I have mitral valve prolapse. I was sitting at my desk at work not doing anything and I felt like my heart stopped or skipped several times. then it went into this very fast heart rate..i mean like I have never felt before. It then sent me into a panic that I took an extra atenolol (I usually take 25 mg a day). I had my mom take me to the emegency room. I was standing up didnt really feel like I was going to pass out or anything but thought I would get it checked out. I have skips all the time but this very fast heart rate I have not had since I have been on the atenolol. When I got to the hospital heart rate was 117....it had slowed down some....oxygen rate was 100....my BP was a lil high 139/74. They did a chest x-ray, ekg, monitored my heart for a while, did blood work and everything checked out fine....normal sinus rhythm the whole time i was there except one skip. What scares me is if this will happen again and what was it Ventricular Tachycardia or SVT...how do I know if it was just a normal sinus fast heart rate or something worse. I wish now I would have taken the pills and they could have caught it...please help I am sitting here at home scared to go anywhere for fear it will happen again...scared to be home alone with my son for fear something will happen.