Rapid heart beat my daughter, who is 11 years old, has occasional dramatic increases in her heart rate (once or twice a week). i taught her how to count her beats per minute and today her pulse jumped to 240 for about 5 minutes (per her account). her norm

Your : Your description of her symptoms is very alarming. This is clearly not a normal finding. She needs to see her pediatrician or family physician soon. They may refer her to a pediatric cardiologist. Please don't put this off.

Needs workup: That's definitely abnormal and potentially dangerous. Get her seen, please. She likely has supraventricular tachycardia, but could have a more ominous condition, wolfe-parkinson-white syndrome which is associated with sudden death. That aside, if she has heart rates of 240, she could pass out, fall down, and hurt herself.