Intra- and Inter-observer Variability
The intra- and inter-observer variability were calculated as the
intraclass correlation coefficient (ICC) for measures of PALS and PACS
in 2- and 4-chamber views across 8 randomly selected patients.
Intra-observer variability was calculated based on repeated LA strain
measures by the same echocardiographer blinded to prior measurements,
and interobserver variability was performed by a second
echocardiographer blinded to prior measurements.