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Lung India Official publication of Indian Chest Society  
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Year : 1994  |  Volume : 12  |  Issue : 4  |  Page : 186-191

Oxygen Saturation, Breathing Pattern And Arrhythmias In Patients Of Chronic Obstructive Pulmonary Disease And Bronchial Asthma During Sleep

Correspondence Address:
H. S Hira

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Ten each of Chronic Obstructive Pulmonary Disease COPD (Group I) and bronchial asthma (Group II), and same number of healthy adults (Group III) were selected for monitoring of SaO2, breathing pattern and arrhythmias during sleep. The Maximum change in SaO2 during sleep was 11% (6-17%) in Group I, 6.3% (4-9%) in Group II and 4% (3-6%) in Group III and this fall was significant in both Group I and II (p<0.005). Oxygen desaturation below 85% was present during 18.4% of mean TST in Group I only. Group I had more disturbed sleep than Group II and III. Both Vt and Vmin decreased by 14.9% (mean) and 10.2% (mean) in Group I and II respectively during sleep which was significant (p<0.01). The Vt/Ti demonstrated elevated respiratory drive during awake time in Group I and II and reduced further during sleep. The % RC lessened during sleep in all subjects. The Total Compartment Displacement/Tidal volume (TCD/Vt) ratio revealed asynchronous breathing in COPD patients during sleep. Arrhythmias were detected in four (41%) in Group I, three (30%) each in Group II and III. Apnea-hypopnea were detected in all subjects, but not qualifying for sleep apnea syndrome. In this study, the significant SaO2 was found in COPD patients during sleep. Respiratory drive reduced in both COPD and asthmatic patients. There was significant asynchronous breathing in COPD patients during sleep. No significant and dangerous arrhythmias were demonstrated.

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