The relationship between tranepidermal water loss and humidity in very low birth weight infants

2.50
Hdl Handle:
http://hdl.handle.net/10755/166236
Category:
Abstract
Type:
Presentation
Title:
The relationship between tranepidermal water loss and humidity in very low birth weight infants
Author(s):
Krowchuk, Heidi
Author Details:
Heidi Krowchuk, PhD, Assistant Professor, University of North Carolina-Greensboro, School of Nursing, Greensboro, North Carolina, USA, email: heidi_krowchuk@uncg.edu
Abstract:
Water losses through the skin affect the thermal regulation and the fluid and electrolyte balance of very low birth weight (VLBW) infants. Disturbances of heat and water balance are pronounced in VLBW infants due to the increased permeability of their immature skin. Ambient humidity of the environment may be one factor contributing to TEWL; in studies with full-term infants, TEWL was negatively correlated with humidity measurements. The purpose of this study was to examine the relationship between transepidermal water loss (TEWL) and relative ambient humidity of the environment of VLBW infants during the first 9 days of life. A correlational design was used to examine this relationship, and the study was approved by the appropriate Institutional Review Boards prior to its conduct. fter written consent was obtained from the parents, 43 VLBW infants admitted consecutively to the Level RI Neonatal Intensive Care Unit over a six month period and who fulfilled the study criteria were enrolled. The sample consisted of 30 female and 13 male VLBW infants with a mean gestational age of 25.7 weeks (SD = 1.7) and a mean birth weight of 858.2 grams (SD = 200.3). All infants were enrolled in the study within 32 hours of birth (M = 16.8, SD = 6.0), and all infants were cared for in double-walled isolettes during the duration of the study. TEWL measurements were obtained from the subjects' abdominal skin, and ambient humidity measurements were obtained from inside subjects' isolettes (after a 10 minute period of equilibration) on 1, 3, 5, 7, and 9 days of life using an Evaporimeter (ServoMed, Stockholm), which is a valid and reliable instrument for determimng TEWL and ambient humidity. The Evaporimeter measures water evaporation from the skin within the range of 0 - 300g/m2h (grams per meter squared per hour), and relative humidity within the range of 0 - 100%. TEWL measurements over the nine days reflected maturation of the subjects' skin and ranged from 4 - 108g/m2h; measurements obtained on day 1 were the highest (M = 43.5, SD = 25.0), and the measurements on day 9 were the lowest (M = 15.6, SD = 5.4). Ambient humidity of the environment of the VLBW ranged from 22% to 86%; however, mean humidity measurements ranged from 35.8% (SD = 8.3) to 42.8% (SD = 17.5). The relationships between TEWL measurements and ambient humidity measurements from the 5 data collection points (days 1, 3, 5, 7, and 9) were calculated using the Pearson Correlation Coefficient. The tests revealed no statistically significant relationships. Further analyses revealed a statistically significant negative correlation between TEWL and the variables of gestational age (r = -0.53, p <.0001) and birth weight (r = -0.55, p <.0001). The results of this study demonstrate that ambient humidity was not related to TEWL in the VLBW infants in the sample; that is, TEWL was not increased by lower humidity levels. This has important practice implications, since ideal isolette humidity levels for VLBW infants have been thought to be about 50-70%. Further study needs to be done to determine if manipulating the ambient humidity effects the TEWL of VLBW infants.
Repository Posting Date:
27-Oct-2011
Date of Publication:
27-Oct-2011
Conference Date:
Feb 29 - Mar 2, 1996
Conference Host:
Southern Nursing Research Society
Note:
This is an abstract-only submission. If the author has submitted a full-text item based on this abstract, you may find it by browsing the Virginia Henderson Global Nursing e-Repository by author. If author contact information is available in this abstract, please feel free to contact him or her with your queries regarding this submission. Alternatively, please contact the conference host, journal, or publisher (according to the circumstance) for further details regarding this item. If a citation is listed in this record, the item has been published and is available via open-access avenues or a journal/database subscription. Contact your library for assistance in obtaining the as-published article.

