A 38-year-old hairdresser with irritant-associated vocal cord dysfunction.

The present case study reports the first case of a 38-year-old hairdresser with irritant-associated vocal cord dysfunction (VCD) due to alkaline persulfate, who was referred on suspicion of occupational asthma. Several tests were performed, including specific inhalation challenge and upper airway endoscopy. During the specific inhalation challenge to alkaline persulfate, the patient experienced dysphonia and a non-significant decrease in forced expiratory volume in 1 second on spirometry.

Respiratory impedance response to a deep inhalation in asthmatic children with spontaneous airway obstruction.

The aim of the study was to determine whether the bronchomotor effect of a deep inhalation (DI) may be detected during tidal breathing in asthmatic children with spontaneous airway obstruction (AO). Two groups of children aged 5-15 yrs were studied. AO was mild in group 1 (n=12, forced expiratory volume in one second (FEV1) > or = 75% predicted) and moderate-to-severe in group 2 (n=9, FEV1 > or = 70% pred).

Respiratory impedance response to a deep inhalation in children with history of cough or asthma.

The aim of this study was to describe the change in respiratory impedance induced by a deep inhalation (DI) in children who developed a positive response to inhalation of methacholine (Mch). Eighteen children aged 4.5-12.