North Dakota Nurse - April 2021
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<strong>April</strong>, May, June <strong>2021</strong> The <strong>North</strong> <strong>Dakota</strong> <strong>Nurse</strong> Page 9<br />
Noise Reduction in NICU Patients<br />
Appraised By:<br />
Kelsie Gustin SN, Heidi Hilz SN, Lisa Wentz SN,<br />
Kaitlynn Fuhrmann SN, and Katherine German<br />
SN (NDSU School of Nursing at Sanford Bismarck)<br />
Allison Sadowsky MSN, RN Assistant Professor<br />
of Practice (Faculty)<br />
Clinical Question:<br />
- Does noise reduction/quiet environment<br />
influence the overall health status of NICU<br />
patients during their stay in the NICU?<br />
Sources of Evidence:<br />
Abdeyazdan, Z., Ghasemi, S., Marofi, M., & Berjis,<br />
N. (2014). Motor Responses and Weight<br />
Gaining in Neonates through Use of Two<br />
Methods of Earmuff and Receiving Silence in<br />
NICU. The Scientific World Journal, 2014, 1-5.<br />
doi:10.1155/2014/864780<br />
Abdeyazdan, Z., Ghassemi, S., & Marofi, M. (2014).<br />
The effects of earmuff on physiologic and motor<br />
responses in premature infants admitted in<br />
neonatal intensive care unit. Iranian journal of<br />
nursing and midwifery research, 19(2), 107–112.<br />
Casavant, S. G., Bernier, K., Andrews, S., & Bourgoin,<br />
A. (2017). Noise in the Neonatal Intensive Care<br />
Unit: What Does the Evidence Tell Us? Advances<br />
in Neonatal Care, 17(4), 265-273.<br />
Khalesi, N., Khosravi, N., Ranjbar, A., Godarzi, Z., &<br />
Karimi, A. (2017). The effectiveness of earmuffs<br />
on the physiologic and behavioral stability<br />
in preterm infants. International Journal of<br />
Pediatric Otorhinolaryngology, 98, 43-47.<br />
doi:10.1016/j.ijporl.2017.04.028<br />
Smith, S., Ortmann, A., & Clark, W. (2018). Noise in the<br />
neonatal intensive care unit: A new approach to<br />
examining acoustic events. Retrieved October<br />
25, 2020, from https://www.ncbi.nlm.nih.gov/<br />
pmc/articles/PMC6122266<br />
Synthesis of Evidence:<br />
Five articles were reviewed as evidence in<br />
this report. A thorough review was conducted<br />
resulting in three randomized control trials, one<br />
correlational study, and one systematic review<br />
relevant to the clinical question. Compared<br />
to the intrauterine environment, the NICU<br />
is an excessively complex and noise-filled<br />
environment. The immature auditory systems in<br />
preterm infants make them highly susceptible<br />
to excess noise, which can negatively affect<br />
their ability to self-regulate. This inability to<br />
self-regulate the body can lead to prolonged<br />
ventilation, apnea, sleep disturbances, changes<br />
in respiratory and heart rates, and nutritional<br />
requirements. Furthermore, the excessive noises<br />
prevalent in the NICU setting have shown to<br />
be negatively impactful on preterm infant’s<br />
developmental and health statuses.<br />
In the first study by Abdeyazdan, Z.,<br />
Ghassemi, S., & Marofi, M. (2014) a randomized<br />
control trial was conducted. This study showed<br />
the effects between earmuffs and silence<br />
versus normal routine cares, and how those<br />
interventions affected preterm infant’s weight<br />
gain and motor responses. 108 preterm infants<br />
who stayed in the NICU were included in the<br />
study. There were 12 total dropouts due to<br />
discharges and apnea spells. Infants were<br />
placed into the three different groups by a<br />
coin toss. Silence hours and earmuffs were<br />
implemented from 9-11 am, 4-6pm and 11pm-<br />
5am as well as during routine cares. The study<br />
concluded that implementation of both silence<br />
hours and earmuffs were effective in increasing<br />
weight gain and decreasing motor responses in<br />
preterm infants in the NICU.<br />
The second study by Abdeyazdan, Z.,<br />
Ghassemi, S., & Marofi, M. (2014) was a<br />
randomized control trial. The study was<br />
conducted to examine the effects of earmuffs<br />
on the physiologic and motor responses of<br />
premature infants in the NICU. The study<br />
consisted of 64 premature infants who were<br />
randomly assigned to study and control<br />
groups. Within the study group there were 22<br />
males and 10 females, and within the control<br />
group there were 19 males and 13 females.<br />
The study group’s intervention consisted of<br />
wearing earmuffs from 9:00am-11:00am and<br />
4:00-6:00pm along with routine treatments<br />
and care. The control group received only<br />
routine treatments and care. The results of the<br />
study concluded that the use of earmuffs on<br />
premature infants during the morning and<br />
afternoon periods improves physiologic and<br />
motor responses, including increased arterial<br />
O2 saturations, decreased heart and respiratory<br />
rates, and decreased motor responses.<br />
The study by Khalesi, N., Khosravi, N., Ranjbar,<br />
