Between 1991 and 1993, 230 patients visited Wakkanai Municipal Hospital because of foreign bodies in the nasal cavity, external auditory canal or pharynx, and between 1984 and 1993, 35 patients because of foreign bodies in the esophagus or upper respiratory tract.
Of the 265 patients, 110 had a foreign body in the pharynx, 73 in the external auditory canal, 47 in the nasal cavity, 24 in the esophagus, and 11 in the upper respiratory tract.
The most common foreign bodies were fish bones in the pharynx or esophagus, cotton balls in the external auditory canal, and BB bullets in the nasal cavity.
Two patients had accidentally inhaled pieces of crab shells into the trachea. Since they were hollow cylinders, they did not cause suffocation. They could not be removed in one piece because the spines of the shells were stuck in the lining of the trachea so they had to be crushed and the fragments removed.
The incidence of foreign body cases in Soya was calculated to be 8 to 10 per ten thousand people per year.
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