A nurse is reinforcing teaching to a school-age child who has asthma. Which of the following medications should the nurse instruct the child to use to abort an ongoing attack?

A) Theophylline:
Theophylline is a bronchodilator medication that is used for the long-term management of asthma, but it is not typically used as the initial treatment for acute asthma exacerbations. Its onset of action is slower compared to short-acting beta agonists like albuterol.

B) Montelukast:
Montelukast is a leukotriene receptor antagonist that is used for the long-term management of asthma, but it is not typically used as the initial treatment for acute asthma exacerbations. Its onset of action is slower compared to short-acting beta agonists like albuterol.

C) Albuterol.
The patient is presenting with symptoms consistent with an asthma exacerbation, including shortness of breath, increased work of breathing, expiratory wheezing, and a history of asthma. Albuterol is a short-acting beta agonist bronchodilator commonly used as the first-line treatment for acute asthma exacerbations. It acts quickly to relax bronchial smooth muscles, relieve bronchoconstriction, and improve airflow, which can help alleviate the patient's symptoms of shortness of breath and wheezing.

D) Salmeterol:
Salmeterol is a long-acting beta agonist bronchodilator that is used for the maintenance treatment of asthma, but it is not typically used as the initial treatment for acute asthma exacerbations. Its onset of action is slower compared to short-acting beta agonists like albuterol, and it is not recommended for rapid relief of acute symptoms.

A) Lowered heart rate:
Dopamine typically increases heart rate as it acts on beta-adrenergic receptors in the heart, leading to increased cardiac contractility and chronotropy. However, at low doses, the effect on heart rate may be minimal compared to higher doses.

B) Decreased conduction through the AV node:
Dopamine may have minimal effects on conduction through the atrioventricular (AV) node, especially at low doses. It primarily acts on adrenergic receptors to increase cardiac contractility and heart rate.

C) Increased urine output.
Dopamine is a medication commonly used to treat shock by improving cardiac output and blood pressure. At low doses, dopamine primarily acts on dopamine receptors in the renal blood vessels, causing vasodilation and increased renal blood flow. This increased renal blood flow leads to increased glomerular filtration rate (GFR) and urine output. Therefore, increased urine output is an expected effect of dopamine infusion at low doses in the treatment of shock.

D) Vasoconstriction of renal blood vessels:
At low doses, dopamine primarily acts on dopamine receptors in the renal blood vessels, causing vasodilation and increased renal blood flow. Vasoconstriction of renal blood vessels is more commonly associated with higher doses of dopamine or with other vasopressor medications such as norepinephrine or phenylephrine.