Intraocular pressure at a simulated altitude of 9000 m with and without 100% oxygen
Aviation Space and Environmental Medicine, cilt.77, sa.7, ss.704-706, 2006 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 77 Sayı: 7
- Basım Tarihi: 2006
- Dergi Adı: Aviation Space and Environmental Medicine
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.704-706
- Anahtar Kelimeler: intraocular pressure, high altitude, ocular tonometry
- Sağlık Bilimleri Üniversitesi Adresli: Evet
Özet
Introduction: Exposure to high altitude may affect intraocular pressure (IOP). This study aimed to determine how IOP was altered by two different inspired oxygen tensions at altitude. Methods: There were 34 healthy male pilots, ages 26-39 yr (mean 31.9 yr), who were studied at the Air Health Examination and Physiological Training Centre in Eskisehir, Turkey. They were studied at ground level, which is 792 m (2414 ft), and during a training session in a hypobaric chamber at a simulated altitude of 9144 m (30,000 ft). IOP was measured with a Tone-pen XL tonometer before subjects entered the chamber, at altitude while breathing 100% oxygen by mask and after removing the mask, and again 30 min after leaving the chamber. Results: Ground level values for IOP (mean ± SD) were 12.31 ± 2.98 mmHg. Levels increased significantly at altitude on oxygen (16.75 ± 4.14 mmHg) and decreased slightly on breathing ambient air (14.37 ± 3.44 mmHg). In 30 min after leaving the chamber, IOP was 12.81 ± 1.74 mmHg, indistinguishable from pre-test values. Discussion: Healthy subjects whose baseline IOP is in the normal range experience only a small, temporary elevation of IOP during passive exposure to high altitude with either normoxia or acute hypoxia. Copyright © by Aerospace Medical Association.