A., Godarzi, Z., & Karimi, A. (2017) was a crossed<br />
over controlled trial. The study was conducted<br />
at Aliasghar Hospital (Tehran, Iran) in 2014.<br />
Thirty-six preterm infants who were cared for in<br />
closed incubators were assigned to group A<br />
or B. On the first day group “A” wore a pair of<br />
silicon earmuffs while group “B” wore nothing.<br />
On the second day the groups switched, and<br />
group “B” wore the earmuffs while “A” wore<br />
nothing. During the two consecutive days, all<br />
subjects were observed as their own controls<br />
(without earmuffs). Throughout the study<br />
physiologic (body temperature, heart rate,<br />
respiratory rate, systolic, diastolic pressures,<br />
arterial oxygen saturation) and behavioral<br />
responses (according to the Anderson<br />
Behavioral State Scoring System) were assessed<br />
every two hours from 8am-4pm for the two<br />
consecutive days. The results showed that the<br />
application of earmuffs could decrease heart<br />
and respiratory rate while also increasing the<br />
amount of oxygen saturation.<br />
Smith, S., Ortmann, A., & Clark, W. (2018)<br />
conducted a correlational study, to see if<br />
reducing the noise in the neonatal intensive<br />
care unit had an effect on the infants. The<br />
study was conducted in a level IV NICU at St.<br />
Louis Children’s Hospital, which included three<br />
critically ill infants. Two infants were placed in<br />
a shared room, and the third infant was in a<br />
private room. A Greenwhich Mean Time (GMT)<br />
synced clock was used to track the onset<br />
and duration of the acoustic events. Different<br />
sound levels were tested at various times and<br />
the infants physiological state was assessed by<br />
their heart rate and oxygenation status. Several<br />
times there were changes in the heart rate<br />
during an acoustic event. However, respiratory<br />
responses were inconsistent. The infants did<br />
have large disturbances when the acoustic<br />
environment was stable, however the patients<br />
are critically ill they are more easily susceptible<br />
for physiological changes. Both baby B (in an<br />
open room) and C (in a private room) showed<br />
significant physiological changes during<br />
acoustic events but baby A (in an open room)<br />
remained stable. The results showed that noise<br />
does overall effect the physiological state of the<br />
infant, by decreasing the noise levels the infants<br />
physiological state would remain relatively<br />
stable.<br />
Casavant, Bernier, and Andrews (2017)<br />
looked at twenty different studies comparing<br />
noise reduction measures within the NICU<br />
setting. They searched four different databases:<br />
ScienceDirect, PubMed, CINAHL, as well as the<br />
Cochrane Database of Systematic Reviews.<br />
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The studies that were included in the review<br />
consisted of NICU departments that were level<br />
three (respiratory support, intravenous fluids,<br />
and care for babies born 28 weeks or greater),<br />
or above, as well as neonates having been<br />
born before 32 weeks gestational age at birth.<br />
The studies that were conducted found that<br />
education and awareness to staff was a crucial<br />
aspect of decreasing noise levels as well as the<br />
need to implement these interventions in order<br />
to promote neonatal neurodevelopment and<br />
growth.<br />
Conclusions:<br />
Critically ill infants in the neonatal intensive<br />
care unit (NICU) go through extensive amounts<br />
of stress and physiological changes as they<br />
are developing. Excessive environmental<br />
changes can impact the infants and cause<br />
stress; there are various strategies to decrease<br />
environmental stressors such as excessive<br />
noise. Through the use of earmuffs on infants<br />
in the NICU for a minimum of two hours in the<br />
morning and afternoon periods, significant<br />
improvements in both physiological and<br />
motor responses can be made. In addition,<br />
making an effort to minimize preventable<br />
noises from the nurses working in the NICU and<br />
implementing “quiet time” periods can improve<br />
infant physiologic responses as well. Although<br />
eliminating all noises is not possible, as some<br />
are emergency alarms, reducing the amount of<br />
added noise is beneficial.<br />
Implications for Nursing Practice:<br />
Specific techniques that can be implemented<br />
to reduce the effects of noise on NICU patients<br />
would include earmuffs, quiet time periods,<br />
private rooms, clustering cares, and decreasing<br />
traffic through patient rooms. By decreasing the<br />
amount of noise, it can reduce an infant’s stress<br />
response and improve their overall health status<br />
during their stay in the NICU, therefore, benefiting<br />
the patient.<br />
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