Acute severe and life-threatening asthma

Overview & Definition

Picture the eight-year-old carried into the resus bay hunched forward, too breathless to answer you, using every accessory muscle, with a chest that is wheezing everywhere and oxygen saturations of 88% on air. His mother says his reliever stopped working an hour ago. That scene — a child in obvious respiratory distress from asthma who is no longer responding to their usual treatment — is acute severe asthma, and the speed and order of what you do next decides whether he improves or arrests. [1] [11]

Acute severe asthma is an exacerbation of asthma severe enough that inhaled bronchodilator alone is failing and the child shows objective signs of serious airflow limitation: inability to talk in sentences, marked work of breathing, tachypnoea and tachycardia, and hypoxaemia. Life-threatening asthma is the next tier — a silent chest, poor respiratory effort, cyanosis, exhaustion, confusion or hypotension — and near-fatal asthma describes the child with a raised PaCO₂ who needs mechanical ventilation. [1] [12]

Why this matters at fellowship level is that asthma is one of the commonest paediatric emergencies, most exacerbations respond well to prompt inhaled therapy and steroid, and the deaths are largely preventable — they cluster in children whose severity was underestimated, whose treatment was delayed, or whose deterioration was misread. The skill being tested is recognising severity early, escalating in the right order, and never mistaking a fading child for a recovering one. [11] [12]