Neonatology Flashcards
Define stillborn
Foetus w/ no signs of life > 24 weeks
Define neonate
Infant < 28 days after term date
Define preterm
Gestation <37w
Define post term
> 42 weeks
Incidence VSD
30%
Incidence persistent arterial duct
12%
Incidence ASD
7%
L-R shunts overall Sx
Breathless
R-L shunts overall Sx
Blue
Common mixing overall Sx
Breathless + blue
Outflow obstruction in well child overarll Sx
Asymp + murmur
E.g.s of outflow obstruction in well child (2)
Pulmonary stenosis
Aortic stenosis
Outflow obstruction in sick neonate overall Sx
Collapsed w/ shock
E.g of outflow obstruction in sick neonate
Coarctation of aorta
R-L Shunts e.g.s (2)
ToF
Transposition of great aa
Common mixing e.g.
Atrioventricular septal defect
Which are the cyanotic lesions (3)
ToF
ToGV
AVSD
Which are the acyanotic lesions (5)
VSD ASD PDA PS AS
Common heart lesions associated w/ Downs (2)
AVSD
VSD
Common heart lesions associated w/ Turners (2)
Aortic valve stenosis
Coarctation of aorta
What does a transplacental infection transmission lead to (5)
Still birth/miscarriage IUGR Microcephaly Hydrocephalus HSmegaly
When is risk of transplacental infection highest?
In 1st 16w pregnancy
When does early onset sepsis occur?
<48hrs after birth
Why does early onset sepsis occur?
Bacteria from birth canal –> amniotic fluid
What 2 organisms tend to be causative in early onset sepsis?
E.coli
GBS
What is a common illness associated with early onset sepsis?
Pneumonia
What septic screen should be undertaken if you suspect early onset sepsis?
Urinalysis
FBC
CXR
LP
Mx early onset sepsis
ABx IV amoxicillin/ gentamicin
When does late onset sepsis occur?
> 48hrs after birth
Most common cause late onset sepsis
Staph epidermis
Mx late onset sepsis
Fluclox/gentamicin
Mortality neonatal meningitis
20-50%
Signs neonatal meningitis
Sepsis
Bulging fontanelle
Hyperextension of neck + back
Mx neonatal meningitis
Amoxicillin + cefotaxime
Signs early infection from Group B streptococcus
Pneumonia + resp distress –>meningitis + sepsis
What does the severity of early GBS depend on
Duration of infection in utero
Mortality rate early GBS
10%
When does late GBS occur
@ 3 months
What occurs in late GBS
Meningitis or osteomyelitis/septic arthritis
RF GBS (5)
Pre-term PROM Maternal fever during labour Chorioamnionitis Previously infected infant
Antenatal Mx group B strep
Prophylactic intrapartum ABx
IV Ben Pen
Postnatal Mx group B strep
CXR + septic screen, FBC, CRP
Broad spectrum ABx
RF maternal Hep B (3)
IVDU
HIV
Multiple sexual partners
If the baby is +vefor HBsAg, what must be done?
Hep B vaccine after birth
Which babies are at highes risk of developing chronic Hep B?
If mothers have antigens for Hbe but no antibodies
If a baby is at risk of developing chronic Hep B, what is the Mx?
Give Hep B IGs within 24hrs
What % neonates with CMV will be normal?
90%
What % neonates w/ CMV will have HSmegaly and petechiae –> nero problems?
5%
What will the remaining 5% of neonates w/ CMV develop in later life?
SNHL
Sx CMV in mother
Asymptomatic
Sx rubella in mother
Low grade fever Conjunctivitis Coryza Rash Arthralgia
If mother gets rubella @ 8-10w gestation, what are the effects on the foetus?
90% chance of: ANHL Congenital cataracts PDA HSmegaly CP Small eyes
What is the risk of damage to foetus if rubella is contracted at 11-16w
10-20%
Where do you contract toxoplasmosis from?
Cat poo
Raw meat
If contracted in utero, what can toxoplasmosis cause?
