Effect of increased lung volume on sleep disordered breathing in patients with sleep apnoea
| Autor: | Amy S. Jordan, Atul Malhotra, Raphael Heinzer, Yu-Lun Lo, Michael L. Stanchina, David P. White, Karen Schory, Sanjay R. Patel, Louise Dover, Andrew Wellman |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Adult
Male Pulmonary and Respiratory Medicine medicine.medical_treatment medicine Humans Lung volumes Continuous positive airway pressure Oxygen saturation (medicine) Analysis of Variance Sleep Apnea Obstructive Continuous Positive Airway Pressure business.industry Respiratory disease Sleep apnea Middle Aged medicine.disease Sleep in non-human animals respiratory tract diseases Treatment Outcome medicine.anatomical_structure Anesthesia Abdomen Female Lung Volume Measurements Sleep Disordered Breathing business Airway |
| Zdroj: | Thorax. 61:435-439 |
| ISSN: | 0040-6376 |
| DOI: | 10.1136/thx.2005.052084 |
| Popis: | Background: Previous studies have shown that changes in lung volume influence upper airway size and resistance, particularly in patients with obstructive sleep apnoea (OSA), and that continuous positive airway pressure (CPAP) requirements decrease when the lung volume is increased. We sought to determine the effect of a constant lung volume increase on sleep disordered breathing during non-REM sleep. Methods: Twelve subjects with OSA were studied during non-REM sleep in a rigid head-out shell equipped with a positive/negative pressure attachment for manipulation of extrathoracic pressure. The increase in lung volume due to CPAP (at a therapeutic level) was determined with four magnetometer coils placed on the chest wall and abdomen. CPAP was then stopped and the subjects were studied for 1 hour in three conditions (in random order): (1) no treatment (baseline); (2) at “CPAP lung volume”, with the increased lung volume being reproduced by negative extrathoracic pressure alone (lung volume 1, LV1); and (3) 500 ml above the CPAP lung volume(lung volume 2, LV2). Results: The mean (SE) apnoea/hypopnoea index (AHI) for baseline, LV1, and LV2, respectively, was 62.3 (10.2), 37.2 (5.0), and 31.2 (6.7) events per hour (p = 0.009); the 3% oxygen desaturation index was 43.0 (10.1), 16.1 (5.4), and 12.3 (5.3) events per hour (p = 0.002); and the mean oxygen saturation was 95.4 (0.3)%, 96.0 (0.2)%, 96.3 (0.3)%, respectively (p = 0.001). Conclusion: An increase in lung volume causes a substantial decrease in sleep disordered breathing in patients with OSA during non-REM sleep. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|