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[Changes of pulmonary diffusing capacity in subjects with acute mountain sickness]
Summary
Reduced pulmonary diffusing capacity is linked to acute mountain sickness (AMS). This indicates gas exchange abnormalities, potentially due to early lung edema, affecting climbers at high altitudes.
Area of Science:
- Physiology
- Altitude Medicine
- Respiratory System
Context:
- Acute mountain sickness (AMS) affects individuals ascending to high altitudes.
- Pulmonary diffusing capacity, specifically for carbon monoxide (DLco), is a key indicator of lung function.
- Understanding the physiological changes during acclimatization is crucial for preventing altitude-related illnesses.
Purpose:
- To investigate if reduced pulmonary diffusing capacity in individuals with AMS indicates early-stage high-altitude pulmonary edema (HAPE).
- To compare DLco and blood gas parameters between AMS and non-AMS groups at different altitudes.
- To establish the correlation between DLco and AMS severity.
Summary:
- Thirty-two subjects were categorized into AMS and non-AMS groups based on the Lake Louise Consensus criteria.
- Pulmonary diffusion capacity for carbon monoxide (DLco) and arterialized capillary blood gases were measured at 2,260 m and 4,700 m.
- The AMS group showed a significantly lower increase in DLco and a greater alveolar-arterial oxygen pressure difference at 4,700 m compared to the non-AMS group. DLco negatively correlated with AMS score (r = -0.885, P < 0.01).
Impact:
- Decreased pulmonary diffusing capacity plays a significant role in the incidence of AMS.
- The findings suggest subclinical interstitial edema as a likely cause of pulmonary gas exchange abnormalities in AMS.
- This research highlights the importance of monitoring DLco for early detection and management of altitude-related respiratory issues.