Celiac Plexus Block in St. Louis

The celiac plexus is a dense bundle of nerves sitting in front of the aorta in the upper abdomen. Pain signals from the pancreas, liver, gallbladder, stomach and much of the intestine pass through it before traveling to the spinal cord. When those organs are the source of severe, persistent pain, interrupting the plexus reduces the signal reaching the brain. It is a mainstay of treatment for chronic pancreatitis pain.

The patient lies face down and the skin and deeper tissues are numbed. Under fluoroscopic guidance, needles are advanced alongside the vertebral body until the tip sits at the plexus, and contrast confirms correct spread before medication is given. A diagnostic block uses local anesthetic; when that produces good relief, a neurolytic block using alcohol or phenol can extend the duration substantially.

The two clearest indications are pain from chronic pancreatitis and pain from upper abdominal cancers, particularly pancreatic cancer. In both settings the goal is not only comfort but reduced reliance on opioid medication, which carries its own burden of side effects in patients who are often already unwell.

Blood pressure is monitored during and after the procedure, since interrupting these sympathetic nerves can lower it temporarily. Increased bowel activity is common and expected. Most patients go home the same day. The celiac plexus is one of several sympathetic targets we treat, alongside the lumbar sympathetic chain and stellate ganglion.

Pain from the upper abdominal organs does not travel with the vagus nerve. It follows sympathetic afferent fibers that leave the organs, pass through the celiac plexus, run back along the greater, lesser and least splanchnic nerves, and enter the spinal cord between roughly T5 and T12. Because that traffic funnels through one anatomically compact structure lying in front of the aorta at the L1 vertebral level, a single well-placed injection can interrupt sensation from the pancreas, liver, gallbladder, stomach and much of the small bowel at once.

The same anatomy explains the expected side effects. The sympathetic fibers passing through the plexus also maintain vascular tone and restrain gut motility. Interrupting them predictably causes a temporary drop in blood pressure and an increase in bowel activity. These are not complications; they are evidence the block reached its target.

The best-known randomized trial is Wong and colleagues in JAMA in 2004, examining neurolytic celiac plexus block in unresectable pancreatic cancer. Its findings are worth stating honestly rather than selectively: the block moderately reduces pain, but most patients still require opioids, often at a similar dose, and survival is not changed.

That is a real benefit and a limited one. The goal is to lower pain and reduce the escalation of opioid dose, with the side-effect burden that escalation brings, in people who are often already unwell. Anyone who tells you this procedure will let you stop pain medication altogether is overstating what the evidence supports.