Specialist nurse intervention to reduce unscheduled asthma care in a deprived multiethnic area: the east London randomised controlled trial for high risk asthma (ELECTRA).

Objective: To determine whether asthma specialist nurses, using a liaison model of care, reduce unscheduled care in a deprived multiethnic area.

Design: Cluster randomised controlled trial.

Setting: 44 general practices in two boroughs in east London.