2Scroll Compressor History and Development 2OPERATING PRINCIPLES................................ 3Geometry of a Scroll....................................... 3The Scroll Set ................................................. 3Compression Process ...................................... 4Compliance .....................................................
A: Your baby's heartbeat is one of the first things your doctor will look for on an ultrasound, a test that uses sound waves to give off visual images of your baby and placenta as well as your uterus and other pelvic organs.
If the doctor can't detect the heartbeat, he will most likely resort to an ultrasound to confirm that the baby is developing as he or she should. Should the doctor detect the heartbeat on the first try, he will measure the average fetal heart rate by counting how many times the heart beats in a minute.