Respiratory Distress in the Newborn
CHRISTIAN L. HERMANSEN, MD, and KEVIN N. LORAH, MD
Lancaster General Hospital, Lancaster, Pennsylvania
T
he clinical presentation of respira-
tory distress in the newborn includes
apnea, cyanosis, grunting, inspira-
tory stridor, nasal flaring, poor feed-
ing, and tachypnea (more than 60 breaths per
minute). There may also be retractions in the
intercostal, subcostal, or supracostal spaces.
Respiratory distress occurs in approximately
7 percent of infants,
1
and preparation is cru-
cial for physicians providing neonatal care.
Most cases are caused by transient tachypnea
of the newborn, respiratory distress syndrome,
or meconium aspiration syndrome, but vari-
ous other causes are possible (Table 1).
Transient Tachypnea of the Newborn
Transient tachypnea of the newborn is the
most common cause of neonatal respira-
tory distress, constituting more than 40 per-
cent of cases.
1
A benign condition, it occurs
when residual pulmonary fluid remains in
fetal lung tissue after delivery. Prostaglandins
released after delivery dilate lymphatic vessels
to remove lung fluid as pulmonary circula-
tion increases with the first breath. When
fluid persists despite these mechanisms, tran-
sient tachypnea of the newborn can result.
Risk factors include maternal asthma,
2
male
sex, macrosomia, maternal diabetes,
3
and
cesarean delivery.
4
The clinical presentation includes tachypnea
immediately after birth or within two hours,
with other predictable signs of respiratory
The most common etiology of neonatal respiratory distress is transient tachypnea of the
newborn; this is triggered by excessive lung fluid, and symptoms usually resolve spontane-
ously. Respiratory distress syndrome can occur in premature infants as a result of surfactant
deficiency and underdeveloped lung anatomy. Intervention with oxygenation, ventilation, and
surfactant replacement is often necessary. Prenatal administration of corticosteroids between
24 and 34 weeks’ gestation reduces the risk of respiratory distress syndrome of the newborn
when the risk of preterm delivery is high. Meconium aspiration syndrome is thought to occur
in utero as a result of fetal distress by hypoxia. The incidence is not reduced by use of amnio-
infusion before delivery nor by suctioning of the infant during delivery. Treatment options are
resuscitation, oxygenation, surfactant replacement, and ventilation. Other etiologies of respira-
tory distress include pneumonia, sepsis, pneumothorax, persistent pulmonary hypertension,
and congenital malformations; treatment is disease specific. Initial evaluation for persistent or
severe respiratory distress may include complete blood count with differential, chest radiog-
raphy, and pulse oximetry. (Am Fam Physician 2007;76:987-94. Copyright © 2007 American
Academy of Family Physicians.)
Table 1. Differential Diagnosis of
Respiratory Distress in the Newborn
Most common causes*
Transient tachypnea of the newborn
Respiratory distress syndrome (hyaline membrane
disease)
Meconium aspiration syndrome
Less common but significant causes
Delayed transition
Infection (e.g., pneumonia, sepsis)
Nonpulmonary causes (e.g., anemia, congenital
heart disease, congenital malformation,
medications, neurologic or metabolic
abnormalities, polycythemia, upper airway
obstruction)
Persistent pulmonary hypertension of the
newborn
Pneumothorax
*—Listed in order of incidence.
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988
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distress. Symptoms can last from a few hours
to two days. Chest radiography shows diffuse
parenchymal infiltrates, a “wet silhouette”
around the heart, or intralobar fluid accu-
mulation
5
(Figure 1).
Respiratory Distress Syndrome
Respiratory distress syndrome of the newborn,
also called hyaline membrane disease, is the
most common cause of respiratory distress in
premature infants, correlating with structural
and functional lung immaturity. It occurs in
24,000 infants born in the United States annu-
ally.
6
It is most common in infants born at
fewer than 28 weeks’ gestation and affects one
third of infants born at 28 to 34 weeks’ gesta-
tion, but occurs in less than 5 percent of those
born after 34 weeks’ gestation.
6
The condition
is more common in boys,
7
and the incidence is
approximately six times higher in infants whose
mothers have diabetes, because of delayed pul-
monary maturity despite macrosomia.
8
The pathophysiology is complex. Immature
type II alveolar cells produce less surfactant,
causing an increase in alveolar surface ten-
sion and a decrease in compliance. The resul-
tant atelectasis causes pulmonary vascular
constriction, hypoperfusion, and lung tissue
ischemia. Hyaline membranes form through
the combination of sloughed epithelium,
protein, and edema. Persistent respiratory
distress syndrome leads to bronchopulmo-
nary dysplasia, characterized by typical chest
radiography findings and chronic oxygen
dependence. The syndrome is associated with
recurrent wheezing in children and a higher
risk of hospital admission for asthma.