IU death
CNS damage - hydrocephalus, calcification
Sx newborn w/ toxoplasmosis infection
LBW HSmegaly Jaundice Inflamed retina Petechiae LT neurodevelopmental issues
If untreated, what % transmission rate is it for HIV from mother –> foetus
25%
If untreated, what % transmission rate for HIV from mother –> foetus
<2%
Methods of preventing perinatal transmission (4)
ART antenatally, perinatally + postnatally (want undetectable viral load @ time delivery)
Pre-labour C section if VL detectable
Avoid breast feeding
Active Mx labour - avoid PROM
Sx syphilis in neonate (9)
FTT Irritability Flat nose Rash - mouth/anus/genitals Water rhinitis HSmegaly Bone deformity Anaemia Meningitis
Sx neonatal chlamydia
Conjunctivitis
Peri-orbital swelling
What is gonorrhoea associated with in pregnancy
Choriomanionitis
Incr risk prematurity
Sx ophthalmia neonatorum
Purulent discharge, lid swelling, corneal haze
How is herpes transmitted to baby?
Infected birth canal
How to prevent herpes?
C-section
How can having herpes as a neonate –> death?
Encephalitis
Or disseminated disease
Causes of bilious vomiting (5)
Intussusception Obstruction/volvulus Malrotation Tumour Hirschprungs
Define IUGR
Asymmetrically growth restricted
Less than geneitcally predetermined size
Weight and abdo circumference lie on lower centile than that of head
Define small for gestation age
Smaller in size than normal for sex + gestational age
Maternal causes IUGR (8)
Incr maternal age HTN DM Alcohol/Dx use Smoking Renal disease Untreated coeliac Warfarin, steroids, phenytoin
Placental causes IUGR (3)
Small
Cell death
Pre-eclampsia
Foetal causes IUGR (4)
Multiple pregnancy
Chromsomal abnormalities
Congenital defects
Infection - CMV, toxoplasmosis, rubella, syphillis
After birth, what is there an increased risk of if the baby was IUGR?
CV
T2DM
AI
Signs a newborn infant is in respiratory distress (5)
Tachypnoea >66RR Sternal + subcostal recession Nasal flaring Expiratory grunting Cyanosis if severe
What causes transient tachypnoea of the newborn?
Delay in resorption of lung fluid
Xray appearance transient tachypnoea
Fluid in horizontal fissure
How long does transient tachypnoea of the newborn take to settle?
Usually within 1 day of life
What is respiratory distress syndrome?
Deficiency of surfactant –> decr surface tension –> widespread alveolar collapse + poor (g) exchange
What is surfactant secreted by?
II pneumocytes of alveolar epithelium
WHo is at risk of respiratory distress syndrome?
Pre-term <28weeks
What should you give babies in risk of having respiratory distress syndrome?
Glucocorticoids to incr surfactant
PS respiratory distress syndrome (5)
Tachypnoea Chest wall recession - sternal/subcostal Nasal flaring Grunting Cyanosis
Ix for respiratory distress syndrome
CHXr
Appearance of CXR in respiratory distress syndrome
Diffuse granular appearance - ground glass
Indistinct heart border
Mx respiratory distress syndrome (3)
Surfactant therapy via tracheal tube
O2 + CPAP
Artificial ventilation
Factors predisposing to congenital pneumonia (3)
PROM
Chorioamnionitis
LBW
Mx congenital pneumonia
Broad spectrum ABx
What side is a diaphragmatic hernia usually on?
Left
How to detect diaphragmatic hernias
USS
PS diaphragmatic hernia
Failure t respond to resus/ resp distress
O/E diagragmatic hernia
Displaces apex beat + heart sounds to right
Poor entry air into L chest
Bowel sounds in chest?
