Pneumologie
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Practice Guideline Guideline
[Recommendations for preoperative diagnosis of lung function. German Society of Pneumology].
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Ozone is a constituent of the natural ambient atmosphere and occurs dependent on weather and environment in concentrations that can trigger airway inflammation. Oxygen concentrators are employed in oxygen long-term therapy and produce in the room air a mixture of concentrated oxygen and residual gases of unknown ozone concentration. ⋯ Both under room air conditions and under increased ozone concentrations of up to 12 ppm in the surrounding air the residual gas mixture of the air produced by the oxygen concentrator did not contain any ozone concentration beyond 0.005 ppm. This prompts us to suggest that the oxygen concentrators examined by use are ozone eliminators rather than ozone concentrators.
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Functional disturbances of the larynx can obstruct respiratory airflow resulting in dramatic states of dyspnoea or shortness of breath. Whereas in inspiratory functional laryngospasm the diagnosis is suggested by inspiratory stridor and hoarseness, it is often difficult to differentiate between the two expiratory forms, namely, laryngospasm in asthma and laryngeal pseudoasthma on the one hand, and an obstructive disease of the lower respiratory tract on the other. ⋯ Pulmonary functional analysis and laryngoscopy are the most important diagnostic procedures in this regard. Even if it is not always possible to achieve the desired freedom from symptoms by means of respiratory therapy, logopaedics or psychotherapy, a correct diagnosis will nevertheless protect both the patient and the doctor against further useless attempts at drug treatment.