Case Series
Sudden Unexpected Postnatal Collapse: Analysis of Some Clinical Cases and their Diagnostic Approach
Stefano Parmigiani* and Laura de Hoffer
Department of Pediatrics and Neonatology, Eastern Liguria Hospital, La Spezia, Italy
*Corresponding author: Stefano Parmigiani, Department of Pediatrics and Neonatology, Eastern Liguria Hospital, Via V. Veneto, n° 197, 19124 - La Spezia, Italy
Published: 14 Mar, 2017
Cite this article as: Parmigiani S, de Hoffer L. Sudden
Unexpected Postnatal Collapse:
Analysis of Some Clinical Cases and
their Diagnostic Approach. Ann Clin
Case Rep. 2017; 2: 1301.
Abstract
SUPC is a clinical entity occurring in the first week of life that has been more defined recently. We here report six clinical cases defining their characteristics and discussing the diagnostic approach and preventive measures.
Keywords: SUPC; Skin-to-skin care; Hs troponin I
Introduction
Sudden Unexpected and Unexplained Postnatal Collapse (SUPC) is a relatively new clinical
entity. It wants to indicate a situation in which apparently healthy newborn infants present a sudden
and unexplained episode of hypotonia and/or pallor and/or apnea and /or bradycardia and/or
cyanosis that requires some form of resuscitation and can evolve into death. The event happens in
babies that have been given an Apgar score at 10 min >7, whose gestational age was >35 weeks and
typically occurs in the first week of life [1].
In practice SUPC includes two entities: early Sudden Infant Death Syndrome (SIDS) or Sudden
Un-Expected Neonatal Death (SUEND) and early Apparent Life Threatening Event (ALTE).
Incidence of SUPC is between 1.6-133 cases/100,000 live births depending on the reports. About
33% of SUPCs occur within the first 2 hrs after delivery, 33% between 2 hrs and 24 hrs, while the
remaining 33% between 24 hrs and the first week of life [1,2].
Risk factors that have been identified are [2-4]:
1. Unattended skin-to-skin care (SSC). SSC consists of giving the baby to his/her mother
immediately after birth and for the two hour subsequent to the delivery (post-partum period):
during such procedure the mother and the baby have not to be left unattended, and the presence of
persons like husband or grandmother that are not specifically educated does not give any guarantee.
2. SSC when mother is tired, sleepy or under sedation.
3. Use of mobile smartphone during SSC: many mothers send messages and photos after birth.
4. Newborn infants that have had any form of resuscitation, or are not stable or have medical
complications since birth.
5. Preterm infants < 36 weeks’ gestation.
6. Primiparous mother.
7. Unattended co-bedding.
8. Prone position of the infant.
9. Hypothermia (left axillary temperature <36.3°C [5,6]).
We here retrospectively describe 6 cases of SUPC that we have registered in 2015 in our general
county hospital, a secondary level perinatal center with level IIIA Neonatal Intensive Care Unit
(NICU) and Pediatric Emergency Room (ER), and analyze clinical, laboratory and instrumental
investigation data of such cases.
Case Series
Case 1
Female, 40+5wks’ gestation, birth weight (b.w.) 3,080 gr, Caucasian, born by vaginal delivery from a primiparous mother. Delivery was defined as precipitous.
Apgar score at 1 min was 9 and at 5 min were 10. At 46 hrs and 30 min
of age she presented brief episodes of perioral cyanosis accompanied
with tachypnea, and bradycardia till to 80 b/min during sleep. She was
brought by the mother to the Nursery. Capillary refill time was 3.5 sec,
the baby was given O2 and was admitted to the NICU. Exams did not
reveal infections, hypoglycemia, electrolytes disturbance, hemorrhage
or changes in echogenicity at brain ultrasounds; QTc interval on ECG
was within limits and chest X-ray was negative for diseases. The only
findings were a transient increase in Hs troponin I level and a small
Patent Foramen Ovale (PFO) with left-to-right shunt at Doppler
echocardiography. The baby was breastfed; first attachment was done
at 12 hrs. She was taken under observation and monitoring for seven
days and discharged when troponin was normalized and infection
excluded. Outcome after 1 year was favorable.
