African dust clouds are associated with increased paediatric asthma accident and emergency admissions on the Caribbean island of Trinidad

ABSTRACT

Objective: To determine if there is any association between paediatric Accident & Emergency (A&E) asthma admissions and Saharan dust cloud cover Methods: A retrospective ecological study of paediatric asthma patients who attended the A&E department of the Eric Williams Medical Sciences Complex in relation to Saharan dust visibility andother climactic variables for the period May 23 2001 to May 13 2002. A quasi-likelihood approach was used to develop a statistical model for the relationship between acute paediatric asthma A&Evisits and Saharan dust cover.Results: 2655 A&E visits for acute asthma during the study period. There were significant associations between paediatric admissions and two climate variables; Saharan dust levels (p <0.05)and barometric pressure (p <0.01). In the absence of dust however, barometric pressure by itself hadno predictive power. Dust cover & barometric pressure were most strongly associated with increased admissions the day after dust cover Conclusions: Saharan dust cloud cover over Trinidad was associated with an increase inpaediatric asthma A&E visits on the following day. The dust effect was strongly influenced by prevailing barometric pressure; heavy dust cover and low pressure were most strongly associated with increased acute asthma visits.