Abstract:
STUDY OBJECTIVE:To determine whether urinary leukotriene E4 (uLTE4) levels increase upon exposure to high altitude, and also to ascertain the relationship between uLTE4 levels and symptoms of acute mountain sickness (AMS). DESIGN:Prospective, unblinded, single-factor (altitude) experimental study. SETTINGS:US Army research laboratory facilities at sea level ([SL] 50 m), 1,830 m, and 4,300 m. PARTICIPANTS:Eight healthy male subjects ranging in age from 19 to 24 years. MEASUREMENTS:uLTE4 levels and symptoms of AMS were measured at just above SL (50 m), 3 1/2 days after being transported from SL to moderate altitude (MA) (1,830 m), and 1 1/2 days after ascent from 1,830 to 4,300 m (high altitude [HA]). Symptoms of AMS were assessed using standard indexes derived from the Environmental Symptoms Questionnaire weighted toward cerebral (AMS-C) and respiratory (AMS-R) manifestations. Oxygen saturation was measured noninvasively by pulse oximetry at SL and HA. RESULTS:The mean (+/-SEM) uLTE4 levels (pg/mg creatinine) were 67.9 (+/-13.2) at SL; 82.3 (+/-5.5) at MA; and 134.8 (+/-19.4) at HA (p < 0.05 comparing HA with SL and MA). CONCLUSIONS:We conclude that uLTE4 levels increase shortly after exposure to HA even after staging for 4 days at MA. Although this study does not clearly demonstrate a relationship between uLTE4 levels and symptoms of AMS, it supports the hypothesis that leukotrienes may be involved in the pathophysiologic state of AMS.
journal_name
Chestjournal_title
Chestauthors
Roach JM,Muza SR,Rock PB,Lyons TP,Lilly CM,Drazen JM,Cymerman Adoi
10.1378/chest.110.4.946subject
Has Abstractpub_date
1996-10-01 00:00:00pages
946-51issue
4eissn
0012-3692issn
1931-3543pii
S0012-3692(15)46488-8journal_volume
110pub_type
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