Abstract
To determine whether nocturnal hypoxaemia contributes to the excessive erythrocytosis (EE) in Andean natives, standard polysomnographies were performed in 10 patients with EE and in 10 controls (mean haematocrit 76.6±13% and 54.4±0.8%, respectively) living at an altitude of 4,380 m. In addition, the effect of O2 administration for 1 h prior to sleep, and the relationship between the hypoxic/hypercapnic ventilatory response and the apnoea/hypopnoea index (AHI) during sleep were studied. Awake arterial oxygen saturation (Sa,O2) was significantly lower in patients with EE than in controls (83.7±0.3% versus 85.6±0.4%). In both groups, the mean Sa,O2 significantly decreased during sleep (to 80.0±0.8% in EE and to 82.8±0.5% in controls). The mean Sa,O2 values remained significantly lower in patients with EE than in controls at all times of the night, and patients with EE spent significantly more time than the controls with an Sa,O2 of 2 administration. In both groups the AHI positively correlated with the hypercapnic ventilatory response. Andean natives undergo minor respiratory disorders during sleep. The reduction in oxygen saturation found in subjects with excessive erythrocytosis was small, yet consistent and potentially important, as it remained below the threshold known for the increase in erythropoietin stimulation. This may be an important factor promoting erythropoiesis, but its relevance needs to be further explored.
| Original language | English |
|---|---|
| Pages (from-to) | 41-46 |
| Number of pages | 6 |
| Journal | European Respiratory Journal |
| Volume | 23 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2004 |
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Keywords
- Autonomic nervous system
- Chronic mountain sickness
- Erythropoietin
- High altitude
- Polycythaemia
- Sleep disturbances
ASJC Scopus subject areas
- Pulmonary and Respiratory Medicine
Cite this
Sleep-related hypoxaemia and excessive erythrocytosis in Andean high-altitude natives. / Spicuzza, Lucia; Casiraghi, N.; Gamboa, A.; Keyl, C.; Schneider, A.; Mori, A.; Leon-Velarde, F.; Di Maria, G. U.; Bernardi, L.
In: European Respiratory Journal, Vol. 23, No. 1, 01.2004, p. 41-46.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Sleep-related hypoxaemia and excessive erythrocytosis in Andean high-altitude natives
AU - Spicuzza, Lucia
AU - Casiraghi, N.
AU - Gamboa, A.
AU - Keyl, C.
AU - Schneider, A.
AU - Mori, A.
AU - Leon-Velarde, F.
AU - Di Maria, G. U.
AU - Bernardi, L.
PY - 2004/1
Y1 - 2004/1
N2 - To determine whether nocturnal hypoxaemia contributes to the excessive erythrocytosis (EE) in Andean natives, standard polysomnographies were performed in 10 patients with EE and in 10 controls (mean haematocrit 76.6±13% and 54.4±0.8%, respectively) living at an altitude of 4,380 m. In addition, the effect of O2 administration for 1 h prior to sleep, and the relationship between the hypoxic/hypercapnic ventilatory response and the apnoea/hypopnoea index (AHI) during sleep were studied. Awake arterial oxygen saturation (Sa,O2) was significantly lower in patients with EE than in controls (83.7±0.3% versus 85.6±0.4%). In both groups, the mean Sa,O2 significantly decreased during sleep (to 80.0±0.8% in EE and to 82.8±0.5% in controls). The mean Sa,O2 values remained significantly lower in patients with EE than in controls at all times of the night, and patients with EE spent significantly more time than the controls with an Sa,O2 of 2 administration. In both groups the AHI positively correlated with the hypercapnic ventilatory response. Andean natives undergo minor respiratory disorders during sleep. The reduction in oxygen saturation found in subjects with excessive erythrocytosis was small, yet consistent and potentially important, as it remained below the threshold known for the increase in erythropoietin stimulation. This may be an important factor promoting erythropoiesis, but its relevance needs to be further explored.
AB - To determine whether nocturnal hypoxaemia contributes to the excessive erythrocytosis (EE) in Andean natives, standard polysomnographies were performed in 10 patients with EE and in 10 controls (mean haematocrit 76.6±13% and 54.4±0.8%, respectively) living at an altitude of 4,380 m. In addition, the effect of O2 administration for 1 h prior to sleep, and the relationship between the hypoxic/hypercapnic ventilatory response and the apnoea/hypopnoea index (AHI) during sleep were studied. Awake arterial oxygen saturation (Sa,O2) was significantly lower in patients with EE than in controls (83.7±0.3% versus 85.6±0.4%). In both groups, the mean Sa,O2 significantly decreased during sleep (to 80.0±0.8% in EE and to 82.8±0.5% in controls). The mean Sa,O2 values remained significantly lower in patients with EE than in controls at all times of the night, and patients with EE spent significantly more time than the controls with an Sa,O2 of 2 administration. In both groups the AHI positively correlated with the hypercapnic ventilatory response. Andean natives undergo minor respiratory disorders during sleep. The reduction in oxygen saturation found in subjects with excessive erythrocytosis was small, yet consistent and potentially important, as it remained below the threshold known for the increase in erythropoietin stimulation. This may be an important factor promoting erythropoiesis, but its relevance needs to be further explored.
KW - Autonomic nervous system
KW - Chronic mountain sickness
KW - Erythropoietin
KW - High altitude
KW - Polycythaemia
KW - Sleep disturbances
UR - http://www.scopus.com/inward/record.url?scp=0347136003&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0347136003&partnerID=8YFLogxK
U2 - 10.1183/09031936.03.00000703
DO - 10.1183/09031936.03.00000703
M3 - Article
VL - 23
SP - 41
EP - 46
JO - European Journal of Respiratory Diseases
JF - European Journal of Respiratory Diseases
SN - 0903-1936
IS - 1
ER -