BTS Guidelines

Moderate asthma exacerbation

  • Increasing symptoms
  • PEF > 50-75% predicted
  • No features of acute severe asthma

Acute severe asthma
Any one of:

  • PEF 33-50% best or predicted
  • Respiratory rate ≥ 25/min
  • Tachycardia (≥ 110 bpm)
  • Inability to complete sentences in one breath

Life-threatening asthma
Any one of:

  • PEF < 30%
  • SpO2 < 92%; PaO2 < 8 kPa
  • Normal PaCO2 (4.6-6 kPa)
  • Silent chest
  • Cyanosis
  • Poor respiratory effort (i.e. giving up)
  • Arrhythmia (e.g. tachycardia)
  • Exhaustion, altered consciousness level

Near fatal asthma
Raised PaCO2 and/or requiring mechanical ventilation with raised inflation pressure.



Print
Listed in Cases