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.
Gastricolic reflex: When you eat , you GI tract gets activated in order (mouth to rectum/anus) like a tidal wave. So you may feel like having bowel movement 30-60 min after meal. Your stool is not what you ate , is what was stored in the colon (it takes about 16-24 hrs to digest food before it turns into stool).