Developmental characteristics of temporal sharp transients in the EEG of normal preterm and term newborns
OBJECTIVE: To describe developmental characteristics, morphological aspects and incidence of temporal sharp transients (TST) in normal preterm and term newborns at matched conceptional ages (CA). METHOD: Neonatal EEGs from two groups of normal newborns were evaluated in order to identify and charact...
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| Format: | Article |
| Language: | English |
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Academia Brasileira de Neurologia (ABNEURO)
2003-01-01
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| Series: | Arquivos de Neuro-Psiquiatria |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X2003000400009 |
| _version_ | 1811196038413811712 |
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| author | Nunes Magda Lahorgue Gameleira Fernando T. Oliveira Andréa J. Costa Jaderson Costa da |
| author_facet | Nunes Magda Lahorgue Gameleira Fernando T. Oliveira Andréa J. Costa Jaderson Costa da |
| author_sort | Nunes Magda Lahorgue |
| collection | DOAJ |
| description | OBJECTIVE: To describe developmental characteristics, morphological aspects and incidence of temporal sharp transients (TST) in normal preterm and term newborns at matched conceptional ages (CA). METHOD: Neonatal EEGs from two groups of normal newborns were evaluated in order to identify and characterize TST. Group I (n=40) consisted of newborns from 34 to 40 weeks of gestational age (GA) that were submitted to a single EEG between 24 and 48 hours of life. Group II consisted of 10 preterm newborns with GA between 30-32 weeks, followed with a weekly EEG until they reached term. Morphology of TST was divided in 3 groups (temporal sawtooth, isolated transients or repetitive transients). TST index, density and total number were calculated in each polysomnography and related to sleep stages and CA. Laterality (right/left) was also evaluated. The groups were compared at 34, 36, 38 and 40 weeks of CA. RESULTS: TST index and density decreased with the increase of CA in both groups (p<0.0001). The temporal sawtooth feature was registered in both groups only at 34 weeks. Although rare, repetitive and isolated TST were the most prevalent morphology between 36 - 40 weeks CA. Significant intragroup difference was observed in the comparison of TST density in REM and transitional sleep in GI. Moreover, isolated TST morphology was significant higher in GI at 34 weeks when compared to the others CA. No intragroup differences were observed on GII. No significant differences between the groups were observed considering TST number, index, density, morphology or laterality, at the matched CA. CONCLUSION: TST are normal features of neonatal EEG, as they are registered in normal newborns. Its incidence varies accordingly to morphology and they tend to disappear following the increase of CA. Temporal sawtooth appears more often in preterm newborns. Our results suggest that TST index, density and morphology variability may be a function of CA. |
| first_indexed | 2024-04-12T00:52:07Z |
| format | Article |
| id | doaj.art-13cbe9d08f9f496fbf1358153190b0e6 |
| institution | Directory Open Access Journal |
| issn | 0004-282X 1678-4227 |
| language | English |
| last_indexed | 2024-04-12T00:52:07Z |
| publishDate | 2003-01-01 |
| publisher | Academia Brasileira de Neurologia (ABNEURO) |
| record_format | Article |
| series | Arquivos de Neuro-Psiquiatria |
| spelling | doaj.art-13cbe9d08f9f496fbf1358153190b0e62022-12-22T03:54:42ZengAcademia Brasileira de Neurologia (ABNEURO)Arquivos de Neuro-Psiquiatria0004-282X1678-42272003-01-01613A574579Developmental characteristics of temporal sharp transients in the EEG of normal preterm and term newbornsNunes Magda LahorgueGameleira Fernando T.Oliveira Andréa J.Costa Jaderson Costa daOBJECTIVE: To describe developmental characteristics, morphological aspects and incidence of temporal sharp transients (TST) in normal preterm and term newborns at matched conceptional ages (CA). METHOD: Neonatal EEGs from two groups of normal newborns were evaluated in order to identify and characterize TST. Group I (n=40) consisted of newborns from 34 to 40 weeks of gestational age (GA) that were submitted to a single EEG between 24 and 48 hours of life. Group II consisted of 10 preterm newborns with GA between 30-32 weeks, followed with a weekly EEG until they reached term. Morphology of TST was divided in 3 groups (temporal sawtooth, isolated transients or repetitive transients). TST index, density and total number were calculated in each polysomnography and related to sleep stages and CA. Laterality (right/left) was also evaluated. The groups were compared at 34, 36, 38 and 40 weeks of CA. RESULTS: TST index and density decreased with the increase of CA in both groups (p<0.0001). The temporal sawtooth feature was registered in both groups only at 34 weeks. Although rare, repetitive and isolated TST were the most prevalent morphology between 36 - 40 weeks CA. Significant intragroup difference was observed in the comparison of TST density in REM and transitional sleep in GI. Moreover, isolated TST morphology was significant higher in GI at 34 weeks when compared to the others CA. No intragroup differences were observed on GII. No significant differences between the groups were observed considering TST number, index, density, morphology or laterality, at the matched CA. CONCLUSION: TST are normal features of neonatal EEG, as they are registered in normal newborns. Its incidence varies accordingly to morphology and they tend to disappear following the increase of CA. Temporal sawtooth appears more often in preterm newborns. Our results suggest that TST index, density and morphology variability may be a function of CA.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X2003000400009neonatal EEGtemporal sharp wavespreterm newbornsleep ontogenesis |
| spellingShingle | Nunes Magda Lahorgue Gameleira Fernando T. Oliveira Andréa J. Costa Jaderson Costa da Developmental characteristics of temporal sharp transients in the EEG of normal preterm and term newborns Arquivos de Neuro-Psiquiatria neonatal EEG temporal sharp waves preterm newborn sleep ontogenesis |
| title | Developmental characteristics of temporal sharp transients in the EEG of normal preterm and term newborns |
| title_full | Developmental characteristics of temporal sharp transients in the EEG of normal preterm and term newborns |
| title_fullStr | Developmental characteristics of temporal sharp transients in the EEG of normal preterm and term newborns |
| title_full_unstemmed | Developmental characteristics of temporal sharp transients in the EEG of normal preterm and term newborns |
| title_short | Developmental characteristics of temporal sharp transients in the EEG of normal preterm and term newborns |
| title_sort | developmental characteristics of temporal sharp transients in the eeg of normal preterm and term newborns |
| topic | neonatal EEG temporal sharp waves preterm newborn sleep ontogenesis |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X2003000400009 |
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