Case 2
Male, 39 wks’ gestation, b.w. 3,360 gr, Chinese, born by vaginal
delivery from a multiparous mother. Vaginal swab was positive
for Group B Streptococcus and complete intrapartum antibiotic
prophylaxis was given. Apgar score at 1 min was 8 and at 5 min
was 9. At first visit in the delivery room minimal axial hypotonia
was recorded. SUPC occurred at 3 hrs and 40 min of age with facial
cyanosis, axial hypotonia, acrocyanosis, tremors under stimulation,
valid suction, normal differential pulsoxymetry. He was given O2 for
few minutes and was admitted to NICU for observation and exams
particularly addressed to hypotonia and cyanosis. Aminoacidic
profiles and acylcarnitine were within limits. TSH was high (8.2 mU/L)
at the episode, but returned to normal after 1 month without any
therapy. Anti-thyroid antibodies were negative. Similarly ECG with
QTc interval measurement was normal as well as brain echography.
At Doppler echocardiography a small PFO was shown with left-toright
shunt. The baby was breastfed and first attachment was done at
4 min. Hospital staying lasted 8 days. He was lost at follow-up.
Case 3
Female, 40+2wks’gestation, b.w. 3,390 gr, Caucasian, born by
vaginal delivery at another hospital from a primiparous mother.
Apgar score was not available. SUPC occurred at home between 48-72
hrs, i.e. after an early discharge from the nursery. At 10 pm, 2 hrs after
breastfeeding, the baby was supine and presented tremors followed
by stiffening of head and trunk, and then hypotonia and pallor with
unconsciousness. Parents refer that the event lasted about 10 minutes.
At the arrival at ER she was awake, reactive, heart rate was 133 b/min
and transcutaneous SatO2 was 99% in room air. She was admitted to
NICU and given O2 because SatO2 subsequently lowered to 90%, with
respiratory rate of 35 br/min. Mild axial hypotonia was described and
bilateral ocular secretion too. Bacteriological examinations, including
blood, ocular secretions, urine, pharynx and auricular samples, were
negative as well CRP and the rapid test for Respiratory Syncytial
Virus (RSV). Glycemia, serum electrolytes and ammoniemia were
within limits. WBC and RBC count were normal but hematocrit was
62.8%. At 4 hours from the event QTc interval was elongated (450
msec) with reversed T in V1 and V4. After 18 hrs QTc interval was
normal (382 msec), but a complete right bundle branch block (RBBB)
was present. Hs troponin I level was increased (0.62 ng/ml). Doppler
echocardiography did not show anomalies. To exclude seizures, an
aEEG was performed and resulted within limits (then confirmed by
12 channels EEG). In the familial history there was a paternal aunt
with a not well defined genetic anomaly and peripheral paralysis.
The baby remained in hospital for 4 days and was discharged with
diagnosis of SUPC characterized by loss of consciousness and
hypotonia. Outcome after 1 year was favorable.
Case 4
Male, 40 wks’ gestation, b.w. 3,320 gr, Caucasian, born by elective
CS from a primiparous mother. Apgar score was 9 at 1 min and 10
at 5 min. SUPC occurred at home between 72-96 hrs of age. The
baby was discharged at 72 hrs. In the following day, while he was fed
with expressed mother’s milk given by bottle, he suddenly closed the
mouth, became hyperemic in the face and rapidly turned to hypotonia.
Mother stimulated him and he restarted breathing, however
remaining hyporeactive. He was therefore brought to pediatric ER
and at admission he was cold, sleepy with slow response to stimuli. The
physical examination was normal and vital parameters were stable.
Chest X-ray picture was compatible with inhalation of milk and, during
a subsequent feed, he presented 2 short episodes of desaturation with
spontaneous resolution. Hs troponin I, myoglobin and CK-MB levels
resulted altered. ECG showed non-specific anomalies of ST-T in V1
and V4. To exclude other diagnosis the following exams were done
and resulted negative: EEG, cardiorespirography, gastro-esophageal
junction and pyloric echography, adrenal glands echography, fundus
oculi, aminoacidemia, aminoaciduria, urinary organic acids, very
long chain fatty acids (VLCFA). Only troponin resulted high (1.32
ng/ml) and persisted high for days without significant ECG and
cardiac echo changes and with the baby being in good conditions.
For such a reason after 12 days he was sent to a Pediatric cardiology
center where, however, they could not explain the cause of such high
level of the enzyme and reckoned it was due to some problem of
the laboratory method. We discharged the baby with the diagnosis
of SUPC in gastroesophageal reflux done on a clinical basis. The
infant was subsequently admitted at another hospital at the age of 21/2
months confirming the clinical diagnosis of gastroesophageal reflux.
At 1 year the outcome was good.
Case 5
Female, 41+2wks’ gestation, b.w., 3270 gr, Caucasian, born by
vaginal delivery from a primiparous mother at another hospital.
