A 59-year-old male with dizziness and palpitations is assessed. What is the best initial action?

In this scenario involving a 59-year-old male presenting with dizziness and palpitations, the most appropriate initial action is to administer oxygen by nasal cannula.

When a patient exhibits symptoms such as dizziness and palpitations, it may indicate an underlying cardiac issue or another condition affecting oxygenation. Providing supplemental oxygen ensures that the patient receives adequate oxygen levels, which is crucial in any suspected cardiac distress situation. Nasal cannula provides a comfortable means of delivering oxygen, especially if the patient's condition may not yet require more aggressive respiratory support.

Administering oxygen by non-rebreather mask may not be the best initial action because it's typically reserved for more severe respiratory distress or when there's clear evidence of hypoxia that requires a higher concentration of oxygen. Assisting with the administration of nitroglycerin or administering aspirin are interventions that may follow once the initial assessment is completed, especially when a cardiac event is suspected, but they should not replace the foundational step of ensuring the patient has adequate oxygenation. Therefore, starting with the nasal cannula for oxygen support is appropriate for this patient’s initial care.