Neuro-otological studies of caloric reaction in healthy elderly individuals.

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  • 温度眼振反応に及ぼす加齢の影響に関する研究

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Abstract

Seventy-four healthy subjects between the ages of 65 and 88 years (mean=75 years), 21 men and 53 women, underwent the caloric test. The subjects were divided into two groups; 65-74 and 75-88 years of age. The caloric test was also performed in 20 healthy young individuals 20-29 years of age as a control group.<BR>The ears were irrigated with 20ml of ice water for 20 seconds. Caloric nystagmus was recorded by ENG with the eyes kept open in darkness.<BR>The total number of beats, the duration of nystagmus, the maximum velocity of the slow phase and the latent time of the nystagmus were recorded.<BR>The results in the elderly subjects were compared with the findings in the control group.<BR>1) The caloric reaction, measured by the duration of nystagmus and maximum velocity of the slow phase, appeared to be significantly decreased in the 75-88 years age group.<BR>2) Functional asymmetry of caloric response was revealed at the parameter maximum velocity of the slow phase in 5 subjects over 65 years of age.<BR>3) All the members of the control group complained of definite rotatory vertigo, but 12 subjects (8.1%) more than 65 years of age had no sensation of dizziness.<BR>4) Our investigation indicates that the caloric response is generally well preserved up to a highly advanced age.

Journal

  • Equilibrium Research

    Equilibrium Research 48 (2), 184-189, 1989

    Japan Society for Equilibrium Research

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