by Gail Belsky. The term sleep disorder may suggest someone tossing and turning all night, but lying awake for hours with insomnia is just one example of many conditions that affect how you sleep and function during the day. In fact, you can have a sleep disorder and not even know it. Next: How long to snooze.
A U wave as seen on ECG. An electrocardiogram of an 18-year-old man showing U waves, most evident in lead V3. The U wave is a wave on an electrocardiogram that is not always seen. It is typically small, and, by definition, follows the T wave. U waves are thought to represent repolarization of the papillary muscles or Purkinje fibers.
ug means the same as mcg. posted by Alastair: Hi Sharon, ug and mcg are both symbols for 'micrograms'. The correct symbol for microgram is actually Âµg. However, there is no way of typing that on a keyboard, so they came up with other versions, two of which are ug and mcg. If you wish to convert micrograms (ug or mcg) to milligrams, you can use this converter: