Biomedical subjects

J H Calder

Publications and source records attributed to J H Calder.

5 recordsLinked to original sources

PubMed2000

Self-perceived balance disability/handicap in the presence of bilateral peripheral vestibular system impairment.

The purpose of this report was to characterize the self-perceived balance disability/handicap of patients with bilateral reductions and bilateral complete losses of peripheral vestibular system function. Data from 72 patients whose electronystagmography and rotational examinations suggested normal, unilateral, or bilateral reductions in peripheral vestibular system function were used in the first investigation. Patients also completed a Dizziness Handicap Inventory (DHI). Results demonstrated significant group differences for DHI total and physical subscale scores. There were significant differences between normal and bilateral weakness groups for the total DHI score and between normal and unilateral and normal and bilateral weakness groups for the physical subscale score. In a second investigation, an item analysis of the DHI is presented for five patients with bilateral complete losses of peripheral vestibular system function. Results show that, predictably, these patients have difficulty engaging in activities requiring an intact vestibulocular reflex (e.g., physical activities such as sports, household chores).

Persons with Disabilities↗

PubMed2000

Acquired bilateral peripheral vestibular system impairment: rehabilitative options and potential outcomes.

Acquired bilateral vestibular impairment can be a devastating disorder that is most frequently the result of aminoglycoside-induced toxicity. The presenting complaints are typically oscillopsia and gait and balance disturbances. These patients can be excellent candidates for vestibular rehabilitation therapy that focuses on facilitating maximal use of any remaining vestibular function, improving gaze and postural stability through the use of visual and somatosensory cues, and improving home and workplace safety. The prognosis for recovery is determined by the extent of the loss and the presence of other progressive disorders that may affect vision or somatosensation, coexisting illnesses, and the patient's compliance with the therapy program. Two cases are presented to illustrate the salient aspects of vestibular rehabilitation for patients with acquired bilateral vestibular system loss, including factors affecting patient progress and final outcome.

Aminoglycosides↗

PubMed1998

Recovery nystagmus revisited.

Recovery nystagmus (RN) describes a spontaneous nystagmus with a fast-phase beating toward the ipsilesional ear. The mechanisms underlying RN implicate central vestibular system compensation processes. The presence of RN is significant because it implies that function has returned from the affected peripheral vestibular system. A case is described where RN was recorded. The processes underlying RN are described.

Acoustic Impedance Tests↗

PubMed1998

A screening version of the Dizziness Handicap Inventory (DHI-S).

OBJECTIVE: This study aimed to develop a screening version of the Dizziness Handicap Inventory (DHI). STUDY DESIGN: Three separate prospective investigations are reported that assess: 1) the equivalency of the screening version of DHI (DHI-S) for the DHI; 2) the test-retest reliability of the DHI-S; and 3) whether abnormal performance on balance function testing is associated with greater scores on the DHI-S. SETTING: The investigation was conducted in the Balance Function Laboratory of the Division of Audiology at Henry Ford Hospital, which is a tertiary care setting. PATIENTS: There were 281 consecutive patients (for investigations 1 and 2) and 45 consecutive patients (for investigation 3) seen for balance function testing. INTERVENTIONS: There was a 1-week interval between test and retest administrations of the DHI-S. MAIN OUTCOME MEASURES: Comparability of the DHI-S for the DHI and the test-retest reliability of the DHI-S were assessed with a Pearson Product-Moment correlation coefficient. Scores on the DHI-S for patients with and without abnormal balance function tests were assessed with an analysis of variance. RESULTS: Results showed that scores on the DHI-S had high comparability for the total score on the DHI (r=0.86). The short-term, test-retest reliability for the DHI was high (r=0.95). Abnormal performance on the sensory organization subtest of computerized dynamic posturography was associated with significantly greater scores on the DHI-S. CONCLUSIONS: Results support the contention that DHI-S is a psychometrically robust screening measure of self-perceived dizziness disability-handicap.

Activities of Daily Living↗

PubMed1995

Target-matched insertion gain derived from three different hearing aid selection procedures.

Three hearing aid selection procedures were compared to determine if any one was superior in producing prescribed real-ear insertion gain. For each of three subject groups, 12 in-the-ear style hearing aids with Class D circuitry and similar dispenser controls were ordered from one of three manufacturers. Subject groups were classified based on the type of information included on the hearing aid order form: (1) the subject's audiogram, (2) a three-part matrix specifying the desired maximum output, full-on gain, and frequency response slope of the hearing aid, or (3) the desired 2-cc coupler full-in grain of the hearing aid, based on real-ear coupler difference (RECD) measurements. Following electroacoustic adjustments aimed at approximating a commonly used target insertion gain formula, results revealed no significant differences among any of the three selection procedures with respect to obtaining acceptable insertion gain values.

Adult↗