Table 2.
Description of variables analysed from cardiac MRI and electroanatomical mapping
| CMR variables | Frequency (proportion) | EAM variables | Frequency (proportion) |
|---|---|---|---|
| Mean LV EDVi | 93.3±26.3 | Mean number of data points | 1046.7±897.1 |
| Mean LV ESVi | 60±28.4 | Mean LV surface area, sq.cm | 143.9±41.8 |
| Mean LV mass, grams | 151.7±69.3 | Map density, per sq.cm | 8.7±8.9 |
| Peak global circumferential strain, % | −11.8±4.5 | Mean bipolar voltage, mV | 2.9±0.2 |
| Peak global radial strain, % | +22.4±8.7 | Mean unipolar voltage, mV | 10.3±0.6 |
| Peak global longitudinal strain, % | −11.2±3.8 | Mean % area of bipolar LVZ | 29.0±22.1 |
| Mean, % segmental abnormality (CS) | 75.3±20.0 | Mean % area of unipolar LVZ | 37.5±21.5 |
| Mean % segmental abnormality (LS) | 70.0±15.9 |
Location of bipolar/ unipolar LVZ (in order of frequency) |
|
| Mean % segmental abnormality (CS + LS) | 54.3±20.4 | Basal anteroseptal | 12 (63%) |
| LGE-scar | 12 (63%) | Basal inferolateral | 10 (53%) |
| Focal LGE-scar | 9 (75%) | Basal inferoseptal | 9 (47%) |
| Multifocal LGE-scar | 3 (25%) | Basal anterolateral | 8 (42%) |
| Endocardial/ Mid-myocardial/ Epicardial/ Transmural LGE-scar | 1 (8%)/ 6 (50%)/ 3 (25%)/ 2 (17%) | Mid anterior | 6 (32%) |
| Septal/ Free wall/ Combined | 8 (67%)/3 (25%)/1 (8%) | Basal anterior | 5 (26%) |
| Mean scar mass, grams | 9.3±8.3 | Basal inferior | 4 (21%) |
| Mean scar volume, ml | 8.9±7.9 | Mid anteroseptal | 4 (21%) |
| Mean % LGE-scar area | 4.0±3.9 | ||
Values are mean ± SD or n (%)
Abbreviations: SD, standard deviation; CMR, cardiac magnetic resonance imaging; EAM, electroanatomical mapping; LV, left ventricle; CS, circumferential strain; LS, longitudinal strain; LGE, late gadolinium enhancement; bipolar LVZ, low voltage zone <1.5 mV; unipolar LVZ, low voltage zone <8.3 mV