Asthma and Reactive Airway Disease

Asthma is a chronic inflammatory disorder of the airways characterised by variable respiratory symptoms — wheeze, breathlessness, chest tightness, and cough — together with variable expiratory airflow limitation that often reverses spontaneously or with treatment. "Reactive airway disease" is a loosely used clinical descriptor for airway hyperresponsiveness and wheeze that may overlap with asthma. For respiratory nursing, asthma is a long-term condition defined by symptom variability, airway hyperresponsiveness, and the risk of acute exacerbations.

Definition

Asthma is a heterogeneous disease usually characterised by chronic airway inflammation, defined by a history of variable respiratory symptoms (wheeze, shortness of breath, chest tightness, cough) together with variable expiratory airflow limitation, as set out in the GINA strategy (Reddel et al., 2021).

Scope

This entry covers asthma as a clinical entity within respiratory nursing: its definition by variable symptoms and reversible airflow limitation, the inflammatory mechanisms involved, the role of triggers and exacerbations, and the GINA strategy that frames assessment and care. It is reference and educational material and does not give dosing or individualised treatment instructions.

Core questions

• What makes asthma's airflow limitation variable and often reversible?
• How does airway inflammation produce hyperresponsiveness and symptoms?
• What is meant by an asthma exacerbation and why does it matter for assessment?
• How does the GINA strategy frame asthma assessment and monitoring?

Key concepts

• Variable airflow limitation
• Airway hyperresponsiveness
• Chronic airway inflammation
• Triggers and allergens
• Exacerbations
• Reversibility and symptom variability
• Asthma control and self-management
• GINA assessment framework

Mechanisms

In asthma, chronic inflammation of the airways — frequently involving eosinophils and type 2 immune pathways, though several inflammatory patterns exist — leads to airway hyperresponsiveness, so that the airways narrow excessively in response to triggers such as allergens, viral infections, exercise, or irritants. The resulting bronchoconstriction, mucosal oedema, and mucus secretion produce variable, often reversible airflow limitation and the characteristic episodic symptoms; over time, airway remodelling may contribute to more persistent obstruction in some patients (Papi et al., 2018).

Clinical relevance

Asthma is a common reason for respiratory and emergency nursing care, both for routine review of symptom control and for acute exacerbations that can become life-threatening. The entry describes the condition and its guideline context to support assessment and patient education; it is not a basis for prescribing, titrating, or delivering specific treatments.

Epidemiology

Asthma is one of the most common chronic respiratory diseases worldwide, affecting children and adults across all regions, with substantial variation in prevalence and severity; the GINA strategy documents its global burden, and exacerbations remain a major source of morbidity, healthcare use, and, in severe cases, mortality (Reddel et al., 2021; Papi et al., 2018).

Evidence & guidelines

The Global Initiative for Asthma (GINA) strategy is the principal international framework defining asthma and structuring its assessment and stepwise management (Reddel et al., 2021). For acute severe exacerbations, the British Thoracic Society oxygen guideline frames targeted oxygen use to defined saturation ranges (O'Driscoll et al., 2017). These documents describe evidence and recommendations at the level of care organisation rather than individualised orders.

Seminal works

• reddel-2021-gina
• papi-2018-asthma

Frequently asked questions

How does asthma differ from COPD?

Asthma is characterised by variable, often reversible airflow limitation and airway hyperresponsiveness, whereas COPD is defined by persistent, incompletely reversible airflow limitation; the two can overlap in some patients.

Is 'reactive airway disease' the same as asthma?

Not exactly; it is a loose clinical descriptor for airway hyperresponsiveness and wheeze that may overlap with asthma but is not a precise diagnostic term.