Rhythm Puzzles

These Rhythm Puzzles have been published in the Netherlands Heart Journal and are reproduced here with permission from the publisher, Bohn Stafleu Van Loghum.

1. A fainting lady with some extrasystoles
2. One to one, one to two, two to one? What is the rhythm?
3. Syncopated rhythm
4. Out of the frying pan and into the fire
5. An irregular rhythm at older age
6. I think a niece of mine was referred to a neurologist
7. Just one Collaps During Soccer
8. Tachycardia terminated by adenosine
9. Nightly phenomena, day time work?
10. ECG puzzle: Appearances can be deceiving
11. Where do the extras come from?
12. 'The turtle and the hare'