It only helped me with a push (iv syringe straight into my vein), instead a drip which is diluted into a bag of saline or piggy backed with a small bag of Cardizem.
Everyone is different but perhaps ask for a slow push within 8 minutes. A RN disagreed that it would work so I asked him to let me bet on it. He high 5 me when it worked and I had him as my advocate afterwards whenever I went to the ER.
Ask your EP to write a letter for the ER to have on hand.