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Heart rate variability in cocaine-exposed newborn infants.

Abstract：

BACKGROUND:Infants born to cocaine-using mothers have a 3- to 8-fold increase in sudden infant death syndrome. Its underlying cause, in part, may be attributed to abnormal autonomic function. We proposed to study heart rate variability, reflecting autonomic control of the heart, in cocaine-exposed infants. METHODS:From 1997 to 2000, we studied 217 asymptomatic, term infants, of whom 68 had intrauterine cocaine exposure (group I). Their data were compared with infants exposed to drugs other than cocaine (group II, n = 77) and no drugs (group III, n = 72). Twenty-four-hour heart rate variability was measured within 72 hours of birth. RESULTS:Cocaine-exposed infants, as compared with the 2 control groups, had an overall significant decrease (P <.05) in global heart rate variability and a lower standard deviation of all valid N-N intervals in the recording (41.9 +/- 1.4 ms vs 47.6 +/- 1.3 ms and 46.9 +/- 1.3 ms, respectively). Vagal parameters such as high-frequency power and the square root of the mean of the squared differences between adjacent N-N intervals were also lower in newborns with heavy in utero cocaine exposure. CONCLUSIONS:Decreased heart rate variability was seen in cocaine-exposed infants. Whether low heart rate variability is a marker for increased risk of sudden death in infants (as it is in adults with structural heart disease) is unknown and requires further investigation.

journal_name

Am Heart J

journal_title

American heart journal

authors

Mehta SK,Super DM,Salvator A,Singer L,Connuck D,Fradley LG,Harcar-Sevcik RA,Kaufman ES

doi

10.1067/mhj.2001.118112

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

828-32

issue

5

eissn

0002-8703

issn

1097-6744

pii

S0002-8703(01)09439-X

journal_volume

142

pub_type

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