Objective: To evaluate the effectiveness of morphine aerosols in the treatment of dyspnoea in the palliative care of patients with lung cancer.
Materials and methods: During a randomised, double blind, cross-over study 12 patients receiving palliative care for lung cancer and suffering from dyspnoea despite conventional treatments were given, for two periods of 48 hours separated by a 24 hour wash-out period, 4 mls of morphine sulphate and 4 mls of normal saline 4 hourly by a jet nebuliser. Before and after each nebulisation respiratory rate and capillary oxygen saturation were measured and dyspnoea was quantified with the aid of a visual analogue scale by the patient and various other observers (doctors, students, nurses, care assistants and physiotherapists).
Results: The aerosols of normal saline and morphine produced the same improvements in the dyspnoea scores independently of the mass nebulised. Furthermore the nebulisations did not produce any significant change in respiratory rate or oxygen saturation.
Conclusion: The fact that both aerosols lead to a similar improvement in dyspnoea scores suggests that humidification of the airways rather than a pharmacological action may be beneficial in the treatment of dyspnoea in terminally ill patients.