Impact of HVS on asthma
The number of asthma exacerbations and severe exacerbations during the previous12 months and the ACT score did not differ between children with a positive HVT and those with a negative HVT (Table 2). However, ACT score results were available for only 47 children (42%). Similarly, the use of oral corticosteroid for asthma exacerbations or the number of visits to the emergency room for an asthma exacerbation during the last 12 months did not differ between children with a positive and those with a negative HVT. Lung function (pre-bronchodilator FEV1, reversibility, RV/TLC ratio) of patients with a positive HVT was identical to that of children with a negative test.