Pediatrics 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 💡 Explanation Which of the following is a feature of Acute severe asthma ✓ Correct Answer: C. Peak expiratory flow rate of < 40 %