Methods
The 58 patients with frequent PVCs and 53 healthy volunteers as a
control group were enrolled in the study. Imaging was performed using
the GE Vivid E95 echocardiography equipment (GE Healthcare; Vingmed
Ultrasound, Horten, Norway) equipped with an M5S probe (frequency range:
1.5–4.6 MHz) and a 4V probe (frequency range: 1.5–4.0 MHz). Images
were imported into and were selected for analysis using the EchoPAC203
software (GE Healthcare). The analysis mode was selected, followed by
the volume and 4D Auto LAQ submodes. Following that, the sample point
was positioned in the center of the mitral orifice in each of the three
planes. The review function was used to acquire the LA parameters
measured by 4D Auto LAQ, including volume and strain parameters.