An objective study of acid reflux and cough in children using an ambulatory pHmetry-cough logger

Chang, A.B., Connor, F.L., Petsky, H.L., Eastburn, M.M., Lewindon, P.J., Hall, C., Wilson, S.J., & Katelaris, P.H. (2011) An objective study of acid reflux and cough in children using an ambulatory pHmetry-cough logger. Archives of Disease in Childhood, 96(5), pp. 468-472.

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Abstract

Objective

There are no objective ambulatory studies on the temporal relationship between reflux and cough in children. Commercial pHmetry loggers have slow capture rates (0.25 Hz) that limit objective quantification of reflux and cough. The authors aimed to evaluate if there is a temporal association between cough and acid pH in ambulatory children with chronic cough.

setting and patients

The authors studied children (aged <14 years) with chronic cough, suspected of acid reflux and considered for pHmetry using a specifically built ambulatory pHmetry–cough logger that enabled the simultaneous ambulatory recording of cough and pH with a fast (10 Hz) capture rate.

Main outcome measures

Coughs within (before and after) 10, 30, 60 and 120 s of a reflux episode (pH<4 for >0.5 s).

Results

Analysis of 5628 coughs in 20 children. Most coughs (83.9%) were independent of a reflux event. Cough–reflux (median 19, IQR 3–45) and reflux–cough (24.5, 13–51) sequences were equally likely to occur within 120 s. Within the 10 and 30 s time frame, reflux–cough (10 s=median 2.5, IQR 0–7.25; 30 s=6.5, 1.25–22.25) sequences were significantly less frequent than reflux–no cough (10 s=27, IQR 15–65; 30 s=24.5, 14.5–55.5) sequences, (p=0.0001 and p=0.001, respectively). No differences were found for 60 and 120 s time frame. Cough–reflux sequence (median 1.0, IQR 0–8) within 10 s was significantly less (p=0.0001) than no cough–reflux sequences (median 29.5, 15–67), within 30 s (p=0.006) and 60 s (p=0.048) but not within 120 s (p=0.47).

Conclusions

In children with chronic cough and suspected of having gastro-oesophageal reflux disease, the temporal relationship between acid reflux and cough is unlikely causal.

Impact and interest:

13 citations in Scopus
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12 citations in Web of Science®

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ID Code: 71255
Item Type: Journal Article
Refereed: Yes
Keywords: Clinical-practice guidelines, Chronic unexplained cough, Gastroesophageal-reflux, Acquired pneumonia
DOI: 10.1136/adc.2009.177733
ISSN: 1468-2044
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PAEDIATRICS AND REPRODUCTIVE MEDICINE (111400) > Paediatrics (111403)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Public Health & Social Work
Deposited On: 28 Aug 2014 22:56
Last Modified: 29 Jan 2015 00:20

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