Lecture 1 - Assessment and Care of the Newborn Flashcards
Transition Period
First 4-6 hours of life
Normal physiologic changes in the newborn:
- decreased pulmonary vascular resistance
- increased blood flow to the lungs
- lung expansion with clearance of alveolar fluid
- closure of the ductus arteriosus
What is normal temperature of a newborn?
36.5 - 37.5 (97.7 - 99.5)
What are normal responses to cold stress?
Vasoconstriction
Increased muscle flexion
Metabolism of brown fat, glucose
During which trimester is glycogen storage increased?
3rd trimester
This helps them with body temperature regulation at birth
This is why full term babies do better with body temp regulation d/t having more glyogen
What factors impact blood glucose after birth?
Inadequate glycogen stores
Hyperinsulinemia (baby born to a DM mother)
Increased glucose utilization (stressed, sick infants)
What happens to an infant whose mother has DM?
during pregnancy the mother will have intermittent hyperglycemia causing her fetus to have hyperglycemia
the fetus responds by upregulating the pancreas which leads to hyperinsulinemia and thus hypoglycemia post birth
How to newborns with hypoglycemia present?
Lethargy Poor feeding Tachypnea Jitteriness Hypothermia
What are the recommendations for newborn glucose screening?
Asymptomatic infants at risk for hypoglycemia should be screened
- glucose level drawn within first 30 minutes to first hour of life (after 1st feed ideally)
- begin frequent feeding
- measure pre-feeding glucose every 3-6 hours for 24-48 hours
What is the heart rate for a newborn?
120 - 160 bpm
Sleeping: 85 to 90 bpm
Tachy or bradycardia may indicate underlying cardiac disease, anemia, sepsis
What is the normal RR of newborn?
40-60 breaths/min
Tachypnea may be sign of respiratory or cardiac disease
Apnea
- neurological impairment
- sepsis
- secondary to exposure to maternal medications (mag sulfate, anesthesia)
Acryocyanosis vs central cyanosis
Central cyanosis is NOT normal
Acrocyanosis is normal in first 48 hours —little blueness in hands/feet with pink limbs
No blue lips, blue trunk —-thats cyanosis and that’s bad
Apgar Score
LOOK AT CHART
Limitations to APGAR
Doesn’t predict neurological outcome
Doesn’t account for other variables such as maturity of the infant, congenital abnormalities, etc
All neonates are born with low levels of vitamin _____
K
They don’t have liver stores and this doesn’t cross the placenta well
What does vitamin K deficient bleeding (hemorrhagic disease of the newborn) at birth put the baby at risk for?
Bruising, mucosal bleeding
Bleeding in umbilicus, circumcision
Intracranial hemorrhage
What do we do for the vitamin K deficiency in newborns?
IM Vitamin K (0.5 to 1 mg) given within the first hours after birth
Erythromycin ophthalmic
28% of newborns delivered to women with gonorrheal infection develop gonococcal ophthalmia neonatorum
Given to EVERY BABY —placed over the eyes
Erythromycin 0.5% ointment
Early term
37 weeks to 38 6/7 weeks gestation
Late pre-term
32 weeks to 36 6/7 weeks
Very premature
28 weeks to 31 6/7 weeks
Extremely premature
28 weeks or less
Gestational age
Elapsed time between last menstrual period and delivery
Chronological (post-natal) age
Time since birth
Post-menstrual age
Gestational plus chronologic
basically time since conception
Corrected age
Chronological age minus number of weeks premature
12 month old born at 28 weeks gestation has a corrected age of 9 months
Low birth weight
BW < 2500 gm
Very low birth weight
VLBW
BW <1500gm
Extremely low birth weight
ELBQ
< 1000g
Small for gestational age
<10th percentile for GA
Large for gestational age
> 90th percentile for GA
How common are birth injuries?
Incidence: 1-2%
Possibly lower for cesarean section
What are risk factors for birth injuries?