9
The diagnosis of respiratory distress syn-
drome should be suspected when grunting,
retractions, or other typical distress symp-
toms occur in a premature infant immedi-
ately after birth. Hypoxia and cyanosis often
occur. Chest radiography shows homogenous
opaque infiltrates and air bronchograms,
indicating contrast in airless lung tissue
seen against air-filled bronchi
5
(Figure 2);
decreased lung volumes also can be detected.
Meconium Aspiration Syndrome
Meconium-stained amniotic fluid occurs in
approximately 15 percent of deliveries, caus-
ing meconium aspiration syndrome in the
SORT: KEY RECOMMENDATIONS FOR PRACTICE
Clinical recommendation
Evidence
rating
References
Prenatal administration of corticosteroids between 24 and 34 weeks’
gestation reduces the risk of respiratory distress syndrome of the newborn
when the risk of preterm delivery is high.
A
20
Oronasopharyngeal suctioning before shoulder delivery does not prevent
meconium aspiration syndrome.
B
23
Use of selective serotonin reuptake inhibitors in late pregnancy may cause
persistent pulmonary hypertension of the newborn.
C
16
A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evi-
dence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series. For information
about the SORT evidence rating system, see page 922 or http://www.aafp.org/afpsort.xml.
Figure 1. Chest radiograph of an infant with
transient tachypnea of the newborn.
Reprinted with permission from eMedicine.com, 2007.
Available at: http://www.emedicine.com/radio/topic710.htm.
Newborn Respiratory Distress
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989
Newborn Respiratory Distress
infant in 10 to 15 percent of those cases,
typically in term and post-term infants.
10
Meconium is composed of desquamated
cells, secretions, lanugo, water, bile pig-
ments, pancreatic enzymes, and amniotic
fluid. Although sterile, meconium is locally
irritative, obstructive, and a medium for
bacterial culture. Meconium passage may
represent hypoxia or fetal distress in utero.
Similar symptoms can occur after aspiration
of blood or nonstained amniotic fluid.
Meconium aspiration syndrome causes
significant respiratory distress immedi-
ately after delivery. Hypoxia occurs because
aspiration takes place in utero. Chest radi-
ography shows patchy atelectasis or consoli-
dation
5
(Figure 3).
Infection
Bacterial infection is another possible cause
of neonatal respiratory distress. Common
pathogens include group B streptococci
(GBS), Staphylococcus aureus, Streptococcus
pneumoniae, and gram-negative enteric rods.
Pneumonia and sepsis have various manifes-
tations, including the typical signs of distress
as well as temperature instability. Unlike
transient tachypnea, respiratory distress syn-
drome, and meconium aspiration syndrome,
bacterial infection takes time to develop, with
respiratory consequences occurring hours to
days after birth.
Risk factors for pneumonia include pro-
longed rupture of membranes, prematu-
rity, and maternal fever. Prevention of GBS
infection through universal screening and
antepartum treatment reduces rates of
early-onset disease, including pneumonia
and sepsis, by 80 percent.
11
Current U.S.
protocol mandates screening for GBS in
all pregnant patients late in pregnancy and
treating those who have positive results with
intrapartum antibiotics at least four hours
before delivery.
12
Chest radiography helps in the diagnosis,
with bilateral infiltrates suggesting in utero
infection. Pleural effusions are present in
two thirds of cases.
13
Serial blood cultures
may be obtained to later identify an infect-
ing organism.
Less Common Causes
Pneumothorax, defined as air in the pleural
space, can be a cause of neonatal respiratory
distress when pressure within the pulmonary
space exceeds extrapleural pressure. It can
occur spontaneously or as a result of infec-
tion, meconium aspiration, lung deformity,
or ventilation barotrauma. The incidence of
spontaneous pneumothorax is 1 to 2 percent
Figure 2. Chest radiograph of an infant with
respiratory distress syndrome of the newborn.
Reprinted from Auckland District Health Board. Accessed
June 28, 2007, at: http://www.adhb.govt.nz/newborn/
TeachingResources/Radiology/LungParenchyma.htm#RDS.
Figure 3. Chest radiograph of an infant with
meconium aspiration syndrome.
Reprinted from © Auckland District Health Board. Accessed
June 28, 2007, at: http://www.adhb.govt.nz/newborn/
TeachingResources/Radiology/LungParenchyma.htm#RDS.
