On an echo my heart was pumping at 66 but my heart rate was 100 as i was in af. what's the difference and is 66 pumping ok?

Ejection fraction: Your HR of 100 is, of course, the number times your heart pumps blood in 1 minute. That's a bit fast for AF and your doc will likely adjust your medication or cardiovert you. EF is the strength of contraction (the % of blood ejected by your heart in a single beat). 55% is normal. 66% is perfectly normal. (>80% at rest is too high).

Effective beats: The fibrillation above sends continued "messages" to the pump below but only a few of these messages causes the pump to contract and send your blood to the rest of your body. The messages that work is the 66 you mention in your question the total number of messages including that 66 is 100. Sounds like your doctor is doing a great job with your heart!! Hope this helps Dr Z

At risk for stroke: Atrial fibrillation is a risk factor for stroke. You had a PFO that was closed and are still on warfarin for blood thinning and flecainide for rhythm control. Continue to have your INR checked regularly and see your cardiologist in order to decrease your chances of suffering a cardioembolic stroke. http://www.stroke.org/site/PageServer?pagename=afib

HR and EF: Most likely your heart rate was 100 and your ejection fraction ( what percentage of blood volume your heart ejects per beat) is 66%. The later is normal. Your HR is elevated because of the atrial fibrillation. This can be further controlled with medicines if symptomatic. Consider a further discussion of atrial fibrillation and its implications with your cardiologist.