High frequency immittance findings: Newborn versus six-week-old infants

Mazlan, Rafidah; Kei, Joseph; Hickson, Louise; Stapleton, Catherine; Grant, Stephanie; Lim, Sharyn; Linning, Ron; Gavranich, John

doi:10.1080/14992020701525858

Cited by 39 publications

(58 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the analysis of acoustic reflex, studying thresholds in healthy newborns (Figures 1 and 2), the specificity was also 100% for the 1,000, 2,000, and 4,000 Hz with the 1,000 Hz probe. The occurrence (100%) in the presence of AR in Group I is higher than that found in two studies -97.6% (22) and 91.3% (10) . On the other hand, the percentage of the presence of response in the group with risk indicators (Group II) for the 1,000 Hz probe (Figure 2) ranged from 79% (500 Hz) to 93% (4,000 Hz).…”

Section: Discussioncontrasting

confidence: 46%

“…The occurrence of acoustic reflex at 50, 55, or 60 dB was higher with the 1,000 Hz probe. Lower ASRTs were also found (10,21,22) and were justified by the small size of the external auditory canal of newborns by vibration of the wall of the canal after a sound stimulus. However, it is worth to mention that the minimum intensity for the analysis of AR in the equipment is 50 dB NPS.…”

Section: Discussionmentioning

confidence: 90%

“…With the 1,000 Hz probe, the average was 74.2 dB for the 1,000 Hz frequency and 62.9 dB for 2,000 Hz (Table 1). A study (21) found a mean of 93 dB for the 1,000 Hz and two other studies (10,22) found means of 73.05 and 76.2 dB for 1,000 and 2,000 Hz, respectively. In the these studies, no other frequencies were analyzed.…”

Section: Discussionmentioning

confidence: 99%

“…Based on this criterion, they found out that 94% of the ears had a mean acoustic Minimum 60 65 50 65 55 50 50 50 60 70 70 60 50 65 50 50 Maximum 95 100 100 100 95 95 95 95 100 100 95 90 100 100 100 100 5th percentile 65 65 50 65 60 50 50 50 60 70 70 60 50 65 55 50 95th percentile 95 100 100 100 95 95 85 90 100 100 95 90 100 100 95 reflex threshold of 93 dB and 90% between 80 and 105 dB HL. Similarly, however, with pure tone stimuli of 2 kHz and broadband noise, a study (22) detected the presence of acoustic reflex (AR) in 97.6% of 42 normal newborns, with mean ASRT of 76.2 (±7.9) for the 2 kHz frequency and 64.9 (±7.8) for the broadband noise, respectively. Even though the results of these studies provide useful clinical information, they are restricted to the analysis of ASRT in only one frequency, or with broadband stimulus.…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Acoustic reflex on newborns: the influence of the 226 and 1,000 Hz probes

Jacob-Corteletti

Duarte

Zucki

et al. 2015

CoDAS

View full text Add to dashboard Cite

PURPOSE: To analyze the occurrence of acoustic reflex and its threshold on newborns using the 226 and 1,000 Hz probes. METHODS: Thirty-six newborns with "PASS" results in newborn hearing screening and tympanogram with one or two peaks for both probe tones were included. Group I comprised 20 full-term newborns without risk indicator for hearing loss, and Group II comprised 16 newborns with at least one risk indicator. The study about ipsilateral acoustic reflex thresholds was conducted in 500, 1,000, 2,000, and 4,000 Hz. RESULTS: The groups presented the acoustic reflex thresholds between 50 and 100 dB for both probe tones. In the comparison between the probes, there were differences in all frequencies evaluated in Group I, with the lowest threshold mean for the 1,000 Hz probe. In Group II, differences were detected at 2,000 Hz. The mean acoustic reflex thresholds were similar in both groups for the 226 Hz probe. There was a difference for the 1,000 Hz probe in all tested frequencies. The percentage of response was higher in both groups for the 1,000 Hz probe. The kappa test showed extremely poor agreement in the comparison of results between both probes. CONCLUSION: The occurrence of acoustic reflex was higher in newborns and its thresholds were lower with the 1,000 Hz probe both for healthy newborns and for newborns at risk.

