Feasibility of Bioelectrical Impedance Spectroscopy Measurement before and after Thoracentesis
Table 4
Bioelectrical impedance results before and after thoracentesis (95% CI).
Vector
Parameters
Thoracic impedance
Before thoracentesis
After thoracentesis
Control
value*
value**
value***
[Ω]
397 (316–478)
430 (339–520)
422 (398–446)
0.133
0.185
0.301
[Ω]
1770 (1303–2236)
1783 (1378–2187)
697 (600–793)
0.536
<0.001
<0.001
[Ω]
472 (411–533)
502 (437–567)
532 (499–565)
0.055
0.1
0.375
[Ω]
1742 (1338–2146)
1699 (1277–2121)
835 (748–922)
0.823
<0.001
0.001
[Ω]
437 (369–505)
477 (402–552)
512 (483–541)
0.021
0.076
0.529
[Ω]
1670 (1323–2018)
1636 (1272–2001)
765 (696–835)
0.996
<0.001
<0.001
[Ω]
34.46 (29.08–39.84)
38.28 (31.85–44.71)
65.18 (59.8–70.56)
0.001
<0.001
<0.001
[Ω]
60.57 (47.64–73.5)
62.11 (49.12–75.09)
69.21 (56.12–82.29)
0.705
0.331
0.382
value between before and after thoracentesis. ** value between before thoracentesis and control group. *** value between after thoracentesis and control group. : “Foot to Foot” vector, : “Hand to Hand” vector, : “Foot to Hand” vector, : “Transthoracic” vector, : extrapolated resistance of the low frequency to “0” as resistance of extracellular space, and : extrapolated resistance of the high frequency to infinite as resistance of intracellular space.
