Premature / LBW / NICU Flashcards
What type of small babies can you get
SGA
- Could be genetic or due to IUGR
LBW
IUGR
What is IUGR
If still in womb
<10th centile
Suggest something happening in womb to compromise blood flow / sick baby
What causes LBW
Idiopathic Placental insufficiency Chromosomal Infection - TORCH / CMV / syphillis MCMA twins Malformation
What causes placental sufficiency
Maternal IHD High BP PET Abruption DM Systemic Sickle cell Smoking / alcohol
What are common problems in LBW
Perinatal hypoxia - increased haematocrit, bilirubin and plasma viscosity
= Polycytheaemia as hypoxia = produce more
Hypoglycaemia
Hypothermia
Thrombocytopenia - BM concentrating on making RBC
NEC
GI - as blood flow to more important organs in stress
Nutrition
Meconium aspiration syndrome as stressed
IRDS as less surfactant
Infection
What are long term problems of LBW
DM Hypertension Reduced Growth IHD Obesity Renal failure Stroke Retinopathy Lung - asthma
What is mild LBW and extreme
LBW <2.5kg
VLBW <1.5kg
Extreme <1kg
What is symmetric LBW
OFC and weight in the same percentile
What causes symmetric
1st trimester insult Affects all DNA Chromosomal Infection - TORCH Teratogenic drug Severe smoke / alcohol
Will symmetric LBW improve
Unlikely as will never have enough cells
What is asymmetric
OFC spares
Weight <10 centile
What causes asymmetric LBW
3rd trimester insult
Placental insufficiency - PIH
Will have catch up growth
Why is LBW associated with hypothermia
Lack of fat stores
Why is LBW associated with hypoglycaemia
No glycogen reserve as IUGR throughout pregnancy so constantly used up
What does the hypoxic state in utero of LBW babies cause
Increased haematocrit 20-22 (normal 18-20)
Increased plasma viscosity (VTE / slow circulation)
Polycythaemic to increase RBC as hypoxic
Increased bilirubin as have to break down
Thrombocytopenia as BM making RBC
How do you treat the hypoxic state of LBW babies
Partial exchange transfusion
Why does premature make you more prone to infection
IgG transfer in 3rd trimester
Immune system is underdeveloped
Interventions in premature
Can be caused by chorioamnitis
How do you treat infection
Prophylactic penicillin and gentamicin to cover strep and staph / gram -ve E.coli
Diff Ax if think meningitis
Do you worry more about pre-term but appropriate for gestational age or the pre-term SGA
Pre-term appropriate gestational age
SGA baby will have been under stress in the womb so produce natural steroids to mature lungs
Neonatal abstinence syndrome
OK
What has decreased infant mortality
Obstetric care Housing Nutrition Immunisation Ax NHS
What is most important in LBW babies
Nutrition
More prone to food intolerance and gut unable to absorb
What causes pre-term babies
Idiopathic Smoking / alcohol / drugs Over or underweight FH Malnutrition Infection - chorioamnitis PET DM APH Polyhydramnios Twins Malformation PPROM
What is term
37-42
Mild prematurity
32-37
Moderate
28-32
Extreme
<28 weeks
What Is important if premature
Nutrition Fluid - dextrose TPN if long term Syringe feed NG Vitamins ABIDEK Iron at 28 days Establish feet
Complications of pre-term
IRDS Bronchopulmonary dysplasia Minor resp issues IVH Periventricular leucomalacia Post haemorrhagic hydrocephalus Hypoxic ischaemic encephalopathy Neonatal jaundice NEC PDA Infection Low BP Hypothermia Hypoglycaemia Nutrition as poor feeding
What are long term complications of pre-term
Chronic lung - asthma / bronchiolitis Anaemia of prematurity Metabolic bone disease Retinopathy Cerebral palsy Low IQ / learning difficulties Hearing and visual
How do you screen for long term issues
Cranial USS
Retinopathy
What causes IRDS
Deficiency of alveolar surfactant Lungs can't expand Collapse Large pressure needed to inflate Leads to inadequate gas exchange, hypoxia and hypercapnia
What does this cause
Respiratory distress - Tachypnoea - Grunting - Nasal flaring - Cyanosis - Recession Exhaustion Resp failure - hypoxia/. hypercapnia
What are RF for IRDS and what is protective
Pre-term - Surfact produced >24 weeks Maternal DM - Hyperinsulin in baby inhibits cortisol C-section Male Perinatal asphyxia 2nd born twin
Protective - stresses baby = cortisol production
- PPROM
- IUGR
- Maternal HTN
- Antenatal steroid
How do you Dx
Blood gas CXR - Widespread bilateral change - Indistinct heart border - Air bronchogram - Ground glass opacity - May see tube if intubated
How do you prevent
Antenatal steroid
12 hours apart if any threat
Stresses lung to prevent
Delayed cord clamping
How do you Rx
O2 - nasal or mask or just flow to maintain pressure CPAP - open and inflate lung Support ventilation if blood gas worsens May need intubation Endotracheal surfactant once intubated
