what does af stands for in medical terms?
<answer> Atrial fibrillation <context> atrial fibrillation. Abbreviation: AF. The most common cardiac dysrhythmia, affecting as many as 5 – 10% of people age 70 and over. It is marked by rapid, irregular electrical activity in the atria, resulting in ineffective ejection of blood into the ventricles and an irregular ventricular response (apical pulse rate).