Which of the following is a feature of Acute severe asthma
Features of Acute Severe Asthma

Heart rate > 120 beats / min
Pa O2 of < 60 mmHg
Peak expiratory flow rate of < 40 %
Heart rate of 110 beats / min
Pa O2 of 70 mmHg
Peak expiratory flow rate of < 40 %
All of the above