Complications of RDS / increased risk
Pneumothorax Infection Apnoea IVH Pulmonary haemorrhage NEC Renal failure
Long term
Chronic lung
Retinopathy due to hypoxia
Neuro, hearing and visual
When do you use CPAP
If only problem is keeping airway open
What is Ddx of IRDS
Sepsis = important TTN Meconium aspiration Congenital lung Persistent pulmonary hypertension Cardiac
What causes bronchopulmonary dysplasia
Lung overstretch e.g. ventilation
Causes oxygen toxicity
What does bronchopulmonary dysplasia cause
Persistent hypoxia Difficulty weaning of ventilation Infection due to tube Severe bronchiolitis Atelactisis - collapse Poor feeding
How do you treat
Steroids
Surfactant
High calories feed
What are complications
GORD Feeding issue Decreased IQ Cerebral palsy Asthma
What causes minor respiratory issues and what can underlying issue be
Baby forget to breath
Babies are mouth breather’s
Can be a pre-drome of illness
What minor issues is there
Apnoea >15s
Desaturation
Bradycardia
Irregular breathing
How do you treat
Attach apnoea monitors to premature baby
IV Caffeine - neuroprotective and stimulates resp
CPAP
What is most common limiting factor for poor prognosis in pre-term
Intra-ventricular haemorrhage
When does IVH occur
First 72 hours
How does it present
Seizure
Bulging fontanelle
Cerebral irritability
How do you Dx
Cranial USS as fontanelle hasn’t closed
MRI
Bloods
How do you Rx
Ante-natal steroid
Treat haemorrhagic shock
What do you do if hydrocephalus / raised ICP
Drainage
Shunt
What are complications
Post haemorrhagic hydrocephalus if clot occlude
Decreased IQ
Cerebral palsy
What is periventricular leucomalacia
White matter surrounding ventricles deprived O2 and blood
What types of intracranial haemorrhage I there
IVH = most common in pre-term
SAH
Subdural after forceps
What causes hypoxic ischaemic encephalopathy
SUSPECT IF ANY OF THESE EVENTS Brain injury 2 prolonged hypoxia / asphyxia / resp distress IVH PML Placental insufficeincy Cord prolapse Long delivery Abruption Maternal hypoxia / shock Infection Anaemia
What does mild HIE present with and how does it resolve
Hyperalert Hypertonia Poor feeding Irritable Acidosis on blood gas / poor Low APGAR Resolve within 24 hours and normal prognosis
How does more severe present and how does it resolve
Hypotonia
Seizure
Apnoea
Hyporeflexia / absent sucking rreflex etc
Resp depression
Coma
Takes weeks to resolve and usually lasting damage
How do you Dx
EEG
Flat single line
How do you Rx
Neonatal resus and ventilation Support circulation Support seizure Support nutrition Support acid base balance Therapeutic hypothermia for brain protection
What are the complications
Cerebral palsy Epilepsy Blind Deaf Learning difficulty
How does hypoglycaemia present
Hypothermia Hypotonia Lethargy Infection Apnoea Resp difficulty Poor feeding Vomiting High pitched cry Seizure Neuro complications
What are RF
Physiological in first few hours just encourage feed Pre-term IUGR SGA LGA / macrosomia Maternal DM Maternal BB use Sepsis Hypothermia Inborn error Beckwith Weidman
What should all irritable babies get
U+E
BG
Sepsis screen
How do you treat
Dextrogel Enteral feed - NG tube IV 10% glucose Regular electrolyte if on fluid Glucagon Hydrocrotisone Recheck glucose
When is hypo normal
Transient in 1st few days
Observe and encourage feed
What are RF for hypothermia
Premature
LBW
Prolonged resus
How do you investigate
Sepsis screen
TFT
Monitor blood glucose
How do you Rx
Dry Warm towel Radiant heater Heated oxygen Incubator
What are the complications
Increased energy demand + O2
Metabolic acidosis as poor perfusion
Pulmonary hypotension
What causes hypotonia
Sepsis Hypothyroid Jaundice Prader-Willi Down Benzo's HIE Cerebral palsy Neuromuscular Maternal myasthenia gravis Meconium aspiration Hypoglycaemia
What are neuromuscular causes
Spina bifida Myasthenia gravis Muscular dystrophy Guillian Barre Spinal muscular atrophy Cerebral palsy DMD - but doesn't present till later
What do you do if hypotonic
Sepsis screen
Underlying cause - BG / TFT / LFT
What do you follow up on
Development
What causes haemorrhage disease of newborn
Vit K defiicency
How does it present
Bruising
Jaundice
IVH / kidney
What causes retinopathy of premature / LBW
Abnormal development of retinal blood vessels
Can lead to scarring, retinal detachment and blindness
How is it screened of
30-31 weeks gestation if born <27 weeks
Or 4-5 weeks if >27 weeks
Screen every 2 weeks until can be seen that developing normal
How do you Rx
Laser photocoagulation to prevent neovascularisation
Intravitreal VEGF
Surgery if retinal detachment occurs