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- W1983302208 abstract "Background/Aim: The Apgar score has been widely used as an indicator of immediate newborn condition to guide appropriate delivery room management and intervention. It is not clear whether the neonate who have low Apgar score and do not demonstrate clinical signs of hypoxic-ischaemic encephalopathy (HIE) have any degree of brain damage. We have previously found no abnormalities in conventional brainstem auditory evoked response (BAER) in these neonates. However, we cannot exclude some possible abnormalities in the brainstem that cannot be shown by conventional BAER but may be revealed by a relatively new technique–the maximum length sequence (MLS) BAER, which can present acoustic stimuli at much higher rates than is possible using conventional BAER. Methods: The study group included 34 term infants who had low Apgar score (1 min ≤7 and 10 min ≥8) but no clinical signs of HIE. Normal controls were 38 healthy term infants without any perinatal problems. MLS BAER was serially recorded on day 1, 3, 5, and 7 and 1 month after birth in the study group and on day 1–3 and 1 month in the controls. The click stimuli to elicit MLS BAER were presented at 91–910/sec and 40 dB above the BAER threshold of each subjects. Results: No significant differences in wave I and III latencies were found between the study and controls groups at any repetition rates of clicks (91–910/sec) on any day studied. Wave V latency in the study group did not differ significantly from the normal controls at 91–455/sec on any day, but increased significantly at 910/sec on day 1 (ANOVA p < 0.01). The increase in I–V interval with the increase in click rate was slightly more in the study group than in the controls on day 1 and 3. The interval increased significantly at 455/sec and 910/sec on day 1 (p < 0.01 and 0.001, respectively) and day 3 (p < 0.05 and 0.01). Similar changes were found in I–III and III–V intervals. From day 5, wave III and V latencies and the I–V interval decreased slightly at all rates of clicks. On day 5, 7, and 1 month, none of the MLS BAER latencies and intervals differed from the controls. No systematic abnormalities were seen in V/I and V/III amplitude ratios during the first month after birth. Conclusions: During the first 3 days of life there is sub-optional brainstem auditory function in neonates who have low Apgar score but no HIE, which can only be revealed at very high rates of clicks in MLS BAER. Thereafter, the function returns to normal. The findings suggest that such neonates have short-term sub-clinical neural impairment after birth." @default.
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- W1983302208 date "2004-09-01" @default.
- W1983302208 modified "2023-10-16" @default.
- W1983302208 title "122 Neonates with Low Apgar Score but without Hypoxic-Ischaemic Encephalopathy: Sub-Optimal Brainstem Function" @default.
- W1983302208 doi "https://doi.org/10.1203/00006450-200409000-00145" @default.
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