Tiny Lungs, Big Problems
What does “BPD” stand for, and which group of infants does it mainly affect?
Bronchopulmonary dysplasia — a chronic lung disease that mainly affects premature infants, especially those born extremely preterm or with very low birth weight.
Into which mainstem bronchus are aspirated foreign bodies most commonly lodged in older children and adults?
The right mainstem bronchus, because it is wider and more vertically aligned with the trachea. In younger children, bronchial anatomy is more symmetric, so laterality is less predictable.
In simple terms, what is pulmonary hypertension?
Abnormally elevated pressure within the pulmonary circulation, increasing the workload on the right side of the heart.
What is the most common trigger for recurrent wheezing in preschool-aged children?
Viral respiratory infections, particularly rhinovirus and other common respiratory viruses.
What does “chILD” stand for?
Childhood Interstitial Lung Disease, also called childhood diffuse lung disease — a group of rare disorders affecting the alveoli, interstitium, small airways, pulmonary vasculature, or combinations of these structures.
What is the basic definition of BPD in terms of oxygen or respiratory support?
A premature infant who continues to require supplemental oxygen and/or respiratory support around 36 weeks postmenstrual age is considered to have BPD, with severity determined by the amount of support required.
What is the most commonly aspirated category of foreign body in toddlers?
Organic food material, especially nuts and seeds. Peanuts are a classic example.
Which cardiac chamber is most affected by pulmonary hypertension, and what can happen over time?
The right ventricle. Chronic pressure overload can cause right ventricular hypertrophy, dilation, dysfunction, and eventually right-sided heart failure.
What medication provides rapid relief during an acute preschool wheezing episode?
An inhaled short-acting beta₂-agonist, usually albuterol.
What clinical findings should make you consider chILD in an infant or child?
Persistent tachypnea, retractions, hypoxemia, chronic cough, crackles, exercise intolerance, and/or poor growth, especially when common pulmonary or cardiac diseases do not explain the presentation.
Name two major factors that contribute to the development of BPD.
Extreme prematurity and lung injury from mechanical ventilation and oxygen exposure. Other contributors include infection/inflammation, pulmonary edema, and altered lung development.
A child with suspected foreign body aspiration has a normal inspiratory chest X-ray. What additional radiographic technique may demonstrate an occult airway obstruction?
Expiratory films or bilateral lateral decubitus films may demonstrate unilateral air trapping or hyperinflation. A normal chest X-ray does not exclude foreign body aspiration.
What is the most commonly used noninvasive screening study for pulmonary hypertension in children?
Echocardiography, which estimates pulmonary pressures and evaluates right ventricular size and function.
A 3-year-old wheezes only during respiratory infections and is completely asymptomatic between illnesses. What wheezing pattern does this suggest?
Episodic viral-induced wheezing — wheezing associated with viral infections with few or no symptoms between episodes.
After common causes are excluded, how many of the four major criteria are needed to meet the classic definition of chILD syndrome in infancy?
At least 3 of 4:
Name one common medication used in premature infants that helps reduce the risk of BPD and explain why.
Caffeine citrate — it treats apnea of prematurity, facilitates earlier extubation, reduces duration of mechanical ventilation, and is associated with a lower incidence of BPD.
What is the diagnostic and therapeutic gold-standard procedure for a retained airway foreign body?
Rigid bronchoscopy under general anesthesia.
What does “PPHN” stand for, and in whom does it occur?
Persistent Pulmonary Hypertension of the Newborn. It occurs when pulmonary vascular resistance fails to fall normally after birth, causing right-to-left shunting and hypoxemia.
preschool child has recurrent viral-triggered wheezing but no symptoms between infections. What preventive strategy can be considered at the onset of a respiratory infection?
A short course of daily inhaled corticosteroid, typically for about 7–10 days, started at the beginning of the respiratory illness, along with as-needed albuterol in appropriately selected children.
What is the preferred imaging modality when childhood diffuse lung disease is suspected, and name two additional diagnostic tools that may be needed.
High-resolution or thin-section chest CT. Additional evaluation may include genetic testing, echocardiography, bronchoscopy with BAL, pulmonary function testing, or lung biopsy.
Why are surfactant and lung-protective ventilation important in reducing BPD? Explain physiology
Surfactant improves lung compliance and reduces the oxygen and pressure needed for ventilation. Lung-protective strategies such as CPAP and low tidal-volume ventilation minimize volutrauma, barotrauma, and oxygen toxicity that contribute to BPD.
A stable child has a convincing history of foreign body aspiration but normal chest radiographs. What imaging may be considered, and when should imaging be skipped?
Low-dose thin-section chest CT can help identify a radiolucent foreign body or secondary airway changes in a stable patient. If the child has severe respiratory distress or a highly convincing acute presentation, do not delay bronchoscopy for CT.
What inhaled medication is commonly used for severe PPHN, and how does it work?
Inhaled nitric oxide (iNO) — a selective pulmonary vasodilator that decreases pulmonary vascular resistance and improves pulmonary blood flow and oxygenation.
A 4-year-old previously labeled as having “viral wheezing” now develops nighttime cough, exercise-related wheezing, and symptoms when not sick. What does this suggest?
The child may now have persistent asthma rather than isolated viral-induced wheezing. The patient should be reassessed for persistent symptoms, atopy, triggers, inhaler technique, adherence, and the need for regular controller therapy such as an inhaled corticosteroid.
An infant has persistent tachypnea, retractions, hypoxemia, and crackles. CT shows geographic ground-glass opacities most prominent in the right middle lobe and lingula with associated air trapping. What diagnosis should you suspect?
Neuroendocrine Cell Hyperplasia of Infancy — NEHI.