What is croup?

Children often encounter various infections during their growth and it is important to treat them at the earliest in order to prevent further complications. One among them is croup. So, what is croup and how can it be treated? Come read this article! Croup article! 

Croup is a highly contagious respiratory ailment primarily affecting newborns and young children. The disorder causes enlargement in the child's voice box (larynx) and windpipe (trachea), resulting in symptoms such as a distinctive barking cough and rough breathing. Viral infections are the most common cause of this disease. The swelling narrows the airway behind the vocal cords, making breathing noisy and uncomfortable. Croup is normally moderate, but the symptoms can be severe and life-threatening. Croup is most frequent in infants and children under three years old and less common among adults. This is because their windpipes are? larger, making swelling less likely to obstruct their breathing.

Causes and symptoms of croup

Croup viruses include parainfluenza, influenza, RSV, measles, and adenovirus. Viral croup creates swelling in the child's upper airways, making it difficult for them to breathe. However, these viruses are widespread, and most children with viral infections do not develop croup. Bacteria can, on rare occasions, exacerbate the viral illness and make breathing harder. Croup is usually minor and lasts less than a week, although the symptoms can become more severe. Symptoms typically appear slowly and may begin with a runny or stuffy nose. Over the next 12 to 48 hours, symptoms may increase and a barking cough may develop. Symptoms frequently worsen at night. The mild and moderate symptoms includes;

Mild symptoms

• Hoarseness.
• Fever
• Rash
• Eye redness

Moderate symptoms

• Difficulty breathing
• Nervousness
• Retractions (sucking in the skin around the child’s ribs and the top of their breastbone)
• Cyanosis (blue-tinged skin)¹
  If you find any mild or moderate symptoms in your child’s breathing, contact a healthcare provider immediately.

Diagnosis and treatment

Croup is often diagnosed by a healthcare provider. 

• The first thing is observing the child breathing with a stethoscope
• Examine the child's throat
• X-rays or other testing may be conducted to rule out other illnesses²

Medications for treating croup

The two class of medications for the treatment of croup includes:

• Corticosteroids 
• Nebulized epinephrine

Corticosteroids

Corticosteroids' anti-inflammatory effect decreases laryngeal mucosal swelling and the requirement for salvage nebulized epinephrine. It also improves croup scores within 12-24 hours of administration and reduces hospitalisation rates in moderate to severe cases. The different steroids used includes:

• Dexamethasone
• Prednisone
• Prednisolone
• Budesonide

Studies indicate that dexamethasone, prednisone and prednisolone improve clinical symptoms and the croup score in hospitalised and Emergency patients. The drug's anti-inflammatory activity reduces laryngeal mucosal edema. The onset of action is within 6 hours of oral or intramuscular injection. Dexamethasone has an extended pharmacodynamic effect (36-56 hours). When determining the proper dosage of prednisone and prednisolone, it is crucial to consider that dexamethasone is 6.67 times more effective and has a longer half-life of 36–56 hours, while prednisone has a median half-life of 18–36 hours. Clinical studies have documented improvement in symptoms and a decrease in hospital admissions with nebulized budesonide in children with croup. Inhaled budesonide has been shown in several studies to be equivalent to oral dexamethasone.

Nebulized epinephrine

Epinephrine activates alpha and beta2 receptors. It constricts the precapillary arterioles, which reduces airway edema. Because of the risk of tachycardia( increased heart beat) and hypertension, it is only used on children with moderate to severe illness. It stimulates alpha-, beta1-, and beta2-adrenergic receptors, causing bronchodilation, increased peripheral vascular resistance, hypertension, enhanced heart activity, and beneficial inotropic effects. Epinephrine induces alpha-adrenergic receptor-mediated vasoconstriction of edematous tissues, reversing upper airway edema.³

Precautions

In individuals with croup, proper corticosteroid medication has not been linked to any negative effects. Although the adverse effects associated with single-dose corticosteroids are extremely minimal, children who have diabetes mellitus, have been exposed to the varicella virus, or are at risk of bacterial superinfection should take these factors into account. Children who need regular treatments with an epinephrine nebulizer should have their heart health carefully monitored for any negative consequences. The therapeutic advantage of epinephrine usually manifests itself during the first half an hour when taken in any form. Given that this advantage usually lasts for up to two hours, it could be preferable to assess for disposition a few hours after the last epinephrine dosage.⁴

Summary

Croup is a respiratory infection that mainly affects infants and children below the age of five. It is mainly due to viral or bacterial organisms. The main symptoms for croup include barking cough and difficulty in breathing in severe cases. The medications include steroids and nebulizer epinephrine. Take the necessary precautions while taking the medication and follow the proper dosage regimen. If your child experiences any of these symptoms, contact a healthcare provider immediately.