I'm interested to see that your cardiologist advised that there could be a potential connection. But would you be able to elaborate on your second sentence? Were you saying that your cardiologist said that if you had the booster, they did not think the flutter occurrence would happen again? I spoke to my PCP about my situation and she thought it might be wise to wait and gather more information. My understanding about the booster is that it is half as strong as the 1st and second doses we received previously.