system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following is a feature of Acute severe asthma
assistant
The correct answer is  Features of Acute Severe Asthma

Heart rate > 120 beats / min
Pa O2 of < 60 mmHg
Peak expiratory flow rate of < 40 %