RT Journal Article
SR Electronic
T1 Acute mountain sickness is related to nocturnal hypoxemia but not to hypoventilation
JF European Respiratory Journal
JO Eur Respir J
FD European Respiratory Society
SP 303
OP 308
DO 10.1183/09031936.04.00006504
VO 24
IS 2
A1 P. Erba
A1 S. Anastasi
A1 O. Senn
A1 M. Maggiorini
A1 K.E. Bloch
YR 2004
UL http://erj.ersjournals.com/content/24/2/303.abstract
AB The purpose of the study was to investigate determinants of acute mountain sickness after rapid ascent to high altitude. A total of 21 climbers were studied ascending from <1,200 m to Capanna Regina Margherita, a hut in the Alps at 4,559 m, within <24 h. During their overnight stay at 4,559 m, breathing patterns and ventilation were recorded by calibrated respiratory inductive plethysmography along with pulse oximetry. In the following morning, acute mountain sickness was assessed. Altogether, 11 mountaineers developed pronounced symptoms of acute mountain sickness (Lake Louise score ≥5) and 10 did not (controls). Compared to controls, subjects with acute mountain sickness had lower nocturnal oxygen saturation (mean±sd 59±13% versus 73±6%), higher minute ventilation (7.94±2.35 versus 6.06±1.34 L·min−1), and greater mean inspiratory flow, a measure of respiratory centre drive (0.29±0.09 versus 0.22±0.05 L·s−1). Periodic respiration was prevalent but not significantly different among the two groups (apnoea/hypopnea index 60.1±34.6 versus 47.1±42.6 events per h). The data suggest that pronounced nocturnal hypoxemia, which was not related to hypoventilation, may have promoted acute mountain sickness. Periodic breathing seems not to play a predominant role in the pathogenesis of acute mountain sickness. This study was supported by Fondazione Crivelli and Hartmann-Müller Stiftung.