Table 2.

Changes in airway resistance and airway volume induced by a single intrapulmonary percussive ventilation treatment in 5 COPD patients with an acute exacerbation. Changes were calculated using computational fluid dynamics (CFD)

	Δ iRaw total (%)	Δ iRaw central (%)	Δ iRaw distal (%)	Δ airway volume total (%)	Δ airway volume central (%)	Δ airway volume distal (%)
P1	20.03	−23.72	33.13	4.05	4.23	3.38
P2	−9.61	4.80	−13.14	3.80	3.86	3.62
P3	−9.83	4.29	−12.24	2.15	0.85	10.85
P4	2.65	−1.21	3.69	−1.66	−1.77	−1.41
P5	31.65	7.35	55.36	−2.91	−0.22	−12.25
Mean (SD)	6.98 (±18.41)	−1.70 (±12.70)	13.36 (±30.03)	1.09 (±3.19)	1.39 (±2.60)	0.838 (±8.53)

Notes: Central airways are defined as trachea and main bronchea. Distal airways are defined as smaller airways defined for each lobe.

Abbreviations: Δ iRaw total, changes in airway resistance for the total model; Δ iRaw central, changes in airway resistance for the central airway model; Δ iRaw distal, changes in airway resistance for the distal airway model; Δ airway volume total, changes in airway volume for the total model; Δ airway volume central, changes in airway volume for the central airway model; Δ airway volume distal, changes in airway resistance for the distal airway model; P1-P5, patients 1 to 5 mean values for each parameter; SD, standard deviation.