Apgar score at 1 min was 9. Vaginal swab was positive for GBS
and antibiotic intrapartum prophylaxis completed. SUPC occurred
at home at 160 hrs of life. The mother referred that the previous
evening the baby had refused breastfeeding. Then, in the morning,
she sucked less vigorously than usual. Vomits and regurgitations at
every meal were reported. Parents therefore decided of paying a visit
to the hospital where the baby was delivered, but during the way the
baby became cyanotic, hypotonic and hyporeactive. They therefore
stopped at the first ER on their way, where the father attempted
mouth-to-mouth resuscitation and subsequently chest compressions
and insufflation were performed, following which the baby started
recovering. She was then transferred to our pediatric ER, and when
she arrived her vital parameters were within normal limits, she cryed
vigorously, her clinical exam, including the neurological aspect, was
normal. Capillary refill time was 2 sec. In the familial history: epilepsy.
Arterial blood gases, CBC, BUN, glycemia, serum electrolytes, CRP
resulted negative. Blood culture, auricular swabs, urine culture,
adeno-rota virus and Respiratory Syncytial Virus search resulted
negative. In the pharyngeal swab S. aureus was isolated. Normal was
also ECG, QTc, cardiorespirography, EEG, abdominal echography,
cerebral ultrasounds. Chest X-ray showed reduced transparency of
superior and medium right lobes, compatible with milk inhalation.
Gastroesophageal junction echography put in evidence an open His’
angle with frequent regurgitations and reduced cleaning time (>5
sec). At echocardiography PFO with right-to-left shunt was found,
and Hs troponin I was modestly increased: 0.239 ng/ml. The baby was
given amoxicillin + omeprazole and was discharged after seven days
with the diagnosis of SUPC and gastroesophageal reflux. She was lost
at follow-up.
Case 6
Female, 39 wks’ gestation, b.w. 3,290 gr, Caucasian, born by
vaginal delivery from a primiparous mother. Apgar score at 1 and
5 minutes was 9. SUPC was recorded at 8 hrs of life, in hospital. The
neonate was brought from the mother in her arms for regurgitation
and apnea. She was cyanotic, in apnea, hyporeactive and hypotonic.
Mucous with digested blood was present in mouth and choanae.
After aspiration of such secretions, O2 was administered with mask,
and gradual recovery of colour and reactivity followed. Hematocrit
resulted 71.1%, WBC 30,000/mm3, RBC 6,470,000/mm3, Hb 22.4
g/dl. All other exams were normal apart from the discovery of a
very small PFO with left-to-right shunt. The baby had already been
attached at mother’s breast within 1st hr and the mother had no
fissures of the nipple. The baby was given iv fluids due to the very
high hemoconcentration and after 5 days was discharged with the
diagnosis of SUPC by hematic hyperviscosity. Outcome after 1 year
was favorable.
Analysis by exams done (Table 1A and 1B)
When we analyzed the biochemical exams performed and their
contribution to the diagnostic process we could observe that blood
gas analysis (BGA) was altered in 50% of cases, Hs troponin I in 75%
of cases and TSH in the only case in which it was determined (100%),
while all other laboratory investigations resulted significant only to
exclude any particular disease. Instead, if we take into account the
instrumental investigations, the positivity of such exams was greater
and especially important when they were done on the basis of a
diagnostic suspect tied to symptoms.
Table 1
Table 2
Discussion
In the present report we analyze the data from 6 cases of SUPC
that we observed in our county general hospital in 1 year period.
Fifty percent occurred in hospital while the remaining 50%
happened at home. In particular 33% occurred in the time period
2-24 hrs, none in the first 2 hrs, and the remaining 67% in the time
interval 24-168 hrs.
From the literature data about one third of SUPC are registered
in the first 2 hrs of life and have been related to unattended or poor
controlled SSC, sleepy or tired mothers, unstable infants, use of smart
phone [2-4].
Why SUPC is limited to the first week of life, and especially to the
first hours after delivery, is not clear. One hypothesis is that transition
from fetal to extra-uterine life can make the newborn more vulnerable
during these first hours of life. Neuro modulators and prostaglandin
that inhibits fetal movement are elevated before delivery and during
birth, and fall after birth. In the normal delivery there is a fall in
the inhibiting adenosine and this allows more movements of the
newborn and increased breathing activity. Asphyxia during delivery
determines a great release of PGE2 in the newborn that has an
inhibitory effect on the brainstem centres of breathing. Besides these
levels of PGE in plasma are 20-fold higher in newborns than in older
infants, and declines quickly after the first postnatal week. Here hence
the hypothesis that PGE are implied in the respiratory instability of
the infant in the first week of life (see ref. 2 for mini review).