How to diagnose diaphragmatic hernias
CXR
Mx diaphragmatic hernia
NG tube
Surgical repair
% survival rate diaphragmatic hernia
50%
CXR meconium aspiration
Irritant to lungs –> obstruction –> chemical pneumonitis
Signs meconium aspiration
Cord/fingernails green
Resp distress signs
Mx meconium asp if baby cries @ birth
Normal resp
So no resus
Mx meconium asp if baby has reduced breathing
CRAP
Mx meconium asp if baby not breathing
Suction meconium w/ large bore suction catheter
Causes of prematurity (5)
Pregnancy induced HTN Infection PPROM Previous pre-term baby Anatomical abnormality of cervix or uterus
Problems faced by baby born <26w
Resus @ borth RDS Pneumothorax APnoea Bronchopulmonary dysplasia HoTN PDA Hypothermia Metabolic imbalances Jaundice Infection NEC ROP PVLM/IVH Anemia Hernia
What is necrotising enterocolitis
Bacterial invasion of ischaemic bowel
Sx NEC
Distended abdo and stool bleed
Mortality NEC
20%
For who is hypoglycaemia likely for in their 1st 24hrs? (6)
IUGR Pre-term Mother w/diabetes Large for date Hypothermic Ill
Sx hypoglycaemia (5)
Irritability Apnoea Lethargy Drowsiness Seizures
What level of glucose is required for neurodevelopment
> 2.6
Tx hypoglycaemia
Early + freq feed w/ breast link
If really low - IV infusion glucose
Maybe glucagon + hydrocortisone
What can hypothermia cause? (5)
Incr E consumption Hypoxia Hypoglycaemia Failure to gain weight Incr mortality
Which babies are particularly suscpetible to hypothermia (3)
Incr SA:Vol
Thin skin
Decr fat
Tx hypothermia
Incubate
Humidify air
When are episodes of apnoea common in LBW infants?
Under 32 weeks
When does bradycardia occur with apnoea?
If infant doesn’t breath for 20-30s
Breathing against closed glottis
Mx apnoea
Physical stimulation
Caffeine
CPAP
What does retinopathy of prematurity affect?
BV at jct of vascular + non-vascular retina
What does vascular proliferation in retinopathy lead to?
Retinal detachment
Fibrosis
Blindness
Tx of retinopathy of prematurity?
Laser therapy
Ophthal review every week
Who is intraventricular haemorrhage common in?
Underweight children/neonates
PS intraventricular haemorrhage
Apnoea Lethargy Poor mm control/tone Hydrocephalus Incr ICP + bulging fontanelle
What can an intraventricular haemorrhage progress into?
Coma
Mx intraventricular haemorrhage
Supportive
Correct acidosis, anaemia + hypotension
Fl - decr ICP
Ventriculoperitoneal shunt
If a baby is born at 28w, how long does it taken them to double their weight?
6 weeks
If a baby is born at term, how long does it take them to double their weight?
4/5months
At how many weeks is a baby mature enough to swallow milk?
35-6
NG feeding for less mature babies
Cont phosphate protein + Kcal
+ Ca + Vit D
+ Fe
Enterally
Advantages of breast milk in premature babies (5)
Ideal nutrition for first 4-6m Life saving in LICs Decr risk GI infection (NEC) Incr mother-child relationship Decr risk diabetes, HTN, obesity
What is bronchopulmonary dysplasia?
O2 requirement at post menstrual age @36W
Characteristic CHX bronchopulmonary dysplasia?
Widespread opacification
Mx bronchopulmonary dysplasia
Wean onto CPAP
Neurodevelomental complications of prematurity
Cerebral palsy
Complications of blindness + deafness
CV changes after first breath
Decr pulmonary resistance x6 incr blood to lungs Decr blood to RA (b/c no placenta) LA > RA - FO closes DA closes
How is lung fluid reabsorbed @ birth?
Chest compression during birth squeezes out 1/3
Release of adrenaline incr reabsorption
Within how long should a baby pass urine?
24hrs
Within how long should a baby pass meconium?
<48hrs
How long should it take for a neonate to regain its birth weight?
7-10days
Normal BW
3.5kg
Low BW
2.5kg
V low BW
1.5kg
Extremely low BW
1kg
Within how long of delivery should a mother attempt to breastfeed?
