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At least 217 records · Page 12Linked to original sources
PubMed1988

Infrared/video ENG recording of eye movements to evaluate the inferior vestibular nerve using the minimal caloric test.

The technique was originally developed to test the inferior vestibular nerve in tumor suspects whose high-frequency hearing loss exceeded the capabilities of the auditory brainstem response tests and whose electronystagmographic results showed no significantly reduced vestibular response. The test has subsequently been found effective to demonstrate persistent singular nerve fiber function in patients with persistent vertigo after retrolabyrinthine vestibular nerve section.

Caloric Tests↗
PubMed1976

The simultaneous binaural bithermal: a caloric test utilizing electronystagmography.

The simultaneous irrigation of both external auditory canals with the bithermal stimulus of Fitzgerald and Hallpike yields responses which demonstrate a greater sensitivity than the alternate irrigation of each ear. The responses were recorded utilizing electronystagmography and were compared to the alternate or regular bithermal performed on the same paitent.

Caloric Tests↗
PubMedDate not supplied

The directions of nystagmus and apparent self-motion evoked by caloric tests and angular accelerations.

PURPOSE: To further investigate the direction of (I) nystagmus and (II) self-motion perception induced by two stimuli: (a) caloric vestibular stimulations and (b) a sudden halt during vertical axis rotation. SUBJECTS AND METHODS: Twelve normal humans received caloric stimulation at 44 degrees C, 30 degrees C, and 20 degrees C while in a supine position with the head inclined 30 degrees upwards. In a second test they were rotated around the vertical axis with the head randomly placed in two positions: tilted 30 degrees forward or tilted 60 degrees backward, at a constant velocity of 90 degrees /sec for 2 minutes and then suddenly stopped. After both tests they were asked to describe their sensations of self-motion. Eye movements were recorded with an infrared video-technique. RESULTS: Caloric stimulation evoked only horizontal nystagmus in all subjects and induced a non-uniform complex perception of angular in frontal and transverse planes (the former dominated) and linear movements along the antero-posterior axis (sinking dominated) of the subject's coordinates. The self-motion was felt with the whole body or with a part of the body. Generally the perception evoked by cold (30 degrees C) and warm (44 degrees C) calorics was similar, although there were some differences. The stronger stimulus (20 degrees C) evoked not only quantitative but also qualitative differences in perception. The abrupt halt of rotation induced self-motion perception and nystagmus only in the plane of rotation. The self-motion was felt with the whole body. CONCLUSION: There was no difference in the nystagmus evoked by caloric stimulation and a sudden halt of vertical axis rotation (in head positions to stimulate the horizontal canals); however, the two stimuli evoked different perceptions of self-motion. Calorics provoked the sensation of self-rotation in the frontal plane and linear motion, which did not correspond to the direction of nystagmus, as well as arcing and a reset phenomenon during angular and linear self-motion, caloric-induced self-motion can be felt predominantly or only with a part of the body, depending on the self-motion intensity. The findings indicate that, unlike the self-motion induced by sudden halt of vertical axis rotation, several mechanisms take part in generating caloric-induced self-motion.

Acceleration↗
PubMed2005

[Cross-check of caloric test and head shaking nystagmus].

OBJECTIVE: To investigate the manifestation of head shaking nystagmus (HSN) and the relationship between HSN and vestibular bithermal test while cross-checking the HSN and vestibular bithermal test. METHODS: One hundred and twenty-four patients were examined by HSN and vestibular bithermal test. The latency and duration of HSN were observed and the dynamic changes of HSN were also investigated. The results of bithermal test were clarified by the values of canal paresis (CP). RESULTS: There were 3 types of HSN, including 41 monophasic HSN, 11 biphasic HSN and 7 perverted HSN. The latency of monophasic HSN was (2.75 +/- 1.41) ms and the duration of it was (32.16 +/- 20.30) ms; as for the biphasic HSN, the first phase had no latency and the duration was (12.33 +/- 4.42) ms which was shorter than that of the second phase (57.00 +/- 17.19) ms (P < 0.01) and the latency of second phase was (57.00 +/- 17.19) ms. The value of canal paresis in the patients without HSN was lower than that in the patients with HSN. CONCLUSIONS: The existence of HSN was dependent on the loss of the function horizontal canal and also on the stage of vestibular compensation. The variation of duration of HSN among individuals was great. In the acute stage of unilateral vestibular function loss, there appeared to be prominent HSN, and the direction of HSN is the same as that of spontaneous nystagmus. With the development of vestibular compensation, biphasic nystagmus would appear instead of monophasic HSN and the direction of first phase represent the direction of un-lesioned side. After compensation, HSN would not be elicited. However,when HSN existed, it suggested that the value of CP should exceed 25%. Perverted nystagmus pointed to central abnormality.

Adolescent↗
PubMed1989

[Clinical evaluation of the sinusoidal caloric test].

The aim of this work was the results comparison in Proctor-Dix and Fitzgerald-Hallpike tests. The examinations were performed in 22 normal and in 34 patients with vestibular syndromes. In ENG recordings the symetricity was evaluated as well as the feeling of dizziness and vegetative symptoms. The pendular trial was made during the caloric nystagmus in two above mentioned methods. The sinusoidal Proctor-Dix test was more sensible than classic test and easy for patients. In some instances the cold excitation fails to provoke the reaction in sinusoidal test in spite of reaction in classic test. The pendular trial in Proctor-Dix test is difficult to obtain.

Adolescent↗
PubMed1979

Monothermal upright-inverted caloric test.

This study evaluates the diagnostic sensitivity of a simple method of producing bidirectional cupular deviation using a monothermal stimulus. This stimulus has the advantage of conservation of time and increased patient comfort and acceptance (two caloric irrigations instead of four). Each patient was seated with his head extended 60 degrees during the caloric irrigation. Eighty seconds after the onset of irrigation, the patient placed his head forward, thereby causing both an ampullopetal and ampullofugal flow of endolymph. Right/left difference and directional preponderance were computed for both monothermal warm and monothermal cold irrigations and compared to the traditional bithermal caloric results. This study comprised a control group of 13 normal patients and 144 dizzy patients. False positive (abnormal monothermal but normal bithermal) and false negative (normal monothermal but abnormal bithermal) tests occurred in 45 percent and 50 percent of examinations, respectively. Inaccurate measurement of the weak slow phase velocity that usually accompanies the inverted position was a probable cause of the poor correlation between test results since a separate analysis of electronystagmograms with more intense nystagmus in the inverted position resulted in an improved correlation. Further evaluation of this technique should include methods that result in more accurate measurement of slow phase velocity.

Adolescent↗