A 25 year old patient with asthma arrives at the emergency depament complaining of extreme shoness of breath. He has been compliant with his medications, which are metaproterenol and inhaled betamethasone. Over the past 6 hours, his wheezing and shoness of breath have become increasingly severe. At present, his blood pressure is 136/84 mm Hg and with deep inspiration falls to 116/56 mm Hg. His pulse is 126/min, and respirations are 32/min and labored. There is retraction of the sternocleidomastoid muscles with inspiration. There are soft wheezes and poor air movement diffusely throughout both lung fields. His peak expiratory flow rate is 60 L/min, and he is immediately staed on an albuterol nebulizer and given IV hydrocoisone. His aerial blood gas revealed a pH of 7.55, pCO2 of 21 mm Hg, and a pO2 of 60 mm Hg. Twenty minutes later, a repeat peak flow rate is still 60 L/min. A repeat aerial blood gas reveals that his pH is now 7.46, his pCO2 is now 34 mm Hg, and his pO2 is 64 mm Hg. Which of the following is the most appropriate next step in management?

**Core Concept**
The patient is experiencing severe asthma exacerbation, characterized by worsening respiratory symptoms, decreased peak expiratory flow rate, and abnormal arterial blood gas results. The clinical presentation suggests a severe asthma attack, which requires prompt and aggressive management to prevent respiratory failure.

**Why the Correct Answer is Right**
The patient's initial response to albuterol and hydrocortisone is inadequate, as evidenced by the lack of improvement in peak expiratory flow rate and arterial blood gas results. The patient's pH remains alkalotic, and pCO2 is still low, indicating ongoing respiratory alkalosis and possibly impending respiratory failure. The next step in management involves administering corticosteroids via a different route, such as intramuscular or oral steroids, to enhance their absorption and effect. This is because inhaled corticosteroids, like betamethasone, may not be sufficient to manage severe asthma exacerbations.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because administering another dose of albuterol via nebulizer would not address the underlying issue of inadequate corticosteroid absorption or the patient's ongoing respiratory alkalosis.

**Option B:** This option is incorrect because giving oxygen alone would not address the underlying cause of the patient's respiratory failure and would potentially worsen the respiratory alkalosis.

**Option C:** This option is incorrect because administering a bronchodilator like ipratropium bromide would not address the underlying issue of inadequate corticosteroid absorption or the patient's ongoing respiratory alkalosis.

**Clinical Pearl / High-Yield Fact**
In severe asthma exacerbations, corticosteroids should be administered via a different route, such as intramuscular or oral steroids, to enhance their absorption and effect. This is because inhaled corticosteroids may not be sufficient to manage severe asthma exacerbations.

**Correct Answer:** D. Administering corticosteroids via a different route, such as intramuscular or oral steroids, to enhance their absorption and effect.

✓ Correct Answer: D. Prepare for intubation