I am a 31 year old pregnant mother who recently had a AFP test which came back positive for DS. I then was scheduled for genetic counseling, a high resolution ultra-sound scan and met with a wonderful Specialist. The counseling was informative. The ultra-sound revealed I am having a baby girl. The growth of this baby is perfect according to my EDD. Only one soft maker showed up on the scan and it was the cardiogenic focus (bright spot) on the heart. Unfortunately that changed my odds from 1:210 to 1:105. I had previously discussed with my partner that I would most likely have the amnio done if my odds worsened. So it was not too difficult for me to make that decision when it was presented. I have a week and half before I find out the result and promise to post the outcome. I was told however by the specialist that he would be very surprised if this baby wasn't anything but a picture of health at birth.
If you do a search online for cardiogenic foci in down syndrome fetuses, you should be able to come up with some medical opinions. However, I warn you that the opinions vary from research group to research group. Every baby is different and it is my advice to seek your OBGYN or Specialists advice above all else.