NCIt definition : An abnormally rapid heart rate. Thresholds for different age, gender, and patient
populations exist.;
Alternative definition : NCI-GLOSS: Rapid beating of the heart, usually defined as greater than 100 beats per
minute.; NICHD: An abnormally high heart rate for age.; FDA: Abnormally high heart rate. Thresholds for different age, gender, and patient
populations exist.;