1hr
What prophylaxis must all newborns have?
Vitamin K
How is vitamin K administered
Single IM
or 3x PO dose
Why is Vit K given prophylactically?
Prevent haemorrhagic disease of newborn
When does haemorrhagic disease of the newborn occur?
In 1st week of life
or up to 8 weeks
If mild, what are the Sx of haemorrhagic disease of the newborn?
Bruising
Haematemesis
Melena
Prolonged bleeding from umbilical stump
If severe, what are the Sx of haemorrhagic disease of the newborn?
Intracranial haemorrhage –> brain damage/death
Why is Vit K low in the newborn? (4)
Poor placental transfer
Absence of Vit K prod bacteria in neonatal gut
Liver immaturity
Breast milk has low levels of vit K
Vit K regime if mother takes anticonvulsants
PO prophylaxis from 36w + IM injection
When should the new born exam happen?
Within 72hrs
When is peripheral cyanosis common?
1st day
Why might a baby have swollen eyes and distortion of head shape
From delivery
What are epstein pearls
White pears on palate
When is erythema toxicum common?
2-3 days
What is erythema toxicum
White pinpoint papules in erythematous base
On trunk
What is Milia?
Baby acne
What is caput secundum
Oedematous swelling on scalp b/c pressure against cervix
Cephaematoma
Subperiosteal collection of blood
After rupture of vessels betw skull + periosteum
When does port-wine stain occur
From birth
When does strawberry naevus occur?
1st month
What is Guthrie?
Heel prick test taken @ 5-9 days
What does the Guthrie test screen for? (4)
PKU
Hypothyroid
Haemoglobinopathies - sickle cell, B thalassaemia
MCAD
What 3 things are noted if CF?
Serum trypsin
Incr in pancreatic duct obstruction
When does a hearing test occur/
Within 2 weeks of birth
What is EOAE testing
Earphone over ear
Sound evokes ech from cochlear if fct normal
Appearance of a capillary haemangioma
Pink macule on upper eye lid, mid forehard or neck distension of dermal capillaris
Reasons for feeding difficulties in the newborn (4)
Cleft lip/palate
Premature - unable to suck/swallow
Poor attachment to nipple
GORD
What is a brachial plexus injury ?
Traction of branchial nn root
Who is at increased risk of a brachial plexus injury?
Breech
Shoulder dystocia
Features of Erbs palsy
Arm lies flat, limp
Hand pronated
Fingers flexed
Outcome brachial plexus injury
Most resolve completely
If not by 2-3months - Rx
What is Sticky eye
Yellow discharge from corner of eye –> crusting
Why does sticky eye occur?
Blockage of small tear ducts
Mx Sticky Eye
Bathe - sterile H2O
Why does Haemolytic disease of newborn occur?
Transplacental transfer maternal antibodies –> immune haemolysis of RBC in newborn
Causes haemolytic disease of newborn (3)
Rhesus
ABO
Other antibodies - Kell, Duffy
Antenatal presentation of Rhesus
Coombes test - presence antiD antibodies mother
USS - hydrops fetalis/polyhydramnios
Neonatal presentation Rhesus
Jaundice
Oedema
HS megaly
Ix Rhesus (4)
Coombs
USS
FBS
Post natal - umbilical blood sampling
Mx Rhesus
O transfusion via umbilical vv if anaemia
What % babies w/ Rhesus = norm @ birth
50% (still monitor for late anaemia)
What % Rhesus babies req transfusion
25%
How to Tx jaundice assoc w/ Rhesus
Phototherapy
Mother + father blood groups for ABO incompatibility
Type A/B father
Type O mother
PS ABO incompatibility
Jaundice but not as sever RH
When does ABO incompatibility peak?
