山梨医科学雑誌　第21巻1号　009-014(2006)

＜Original Article＞
Evaluation of Hemodynamics and Oxygenation
in Climbers with Acute Mountain Sickness

Atsuo KAWAMURA, Satoshi KASHIMOTO, Hang ZHAO, Norimitsu NAGAMINE,　Shigeki MITANI, and Takeshi SUGAWARA

Abstract: Symptoms of acute mountain sickness (AMS) include severe headache, nausea and vomiting, dizziness, irritability, decreased concentration, and lack of energy. This study evaluated the differences of hemodynamics and pulse oxygenation (sPO2) between unacclimatized climbers and longterm sojourners at high altitude (3,000 m). At the eighth station of Mt. Fuji (3,000 m), we measured physical status, blood pressure, heart rate, and oxygen saturation of acclimatized climbers who suffered from some of the symptoms of AMS. Based on their symptoms, they were divided into two groups: AMS and no AMS. The data obtained for these two groups were compared with those of long-term sojourners. Parametric and non-parametric data were analyzed by ANOVA and Kruskal Wallis tests, respectively. There were no significant differences in gender among the groups. However, height in the long-term sojourner group was higher and weight in the long-term sojourner group was heavier than those in the AMS and no AMS groups. In additon, recent sleeping time in the longterm sojourner group was significantly longer than those in the AMS and no AMS groups. The longterm sojourner group had more experience in climbing Mt. Fuji than the AMS and no AMS groups. There were no significant differences in systolic and diastolic pressure among the 3 groups. However, heart rate in the no AMS and AMS groups was significantly higher than that in the long-term sojourner group. sPO2 in the AMS group was significantly lower than those in the no AMS and longterm sojourner groups. In addition, sPO2 in the no AMS group was lower than that in the long-term sojourner group. These findings indicate that altitude increase correlated with an increase in heart rate and a decrease in pulse oxygenation and that AMS might be related to low oxygenation. A portable pulse oximeter is useful for diagnosing AMS.

Acute Mountain Sickness, Pulse Oximetry, Heart rate



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