Pediatrics General 4141f8ee Which of the following is a feature of Acute severe asthma A Heart rate of 110 beats / min B Pa O2 of 70 mmHg C Peak expiratory flow rate of < 40 % D All of the above High-Yield Explanation Features of Acute Severe Asthma Heart rate > 120 beats / min Pa O2 of < 60 mmHg Peak expiratory flow rate of < 40 %