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[Effects of lead exposure on their brain-stem auditory evoked potential in children]
1National Center for Maternal and Infant Health, Beijing Medical University, Beijing 100083.
Insights
Even low lead exposure can negatively impact children's auditory development. Higher blood lead levels correlate with prolonged brain-stem auditory evoked potentials (BAEP) latencies, indicating slower auditory processing.
Area of Science:
- Neuroscience
- Environmental Health
- Pediatrics
Context:
- Lead exposure is a significant public health concern, particularly for children.
- Auditory development is crucial for cognitive and language acquisition.
- The effects of low-level lead exposure on auditory pathways are not fully understood.
Purpose:
- To investigate the relationship between low blood lead levels and auditory development in children.
- To compare brain-stem auditory evoked potentials (BAEP) in children with low versus high blood lead concentrations.
Summary:
- Children were categorized into low (< 0.483 micromol/L) and high (>= 0.483 micromol/L) blood lead groups.
- Atomic spectrophotometry (AAS) measured blood lead levels.
- Brain-stem auditory evoked potentials (BAEP) latencies and intervals were analyzed, revealing longer latencies and intervals in the high lead group.
- A positive correlation was observed between blood lead levels and specific BAEP waves (III, V) and intervals (I-V).
Impact:
- Elevated blood lead levels are associated with prolonged BAEP latencies and interpeak intervals.
- This suggests a slowdown in auditory nerve conduction velocity.
- Low-level lead exposure can adversely affect auditory development in children.
Objective:
To determine if low lead exposure can influence auditory development in children.
Methods:
Children were divided into two groups, i.e., low (< 0.483 micromol/L) and high (>or= 0.483 micromol/L) blood lead levels with atomic spectrophotometry (AAS). Latencies and latent intervals between peak waves of their brain-stem auditory evoked potentials (BAEP) in the two groups were measured and compared.
Results:
There was positive correlation between blood lead levels and BAEP in wave III at right ear, wave V at both right and left ears and latent intervals between peak waves I to V, with correlation coefficients of 0.2991, 0.2748, 0.3248, 0.2064 and 0.2412, respectively. There was significant difference in latencies of wave III at right ear, wave V at both right and left ears and latent intervals between peak waves I to V at both right and left ears and those between waves of III to V at right ear in the low blood lead group. Latencies and latent intervals between peak waves were longer in the high blood level group (with a mean of 0.78 micromol/L and a range of 0.58 to 1.42 micromol/L) than those in the low one (with a mean of 0.30 micromol/L and a range of 0.17 to 0.45 micromol/L).
Conclusion:
Elevated blood lead level could cause prolongation of latencies and latent intervals between peak waves of BAEP and slowdown of the nerve conduction velocity, and so auditory development was influenced.