Skip to main content
Fig. 2 | BMC Pulmonary Medicine

Fig. 2

From: Evaluation of continuous constant current and continuous pulsed current in sweat induction for cystic fibrosis diagnosis

Fig. 2

The comparison between continuous constant current (CCC) and sinusoidal pulsed current (SPC) and triangular pulsed current (TPC) for electrical impedance and sweat weight showed: (i) TPC presented higher electrical impedance values when compared with SPC and CCC; (ii) SPC presented lower electrical impedance and higher sweat weight when compared with CCC. a Arm site where induction was performed using CCC and continuous pulsed current. b Comparison between SPC and TPC for electrical impedance. (SPC) N = 54; 6.14 ± 2.08; 6.23 (2.12 to 11.05); 5.57 to 6.71; (TPC) N = 201; 7.94 ± 3.16; 7.82 (1.94 to 17.76); 7.5 to 8.38. c Comparison between CCC and TPC for electrical impedance. (CCC) N = 197; 8.9 ± 4.8; 8.15 (1.12 to 38.33); 8.23 to 9.60; (TPC) N = 197; 7.97 ± 3.2; 7.83 (1.94 to 17.76); 7.52 to 8.41. d Comparison between CCC and SPC for electrical impedance. (CCC) N = 54; 7.29 ± 2.98; 6.76 (2.95 to 17.11); 6.47 to 8.1; (SPC) N = 54; 6.14 ± 2.08; 6.23 (2.12 to 11.05); 5.57 to 6.71. e Comparison between CCC and SPC for sweat weight. (CCC) N = 55; 146 ± 46.1; 141 (50 to 234); 133.3 to 158.8; (SPC) N = 55; 179 ± 70.2; 176 (46 to 433); 159.7 to 197.1. All p-values were below 0.001. Data are presented as: number of individuals; mean ± standard deviation; median (minimum to maximum); confidence interval for the mean value. Statistical analysis conducted through Wilcoxon signed-rank test and Mann-Whitney U test of independent samples. Alpha = 0.05. The currents are shown as Ω using the following equation: [Z = VRMS / IRMS (Ω)]; Z = composite impedance (Ω); VRMS = effective voltage measured (volts root mean square); IRMS = effective current measured (current root mean square). Also, the sweat weight is shown as milligrams. Only the associations with p-value < 0.05 was presented as figure

Back to article page