Persistent Hypotension After Neurolytic Coeliac Plexus Blockade in a Cachectic Cancer Patient: A Case Report

The Body's Brake System and the "Perfect Storm"

Imagine your body is a high-performance car cruising down a highway. To keep the speed steady, the car has a sophisticated braking system that can gently slow down the engine or the wheels when needed. In the human body, this "braking" and "speeding up" is managed by the autonomic nervous system, a hidden network of wires that controls things you don't think about, like your heart rate and blood pressure. Sometimes, when a person has severe pain from cancer in their belly, doctors use a special "chemical wrench" called a neurolytic coeliac plexus block. This procedure involves injecting alcohol to permanently destroy a specific cluster of nerves (the coeliac plexus) that carries pain signals from the organs. Think of it as cutting the wires to a noisy alarm clock so the patient can finally sleep.

Usually, this works like a charm, but there's a catch. Because those same nerves also help keep blood pressure up by tightening blood vessels, turning them off can sometimes cause the blood vessels to relax too much, like a garden hose that's been turned loose. This leads to a drop in blood pressure, known as hypotension. Most of the time, this is a short-lived hiccup that fixes itself with a little fluid. However, in very sick patients who are already running on empty—what doctors call "cachexia," a state of severe weight loss and muscle wasting—the body might not have enough fuel or reserves to bounce back. This paper explores a rare but serious situation where the "brakes" were cut, and the car just wouldn't speed up again, turning a routine procedure into a major medical challenge.

The Case of the 12-Day Low

This story comes from a 68-year-old woman with advanced gallbladder cancer that had spread to her liver and other parts of her body. She was in a state of severe cachexia, meaning her body had lost a significant amount of weight and muscle; her body mass index was a very low 16.5 kg/m². She was suffering from terrible stomach pain that didn't respond well to standard painkillers. To help her, doctors performed a bilateral coeliac plexus alcohol neurolysis. They used a camera to guide a needle to the L1 level of her spine and injected 10 mL of a numbing medicine followed by 10 mL of pure alcohol. This created a mixture with about 50% alcohol concentration right where the nerves were.

The procedure worked to stop the pain, but it triggered a problem. While she had a brief drop in blood pressure during the surgery that was fixed with fluids and a drug called phenylephrine, the trouble started the next day. Despite receiving a massive 3 liters of fluids (both colloid and crystalloid), her blood pressure stayed dangerously low. She became so unstable that she needed a continuous drip of dopamine, a powerful drug that forces the heart to pump harder, at a rate of up to 19 µg/kg/min. This lasted for 12 days. The only other symptom she had was feeling dizzy when she stood up; she was fully awake, had no weakness in her limbs, and felt no pain.

Ruling Out the Usual Suspects

Before panic set in, the medical team had to play detective to figure out why her blood pressure wouldn't come back up. They looked at the list of common reasons for shock (when blood pressure drops too low to support the body). They checked for bleeding, infection, heart attacks, or blockages in the lungs. They ran blood tests and found her kidneys and thyroid were working fine, and her infection markers were normal. They also ruled out the scary complications that can happen with this specific needle procedure, like a tear in a major blood vessel, a puncture in the spinal cord, or an infection in the spine. Since she had no back pain, no fever, and no loss of feeling in her legs, the scary "what-ifs" were unlikely.

The team realized that her body was in a "perfect storm." The alcohol injection had destroyed the nerves that usually tighten blood vessels (a process called sympathectomy), causing them to stay wide open. Normally, the body would compensate, but this patient was already running on fumes. She had been losing weight rapidly, eating almost nothing (just two spoonfuls of food and 150 mL of water a day), and had been having diarrhea for two months before she even came to the hospital. Her body was so depleted of fluid and energy that it couldn't fight back against the low blood pressure.

The Solution: A Hormone and a Meal Plan

The doctors decided to try a different approach. Instead of just pushing more fluids or stronger heart drugs, they introduced a medication called fludrocortisone. This is a steroid that acts like a sponge for the kidneys, telling them to hold onto salt and water instead of peeing it out. This helps expand the volume of blood in the vessels. They gave her 0.1 mg of fludrocortisone daily for one week.

At the same time, they brought in a dietitian to create a high-energy meal plan to help her body recover its strength. Slowly, the dopamine drip was turned down and stopped completely on day 12. Her diarrhea stopped on its own, and her blood pressure finally stabilized. She was able to leave the hospital and go to a recovery unit on day 21.

What This Means

This paper suggests that while neurolytic coeliac plexus blocks are great for pain, they can cause a rare, long-lasting drop in blood pressure in patients who are already very weak and malnourished. The authors propose that the combination of the procedure destroying the blood vessel "brakes" and the patient's lack of nutritional reserve created a situation where the body couldn't recover on its own. They found that adding fludrocortisone and fixing the nutrition helped solve the problem much faster than just using fluids and heart drugs.

The authors admit that their explanation is a bit of a guess because they couldn't run every possible test (like a full autonomic function test) on such a sick patient. However, they believe that for future patients with advanced cancer and severe weight loss, doctors should check their autonomic health and nutrition before the procedure. If a patient is at high risk, starting fludrocortisone early might prevent them from being stuck on life-support drugs for weeks. It's a reminder that in palliative care, even a small procedure needs a big safety net when the patient is running on empty.