, fQRS: Fragmented QRS, LGE: Late Gadolinium Enhancement, T2w: T2 Weighted.

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