ABSTRACT
Adenosine stress myocardial perfusion imaging was performed with an intravenous adenosine and radiopharmaceutical injection in the same line. A syringe containing 720 µg/kg of adenosine in 40 ml of saline was prepared and injected at the constant infusion rate of 400 ml/h. Adenosine was temporarily stopped by the stopcock when 1.5 ml of thallium was injected for 0.5 second from the three-way stopcock with two ways opened. Thereafter, the stopcock was returned to the original position in 0.5 second, and adenosine flow returned to the constant flow rate again. In this method, 0.75% of adenosine total dose was injected at a rate of 3.0 ml/s and adenosine was stopped for 3.6 second. There were no significant differences in either effects and adverse events of adenosine between this method and two intravenous injection line method. Adenosine stress in one venous line method would be an easy method maintaining the dose effect and safety.