Further investigation and monitoring
This content is from the BTS/SIGN British guideline on the management of asthma (SIGN 158), 2019.
- Measure and record PEF 15–30 minutes after starting treatment, and thereafter according to the response. Measure and record PEF before and after nebulised or inhaled β2 agonist.
- Record oxygen saturation by oximetry and maintain arterial SpO2 at 94–98%.
- Repeat measurements of blood gas tensions within one hour of starting treatment if:
- the initial PaO2 is <8 kPa unless SpO2 is >92%; or
- the initial PaCO2 is normal or raised; or
- the patient’s condition deteriorates.
[BTS/SIGN 2019]
- Measure them again if the patient’s condition has not improved by 4–6 hours.
- Measure and record the heart rate.
- Measure serum potassium and blood glucose concentrations.
- Measure the serum theophylline concentration if aminophylline is continued for more than 24 hours (aim for a concentration of 10-20 mg/L or 55-110 micromol/L).
[BTS/SIGN 2019]