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Dr von Hauner Children's Hospital, Ludwig-Maximilians-University, Munich, Germany
CORRESPONDENCE: M. Griese, Kinderklinik and Kinderpoliklinik im Dr. von Haunerschen Kinderspital, Ludwig-Maximilians-University, Pettenkoferstrasse 8a, D-80336, Munich, Germany. Fax: 49 8951603477. E-mail: griese@pk-i.med.uni-muenchen.de
Keywords: asthma, inhaled steroids, nitric oxide
Received: September 8, 2001
Accepted January 12, 2002
This study was supported by Astra GmbH (Wedel, Germany).
Exhaled nitric oxide (eNO) is elevated in several inflammatory airway diseases and is significantly reduced by anti-inflammatory treatment with inhaled steroids. The aim of this randomized, open clinical trial was to evaluate eNO in relation to conventional lung function parameters at rest and after exercise during sequential changes of inhaled steroids in children with persistent asthma.
The study consisted of a 4 week run-in period, a 4 week washout phase and a randomized treatment period during which only one group was treated again with inhaled budesonide.
After run-in, eNO was reduced to normal values, and rose again during washout. In the patients randomized to steroid treatment, eNO was again decreased, whereas it remained unchanged in the untreated patients. Forced expiratory volume in one second and forced vital capacity at rest and after exercise improved significantly after run-in, but showed no difference after randomization. However there was a strong correlation of eNO with patient compliance.
Exhaled nitric oxide was able to differentiate between children briefly treated with or without steroids, the conventional lung-function variables however could not. In practice exhaled nitric oxide may thus be a valuable parameter to monitor adherence to steroids, but less suitable to describe physiologically relevant impairments of lung function.
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