Supraventricular tachycardia (SVT) is an abnormally fast heart rhythm arising from improper electrical activity in the upper part of the heart. SVT is commonly treated with adenosine using three different IV administration techniques. However, it is not well known which of these three techniques is the quickest or most likely to reach the heart in order to stop SVT. This study will simulate each of those techniques in an investigator-blinded procedure. Intravenous agitated saline, used as a surrogate for a dose of adenosine, will be administered to healthy volunteers using all three techniques and monitored using bedside ultrasound to observe their efficacy and speed in reaching the right side of the heart.

Inclusion Criteria:

• Volunteers aged 18 years and older
• Able to understand and provide signed consent for the study
• Must be healthy; not being actively treated for any condition that requires active medical intervention or monitoring to avert serious danger to the participant's health or well-being, as evaluated by study investigator

Exclusion Criteria:

• Non-English speaker
• Those with contraindications to peripheral IV placement, such as infection or other contraindication noted from evaluation by study investigator
• Pregnancy

The investigator performing the ultrasound and the person timing the simulation were both blind to the method used for each push. An unblended investigator performed the pushes but did not assess the outcomes.