Prevention of SUPC is especially addressed to a greater attention
at risk factors in the first 2 hrs of life, when control can be more
easily conducted by skilled personnel in the delivery room [7]. In
Italy mother and infant must remain in the delivery room for the
first 2 hrs after delivery by law, where they are regularly checked by
skilled personnel. We can speculate that this is the major determinant
of the absence of cases in the first 2 hrs of life in our series. This in
turn might imply the need of a more close control in the first 24 hrs
while in hospital. However it remains very arduous to prevent home
events, even with prenatal and postnatal family education on correct
and controlled SSC, avoidance of unattended co-bedding, avoidance
of hypothermia and of supine position. Indeed in our cases none of
the preventable causes of SUPC [2,3] were evident. Only in case 2
mild hypotonia probably would have required more prudence before
starting rooming-in.
Besides our cases were each one very different in their
presentation, varying from respiratory symptoms to symptoms
related to feeding and to neurologic signs, and it is therefore difficult
to identify a classical clinical picture of SUPC and therefore also to
implement prevention, especially when babies are at home and a
direct control cannot be carried out. The major link between them is that 5 out of 6 were babies born by primiparous mother; however this
is a non-preventable risk factor. Case 1 had a collapse with troponin
movements; case 2 had hypotonia and transient hypothyroidism;
case 3 had tremors followed by stiffening and loss of consciousness
with RBBB, a transient elongation of QTc and troponin movement;
case 4 had hypotonia and hyporeactivity episode during feeding
and diagnosis was gastroesophageal reflux and persistent elevation
of troponin; case 5 similarly had gastroesophageal reflux and milk
inhalation, was resuscitated and also in this case troponin’s value was
altered; case 6 had hypotonia and hyporeactivity due to very high
hematocrit.
A second link was the presence in two cases of gastroesophageal
reflux, a treatable problem. Five cases out of 6 had hypotonia as
presenting symptom, but only one had hypotonia before the SUPC.
ECG changes found were in any case transient and can be interpreted
as secondary to the symptoms instead of being the cause of SUPC.
Signs and symptoms resemble ALTE and we cannot exclude that
links exist between ALTE and SUPC. Some Authors suggest a link
between SUPC and SIDS or ALTE in the first week of life is strong,
with analogous mechanisms and risk factors [8-10]. An apparent
connection is prevention by avoidance of the prone position of the
baby and by performing control during prone position of SSC.
As concern the laboratory investigations done to diagnose or
at least exclude any possible cause of SUPC, in our series the very
great majority of the exams performed routinely proved unuseful
to diagnosis, but useful anyway to exclude infections or electrolyte
disturbances or metabolic congenital problems. Hs troponin I
resulted positive in many cases, but this finding was not accompanied
with ECG abnormalities or, to be precise, was associated only with
minimal aspecific changes. We retain that the movement of troponin
can be related to the severity of the event more than to be a cause
of SUPC.Hs troponin I, being very sensitive, can be increased even
when damage to muscle of the heart is not evident on ECG, but can
be an indirect sign that something was really happened even when we
did not observe it. Severe infections and renal problems can alter Hs
troponin I, but its value is not influenced by difficult blood sampling
or muscle trauma [11]. Anyway more data are required to establish its
diagnostic value in infants.
As for the instrumental investigations, these were positively
involved in the diagnosis when they were done on a clinical suspect
basis. Indeed, also in this case it is difficult to say which investigations
could be avoided. Collapse and hypotonia and cyanosis, at this age
of life, can be due to infectious, cardiac, neurological or metabolic
problems as well. Clinical examination also when performed by
a skilled neonatologist, can give some clues and can induce to
perform some investigation before than others, trying non-invasive
exams if possible, e.g. ultrasounds instead of X-rays. However if the
results are negative it is necessary to search again and exclude other
possible causes. In the meanwhile the baby must remain under strict
observation and monitoring without interrupting the processes of
bonding and milking.
Minor echocardiographic findings as PFO, were not probably
connected with SUPC in our cases because in none of the patients
there were persistent neurological deficits possibly tied to cerebral
embolism through PFO. The increased value of troponin led to
perform echocardiography but it is very probable that changes of
cardiac enzymes and of ECG after a SUPC are a scar of the event and/or of the resuscitation manoeuvers and not the cause of it.
Looking at our data, different clinical onsets in different settings
(hospital vs home) were approached differently by the physicians. In
any case the work-up was consistent more with clinical symptoms
than with a standardized protocol for SUPC.