Macrosomia (>4000gm)
Maternal obesity
Abnormal presentation (breech)
Operative vaginal delivery with forceps or vacuum
Small material stature, maternal pelvic anomalies
Precipitous delivery
Very fast delivery
Caput succedaneum
Edema above periosteum, after prolonged fetal head engagement or vacuum
soft swelling that extends across suture lines
benign, largest at birth, resolves within few days
complications:
- skin necrosis, infection, occasionally hemorrhagic
Cephalohematoma
Doesnt cross suture lines
Subperiosteum hemorrhage, much more common with forceps of vacuum
firm then fluctuant, not discolored, distinct margins, does not cross suture lines
Can increased for 12 - 24 hours, resolves over 2-3 weeks
complications:
- fracture
- infection
- hyperbilirubinemia
Subgaleal hemorrhage
Below aponeurosis, above periosteum, shearing of veins,
More common after vacuum
diffuse, fluctuant, fluid waves, unconfined, can extend from orbital ridges to upper neck
can increase steadily after birth, resolves over 2-3 weeks
complications:
- blood loss
- coagulopathy
- shock
- 12-14% mortality
tx: blood products, volume
What can cause caput succedaneum?
Prolonged fetal engagement or vacuum
Can cross suture lines since it affects the scalp
Often unilateral
Benign -resolves within days
What is the treatment for caput succedaneum?
Benign condition
Resolves within days
What causes cephalohematoma?
forceps of vacuum
Collection of blood under the periosteum
Does NOT cross suture lines
If more than one bone affected, will have separation between the two areas at suture line
Evolves over 24 hours or more d/t slow bleed
Will resolve within 2-4 weeks
Subgaleal Bleed
Most concerning head injury of infants
Triad:
Tachycardia
Decrease in HCT
Increase in head size
Support their fluids, check coagulation factors
Shoulder Dystocia
Birth injury
After delivery of the head, the anterior shoulder cannot pass below, or requires significant manipulation to pass below the pubic symphysis
Complications:
- brachial plexus injury
- clavicular fx
- humerus fx
- hypoxic-ischemic encephalopathy
- death (5-15%)
Complications of shoulder dystocia
Complications:
- brachial plexus injury
- clavicular fx
- humerus fx
- hypoxic-ischemic encephalopathy
- death (5-15%)
Brachial Plexus injury
Birth injury secondary to should dystocia
Almost always from stretching/traction of the nerves
Most cases unilateral
Management: PT after several days, continued weekly for 3 months
Prognosis: recovery over 1-3 months
Persistent impairment in 20-50%
What is the minimum criteria for discharge of well term newborn?
Stable VS at least 12 hours, including temp
Regular urine output, at least one spontaneous stool
At least 2 successful feedings
No excessive circumcision bleeding for >2 hours
Appropriate screening for hyperbilirubienmia
Appropriate evaluation and monitoring for sepsis risk
Hepatitis B vaccine, review of maternal vaccinations
Newborn screening (Blood spot, hearing, CCHD)
Appropriate care seat available
Follow up care identified
Maternal and family education provided
Risk factors for safe home environment assessed
Meconium
Stool
Dark color, sticky consistency, odorless
Normal passage of meconium - at least 1 stool in first 48 hours of life
Onset of transitional stools by day of life 4
Delayed passage of meconium
Prompt consideration of
- hirschuprung disease
- imperforate anus or other obstruction
- meconium ileus = cystic fibrosis until proven otherwise f
What must be done if there is a delay in conversion to transitional stools?
Evaluation of feed adequacy
When does the first urination occur?
Should occur within the first 24 hours
Can be difficult to detect in presence of frequent meconium
What is the first thing you do for a pt that isn’t urinating?
Take a detailed pregnancy history
Decreased amniotic fluid (oligohydramnios)
Pre-natal US findings suggestive of renal/urinary disorders
Then
Assess feeding adequacy
PE - GU, abdomen, spine
Catheterization, hydration, bladder and renal US
What are other normal diaper findings?
Urate crystals - orange - sit on the surface of the diaper
Vaginal discharge —might occur on the 3rd day of life and resolves in a few days —-unless there is A LOT of blood this is normal —-check Vitamin K if large blood loss
Weight loss in infants
Normal as long as the pt is feeding well
Weight loss >10-12% in the first post natal week is cause for concern and should be evaluated
Emphasis should be on establishing a feeding relationship between infant and mother and promotion of breastfeeding
Rule of thumb: most infants will be back to birth weight by 2 weeks of age