ECG characteristics of patients with amyloidosis fitted with ECGI (group 1) and the validation cohort (group 2)
| ATTR-CA, group 1 (n=20) | CA cohort, group 2 (n=30) | ||
| Heart rate, bpm (IQR) | 64 (56–77) | 73 (64–81) | |
| Rhythm, n (%) | Sinus rhythm | 10 (50) | 18 (60) |
| Atrial fibrillation | 6 (30) | 9 (29) | |
| Atrial flutter | 2 (10) | 1 (3) | |
| Pacemaker | 2 (10) | 2 (8) | |
| Low voltage*, n (%) | 4 (20) | 4 (12) | |
| AV block, n (%) | 7 (35) | 10 (32) | |
| PQ interval, ms (IQR) | 201 (190–228) | 196 (160–222) | |
| Intraventricular conduction delay, n (%) | LAFB | 6 (30) | 11 (38) |
| LBBB | 2 (10) | 6 (20) | |
| RBBB | 4 (20) | 8 (26) | |
| QRS interval, ms (IQR) | 100 (86–108) | 120 (95–156) | |
| QTc interval, ms (IQR) | 451 (427–477) | 473 (445–503) | |
Values are given as median and IQR, or total number (n) and %.
*Low voltage was defined by an amplitude <0.5 mV in limb leads or <0.75 mV in precordial leads.
ATTR-CA, transthyretin cardiac amyloidosis; AV, atrioventricular block; bpm, beats per minute; CA, cardiac amyloidosis; ECGI, electrocardiographic imaging; LAFB, left anterior fascicular block; LBBB, left bundle branch block; RBBB, right bundle branch block.