A protocol of investigations both for intra-hospital or outside
hospital SUPC has been proposed from Wellchild, a charity endorsed
by the British Association of Perinatal Medicine, to allow diagnosis of
SUPC, but it looks quite complex for an extensive use, especially to
screen with priority relevant and treatable problems [12].
Only in 50% of SUPCs of our series a possible and related cause
was found, and this is another similarity with ALTE. In the cases in
which we find a cause we can give a treatment or solve the problem.
When SUPC is idiopathic, instead, return at home creates problems
both for parents and physicians. Parents are worried about the
possibility that the event can recur and pediatricians do not have
precise answers. To propose home-monitoring in these cases might
be taken into account, but there are not definite indications for SUPC
cases.
Conclusion
SUPC is a relatively new acronym for an already known problem.
However the new approach to physiologic delivery and birth has
given an impulse to the frequency of such problem. Unattended
SSC and rooming-in seem the main cause of the increased incidence
of SUPC in hospital, together with erroneous indications to the
procedure. Cases happening at home may have other and less definite
facilitating causes.
A question arises: does the increase of SUPC recorded in the
last years determine a crisis of several concepts that have been
demonstrated to be useful for the infant and the mother-infant
bonding as SSC, rooming-in, discharge at 48 hrs? Our actual answer
is that a greater non-intrusive control during the first 24-48 hrs in
the hospital targeted to safe SSC, safe breastfeeding establishment
and secure positioning of the infant during sleep could reduce the
risk of intra hospital SUPC, and a checklist has been proposed for
evaluating SSC and the first 2 hrs after delivery that could be broaden
to the entire period of staying in the hospital [2,7]. Such physiological
approach requires skilled personnel in sufficient number, and not a
reduction of it, how rooming-in is too often interpreted by hospital
directorates. Anyhow such approach requires to be evaluated in large
numbers.
Prenatal and postnatal education of parents on SSC management,
co-bedding avoidance, back-to-spine sleep of the baby seems at
present the only way for preventing home SUPC as well SIDS.
More studies are necessary to define better SUPC, to determine a
simple protocol of first investigations and to promote new forms of
prevention.
References
- Herlenius E, Kuhn P. Sudden unexpected and unexplained early neonatal deaths in the North of England. Arch Dis Child Fetal and Neonat Ed. 2013. 96: F440.
- Herlenius E, Kuhn P. Sudden Unexpected Postnatal Collapse of the newborn infants: a review of cases, definitions, risks, and preventive measures. Transl Stroke Res. 2013; 4: 236-47.
- Feldman-Winter L, Greenspan JP. Committee on fetus and newborn, Task force on Sudden Infant Death Syndrome - Safe-sleep and Skin-to-Skin care in the neonatal period for healthy term newborns. Pediatrics. 2016; 138: e20161889.
- Pejovic NJ, Herlenius E. Unexpected collapse of healthy newborn infants: risk factors, supervision and hypothermia treatment. Acta Paediatr. 2013; 102: 680-688.
- Friederichs J, Staffileno BA, Foqq L, Jeqier B, Hunter R, Portugal D, et al. Axillary temperatures in full-term newborn infants:using evidence to guide safe and effective practice. Adv Neonatal Care. 2013; 13: 361-368.
- Takayama JL, Teng W, Uyemoto J, Newman TB, Pantell RH. Body temperature of newborn: what is normal?. Clin Pediatr. 2000; 39: 503-510.
- Ludington-Hoe SM, Morgan K. Infant assessment and reduction of Sudden Unexpected Postnatal collapse risk during skin-to-skin contact. NAINR. 2014; 14: 28-33.
- Weber MA, Ashworth MT, Risdon RA, Brooke I, Malone M, Sebire NJ. Sudden unexpected neonatal death in the first week of life: autopsy findings from a specialist centre. J Matern Fetal Neonatal Med. 2009; 22: 398-404.
- Poets A, Urschitz MS, Steinfeldt R, Poets CF. Risk factors for early sudden deaths and severe apparent life threatening events. Arch Dis Child Fetal Neonatal Ed. 2012; 97: F395-397.
- Fu LY, Moon RY. Apparent life-threatening events: an update. Pediatr Rev Am Acad Pediatr. 2012; 33: 361-368.
- Mahajan VS, Petr J. How to interpret elevated cardiac troponin levels. Circulation. 2011; 124: 2350-2354.
- Wellchild. Guidelines for the investigation of newborn infants who suffer a sudden and unexpected postnatal collapse in the first week of life: recommendations from a professional group on sudden unexpected postnatal collapse. London: Wellchild; 2011.