Quantification analysis of pleural line movement for the diagnosis of pneumothorax

Table 2 Comparison of measurements obtained by tissue Doppler imaging between the pneumothorax and non-pneumothorax sides

	Pneumothorax side, n = 45	Non-pneumothorax side, n = 45	P value
PVmax (cm/s)	0.36 (0.23, 0.41)	0.59 (0.38, 0.80)	< 0.001
PSmax (%)	1.14 (0.41, 1.85)	1.90 (1.30, 3.34)	0.001
CVmax (cm/s)	0.30 (0.15, 0.39)	0.13 (0.09, 0.19)	< 0.001
CSmax (%)	1.62 (1.16, 2.06)	1.00 (0.71, 1.98)	0.075
PVmax/CVmax	1.06 (0.85, 1.53)	4.93 (3.40, 7.52)	< 0.001
PSmax/CSmax	0.76 (0.32, 1.05)	1.74 (1.30, 2.66)	< 0.001

Data are expressed as the median and interquartile range. PV_max: Peak pleural line velocity; CV_max: Peak chest wall tissue velocity; PS_max: Peak pleural line strain value; CS_max: Peak chest wall tissue strain value.