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Lung India Official publication of Indian Chest Society  
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Year : 1989  |  Volume : 7  |  Issue : 3  |  Page : 107-111

Comparison Of Diurnal And Circadian Variations In Normals, Bronchial Asthmatics And Chronic Bronchitics



Correspondence Address:
J. D Patil


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A study of diurnal variation from 6 a.m. to 10 p.m. in subjects categorised as normal, asthma and chronic bronchitis was assessed along with three weekly (10 a.m.) readings. The asthmatics showed the maximal diurnal change of 0.56 ± 0.36 Lit. (25%) for FVC, 0.51 ± 0.34 Lit (39%) for FEV1, 100 ± 61 Lit. (43%) for PEFR, 38 ± 21 Lit. (65%) for FEF0.25-0.75 and 78 ± 58 Lit. (57%) for MEFR200-1200. For bronchitis, these variations respectively were 0.36 ± 0.31 (22%), 0.28 ± 0.20 (33%), 61 ± 30 (29%), 17 ± 13 (52%) and 59 ± 48 (64%) liters. For three weekly variations in morning values, the mean maximal change was: for FVC (ml) 45 ± 36 (1.6%), 364 ± 220 (15.4%) and 316 ± 161 (15%), in the three categories of subjects. Similar values for FEV1 (ml) were 55 ± 13 (1.8%), 414 ± 254 (38.9%) and 239 ± 116 (23%) and for PEFR (Lit.), 16 ± 5 (2.7%), 75 ± 39 (28.6%) and 48 ± 33 (19.2%) respectively for other two flow rates, the variations were larger. For discriminating between the three categories, changes in PEFR were most useful. Though diurnal and weekly variations of functional parameters (in normals were minimal and largest in asthmatics, the distinction from bronchitics, was not sharp in 40% of patients.


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