Analysis of Heart Period Power in Ventilated Very-Low-Birthweight (VLBW) Infants Employing Growth Curve Techniques

2.50
Hdl Handle:
http://hdl.handle.net/10755/150780
Type:
Presentation
Title:
Analysis of Heart Period Power in Ventilated Very-Low-Birthweight (VLBW) Infants Employing Growth Curve Techniques
Abstract:
Analysis of Heart Period Power in Ventilated Very-Low-Birthweight (VLBW) Infants Employing Growth Curve Techniques
Conference Sponsor:Sigma Theta Tau International
Conference Year:2004
Conference Date:July 22-24, 2004
Author:Smith, Sandra, PhD, APRN
P.I. Institution Name:University of Utah
Title:Assistant Professor
Co-Authors:Alexa Doig, RN, MS
Background and Objectives: Heart period variability (HPV) is a sensitive measure of the balance between the parasympathetic and sympathetic branches of the autonomic nervous system (ANS) and is useful for determining an infant’s ability to adapt to external events. Spectral analysis of HPV provides a measure of high-frequency (HF) power representing parasympathetic tone and low-frequency (LF) power representing primarily sympathetic tone. The objectives of this project were to (1) identify normative characteristics of HF and LF power and (2) categorize patterns of intraindividual variability of HF and LF power over time. Design and Variables: A secondary analysis of data derived from an experimental study comparing infant physiologic response to incubator care versus maternal holding was conducted. The original study was a two group crossover design with interrupted time series data collection. HF and LF power measured in ms2 were analyzed. Sample: HPV data were collected from 16 mechanically ventilated VLBW infants in a metropolitan neonatal intensive care unit in the US. Infant mean corrected gestational age was 30.4 weeks (+/- 1.5), mean weight was 983.8 grams (+/- 209.7). Analysis: Measures of central tendency and dispersion for HF and LF power were analyzed. Individual growth curve analyses are being generated to determine the pattern of change in ANS balance over time. Findings: Mean HF power ranged from 5.13ms2 (+/- 2.85) to 6.83ms2 (+/-3.48) and mean LF power ranged from: 33.88ms2 (+/- 33.57) to 50.97ms2 (+/- 42.53) by gestational age groups. Results from the growth curve analyses will also be presented. Implications: HPV may be a useful indicator of ANS maturation and response to environmental stressors. These findings will contribute to the body of knowledge of HPV and will serve as pilot data for a study of tailored interventions to promote parasympathetic maturation, growth, and restoration in these fragile infants.
Repository Posting Date:
26-Oct-2011
Date of Publication:
22-Jul-2004
Sponsors:
Sigma Theta Tau International

Full metadata record

DC FieldValue Language
dc.typePresentationen_GB
dc.titleAnalysis of Heart Period Power in Ventilated Very-Low-Birthweight (VLBW) Infants Employing Growth Curve Techniquesen_GB
dc.identifier.urihttp://hdl.handle.net/10755/150780-
dc.description.abstract<table><tr><td colspan="2" class="item-title">Analysis of Heart Period Power in Ventilated Very-Low-Birthweight (VLBW) Infants Employing Growth Curve Techniques</td></tr><tr class="item-sponsor"><td class="label">Conference Sponsor:</td><td class="value">Sigma Theta Tau International</td></tr><tr class="item-year"><td class="label">Conference Year:</td><td class="value">2004</td></tr><tr class="item-conference-date"><td class="label">Conference Date:</td><td class="value">July 22-24, 2004</td></tr><tr class="item-author"><td class="label">Author:</td><td class="value">Smith, Sandra, PhD, APRN</td></tr><tr class="item-institute"><td class="label">P.I. Institution Name:</td><td class="value">University of Utah</td></tr><tr class="item-author-title"><td class="label">Title:</td><td class="value">Assistant Professor</td></tr><tr class="item-email"><td class="label">Email:</td><td class="value">sandra.smith@nurs.utah.edu</td></tr><tr class="item-co-authors"><td class="label">Co-Authors:</td><td class="value">Alexa Doig, RN, MS</td></tr><tr><td colspan="2" class="item-abstract">Background and Objectives: Heart period variability (HPV) is a sensitive measure of the balance between the parasympathetic and sympathetic branches of the autonomic nervous system (ANS) and is useful for determining an infant&rsquo;s ability to adapt to external events. Spectral analysis of HPV provides a measure of high-frequency (HF) power representing parasympathetic tone and low-frequency (LF) power representing primarily sympathetic tone. The objectives of this project were to (1) identify normative characteristics of HF and LF power and (2) categorize patterns of intraindividual variability of HF and LF power over time. Design and Variables: A secondary analysis of data derived from an experimental study comparing infant physiologic response to incubator care versus maternal holding was conducted. The original study was a two group crossover design with interrupted time series data collection. HF and LF power measured in ms2 were analyzed. Sample: HPV data were collected from 16 mechanically ventilated VLBW infants in a metropolitan neonatal intensive care unit in the US. Infant mean corrected gestational age was 30.4 weeks (+/- 1.5), mean weight was 983.8 grams (+/- 209.7). Analysis: Measures of central tendency and dispersion for HF and LF power were analyzed. Individual growth curve analyses are being generated to determine the pattern of change in ANS balance over time. Findings: Mean HF power ranged from 5.13ms2 (+/- 2.85) to 6.83ms2 (+/-3.48) and mean LF power ranged from: 33.88ms2 (+/- 33.57) to 50.97ms2 (+/- 42.53) by gestational age groups. Results from the growth curve analyses will also be presented. Implications: HPV may be a useful indicator of ANS maturation and response to environmental stressors. These findings will contribute to the body of knowledge of HPV and will serve as pilot data for a study of tailored interventions to promote parasympathetic maturation, growth, and restoration in these fragile infants.</td></tr></table>en_GB
dc.date.available2011-10-26T10:42:40Z-
dc.date.issued2004-07-22en_GB
dc.date.accessioned2011-10-26T10:42:40Z-
dc.description.sponsorshipSigma Theta Tau Internationalen_GB
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