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The Effect of Postural Changes on Spirometric Indices of Upper Airway Obstruction | ||
| Kerbala Journal of Medicine | ||
| Article 1, Volume 6, Issue 2, 2013, Pages 1608-1614 PDF (0 K) | ||
| Authors | ||
| Ali Mansoor Al-Ameri; Ahmad Jumah Mhows; Mudhaffar Sami Khaza | ||
| Abstract | ||
| the spirometric diagnosis of upper airway obstruction is an important non-invasive technique that was validated for the diagnosis of such lesions relying on several indices that were derived from the flow volume loops of patients. Objectives: Is to find out if postural changes have an effect on spirometric indices of airway obstruction in healthy subjects and if so, does this merit performing the test in supine posture? Subjects and methods: This study conducted in the department of physiology and medical physics/ Kerbala medical college, in which 17 males aged from 18-19 years (18.53 ± 0.51), had BMI of (22.95 ± 2.11 Kg/M2 ), heights of (1.75 ± 0.14 meters) and weights of (70.32 ± 6.34 Kgs) were enrolled. The following spirometric data were measured in two different body positions (erect versus supine): Forced vital capacity (FVC), Forced inspiratory flow at 50% of vital capacity (FIF50%), Forced expiratory flow at 50% of vital capacity (FEF50%), Forced expiratory volume in first second (FEV1), Forced expiratory volume in first 0.5 second (FEV 0.5), Peak inspiratory flow (PIF) and Peak expiratory flow (PEF). From these data, the following indices of upper airway obstruction were derived: (FEV1/ FEV0.5, FEV1/ PEF, FEF50%/ FIF50%, and PEF/PIF). These indices were compared with each other in respect to two body positions. Results: 1- All the measured inspiratory and expiratory flow rates were significantly lower in supine position (p < 0.05). 2- Of the four measured indices of upper airway obstruction, only the FEV1/PEF ratio increased significantly (p < 0.05) by about 27% upon reclining. | ||
| Keywords | ||
| PFT; UAO; FVL; Body posture; and OSAS | ||
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