12-72hrs
Mx ABO incompatibility
Severe - transfusion
Neonatal blood test
Phototherapy
Prognosis ABO incompatibility
SNHL
Main RF for congenital abnormalities (5)
Maternal/paternal age Consanguinity Infections - TORCH Toxins - alcohol, smoking, mercury, Dx Dietary deficiency - folic acid, too much vit A
CHARGE
Coloboma of eye Heart Defect Atresia of nasal choaenae Retardation of growth Genitourinary Ear and deafness
VACTERL
Vertebral defects/scoliosis Anal Atresia CV abnormalities TO fistula Eosophageal atresia Renal abnormalities Limb defects
What is VACTERAL associated with
Diabetic mothers
Edwards (trisomy 18)
What is Trisomy 13?
Patau
Risk factors Patau
Female
Incr maternal age
PS Patau
LBW Congenital heart defects - Holoprosencephaly NTD Severe LD Small eyes Scalp structures Gastro/UG defect Plydactylyl
Congenital heart defects associated with Patau’s (4)
ASD, VSD, PDA, dextrocardia
Holoprosencephaly
Defect in brain hence doesn’t split into 2 halves
Median survival neonate with Pataus
2.5 days
What is Trisomy 18
Edwards
What % foetuses with Edwards will die?
95%
Prenatal features Edwards (7)
Polyhydramnios Oligohydramnios Small placenta Single umbilical aa Fetal distress IUGR Weak fetal activity
Postnatal features Edwards (8)
LBW Craniofacial abnormality Skeletal abnormalities - overlapping fingers, prominents calcaneus Heart defects GI abnormalities Urogenital - hydronephrosis Neuro - hydrocephaly, LD Pulmonary hypoplasia
Mean life expectancy Edwards
4 days
Anencephaly
Failure to develop most of cranium/brain
Prognosis Anencephaly
Still born/die @birth
Encephalocele
Midline skull defects –> extrusion of brain/meninges
Mx encephalocele
Surgical correction
Spina bifida occulta
Failure of fusion of vertebral arch
Appearance spina bifida in lumbar region
Tuft of hair, lipoma, birthmark or dermal sinus
Meningocele
Skin + meninges form out-pouching
Cord remains in meninges
PS similar to spina bifida
Myelomeningocele
Communication between surface + meninges
Complications myelomeningocele
Paralysis Sensory loss Mm imbalance Neuropathic bladder Scoliosis Hydrocephalus
Male - ambiguous genitalia
Hypospasias + bifid scrotum
Undescended/palpable testes
Female - ambiguous genitalia
Clitoral hypertrophy
Vulva + single opening
Ovotesticular disorder of sex development
Both XX + Y cells present in foetus hence both testes + ovarian tissue
What is Potters sydrome
Pressure in utero –> oligohydramnios –> urgenital abnormalities
When do foetal kidneys develop?
Betw 5-7w
When does foetus urine production start?
From 14 weeks
Potters syndrome PS (7)
Dysmorphic face - flat nose, recessed chin, low-set cartilage Pulmonary hypoplasia Anuria/oliguria Cataracts/lens prolapse CV malformations MSK - clubbed feet, malformed hands Brain abnormalities
What is HIE due to?
Significant hypoxic events immediately before/after delivery
E.g. placenta problem, chord compression, shoulder dystocia, maternal HoTN, IUGR, anaemia, failure cardio-resp adaptations @ birth
Mild HIE (4)
Irritable
Respond to excessive stimulation
Hyperventilation
Impaired feeding
Moderate HIE (3)
Tone abnormalities
Can’t feed
Seizures
Severe HIE (4)
No norm/spontaneous movements
Hypertonia/hypotonia fluctuation
Prolonged seizures
Multi-organ failure
Mx HIE (7)
Resp support EEG Seizure Tx Fl restriction Tx HoTN Monitor hypoglycaemia, electrolyte imbalance Cool child to 33/34' within 6hrs
Prognosis mild HIE
Excellent
Prognosis mod HIE
If full recovery by 2 weeks = excellent
Prognosis severe HIE
Mort 30-40%
80% have neurodevelopmental issues
What is acrocyanosis and is it normal
Peripheral cyanosis around extremities
is completely normal
due to benign vasomotor changes –> peripheral vasoconstriction