Introduction 

Croup is a condition that can affect the airways of younger children and babies; this can lead to harsh coughs and stridors when breathing in, bronchitis is a condition leading to irritation and inflammation of the airways, which can affect anyone at any age.

While these conditions can look similar, it is important to identify and differentiate the two to offer the best treatment to whoever is affected and intervene at the best moment.

So, Let us dive into the differences between croup and bronchitis.

Causes 

Croup

Viral causes

Croup is an illness forming in the trachea, larynx and bronchi, which includes also laryngotracheobronchitis and laryngotracheobronchopneumonitis.

Croup can have viral cause, some examples can be:

• Parainfluenza, a virus that can cause viral croup or acute laryngotracheitis
• Influenza, Measles, Adenoviruses and Respiratory syncytial virus
• Spasmodic croup: which is caused by viruses which can also lead to laryngotracheitis

Bacterial causes

Bacterial croup can be categorised as bacterial tracheitis, laryngeal diphtheria, laryngotracheobronchitis and Laryngotracheobronchitis 

• Laryngeal diphtheria can be caused by the bacteria Corynebacterium diphtheria
• Bacterial tracheitis, laryngotracheobronchitis, and Laryngotracheobronchitis usually origin from viruses but progress and worsen as bacterial
• Common bacteria causing bacterial croup are Staphylococcus aureus, Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis

Bronchitis

Acute bronchitis

Acute bronchitis is a common form of infection, an aderious condition usually affecting adults, it presents itself through persistent cough but usually resolves 1 to 3 weeks after infection.

Bronchitis is most commonly triggered by viral infections which can include

• Common cold or influenza viruses
• Adenovirus
• Rhinovirus

However bronchitis can also be caused by bacteria, this is less frequent and happens in only 10% of cases, the most common bacterial causes can be

• Mycoplasma pneumoniae
• Chlamydia pneumonia 
• Bordetella pertussis

Other causes have been connected to irritants such as smoke, dust, contaminated air and environmental pollutants, allergens can also trigger inflammatory responses, which can lead to the start of bronchitis symptoms.

Bronchitis can also be Chronic when lasting more than 3 months in a span of 2 years, and it has a strong association with cigarette smoke due to active smoking or inhalation, other irritants such as environmental pollution can also play a role.

Clinical presentation

Croup

Ages

Croup usually affects young children, with parainfluenza causing more than 75% of cases and can affect boys more frequently than girls.

Croup can affect children between six months and 3 years, however, most cases occur in one-year-olds.

In less frequent cases, croup can affect older children up to 15 years old, however, in adulthood, croup is extremely rare.

Croup Is usually very mild, and only 1% of cases turn into severe croup

Symptoms

Croup causes swelling in the larynx, trachea, and bronchi which can lead to obstruction of the airways, this can lead to symptoms such as

• Barking cough
• Stridor
• Hoarseness
• Fever

Duration

Croup can improve after 48 hours from the appearance of symptoms in most cases, in others however it can take up to 2 weeks to improve.

It is very rare for children to die from this condition.

Bronchitis

Age group

Bronchitis can affect people of all ages, however, chronic bronchitis affects people older than 50.

Symptoms

Bronchitis symptoms include

Persistent cough (with or without mucus)

• Wheezing
• Chest discomfort
• Sore throat runny nose
• High-temperature

Duration

Bronchitis when caused by an infection usually improves after around 3 weeks from the appearance of symptoms.

Diagnosis

Croup

Clinical diagnosis

Croup can be diagnosed, by history and symptoms by the GP. The GP might check the sound of the cough, temperature and if the child has had viruses or colds.

Oximetry might be carried out. This test helps doctors identify oxygen levels, and it works by applying a clipping sensor to the child's earlobe or finger.

After evaluation, the doctor will decide whether to admit the patient or whether the condition is mild enough to be treated at home.

In more severe cases or if treatment is not working as expected, the doctor might want to investigate the neck and chest to identify possible obstructions and an X-ray might be recommended. In that case, the X-ray might highlight other conditions such as

• an abnormality of the airway, which has been present from birth
• an abscess in the tissues in the back of the throat
• Inhaled material (something they have breathed in)
• Swelling of the deeper layers of the skin (angioedema)
• Epiglottitis
• Congenital lesion
• an allergic reaction

Bronchitis

Clinical diagnosis 

Bronchitis can be diagnosed by checking medical history, and carrying out a physical examination. The doctor will evaluate, oxygen levels, pulse rate, temperature and breathing speed which are essential to understand the severity of the condition.

