[The effect of caloric test sequence on maximum slow-phase velocity].
OBJECTIVE
To determine the relation between level of nystagmic responses and caloric test sequence.


METHODS
A bithermal sequential caloric air irrigator was used to obtain maximum slow component speed caloric responses. One hundred and twenty patients who reported history of dizziness were divided to two groups. The first group is stimulated by different temperature air from hot to cold. The caloric test sequence of second group is opposite. The nystagmus was measured and recorded by electronystagmography.


RESULTS
The differences of maximum slow-phase speed between the cold and hot stimulus are relation with caloric test sequence (P<0.01). The second group is greater than the first group. The canal paresis (CP) and the directional preponderance (DP) relative difference of the second group were greater than the first group.


CONCLUSIONS
The caloric test sequences have effect on level of excitability of vestibular, the CP relative difference and DP relative difference.
Wen
Yanhua
Y
Department of Otolaryngology, Peking Union Hospital, Chinese Academy of Medical Sciences Peking Union Medical College, Beijing, 100730, China.
Zhang
Lianshan
L
Ge
Pingjiang
P
D000293:Adolescent; D000328:Adult; D000368:Aged; D002150:Caloric Tests / Q000379:methods*; D002648:Child; D004244:Dizziness / Q000175:diagnosis; D004584:Electronystagmography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009759:Nystagmus, Pathologic / Q000175:diagnosis