That's the answer to your description's question: before or on the 51st ball drawn. But since your heading asks a slightly different question, I'll also answer your heading's question, which is just before 51 balls.
Looking for the definition of AFIS? Find out what is the full meaning of AFIS on Abbreviations.com! 'Automated Fingerprint Identification System' is one option -- get in to view more @ The Web's largest and most authoritative acronyms and abbreviations resource.
What is atrial Fibrillation (AFib, AF). Patient Comments Read 2 Comments Share Your Story. Atrial fibrillation (also referred to as AFib, Afib, A-fib. Normal heart contractions begin as an electrical impulse in the right atrium. This impulse comes from an area of the atrium called the sinoatrial (SA) or sinus node, the natural pacemaker that causes the normal range of regular heartbeats.