Aerosols of methacholine chloride are used in inhalation tests to measure non-specific bronchial responsiveness. Inhalation challenge solutions are not commercially available neither by pharmaceutical industry nor in France by the PCH-APHP. To reply to doctor's request, dilute concentrations of methacholine must be prepared properly in order to protect the patient and to assure doctor of test reproductibility. Osmolarity, pH and degradation of different dilute concentration of methacholine chloride have been compared with two diluents. This study allowed us to validate our preparation of solutions.
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