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Comparison of auditory brainstem responses and pneumograms in intensive care nursery infants.

Central slowing of auditory brainstem responses (ABRs) and excessive breathing irregularity on pneumogram recordings indicate dysfunction in central auditory pathways and brainstem respiratory control mechanisms, respectively. These centers are anatomically proximate within the brainstem so that ABR slowing and respiratory instability might be expected to occur concomitantly, reflecting overall dysfunction of this part of the central nervous system. To examine the relationship between these two assessments, testing results were compared for 15 infants in the intensive care nursery who had ABRs and 12-hour pneumograms performed at about the same age for separate clinical indications. Wave V latency at 70 dB was found to correlate significantly with three pneumogram measurements of breathing irregularity: the density of short apneas during sleep (p less than 0.01), the number of episodes of periodic breathing per 100 minutes of sleep (p less than 0.05), and the percentage of sleep time spent in periodic breathing (p less than 0.05). Interwave interval I-V correlated significantly with the density of short apneas during sleep (p less than 0.01). The auditory brainstem response and the pneumogram appeared to serve as related indicators of brainstem function in these infants.

Brain Stem↗

[Outcome of neonatal screening for hearing loss in neonatal intensive care unit and well-born nursery infants].

A newborn hearing screening was conducted on 319 neonatal intensive care unit (NICU) and 1200 well-born nursery (WBN) infants. Mean NICU birth weight was 1997 g and mean gestational age 34 weeks. Auditory brainstem response was studied in screening in NICU infants. Otoacoustic emission (OAE) or automated auditory brainstem response (AABR) was used in primary WBN screening. All infants not bilaterally passing hearing screening before discharge were recalled for outpatient retesting. If the outcome was still failure, ABR screening was conducted. The prevalence of infants diagnosed with hearing loss was 1.1% (16 of 1519). Of these 16, 75% were from the NICU and 75% were at risk for hearing loss. Mean age at hearing loss identification was 12.9 weeks in the WBN and mean age at hearing aid fitting was 16.1 weeks. Mean age at hearing aid fitting was lower for WBN than for NICU infants. Hearing loss identification and hearing aid fitting are thus feasible in NICU and WBN infants in universal newborn hearing screening.

Female↗

[The measurement of radon in kindergarten and infant nursery buildings in East-North Poland].

The measurements of radon concentration in 58 buildings of day nursery schools and kindergartens were performed in the six province of the East North Poland. The measurements of indoor radon were performed by means of a charcoal canister (Pico-Rad). The concentration ranged from 4.5 to 320 Bq/m3 and have arthimetic average 24.5 Bq/m3, geometric average 15.7 Bq/m3, median 15 Bq/m3. The highest average values were observed in Suwałki Province and Olsztyn Province. The results of all these measurements do not exceeded the limit of the Polish law.

Child Day Care Centers↗

Incidence of hearing loss in high risk and intensive care nursery infants.

The incidence of hearing impairment in high risk infants is summarized for five programs which use brainstem electric response audiometry (BERA) to detect hearing loss in this population. Programs are compared with respect to the following variables which may affect reported incidence figures: population characteristics, stimulus and recording parameters, criteria for failure on the initial BERA test, and follow-up protocols. Between 10-30% of these infants fail an initial BERA test, with initial failure rate largely dependent on the failure criteria used. Approximately 10% will continue to show some degree of hearing impairment on follow-up tests at 2-5 months of age. Between 2-4% will have a moderate to profound bilateral sensorineural hearing loss requiring amplification and habilitation.

Acoustic Stimulation↗