Full metadata record

DC FieldValue Language
dc.type.categoryAbstracten_US
dc.typePresentationen_GB
dc.titleThe relationship between tranepidermal water loss and humidity in very low birth weight infantsen_GB
dc.contributor.authorKrowchuk, Heidien_US
dc.author.detailsHeidi Krowchuk, PhD, Assistant Professor, University of North Carolina-Greensboro, School of Nursing, Greensboro, North Carolina, USA, email: heidi_krowchuk@uncg.eduen_US
dc.identifier.urihttp://hdl.handle.net/10755/166236-
dc.description.abstractWater losses through the skin affect the thermal regulation and the fluid and electrolyte balance of very low birth weight (VLBW) infants. Disturbances of heat and water balance are pronounced in VLBW infants due to the increased permeability of their immature skin. Ambient humidity of the environment may be one factor contributing to TEWL; in studies with full-term infants, TEWL was negatively correlated with humidity measurements. The purpose of this study was to examine the relationship between transepidermal water loss (TEWL) and relative ambient humidity of the environment of VLBW infants during the first 9 days of life. A correlational design was used to examine this relationship, and the study was approved by the appropriate Institutional Review Boards prior to its conduct. fter written consent was obtained from the parents, 43 VLBW infants admitted consecutively to the Level RI Neonatal Intensive Care Unit over a six month period and who fulfilled the study criteria were enrolled. The sample consisted of 30 female and 13 male VLBW infants with a mean gestational age of 25.7 weeks (SD = 1.7) and a mean birth weight of 858.2 grams (SD = 200.3). All infants were enrolled in the study within 32 hours of birth (M = 16.8, SD = 6.0), and all infants were cared for in double-walled isolettes during the duration of the study. TEWL measurements were obtained from the subjects' abdominal skin, and ambient humidity measurements were obtained from inside subjects' isolettes (after a 10 minute period of equilibration) on 1, 3, 5, 7, and 9 days of life using an Evaporimeter (ServoMed, Stockholm), which is a valid and reliable instrument for determimng TEWL and ambient humidity. The Evaporimeter measures water evaporation from the skin within the range of 0 - 300g/m2h (grams per meter squared per hour), and relative humidity within the range of 0 - 100%. TEWL measurements over the nine days reflected maturation of the subjects' skin and ranged from 4 - 108g/m2h; measurements obtained on day 1 were the highest (M = 43.5, SD = 25.0), and the measurements on day 9 were the lowest (M = 15.6, SD = 5.4). Ambient humidity of the environment of the VLBW ranged from 22% to 86%; however, mean humidity measurements ranged from 35.8% (SD = 8.3) to 42.8% (SD = 17.5). The relationships between TEWL measurements and ambient humidity measurements from the 5 data collection points (days 1, 3, 5, 7, and 9) were calculated using the Pearson Correlation Coefficient. The tests revealed no statistically significant relationships. Further analyses revealed a statistically significant negative correlation between TEWL and the variables of gestational age (r = -0.53, p <.0001) and birth weight (r = -0.55, p <.0001). The results of this study demonstrate that ambient humidity was not related to TEWL in the VLBW infants in the sample; that is, TEWL was not increased by lower humidity levels. This has important practice implications, since ideal isolette humidity levels for VLBW infants have been thought to be about 50-70%. Further study needs to be done to determine if manipulating the ambient humidity effects the TEWL of VLBW infants.en_GB
dc.date.available2011-10-27T14:43:03Z-
dc.date.issued2011-10-27en_GB
dc.date.accessioned2011-10-27T14:43:03Z-
dc.conference.dateFeb 29 - Mar 2, 1996en_US
dc.conference.hostSouthern Nursing Research Societyen_US
dc.description.noteThis is an abstract-only submission. If the author has submitted a full-text item based on this abstract, you may find it by browsing the Virginia Henderson Global Nursing e-Repository by author. If author contact information is available in this abstract, please feel free to contact him or her with your queries regarding this submission. Alternatively, please contact the conference host, journal, or publisher (according to the circumstance) for further details regarding this item. If a citation is listed in this record, the item has been published and is available via open-access avenues or a journal/database subscription. Contact your library for assistance in obtaining the as-published article.-
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