Table 3.
Hand-held ultrasound operator | Reference echocardiography | |||
GP (novice) | RCN (intermediate) | Cardiologist (expert) | ||
Mean and agreement, autoEF (all recordings) | ||||
Mean (SD), %* | 51.7 (10.1) | 52.9 (9.6) | 53.3 (9.5) | 53.4 (10.1) |
Coefficient of variation, % | 15.4 | 13.3 | 12.0 | – |
Coefficient of repeatability, %* | 24.0 | 24.2 | 21.5 | – |
Mean and agreement, autoEF (first software version, n=107) | ||||
Mean (SD), %* | 52.6 (11.6) | 54.2 (10.3) | 55.0 (10.4) | 53.5 (10.0) |
Coefficient of variation, % | 14.8 | 13.5 | 11.2 | – |
Coefficient of repeatability, %* | 24.7 | 24.6 | 21.4 | – |
Mean and agreement, autoEF (revised software version, n=63) | ||||
Mean (SD), %* | 50.8 (8.4) | 51.0 (8.3) | 51.6 (8.1) | 54.7 (9.6) |
Coefficient of variation, % | 16.0 | 13.1 | 12.9 | – |
Coefficient of repeatability, %* | 20.6 | 20.6 | 19.8 | – |
Mean and agreement, autoMAPSE (all patients) | ||||
Mean of septal and lateral position | ||||
Mean (SD), mm | 9.8 (2.4) | 10.1 (2.6) | 10.2 (2.5) | 11.4 (2.9) |
Coefficient of variation, % | 24.3 | 20.5 | 18.9 | – |
Coefficient of repeatability, mm | 5.0 | 4.8 | 4.1 | – |
Comprehensive echocardiography by experienced cardiologists used as reference.
*% points.
AutoEF, automatic measurement of left ventricular ejection fraction; AutoMAPSE, automatic measurement of mitral annular plane systolic excursion; GP, general practitioner; RCN, registered cardiac nurse.