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Newborn Respiratory Distress
in term births,
14
but it increases to about
6 percent in premature births.
15
Persistent pulmonary hypertension of
the newborn occurs when pulmonary vas-
cular resistance fails to decrease soon after
birth as with normal transition. The eti-
ology may be idiopathic or secondary to
meconium aspiration syndrome, pneumo-
nia or sepsis, respiratory distress syndrome,
or transient tachypnea of the newborn.
Maternal use of selective serotonin reup-
take inhibitors in the third trimester also
has been implicated.
16
Certain congenital malformations can
lead to respiratory distress; these include
pulmonary hypoplasia, congenital emphy-
sema, esophageal atresia, and diaphragmatic
hernia. Upper airway obstructions from cho-
anal atresia or vascular rings may cause
similar results. Obstructive lesions include
choanal atresia, macroglossia, Pierre Robin
syndrome, lymphangioma, teratoma, medi-
astinal masses, cysts, subglottic
stenosis, and laryngotracheo-
malacia. Congenital heart dis-
ease also may be implicated.
Cyanotic heart disease includes
transposition of the great
arteries and tetralogy of Fal-
lot. Noncyanotic heart lesions
may cause a pulmonary over-
flow state leading to congestive heart failure.
These lesions include large septal defects,
patent ductus arteriosus, and coarctation of
the aorta. Malformations can sometimes be
found on antepartum imaging.
Neurologic disorders such as hydrocepha-
lus and intracranial hemorrhage can cause
respiratory distress. Central respiratory
depression can occur after maternal expo-
sure to medications, including labor analge-
sia and illicit drugs.
Metabolic and hematologic derangements
(e.g., hypoglycemia, hypocalcemia, polycy-
themia, anemia) can also cause respiratory
symptoms. Inborn errors of metabolism
should also be considered.
Finally, a small but significant number of
infants do not fit previously described pat-
terns. Delayed transition is diagnosed retro-
spectively when symptoms resolve within the
first few hours of life instead of progressing
as respiratory distress syndrome, transient
tachypnea of the newborn, or meconium
aspiration syndrome. The etiology is most
likely a combination of retained fluid and
incompletely expanded alveoli. Treatment is
supportive until the distress resolves in a few
hours as the transition completes.
Treatment
Treatment for neonatal respiratory distress
can be both generalized and disease-specific.
Physicians should be aware of current neo-
natal resuscitation protocols. Oxygenation
can be enhanced with blow-by oxygen, nasal
cannula, or mechanical ventilation in severe
cases. Surfactant administration may be
required. Antibiotics are often administered
if bacterial infection is suspected clinically
or because of leukocytosis, neutropenia,
or hypoxemia. Ampicillin and gentami-
cin are often used together based on their
effectiveness and synergy.
12
Extracorporeal
membrane oxygenation, similar to an arti-
ficial external lung, is used as a last resort
in critical circumstances. Oral feedings are
often withheld if the respiratory rate exceeds
80 breaths per minute.
If pneumothorax occurs, needle decom-
pression or chest tube drainage may be
required. Small pneumothoraces can be
treated in term infants without invasive
management through nitrogen washout.
Administration of 100% oxygen can accel-
erate the resolution of the pneumothorax as
readily absorbed oxygen replaces nitrogen in
the extrapulmonary space. This technique
can reduce pneumothorax duration from
two days to eight hours.
17
Because evidence in the specific treatment
of neonatal respiratory distress continues to
evolve, family physicians should work con-
jointly with neonatal intensivists. If services
required for the neonate are unavailable at
the family physician’s facility, care should be
transferred to a higher acuity hospital.
TRANSIENT TAChYPNEA OF ThE NEwbORN
Treatment for transient tachypnea of the
newborn is supportive because the condi-
tion is usually self-limited. Oral furosemide
Amnioinfusion for meco-
nium does not decrease
the incidence of meconium
aspiration syndrome or
perinatal death.
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991
Newborn Respiratory Distress
(Lasix) has not been shown to significantly
improve status and should not be given.
18
Data suggest that prenatal administration
of corticosteroids 48 hours before elective
cesarean delivery at 37 to 39 weeks’ gestation
reduces the incidence of transient tachy-
pnea of the newborn; however, this has not
become common practice.
19
RESPIRATORY DISTRESS SYNDROME
Treatment for respiratory distress syndrome
often requires some of the general inter-
ventions mentioned. In addition, prenatal
administration of corticosteroids between 24
and 34 weeks’ gestation reduces the risk of
respiratory distress syndrome when the risk
of preterm delivery is high, with an odds ratio
of 0.53.
