In administering a calcium channel blocker to a patient diagnosed with primary hypertension, the nurse understands this is due to which mechanism of action of this medication?

A. While this information is important for understanding the cause of the asthma exacerbation, it is not the most critical piece of information needed for immediate treatment.
B. Knowing when the symptoms began can help determine the severity of the exacerbation and the need for additional interventions. However, it is not as important as knowing the last dose of medication.
C. This information is crucial for determining the appropriate treatment. If the child has not received their regular medications as prescribed, they may need additional doses to manage the exacerbation.
D. Knowing the child's history of asthma exacerbations is important for assessing the severity of the current episode and planning long-term management. However, it is not the most critical piece of information needed for immediate treatment.

A. Propranolol is a non-selective beta-blocker that can cause bronchoconstriction, making it contraindicated for patients with asthma. It can worsen asthma symptoms by blocking beta-2 adrenergic receptors, which are important for bronchodilation.
B. Theophylline is a bronchodilator that can be used in asthma management, especially in chronic cases. While it has a narrow therapeutic index and can have side effects, it is not contraindicated in acute exacerbations. However, it’s less commonly used today due to better alternatives.
C. Prednisone is a corticosteroid used to reduce inflammation during asthma exacerbations. It is a common and appropriate medication for managing acute asthma attacks, so it does not require clarification.
D. Montelukast is a leukotriene receptor antagonist used for long-term asthma control. It helps reduce inflammation and bronchoconstriction. While it’s not a first-line treatment for acute exacerbations, it is appropriate for ongoing management and doesn’t need clarification.