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Baroreflex Sensitivity During Sleep in Infants: Impact of Sleeping Position and Sleep State

Overview
Journal Sleep
Specialty Psychiatry
Date 2011 Jun 2
PMID 21629360
Citations 11
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Abstract

Study Objectives: The prone sleeping position is a major risk for the sudden infant death syndrome (SIDS) and has been associated with lowered blood pressure and impaired blood pressure control. This study aimed to assess the effects of sleeping position, sleep state, and postnatal age on baroreflex control of heart rate.

Participants: Term infants (n = 31) were studied at 2-4 weeks, 2-3 months, and 5-6 months with daytime polysomnography.

Interventions: Blood pressure and heart rate were recorded during quiet (QS) and active (AS) sleep in both the supine and prone positions. In each condition, three 1-2 minute baseline measurements and three 15° head-up tilts were performed.

Measurements And Results: Baroreflex sensitivity (BRS) was assessed using cross-spectral analysis (BRS(SP)) and sequence analysis (BRS(SEQ)) in the baseline condition and with BRS(SP) during head-up tilting (BRS(SP) Tilt). BRS was usually lower prone compared to supine, reaching significance at 2-3 months (BRS(SP), P < 0.05; BRS(SP) Tilt, P < 0.05) and 5-6 months (BRS(SEQ), P < 0.05). BRS was lower in AS than QS supine at 5-6 months for all BRS estimates (P < 0.05). During QS, BRS increased with postnatal age in both sleeping positions (P < 0.05 for all BRS estimates); during AS, the postnatal age-related increase was limited to the prone position (BRS(SEQ), P < 0.05).

Conclusions: Sleeping position, sleep state and postnatal age all affect infant baroreflex function. Reduced BRS in the younger infants sleeping prone could increase the vulnerability to hypotensive events during sleep and thus play a vital role in conditions where circulatory failure may be involved, such as SIDS.

Citing Articles

Sudden Infant Death Syndrome: Risk Factors and Newer Risk Reduction Strategies.

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Effect of sleep position in term healthy newborns on sudden infant death syndrome and other infant outcomes: A systematic review.

Priyadarshi M, Balachander B, Sankar M J Glob Health. 2022; 12:12001.

PMID: 35838069 PMC: 9284601. DOI: 10.7189/jogh.12.12001.


Prone sleeping affects cardiovascular control in preterm infants in NICU.

Shepherd K, Wong F, Odoi A, Yeomans E, Horne R, Yiallourou S Pediatr Res. 2020; 90(1):197-204.

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Is prone sleeping dangerous for neonates? Polysomnographic characteristics and NDN gene analysis.

Wong S, Zhao L, Chuang S, Tsai W, Yu C, Tsai L Tzu Chi Med J. 2019; 31(2):113-117.

PMID: 31007492 PMC: 6450148. DOI: 10.4103/tcmj.tcmj_29_18.


Fetal-growth-restricted preterm infants display compromised autonomic cardiovascular control on the first postnatal day but not during infancy.

Cohen E, Wong F, Wallace E, Mockler J, Odoi A, Hollis S Pediatr Res. 2017; 82(3):474-482.

PMID: 28388597 DOI: 10.1038/pr.2017.105.


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