Randomised controlled trial of treating dysfunctional breathing to reduce breathlessness in severe asthma

INTERVENTION: 1. Patients will undergo breathing retraining with senior physiotherapist 2. Control CONDITION: Respiratory: Asthma ; Respiratory ; Asthma PRIMARY OUTCOME: Change in University of California San Diego Shortness‐of‐Breath Questionnaire (SOBQ) score after treatment for dysfunctional breathing SECONDARY OUTCOME: Not provided at time of registration INCLUSION CRITERIA: 31 patients suffering from severe asthma: 1. Patients with diagnosis of asthma requiring regular maintenance medication (that includes high dose inhaled corticosteroid and long‐acting ?2 agonist) 2. High medical resource usage 3. Non‐smoker for at least one year 4. Historical evidence of reversibility