Which treatment is appropriate for Sinus tachycardia?

For managing sinus tachycardia, administering oxygen is an appropriate treatment because it addresses potential underlying causes such as hypoxemia. Sinus tachycardia can result from various factors, including anxiety, fever, pain, dehydration, or reduced oxygen delivery to tissues. Providing supplemental oxygen can help to alleviate symptoms and improve oxygen saturation, particularly in cases where the tachycardia is secondary to respiratory or circulatory issues.

Atropine is generally used to treat bradycardia, not tachycardia, thus it would not be indicated in this scenario. Cardioverting is a procedure aimed at restoring a normal heart rhythm, typically utilized for more serious arrhythmias where the heart is not functioning correctly or if the patient is unstable. Defibrillation is indicated for life-threatening arrhythmias such as ventricular fibrillation or pulseless ventricular tachycardia, but is contraindicated for sinus tachycardia, as this is not a shockable rhythm.