20
Postnatal corticosteroid administra-
tion for respiratory distress syndrome may
decrease mortality risk, but it may increase
the risk of cerebral palsy.
21
Inhaled nitric
oxide may alleviate concomitant persistent
pulmonary hypertension of the newborn, but
its use in preterm infants is experimental.
22
MECONIuM ASPIRATION SYNDROME
General treatment practices are often used
for meconium aspiration syndrome. Stan-
dard prevention and treatment for meco-
nium aspiration syndrome previously
included suctioning the mouth and nares
upon head delivery before body delivery.
However, recent evidence suggests that aspi-
ration occurs in utero, not at delivery; there-
fore, infant delivery should not be impeded
for suctioning.
23
After full delivery, the infant
should be handed to a neonatal team for
evaluation and treatment. Although infants
previously have been given intubation and
airway suctioning, current evidence favors
expectant management unless certain crite-
ria (i.e., spontaneous respiration, heart rate
greater than 100 beats per minute, and rea-
sonable tone) are absent (Figure 4).
24
Meta-analyses have suggested that amnio-
infusion reduces aspiration for thick
meconium.
25,26
A recent well-designed,
randomized, multicenter trial with 1,998
women found that amnioinfusion for
meconium (even thick meconium) does
not decrease the incidence of meconium
aspiration syndrome or perinatal death.
27
There is insufficient evidence to recom-
mend steroid administration.
28
Evaluation
A detailed history is critical to proper evalua-
tion. The differential diagnosis changes with
gestational age: respiratory distress syndrome
typically affects preterm infants, whereas
meconium aspiration syndrome affects term
or post-term neonates. Antepartum infection
status is important, especially regarding GBS
infection status and prophylaxis. Information
about the duration of rupture, color of amni-
otic fluid, maternal temperature, maternal
tachycardia, and fetal heart tracing status is
vital to detect meconium aspiration and cho-
rioamnionitis. Family history assists in iden-
tifying inheritable congenital defects. The
onset and duration of respiratory symptoms
also provide clues. Transient tachypnea of
the newborn begins early and improves with
time. Conversely, sepsis and pneumonia may
have no early signs but may develop hours
to days later. Respiratory distress syndrome
Management of Deliveries
with Meconium-Stained
Amniotic Fluid
Expectant management
Intubation and suctioning
Presence of meconium-stained amniotic fluid
Use minimal stimulation and keep head
down to prevent breathing in meconium
Hand infant to neonatal evaluation team
Yes
No
Is infant vigorous by these criteria?
Heart rate > 100 beats per minute
Spontaneous respiration
Reasonable tone
Figure 4. Algorithm for the management of
deliveries with meconium-stained amniotic
fluid.
Information from reference 24.
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Newborn Respiratory Distress
begins early in premature infants without
signs of spontaneous improvement.
Physical examination also is helpful. In
the general assessment, physicians should
look for apnea, tachypnea, or cyanosis. Car-
diac auscultation detects murmurs sugges-
tive of congenital heart anomalies. Lung
auscultation may show asymmetrical chest
movement in pneumothorax or crackles in
pneumonia, or be completely clear in tran-
sient tachypnea or persistent pulmonary
hypertension of the newborn.
The severity of distress should be estimated
with an initial assessment. Mild distress may
warrant observation and pulse oximetry.
Severe distress, especially with a complicated
birth history, requires immediate resuscita-
tion, chest radiography, and laboratory tests.
Newborns commonly demonstrate signs of
respiratory compromise much earlier than
cardiovascular collapse. The variation of
neonatal distress makes application of a gen-
eral algorithm difficult, although a “rule of
two hours” for continuous reassessment has
Management of Neonatal Respiratory Distress
Figure 5. Suggested algorithm for the management of neonatal respiratory distress. (RDS = respi-
ratory distress syndrome; MAS = meconium aspiration syndrome; NICU = neonatal intensive care
unit; TTN = transient tachypnea of the newborn.)
Information from reference 29.
Infant presents with respiratory distress
Apply “rule of two hours”:
NICU consult/transfer (and consider laboratory tests or
antibiotics) if any of following is present:
(1) Abnormality on chest radiograph
(2) > 40% oxygen needed to oxygenate
(3) Condition deteriorates
(4) Condition does not improve within two hours
Endotracheal intubation
Ventilation
NICU consult/transfer
Consider antibiotics
Consider laboratory tests (Table 2)
Routine newborn care
Chest radiography
Pulse oximetry
Supplemental oxygen
Suggests TTN or delayed transition
Resolves spontaneously?