X-ray tests, for people with acute bronchitis, can appear normal, however in some cases x rays can reveal a thickening of the walls of the airways which can indicate bronchitis.

Chest X-rays should be carried out when

• Heart rate is above 100 bpm
• Respiratory rate is above 24 breaths/min
• Temperature is over 38°C

In cases of suspected bacterial origin in the infection, different laboratory tests might be carried out to identify specific bacteria such as B pertussis, M pneumoniae, or C pneumonia.

Treatment

Croup

Treatment for croup can depend on the severity of each case

Mild cases

In most cases the severity of croup is mild, in these cases, children might be given a single dose of corticosteroids such as dexamethasone or prednisolone to reduce throat swelling, and

mild cases can be treated at home.

It is important to comfort the child, as crying might make symptoms worsen, it is also important to make the child drink a lot of water to prevent dehydration.

Moderate cases or severe cases

In moderate cases or severe cases, the doctor might decide to give the child some epinephrine, adrenaline, or oxygen to control breathing, these treatment are usually carried out in a hospital.

Antibiotics are not commonly prescribed as croup is mostly a viral condition, when the infection is suspected to be bacterial antibiotics can be prescribed.

Bronchitis

Acute bronchitis

Treatment for acute bronchitis focuses on providing relief for symptoms and supportive therapies

• Nonpharmacological therapies, hot tea, honey, ginger, throat lozenges
• Pharmacological therapies, antitussive agents, steroids for inflammation, bronchodilators with asthma and COPD

The use of antibiotics is not recommended in healthy adults with uncomplicated bronchitis as it does not provide increased benefits.

Chronic bronchitis

In cases of chronic bronchitis, the aims is still to relieve symptoms and slow the disease progression

Pharmacological therapies include

• Bronchodilators
• Glucocorticoids, to reduce inflammation and production of mucus
• Antibiotic therapy, in particular macrolide therapy which has anti-inflammatory properties
• Phosphodiesterase-4 inhibitors, to reduce inflammation and promote relaxation of the smooth muscle of the airways

Nonpharmacological therapies

• Smoke cessation, to reduce injury of the lungs
• Pulmonary rehabilitation, consists of education, lifestyle modification, regular physical activity, and avoidance of exposure to pollutants

Outcome

Croup

Croup is a self-limiting disease, which means the disease can resolve without treatment and can be cured in a few days, there can be complications such as bacterial tracheitis, pneumonia, and pulmonary edema however these are uncommon.

Bronchitis

 Acute Bronchitis Is defined as self-limiting, and improves by taking care of the symptoms over 1 to 3 weeks, however complications such as pneumonia are possible.

Chronic Bronchitis cannot be cured or reversed, but treatment can be helpful to control the symptoms and improve the quality of life of those who are affected. In certain cases symptoms might continue to worsen leading to life-threatening problems.

Prevention

Croup

• Croup can be prevented, just like a cold can be prevented
• Washing hands
• Keeping the child away from sick people
• Cleaning touched surfaces
• Coughing or sneezing in the elbow
• Vaccination against diphtheria snd influenza

 Bronchitis

• The risk of bronchitic can be reduced by
• Avoiding cigarettes and smoke
• Vaccination against influenza yearly
• Washing hands frequently

Summary

In conclusion, Bronchitis and Croup are two very different condition that causes respiratory problems, it is crucial to understand the differences between the two to provide the best treatment and care.

Croup mainly affects the airways of little children leading to harsh cough and stridors when breathing, while bronchitis is mainly inflammation and irritation of the airways.

Both conditions are mainly triggered by viral causes such as influenza or adenoviruses, however, while bacterial causes are more frequent in crop, bacterial bronchitis is very uncommon.

The biggest difference can be noticed in age, as croup mainly affects children between six months and 3 years of age, while bronchitis can affect any individual of any age, with chronic bronchitis affecting people over 50.

Understanding these differences can help obtain the right diagnosis and treat the symptoms in the best way.