SF 6 is used as a contrast agent for ultrasound imaging. Sulfur hexafluoride microbubbles are administered in solution through injection into a peripheral vein. These microbubbles enhance the visibility of blood vessels to ultrasound.F 6 is used as a contrast agent for ultrasound imaging. Sulfur hexafluoride microbubbles are administered in solution through injection into a peripheral vein. These microbubbles enhance the visibility of blood vessels to ultrasound.
Once constipation (no bowel movement) has gone on for some time, the result can be what is known as an impacted bowel (sometimes called fecal impaction). Essentially, this means that a large lump of dry, hard stool is stuck inside your rectum.
Most people consider several bowel movements a day to at least be unusual, particularly if this pattern is a change from what's normal. However, if nothing else about your bowel movements is different â no loose, watery stools, abdominal cramping or bloody stool â the change is probably not a sign of any illness.ost people consider several bowel movements a day to at least be unusual, particularly if this pattern is a change from what's normal. However, if nothing else about your bowel movements is different â no loose, watery stools, abdominal cramping or bloody stool â the change is probably not a sign of any illness.