A 30-year-old woman with known asthma presents with severe breathlessness. She is unable to complete sentences, respiratory rate 34/min, heart rate 130/min, PEFR 20% predicted and silent chest on auscultation. What is the most appropriate next step?ATreat as mild asthma with inhaled Salbutamol onlyBGive high-dose inhaled steroid and dischargeCRecognise life-threatening asthma, call for immediate senior and anaesthetic help and start high-flow oxygen, nebulised bronchodilators and IV accessDGive oral antibiotics for presumed chest infectionEArrange routine outpatient reviewCheck my answer