Association of elevated levels of vascular endothelial growth factor in obstructive sleep apnea syndrome with patient age rather than with obstructive sleep apnea syndrome severity.

Abstract

BACKGROUND:

Although certain studies report high levels of vascular endothelial growth factor (VEGF) in obstructive sleep apnea syndrome (OSAS), the effect of systemic hypoxia on circulating VEGF remains controversial.

OBJECTIVES:

To study the association of serum VEGF and OSAS in a large group of patients.

METHODS:

One hundred patients with OSAS (mean age 58.1+/-12.4 years, mean body mass index 30.6+/-5.4 kg/m2) were tested for serum VEGF levels, and the findings were correlated with the severity of OSAS, as determined by the apnea-hypopnea index (AHI) on the basis of polysomnography and background data.

RESULTS:

The mean AHI was 40.0+/-21.2 (range 10-106). Mean minimal oxygen saturation was 80.6+/-11.7% (range 43-98%) and mean time of oxygen saturation under 90% was 50.0+/-75.0 min (range 0-300 min). The mean VEGF level was 445.2+/-289.8 pg/ml in the study group (vs. 280 pg/ml reported in normal controls). The mean platelet count was 233.8+/-64.4 10(3)/ml and the mean VEGF/platelet ratio was 1.95+/-1.40 pg/10(6). There was no association of VEGF or VEGF/platelets with the severity of OSAS. However, both factors showed a significant correlation with patient age (r=0.224, p=0.01 and r=0.425, p=0.01, respectively). Age was the only parameter to significantly predict VEGF and VEGF/platelets on multivariate analysis (R2=0.713, p=0.001 and R2=0.844, p=0.001, respectively).

CONCLUSION:

The elevation of serum VEGF in OSAS is not associated with the severity of the disease, but it is associated with patient age. VEGF might be involved in the long-term adaptive mechanism in OSAS, and its age-dependent increase might partly explain the reduced mortality in elderly OSAS patients.

• Authors: Nir Peled, David Shitrit, Daniele Bendayan, Eli Peled, Mordechai R Kramer
• Journal: Respiration; international review of thoracic diseases (Respiration) Vol. 74 Issue 1 Pg. 50-5 ( 2007) ISSN: 0025-7931 [Print] Switzerland
• PMID: 16954652 (Publication Type: Journal Article)
• Copyright: Copyright (c) 2007 S. Karger AG, Basel.

Chemical References

• Biomarkers
• Vascular Endothelial Growth Factor A

Topics

• Adult
• Age Factors
• Aging (blood)
• Biomarkers (blood)
• Enzyme-Linked Immunosorbent Assay
• Female
• Humans
• Male
• Middle Aged
• Polysomnography
• Prognosis
• Severity of Illness Index
• Sleep Apnea, Obstructive (blood, mortality, physiopathology)
• Survival Rate (trends)
• Vascular Endothelial Growth Factor A (blood)