show abstract

Section: Discussioncontrasting

confidence: 46%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Acoustic reflex on newborns: the influence of the 226 and 1,000 Hz probes

Jacob-Corteletti

Duarte

Zucki

et al. 2015

CoDAS

View full text Add to dashboard Cite

show abstract

“…Em 1000Hz, a literatura apresenta grande variabilidade, sendo apresentados valores superiores (25) e inferiores (20,38) ao deste estudo, sendo a média em torno de 1,5mmho (12,19,26,32).…”

Section: Discussionunclassified

Timpanometria em lactentes utilizando sonda multifrequencial

Moraes¹,

Macedo²,

Feniman³

2012

Arq Int Otorrinolaringol

View full text Add to dashboard Cite

SUMMARYIntroduction: The use of conventional tympanometry is not sufficiently sensitive to detect all cases of middle ear changes, and this hinders accurate diagnosis. Objective: To characterize acoustic immittance measures of infants from 0 to 3 months of age using multifrequency tympanometry in a prospective study. Method: 54 infants from 0 to 3 months of age were evaluated. The inclusion criteria included absence of respiratory infections during the evaluation, presence of transient evoked otoacoustic emissions, and absence of risk indicators for hearing loss. The subjects were evaluated by an audiologic interview, a visual inspection of the ear canal, and measures of acoustic immittance at the frequencies of 226 Hz, 678 Hz, and 1,000 Hz. Tympanometric records of the occlusion effect, tympanometric curve type, tympanometric peak pressure, equivalent ear canal volume, and peak compensated static acoustic admittance were collected. Results: The results indicated the presence of an occlusion effect (2.88% at 226 Hz, 4.81% at 678 Hz and 3.85% at 1,000 Hz), predominance of a tympanometric curve with a single peak (65.35% at 226 Hz, 81.82% at 678 Hz, and 77.00% at 1,000 Hz), and tympanometric peak pressure ranging from -155 to 180 daPa. Further, the equivalent ear canal volume increased with the frequency of the probe (0.64 mL at 226 Hz, 1.63 mho at 678 Hz, and 2.59 mmho at 1,000 Hz) and the peak compensated static acoustic admittance values increased with an increase in frequency (0.51 mL at 226 Hz, 0.55 mmho at 678 Hz and 1.20 mmho at 1,000 Hz). 93.06% of the tympanograms were classified as normal at 226 Hz, 81.82% at 678 Hz, and 77.00 % at 1,000 Hz, respectively. Conclusion: Taken together, these results demonstrated that utilizing these evaluations made it possible to characterize the acoustic immittance measures of infants.

show abstract

Quantification of the Stapedial Reflex Reveals Delayed Responses in Autism

Lukose

Brown

Barber³

et al. 2013

Autism Research

View full text Add to dashboard Cite

Autism is a developmental disorder characterized, in part, by sensory abnormalities. It is well established that most if not all patients with autism have problems with auditory processing, ranging from deafness to hyperacusis, and physiological testing of auditory function (i.e. auditory brain stem responses) implicates brain stem dysfunction in autism. Additionally, previous research from this lab has revealed significantly fewer auditory brain stem neurons in autistic subjects as young as 2 years of age. These observations have led us to hypothesize that objective, noninvasive measures of auditory function can be used as an early screening tool to identify neonates with an elevated risk of carrying a diagnosis of autism. Here, we provide a detailed quantitative investigation of the acoustic stapedial reflex (ASR), a three- or four-neuron brain stem circuit, in young autistic subjects and normal developing controls. Indeed, we find significantly lower thresholds, responses occurring at significantly longer latency and right-left asymmetry in autistic subjects. The results from this investigation support deficits in auditory function as a cardinal feature of autism and suggest that individuals with autism can be identified by their ASR responses.

show abstract

High frequency immittance findings: Newborn versus six-week-old infants

Cited by 39 publications

References 39 publications

Acoustic reflex on newborns: the influence of the 226 and 1,000 Hz probes

Acoustic reflex on newborns: the influence of the 226 and 1,000 Hz probes

Timpanometria em lactentes utilizando sonda multifrequencial

Quantification of the Stapedial Reflex Reveals Delayed Responses in Autism

Contact Info

Product

Resources

About