What is atrial fibrillation with controlled ventricular response?

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Tags

1. #correctly
2. #contracting
3. #response
4. #enough
5. #ventricles
6. #instead
7. #blood
8. #signals
9. #ventricular
10. #heart
11. #atria
12. #beats
13. #these
14. #lungs
15. #rapid
16. #quiver