the purpose of this investigation was to determine whether inhalation of a freon gas mixture , the propellant of the commercial metered-dose aerosols , consisting of freon 11 , freon 12 , and freon 114 , reduces the bronchodilating effects of inhaled salbutamol or ipratropium bromide or causes cardiac arrhythmias in control , asthmatic and bronchitic subjects .
C0001927
salbutamol
C0004096
asthmatic