Chronic asthma

Question 1

What is asthma?
Associated with?

Answer 1

Asthma is a chronic inflammatory airway disease leading to variable airway obstruction. The smooth muscle in the airways is hypersensitive, and responds to stimuli by constricting and causing airflow obstruction. This bronchoconstriction is reversible with bronchodilators such as inhaled salbutamol.

Asthma is one of a number of atopic conditions, which include asthma, eczema, hay fever and food allergies. Patients with one of these conditions are more likely to have others. These conditions characteristically run in families, so always ask about family history and don’t be surprised if their brother, mother or “everyone in the family” has asthma, eczema and allergies.

Question 2

Presentation of chronic asthma?

Answer 2

Presentation Suggesting a Diagnosis of Asthma

Episodic symptoms with intermittent exacerbations
Diurnal variability, typically worse at night and early morning
Dry cough with wheeze and shortness of breath
Typical triggers
A history of other atopic conditions such as eczema, hayfever and food allergies
Family history of asthma or atopy
Bilateral widespread “polyphonic” wheeze heard by a healthcare professional
Symptoms improve with bronchodilators

Question 3

What features would suggest a diagnosis other than asthma?

Answer 3

Wheeze only related to coughs and colds, more suggestive of viral induced wheeze
Isolated or productive cough
Normal investigations
No response to treatment
Unilateral wheeze suggesting a focal lesion, inhaled foreign body or infection

Question 4

Typical asthma triggers?

Answer 4

Dust (house dust mites)
Animals
Cold air
Exercise
Smoke
Food allergens (e.g. peanuts, shellfish or eggs)

Question 5

How is asthma diagnosed?

Answer 5

Diagnosis of Asthma

There is no gold standard test or diagnostic criteria for asthma. A diagnosis is made clinically based on a typical history and examination. Children are usually not diagnosed with asthma until they are at least 2 to 3 years old. When there is a low probability of asthma and the child is symptomatic, consider referral to a specialist for diagnosis.

When there is an intermediate or high probability of asthma, a trial of treatment can be implemented and if the treatment improves symptoms a diagnosis can be made.

There are investigations that can be used where there is an intermediate probability of asthma or diagnostic doubt:

Spirometry with reversibility testing (in children aged over 5 years)
Direct bronchial challenge test with histamine or methacholine
Fractional exhaled nitric oxide (FeNO)
Peak flow variability measured by keeping a diary of peak flow measurements several times a day for 2 to 4 weeks

Question 6

Long term management of asthma in children?

Answer 6

USE PASSMED!!!

Start a short-acting beta-2 agonist inhaler (e.g. salbutamol) as required
Add a regular low dose corticosteroid inhaler
Add a long-acting beta-2 agonist inhaler (e.g. salmeterol). Continue salmeterol only if the patient has a good response.
Titrate up the corticosteroid inhaler to a medium dose. Consider adding:
Oral leukotriene receptor antagonist (e.g. montelukast)
Oral theophylline
Increase the dose of the inhaled corticosteroid to a high dose.
Referral to a specialist. They may require daily oral steroids.

Medical Therapy Aged Over 12 Years (Same as Adults)

Start a short-acting beta 2 agonist inhaler (e.g. salbutamol) as required
Add a regular low dose corticosteroid inhaler
Add a long-acting beta-2 agonist inhaler (e.g. salmeterol). Continue salmeterol only if the patient has a good response.
Titrate up the corticosteroid inhaler to a medium dose. Consider a trial of an oral leukotriene receptor antagonist (i.e. montelukast), oral theophylline or an inhaled LAMA (i.e. tiotropium).
Titrate the inhaled corticosteroid up to a high dose. Combine additional treatments from step 4, including the option of an oral beta 2 agonist (i.e. oral salbutamol). Refer to specialist.
Add oral steroids at the lowest dose possible to achieve good control under specialist guidance.

Question 7

Inhaled corticosteroids discussion with parents?

Answer 7

A potential exam scenario is discussing inhaled steroids with a parent that is worried about potential side effects. A common question is whether they slow growth. There is evidence that inhaled steroids can slightly reduce growth velocity and can cause a small reduction in final adult height of up to 1cm when used long term (for more than 12 months). This effect was dose-dependent, meaning it was less of a problem with smaller doses.

It is worth putting this in context for the parent by explaining that these are effective medications that work to prevent poorly controlled asthma and asthma attacks that could lead to higher doses of oral steroids being given. Poorly controlled asthma can lead to a more significant impact on growth and development. The child will also have regular asthma reviews to ensure they are growing well and on the minimal dose required to effectively control symptoms.

Question 8

Poor inhaler technique asthma?

Answer 8

The better the technique, the more medication reaches the lungs. Poor technique results in medication in the mouth or the back of the throat. This reduces the effectiveness of the medication and leads to complications such as oral thrush with steroid inhalers.

Ideally, inhalers should be used with a spacer device to maximise their effectiveness.

Question 9

Salbutamol metered dose inhaler (MDI) technique?

Answer 9

MDI technique without a spacer:

Remove the cap
Shake the inhaler (depending on the type)
Sit or stand up straight
Lift the chin slightly
Fully exhale
Make a tight seal around the inhaler between the lips
Take a steady breath in whilst pressing the canister
Continue breathing for 3 – 4 seconds after pressing the canister
Hold the breath for 10 seconds or as long as comfortably possible
Wait 30 seconds before giving a further dose
Rinse the mouth after using a steroid inhaler

MDI technique with a spacer:

Assemble the spacer
Shake the inhaler (depending on the type)
Attach the inhaler to the correct end
Sit or stand up straight
Lift the chin slightly
Make a seal around the spacer mouthpiece or place the mask over the face
Spray the dose into the spacer
Take steady breaths in and out 5 times until the mist is fully inhaled
Alternatively exhale fully before making a seal with the spacer, spray the dose and take one deep breath in to inhale the mist in one breath before holding for 10 seconds.

Spacers should be cleaned once a month. Avoid scrubbing the inside and allow them to air dry to avoid creating static. Static can interact with the mist and prevent the medication being inhaled.

TOM TIP: Teaching inhaler technique is a common exam task, so practice with colleagues. It is important to check inhaler technique during asthma review. If you come across a poorly controlled asthmatic who states they are taking their inhalers as prescribed, consider whether their inhaler technique is adequate, as this may be the cause of their poor asthma control.