CVPR Week 9: Pediatric pulmonology Flashcards
Objectives

General approach to a clinical problem

The approaches to respiratory distress in the neonate

Neonate is having respiratory distress now what?
Neonate is having respiratory distress historical components

Neonate is having respiratory distress: Physical exam
- Color
- Work of breathing (rate, retractions)
- Pulse oximeter
- Shape of chest and belly
- Obvious malformations
- Pulses/perfusion/BP
Neonate is having respiratory distress: Tests
- CXR & other imagery
- blood work
- consultant evaluations
Case 1
Describe


What causes these?


What is this?


Key history for tracheoesophageal polyhydramnios
Maternal polyhydramnios
Clinical presentation of tracheoesophageal fistula
- choking
- gurgling
- noisy respiratory distress
Prevalence of tracheoesophageal fistula
relatively common 1:3,000 births
Common comorbidities of tracheoesophageal fistula
- Multiple anomalies 80%
- Congenital heart disease - 20%
- Imperforate anus -10%
VACTERL association
Vertebral-rib, anus, cardiac, TEF, renal, limb anomaly
TEF AKA
tracheoesophageal fistula
Types of TEF

Reevaluate clinical vignette


Prenatal evaluation of the respiratory system

What is Polyhydramnios?
Too much amniotic fluid
Polyhydramnios features

What is oligohydramnios?
Too little amniotic fluid
Oligohydramnios features

PE of neonate with respiratory problems

What is this?


Surfactant is produced by?
Type II pneumocytes
What is surfactant and what does it do?
- It is a complex molecule that is part protein part phospholipid and it
- lowers surface tension when surface area is small
- increases Surface Tension when a surface area is large
What does surfactant directly oppose?
Laplace’s law

What would happen without surfactant?
- small alveoli would deflate
- large alveoli would inflate
The physiological consequence of not having surfactant
a pattern of atelectasis and hyperinflatiion would emerge
and upon ventilation air would preferentially go to already large alveoli and avoid deflated alveoli

Premature birth and respiratory distress syndrome

Surfactant deficiency does what to lung compliance?

Risk factors for surfactant deficiency
- Prematurity 28 GA
- Gestational diabetes
- Male/White/Twins
- Previously affected sibling
Clinical features of surfactant deficiency

RDS AKA
Respiratory distress syndrome
Antenatal Tx of RDS
Delay birth - Tocolysis, bedrest
Administer antenatal corticosteroids (betamethasone, dexamethasone)
Post-natal Tx of RDS

What is surfactant replacement therapy?
synthetic product from bovine and ovine

Conditions that may mimic RDS in life

TTN AKA
Transient tachypnea of the newborn
Transient tachypnea of the newborn features
- term or near term
- C-section
- CXR shows increased fluid but NOT ground glass opacities
- gets better after 2-3 days

Transient tachypnea of the newborn excess interstitial lung fluid causes?
reduced lung compliance
Transient tachypnea of the newborn presentation
- Cesarean section delivery / short labor
- Late preterm delivery
- Tachypnea/grunting/retractions/nasal flaring
CXR of Transient tachypnea of the newborn
normal lung volume, increased interstitial lung markings
Transient tachypnea of the newborn duration
usually self-limited to 24-48 hours
What is a diaphragmatic hernia

Diaphragmatic hernia pre-natal pulmonary complications
- inadequate fetal respiratory movements
- poor lung inflation in utero (with amniotic fluid)
- lung underdevelopment
- pulmonary hyperplasia
- pulmonary vascular underdevelopment
- set up for pulmonary HTN post-natally
Diaphragmatic hernia post-natal pulmonary complications
- insufficient respiratory movements
- inadequate ventilation
- can be fixed with positive pressure ventilator support
- Pulmonary HTN
- since pulmonary vascular bed is underdeveloped
- the pulmonary vascular system remains a high resistance system
- even if available vessels dilate (normal)
- pHTN may be refractory due to poor vasculature development
- May need ECMO Extra Corporeal Membrane Oxygenation
Diaphragmatic hernia presentation

Diaphragmatic hernia Incidence and mortality
1:3000 births
high mortality depending upon severity
What is this?


Identify


Types of pulmonary HTN in an infant

Pulmonary HTN in an infant presentation

Pulmonary HTN in an infant lung compliance and volume
normal lung compliance / increased lung volume
Pulmonary HTN in an infant oxygenation
- worsening oxygenation with poor response to oxygen
- mechanical ventilation
- cascades to respiratory failure
Pulmonary HTN in an infant CXR
anywhere from abnormal to clear
Pulmonary HTN in an infant ECHO
indirect signs of Pulmonary HTN
Pulmonary HTN in an infant - pulmonary hypoplasia

Pulmonary HTN in an infant - PPHN

PPHN AKA
Persistent pulmonary hypertension of the newborn
Pulmonary HTN in an infant PPHN treatment
