Observational Study
Copyright ©The Author(s) 2021.
World J Clin Cases. Jul 26, 2021; 9(21): 5889-5899
Published online Jul 26, 2021. doi: 10.12998/wjcc.v9.i21.5889
Table 1 Clinical characteristics of patients included in our study
Characteristics
Value
n 45
Male28 (62)
Age (yr)38 (21, 59)
Weight (kg)63 (60, 70)
Height (cm)16 (163, 175)
Etiology for pneumothorax
Spontaneous pneumothorax16 (36)
Trauma29 (64)
Pneumothorax features
Left18 (40)
Right27 (60)
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/CVmax1.06 (0.85, 1.53)4.93 (3.40, 7.52)< 0.001
PSmax/CSmax0.76 (0.32, 1.05)1.74 (1.30, 2.66)< 0.001
Table 3 The diagnostic performance of measurements obtained by tissue Doppler imaging in the diagnosis of pneumothorax

AUC
P value
Cut-off value
Sensitivity
Specificity
PLR
NLR
PPV
NPV
PVmax (cm/s)0.84 (0.75, 0.92)< 0.0010.5096%62%2.530.070.720.93
PSmax (%)0.72 (0.62, 0.83)< 0.0010.9447%91%5.250.840.840.63
PVmax/CVmax0.99 (0.96, 1.00)< 0.0011.9693%96%21.000.070.950.93
PSmax/CSmax0.91 (0.84, 0.97)< 0.0011.1282%93%12.330.190.930.84
Table 4 Variability of tissue Doppler imaging measurements

PVmax
CVmax
PSmax
CSmax
Senior physician
Pneumothorax0.87 (0.78, 0.93)0.85 (0.73, 0.91)0.84 (0.72, 0.91)0.88 (0.79, 0.93)
Non-pneumothorax0.88 (0.79, 0.93)0.82 (0.59, 0.92)0.85 (0.75, 0.92)0.86 (0.77, 0.92)
Resident
Pneumothorax0.75 (0.59, 0.87)0.67 (0.47, 0.81)0.64 (0.43, 0.79)0.72 (0.48, 0.85)
Non-pneumothorax0.79 (0.64, 0.88)0.75 (0.48, 0.87)0.72 (0.54, 0.84)0.75 (0.59, 0.86)
Total
Pneumothorax0.77 (0.65, 0.85)0.73 (0.60, 0.83)0.68 (0.54, 0.80)0.80 (0.69, 0.89)
Non-pneumothorax0.80 (0.69, 0.87)0.75 (0.62, 0.85)0.76 (0.64, 0.85)0.74 (0.62, 0.84)