Clinical improvement?
Observe for 10 to 20 minutes
Yes
No
No
Yes
Resuscitation
Pulse oximetry
Supplemental oxygen
Chest radiography
Suggests RDS or MAS
Severe (severe grunting/flaring, apnea, cyanosis)
Mild (Mild tachypnea/grunting)
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993
been suggested (Figure 5).
29
During this time,
chest radiography and blood tests can be per-
formed (Table 2), and possible consultation
or patient transfer can be implemented. This
reassessment allows physicians to reevaluate
symptom severity as well as to update and
educate the parents.
The distinguishing features of tran-
sient tachypnea of the newborn, respira-
tory distress syndrome, and meconium
aspiration syndrome are summarized in
Table 3.
2-8,19,20,23,27
The Authors
Christian L. hermansen, mD, is associate director
of the Lancaster (Pa.) General hospital Family medicine
residency Program. he received his medical degree
from Jefferson medical College in Philadelphia, Pa., and
completed a residency in family medicine at Lancaster
General hospital.
Kevin n. Lorah, mD, is medical director of the neo-
natal intensive care unit and the newborn nursery at
the Lancaster (Pa.) General Women & Babies hospital.
he received his medical degree from Jefferson medical
College. Dr. Lorah completed a residency in pediatrics at
Geisinger medical Center in Danville, Pa., and a fellowship
Table 2. Laboratory Evaluation for Respiratory Distress in the Newborn
Test
Indication
Blood culture
May indicate bacteremia
Not helpful initially because results may take 48 hours
Blood gas
Used to assess degree of hypoxemia if arterial sampling, or acid/base status if capillary
sampling (capillary sample usually used unless high oxygen requirement)
Blood glucose
Hypoglycemia can cause or aggravate tachypnea
Chest radiography
Used to differentiate various types of respiratory distress
Complete blood
count with
differential
Leukocytosis or bandemia indicates stress or infection
Neutropenia correlates with bacterial infection
Low hemoglobin level shows anemia
High hemoglobin level occurs in polycythemia
Low platelet level occurs in sepsis
Lumbar puncture
If meningitis is suspected
Pulse oximetry
Used to detect hypoxia and need for oxygen supplementation
Table 3. Distinguishing Features of TTN, RDS, and MAS
Cause
Etiology
Timing of
delivery
Risk factors
Clinical
features
Chest radiography
findings
Treatment
Prevention
TTN
Persistent lung
fluid
Any
Cesarean
delivery
4
Macrosomia
Male sex
Maternal asthma
2
Maternal
diabetes
3
Tachypnea
Often no
hypoxia
or
cyanosis
Parenchymal
infiltrates
5
“Wet silhouette”
around the
heart
5
Intralobar fluid
accumulation
5
Supportive,
oxygen if
hypoxic
Prenatal corticosteroids
before cesarean
delivery if 37 to 39
weeks’ estimated
gestation (not accepted
U.S. practice)
19
RDS
Surfactant
deficiency
Lung under-
development
Preterm
Male sex
7
Maternal
diabetes
8
Preterm delivery
6
Tachypnea
Hypoxia
Cyanosis
Homogenous
infiltrates
5
Air bronchograms
5
Decreased lung
volumes
Resuscitation,
oxygen,
ventilation,
surfactant
Prenatal corticosteroids if
risk of preterm delivery
(24 to 34 weeks’
estimated gestation)
20
(accepted U.S. practice)
MAS
Lung irritation
and
obstruction
Term or
post-
term
Meconium-
stained
amniotic fluid
Post-term delivery
Tachypnea
Hypoxia
Patchy atelectasis
5
Consolidation
5
Resuscitation,
oxygen,
ventilation,
surfactant
Do not impede delivery
for suctioning
23
;
amnioinfusion of no
benefit
27
TTN = transient tachypnea of the newborn; RDS = respiratory distress syndrome; MAS = meconium aspiration syndrome.
Information from references 2 through 8, 19, 20, 23, and 27.
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Newborn Respiratory Distress
in neonatal and perinatal medicine at the state University
of new York health science Center in syracuse.
author disclosure: nothing to disclose.
Address correspondence to Christian L. Hermansen, MD,
Lancaster General Hospital Family Medicine Residency
Program, 555 N. Duke St., Lancaster, PA 17604 (e-mail:
clherman@lancastergeneral.org). Reprints are not avail-
able from the authors.
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