Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Croup

—

In one line

·Croup is a viral infection that swells the airway just below the voice box, making a child's breathing sound like a seal barking.

—

Normal physiology

·The upper airway is a smooth, open tube that carries air from the nose and mouth down past the voice box (larynx) and into the windpipe (trachea), then into the lungs. In a young child, this tube is narrow—about the width of the child's pinky finger at its narrowest point, which is just below the voice box in an area called the subglottic space.

—

What goes wrong

·A virus (most often parainfluenza, but also RSV, influenza, adenovirus, or even a common cold virus) lands in the lining of the airway just below the voice box. The body's immune system recognizes the invader and sends white blood cells and fluid to the area to fight the infection. That immune response causes the soft tissue in the subglottic space to swell—like how your skin puffs up around a bug bite. Because a young child's airway is already narrow, even a few millimeters of swelling take up a large percentage of the open space. Air now has to squeeze through a much smaller hole, and fast-moving air through a narrow space makes noise—just like blowing through a tiny gap in your lips makes a whistle. That is why you hear the seal-bark cough and the high-pitched a high-pitched noise on breathing in (stridor) sound when the child breathes in.

—

Hallmark signs

·Barking cough (sounds like a seal)
·A high-pitched noise on breathing in (Stridor) (high-pitched breathing sound when breathing in)
·Hoarse voice or cry
·Runny nose and low fever (usually under 102°F)
·Chest wall retractions (skin pulls in between ribs or above collarbones when breathing)
·Restlessness or agitation
·A high-pitched noise on breathing in (Stridor) at rest (heard even when the child is calm and sitting still)
·Drooling or difficulty swallowing

—

Red flags · escalate now

·A high-pitched noise on breathing in (Stridor) at rest (high-pitched sound even when the child is calm)
·Severe chest retractions or the child looks like they are working very hard to breathe
·Blue or pale lips or skin (sign of low oxygen)
·Drooling or unable to swallow (suggests a more dangerous throat blockage)
·The child is very sleepy, limp, or hard to wake up

—

Workup

·Clinical diagnosis (no tests needed in typical mild croup)
·Pulse oximetry (oxygen saturation)
·Anteroposterior (AP) neck X-ray (only if diagnosis is unclear)
·Lateral neck X-ray (only if epiglottitis is suspected)
·Respiratory viral panel (PCR or rapid antigen, rarely done)

—

Treatment

·Dexamethasone 0.6 mg/kg by mouth or IM injection (single dose, maximum 10 mg)
·Nebulized racemic epinephrine (0.5 mL of 2.25% solution in 3 mL saline) for moderate-to-severe croup; watch the child for 3 to 4 hours afterward
·Keep the child calm and comfortable in a caregiver's lap; avoid upsetting the child or doing unnecessary exams
·Cool mist from a humidifier or sitting in a steamy bathroom during episodes (traditional home remedy)
·Send to the hospital if a high-pitched noise on breathing in (stridor) continues at rest after epinephrine wears off, oxygen level stays below 90 to 92%, or the child looks exhausted from breathing hard
·Rule out epiglottitis, bacterial tracheitis, and foreign body (toy or food stuck in airway) by careful history and exam—do NOT force the child to lie down or stick a tongue blade in the throat if epiglottitis is possible

—

NCLEX trap

·Croup is caused by a virus (usually parainfluenza). Viruses do not respond to antibiotics. The right treatment is dexamethasone (a steroid medicine) to shrink the swelling in the airway. Only give antibiotics if you suspect a bacterial infection instead — like epiglottitis (infection of the flap above the windpipe), bacterial tracheitis (bacteria in the windpipe itself), or pneumonia (infection in the lungs).
·Look at the whole picture. Epiglottitis makes the child drool, sit forward leaning, and unable to swallow — the airway is blocked higher up. Croup has a seal-bark cough, hoarse voice, and inspiratory a high-pitched noise on breathing in (stridor) (noisy breathing when air comes IN) — the swelling is lower, around the voice box. A foreign body (swallowed object) causes sudden choking with no cold symptoms first. Each problem has a different upstream cause.
·Keep the child calm, sitting upright in the parent's lap. Upsetting or agitating the child makes the swelling worse, narrows the airway more, and can turn mild croup into severe croup. You can hear the seal-bark cough and a high-pitched noise on breathing in (stridor), see chest retractions, and check oxygen without forcing the child to cry. Never use a tongue blade in suspected epiglottitis — it can cause complete airway blockage.
·Mild croup (no a high-pitched noise on breathing in (stridor) at rest, no retractions, normal oxygen, child is calm and drinking) can be managed at home after one dose of dexamethasone by mouth (0.6 mg/kg, usually 10 mg for most kids). Watch closely for worsening — a high-pitched noise on breathing in at rest, low oxygen, chest pulling in hard, trouble breathing, or the child looks exhausted. Send to the hospital only if the child has moderate-to-severe symptoms or does not improve after dexamethasone.
·Cool mist or humidified air may soothe the child and feel comforting, but studies show it does NOT reduce airway swelling or shorten croup. Dexamethasone (steroid) is the proven treatment — it shrinks inflammation and cuts hospital admission by half. Racemic epinephrine (inhaled breathing medicine) works fast for moderate-to-severe croup but wears off in 2 hours. Cool mist is optional comfort; dexamethasone is the real fix.
·Most croup does improve on its own over 3 to 5 days, but dexamethasone speeds recovery, reduces symptoms within 6 hours, and lowers the chance the child will need emergency care or hospitalization. Current guidelines (AAP, Cochrane) recommend giving dexamethasone to every child with croup, even mild cases. It is safe, effective, and prevents worsening.

—

Install Maldek by Hill as an app — studies work even offline