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** [[Pectus excavatum]] | ** [[Pectus excavatum]] | ||
* Impaired airways (rarely causes hypoventilation by itself) | * Impaired airways (rarely causes hypoventilation by itself) | ||
** Acute exacerbation of [[COPD]] or [[asthma]] | |||
** [[Foreign body aspiration]] | ** [[Foreign body aspiration]] | ||
** External airway obstruction ([[goitre]], tumour) | ** External airway obstruction ([[goitre]], tumour) |