. 2017 Feb 10;13(4):1572–1577. doi: 10.3892/etm.2017.4117

Table I.

Respiration parameters of the acute respiratory distress syndrome swine model under different conditions (mean ± standard deviation).

Parameter	Pre-injury	Injury	Po-4	Po-2	Po	Po+2	Po+4
VD/VT	0.35±0.11	0.68±0.10^a	0.60±0.07^a,b	0.52±0.11^a,b	0.44±0.08^a,b	0.61±0.08^a	0.64±0.10^a
PaCO₂ (mmHg)	34.80±6.73	43.81±8.02^a	47.73±10.33^a	49.05±12.47^a	49.19±11.82^a	47.71±12.28^a	47.62±12.89^a
SaO₂ (%)	99.86±0.05	88.40±11.25^a	96.79±1.52^b	98.58±0.48^b	98.75±2.55^b	97.78±0.96^b	96.34±2.50^b
Qs/Qt (%)	1.88±1.14	21.06±15.62^a	7.50±4.14^a,b	5.01±1.53^b	2.77±2.53^b	6.68±2.86^b	9.55±5.85^a,b
P/F (mmHg)	562±162	75±21^a	166±109^a	291±62^a,b	342±144^a,b	365±133^a,b	294±170^a,b
Cdyn (ml/cm H₂O)	38.17±6.97	15.17±5.37^a	17.83±3.81^a	18.00±4.97^a	20.67±5.58^a,b	19.33±4.44^a,b	17.50±3.34^a

P<0.05 vs. pre-injury

P<0.05 vs. injury. VD/VT, dead space volume/tidal volume (dead space fraction); PaCO₂, alveolar partial pressure of carbon dioxide; SaO₂, arterial oxygen saturation; Qs/Qt, intrapulmonary shunt fraction; P/F, alveolar partial pressure of oxygen/fraction of inspiration oxygen (oxygenation index); Cdyn, dynamic tidal respiratory compliance; Po, optimal positive end-expiratory pressure; -n, n cm Hg below Po; +n; n cm Hg above Po.