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. DESIGN, 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.
journal_name
Arch Dis Childjournal_title
Archives of disease in childhoodauthors
Chang AB,Connor FL,Petsky HL,Eastburn MM,Lewindon PJ,Hall C,Wilson SJ,Katelaris PHdoi
10.1136/adc.2009.177733subject
Has Abstractpub_date
2011-05-01 00:00:00pages
468-72issue
5eissn
0003-9888issn
1468-2044pii
adc.2009.177733journal_volume
96pub_type
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