[Study of diagnostic criteria of acute respiratory distress syndrome and multiple organ dysfunction syndrome at high altitude: revised draft of the diagnostic criteria of high acute respiratory distress syndrome drawn in Lanzhou conference].
OBJECTIVE
To compare the difference of the diagnostic parameters of acute respiratory distress syndrome/multiple organ dysfunction syndrome (ARDS/MODS) at high altitude (H-ARDS/MODS) with that on plains and reevaluate the practicality and feasibility of the diagnostic criteria of H-ARDS (Lanzhou conference, 1999).


METHODS
Three hundred and sixty cases with relatively complete data were divided into three groups according to their originating altitude: control group on plains (CG, n=93), high altitude group 1 at the altitude of 1,517 m (H1G, n=223), high altitude group 2 at the altitude of 2,261-2,400 m (H2G, n=44). The ARDS/MODS scorings of the three groups were carried out according to the diagnostic criteria of Lushan Conference, Marshall (1995) and Lanzhou criteria drafted by the authors and the receiver operating characteristic curves (ROC curve) were made to predict the outcome of MODS.


RESULTS
In CG group, the area of ROC, the susceptibility and specificity were 0.823, 0.833, 0.731, respectively according to Lushan criteria, which were better than those (0.815, 0.767, 0.763) according to Marshall criteria. Then in group H2G, the area of ROC, the susceptibility and specificity according to Lushan criteria were lower than those according to Marshall criteria: 0.855, 0.583, 0.969 vs 0.914, 1.000, 0.657. The optimum cutoff points of partial pressure of oxygen in artery (PaO(2))/fractional concentration of inspired oxygen (FiO(2)) were 198.32 mmHg, 131.50 mmHg and 97.58 mmHg in group CG, H1G and H2G.


CONCLUSIONS
(1) There are significant differences between the diagnostic criteria of ARDS at high altitude and that on plains. The altitude of 1 517 m would be an important border line in diagnosing H-ARDS. (2) The drafted diagnostic criteria of ARDS at high altitude are feasible and practical in this region, but the range of the parameters is still wide, which need to be properly amended. (3) The changing tendency of the parameters of MODS at high altitude is different from that on plains, but the amount of sample needs to be accumulated further and the Lanzhou criteria needs to be perfected.
Zhang
Shi-fan
SF
Lanzhou General Hospital of People's Liberation Army, Lanzhou 730050, Gansu, China.
Zhang
De-hai
DH
Liu
Hui-ping
HP
Da
Ga
G
Gao
Wei
W
Lin
Shu-xin
SX
Chen
Tian-duo
TD
Liu
Fen-xue
FX
Liu
Chuan-lan
CL
D000367:Age Factors; D000531:Altitude; D002681:China; D006801:Humans; D009102:Multiple Organ Failure / Q000175:diagnosis* / Q000401:mortality; D017410:Practice Guidelines as Topic; D012128:Respiratory Distress Syndrome / Q000175:diagnosis* / Q000401:mortality; D012737:Sex Factors; D015996:Survival Rate