The correct answers are: IV adenosine, IV beta blockers, IV amiodarone, or IV calcium channel blockers. Supraventricular tachycardia is a kind of abnormal heart rate and the pathology lies in the atria (hence supraventricular). This is seen in the ECG as narrow QRS complexes. While all the management is applicable for supraventricular tachycardia, the first line is IV adenosine to normalize the heart rate. If this doesn't work, then IV amiodarone can be the second line. After these interventions are done but with no avail, cardioversion should be done.