In this activity, students will learn about theme and variation as a compositional form and put their own spin on a familiar melody through group improvisation. "Theme and variation" is a popular ...

Note in lead V5 rhythm strip how the amplitude of the QRS complexes vary, however not beat to beat as would be seen in electrical alternans. This variation can occur with the respiratory cycle as ...

"If you notice an unusually high, low or irregular rhythm, don't worry—there are many possible causes for these variations, not all of which are linked to serious heart conditions. However ...