| http://www.w3.org/ns/prov#value | - If the lungs take up lower than normal amounts of radioisotope during a ventilation or perfusion scan, it may be due to:Airway obstructionAirway obstructionAn acute upper airway obstruction is a blockage of the upper airway, which can be in the trachea, voice box (laryngeal), or throat (pharyngeal) areas...Read Article Now
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