Final answer:
Oxygen and bronchodilators are the most appropriate initial treatment for a patient with multifocal atrial tachycardia (MAT). The correct answer is option c).
Step-by-step explanation:
The most appropriate initial treatment for a patient with multifocal atrial tachycardia (MAT) would be oxygen and bronchodilators. MAT is often associated with conditions that cause pulmonary stress and may reflect underlying problems such as chronic obstructive pulmonary disease (COPD).
Hence, providing oxygen and bronchodilators can help alleviate these pulmonary issues and reduce the tachycardia. This approach can be more beneficial and safer as a first-line intervention compared to aggressive methods like electrical cardioversion.
It may be reserved for hemodynamically unstable patients or those in whom initial conservative treatments have failed. Intravenous adenosine is typically used for regular narrow-complex tachycardias and amiodarone is generally utilized for ventricular arrhythmias or when other rhythm-control strategies are contraindicated or ineffective.