Respiratory abnormalities in sarcoidosis: physiopathology and early diagnosis using oscillometry combined with respiratory modeling

Table 2 Respiratory oscillometry data

	Control group (n = 25)	Sarcoidosis normal spirometry (n = 25)	Sarcoidosis altered spirometry (n = 25)	ANOVA
R4 (cmH₂O/L/s)	2.4 ± 0.7	3.1 ± 1.02	3.8 ± 1.33	< 0.0001
R20 (cmH₂O/L/s)	2.4 ± 0.6	2.9 ± 1.18	3.27 ± 1.33	< 0.05
R4-R20 (cmH₂O/L/s)	0.03 ± 0.2	0.18 ± 0.8	0.60 ± 0.69	< 0.001
Xm (cmH₂O/L/s)	0.14 ± 0.3	− 0.36 ± 1.6	− 0.89 ± 1.5	< 0.001
Fr (Hz)	13.2 ± 2.9	16.6 ± 5.54	22.11 ± 7.03	< 0.0001
Cdyn (mL/cmH₂O)	30.6 ± 21.0	17.8 ± 10.92	14.11 ± 8.4	< 0.001
Ax (cmH₂O/L/s²)	6.2 ± 4.1	19.5 ± 40.8	29.7 ± 40.9	< 0.0001
Z4 (cmH₂O/L/s)	3.09 ± 1.04	4.9 ± 4.4	6.27 ± 4.76	< 0.001

Legend: Resistance at 4 Hz (R4), Resistance at 20 Hz (R20), Resistance difference between 4 Hz and 20 Hz (R4-R20), Average reactance (Xm), Resonance frequency (Fr), Dynamic compliance of the respiratory system (Cdyn), Area under the reactance curve calculated by the integral (Ax) and Absolute value of the impedance of the respiratory system (Z4)

ISSN: 1471-2466