ちんかせいはいえん
沈下性肺炎
Hypostatic pneumonia
長時間寝たきりの人は上を向いて寝ていることが多いため、自然に気管(trachea)に唾液（唾）などが流れてしまい、誤嚥(accidental swallowing, aspiration) の状態となり肺炎を起こすこと。
Because bedridden people often lie in an upwards-facing position, saliva (spit) runs into their tracheas, bringing them into a state of accidentally swallowing or aspirating, which causes pneumonia to occur.