Anyone who’s spent more than a handful of shifts in the Pediatric Emergency Department can easily recognize that unmistakable, seal-like barking cough from across the unit. Cue the music!
Croup is bread-and-butter pediatric emergency medicine: high-yield, high-frequency, and often straightforward. And yet, these kids demand our respect every single time…cause when they’re sick, they’re really sick.
Children can look relatively comfortable one moment, then become agitated and quickly tip into significant respiratory distress the next. And honestly, I don’t blame them. They’re fighting a fever, they’re probably hangry, and they’re terrified – simultaneously squirming or swatting Mom (and you) away as you try to examine them, all while battling a viral-induced upper airway obstruction. A frightened child becomes tachypneic, generating increasingly negative intrathoracic pressure that further narrows the already inflamed subglottic airway during inspiration.
But in the midst of all that noise, your next job is to listen carefully for one specific sound…stridor at rest.
To complicate matters further, croup management algorithms can vary not only between individual clinicians but also across hospital systems. Thresholds differ for cornerstone interventions, including when to initiate racemic epinephrine, dosing frequency, and steroid selection or dosing strategies. Even post-therapy observation periods and disposition decisions remain subjects of debate.
Despite this variability in practice, the underlying physiology remains the same. Understanding croup well is what allows us to practice confidently, safely, and efficiently – so that when those familiar notes of barky cough and stridor begin to play, we know exactly how to respond.
So let’s get into the pathophysiology:
Croup, also known as viral laryngotracheitis, is characterized by acute inflammation and edema of the larynx and subglottic region – the narrowest portion of the pediatric upper airway. The classic triad of a seal-like barking cough, inspiratory stridor, and hoarseness should be familiar territory. The usual culprits are viral, with parainfluenza as the rock star.
Croup is most common in the fall and winter, with peak incidence between 6 and 36 months of age. Cases are less common after kindergarten and in infants younger than 3 months; when they occur in these groups, they should prompt a broader evaluation – so be careful not to anchor. The illness typically begins with upper respiratory symptoms, making that piece of the parental history an important early clue. Imaging is usually unnecessary, but a neck X-ray can be helpful when the diagnosis is unclear, standard therapy isn’t working, or a foreign body is suspected. The classic finding is the “steeple sign,” reflecting subglottic narrowing of the airway.
The clinical nuance lies in recognizing severity: stridor at rest, retractions, agitation, hypoxia, and fatigue. We’ll get into that next…stay tuned.
Coming Soon…PART 2: SCORING THE SEVERITY
Dr. Katheryn Cireseanu is a Pediatric Emergency Medicine Fellow at NewYork-Presbyterian Morgan Stanley Children’s Hospital/Columbia University Irving Medical Center. She can be reached at kc3901@cumc.columbia.edu.
