A 7-year-old child is taken to the emergency depament because he is feeling sho of breath. The episode began about an hour previously while the child was playing spos, when he abruptly developed paroxysms of wheezing and coughing. As the physician enters the room, he notes that the child is sitting leaning forward and is using his accessory respiratory muscles. Physical examination demonstrates tachypnea and tachycardia. On auscultation, a prolonged expiratory phase with relatively high-pitched wheezes through much of the respiratory cycle are heard. No fine crackles are heard. Which of the following medications will have the fastest onset if the 7-year-old child has an acute attack of his condition?
A 7-year-old child is taken to the emergency depament because he is feeling sho of breath. The episode began about an hour previously while the child was playing spos, when he abruptly developed paroxysms of wheezing and coughing. As the physician enters the room, he notes that the child is sitting leaning forward and is using his accessory respiratory muscles. Physical examination demonstrates tachypnea and tachycardia. On auscultation, a prolonged expiratory phase with relatively high-pitched wheezes through much of the respiratory cycle are heard. No fine crackles are heard. Which of the following medications will have the fastest onset if the 7-year-old child has an acute attack of his condition?
💡 Explanation
**Core Concept**
The child's symptoms, such as paroxysms of wheezing and coughing, tachypnea, tachycardia, and prolonged expiratory phase with high-pitched wheezes, are indicative of an acute asthma attack. Asthma is a chronic inflammatory disease characterized by airway hyperresponsiveness, bronchospasm, and mucus production.
**Why the Correct Answer is Right**
In an acute asthma attack, the goal is to rapidly relax bronchial smooth muscles and improve airflow. **Salbutamol (Albuterol)** is a short-acting beta-2 agonist that acts by stimulating beta-2 adrenergic receptors in the bronchial smooth muscle, leading to relaxation and bronchodilation. This results in rapid improvement of airflow and relief of symptoms. The onset of action of salbutamol is approximately 1-2 minutes, making it the preferred medication for acute asthma attacks.
**Why Each Wrong Option is Incorrect**
**Option A:** **Ipratropium bromide** is an anticholinergic bronchodilator that can be used in combination with beta-2 agonists like salbutamol. However, its onset of action is slower, typically 15-30 minutes, making it less suitable for acute attacks.
**Option B:** **Methylprednisolone** is a corticosteroid that is effective in reducing inflammation and airway hyperresponsiveness in asthma. However, its onset of action is much slower, typically several hours, making it less effective for acute symptom relief.
**Option C:** **Montelukast** is a leukotriene receptor antagonist that is used for long-term control of asthma symptoms. It does not have a rapid onset of action and is not suitable for acute asthma attacks.
**Option D:** **Theophylline** is a methylxanthine bronchodilator that can be used in combination with other medications for asthma. However, its onset of action is slow, typically 30-60 minutes, and its use is limited by its narrow therapeutic index and potential side effects.
**Clinical Pearl / High-Yield Fact**
In acute asthma attacks, the use of a spacer device with the inhaler can significantly improve drug delivery and efficacy, especially in children.
**Correct Answer:** . Salbutamol (Albuterol)
✓ Correct Answer: A. Albuterol inhalation
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