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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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