Re concussion deafness, J. S. and S. Fraser found in four cases of actual explosion injury, a ruptured drumhead and hemorrhage into the fundus of the internal meatus in three cases. They did not find evidence of neuro-epithelial changes. Possibly the fundus hemorrhages, besides giving rise to deafness, may start up the tinnitus and giddiness that are sometimes found. In one case, there were changes in the delicate nerve endings of the auditory ampullae.
Shell-shock: Deafness
Case 260. (Marriage, February, 1917.)
A shell burst behind an English lieutenant in 1914 without causing any wound but making him unconscious for an hour. During the hour the Germans passed by and stripped him of all articles of value. He came to and felt himself markedly deaf in both ears with an intense headache. There was no hemorrhage, no discharge, no tinnitus, no vertigo. Four days after the shell burst he could hear spoken words on each side at two feet, but could not hear a watch that could usually be heard from 3½ to 4 feet. With tuning fork C air and bone conduction proved much subnormal, though air conduction was better than bone conduction. With tuning fork C-5 air conduction was subnormal. Drums healthy. Improvement followed; hearing became normal eighteen days after explosion. The treatment was rest in bed with bromides early and strychnine later.
Marriage states that the psychical deafness due to shell-shock is usually bilateral and absolute. It is accompanied also, as a rule, by other nervous signs and symptoms, such as aphonia, tubular vision, paralyses, and anesthesias. Milligan and Westmacott state that the deafness is due to a functional suspension of neuronic impulses. They regard the brain as in a state of physical fatigue, and the mind as in a state of strain. There is no organic lesion. The neuronic impulses which are temporarily suspended are those which run from the higher cortical cells to the periphery.
Mine-explosion: Unconsciousness: Deaf-mutism. Recovery of speech after epistaxis and fever.
Case 261. (Liébault, October, 1916.)
A soldier, 24, teacher in civil life, was in a mine explosion November 27, 1914, at Vienne-le-Château. He was unconscious six weeks and remembered nothing of what had passed. They had told him that he had been blind for a month. After regaining consciousness he was a deaf-mute and for seven months he did not speak. His mutism did not bother him, as he thought he had always been mute. He had always been able to write. He could not remember what had interfered with his speech or tell whether he could think the words which he could not utter.