1) The MV on the scalp of the parietal region in 23 healthy subjects and 16 O. D. patients ranging from 9 to 11 years of age was recorded at rest in the supine position.
2) The rate in percentage of the value in the tilt position (b) to that at rest in the supine position (a) was calculated in every subject. The average of the b/a ratio was 93% in the healthy subjects and 78% in the O. D. patients. A statistically significant difference was observed between these two groups.
3) The above results might be considered mainly due to a transitory greater decrease in cardiac output in O. D. patients in 20° head-up tilt position from the supine position at rest than that in healthy subjects.
4) The other factors affecting the results may be considered to be an increase in peripheral vascular resistance, the state of emotion, the sensitivity of the subject,
etc.
5) The study of the MV may give an important clue to the hemodynamics in O. D..
6) A statistically significant difference in the average dominant amplitude in the MV between the healthy subjects and the O. D. patients was obtained. Therefore the MV can be used as a diagnostic aid in O. D.
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