Acute Pancreatitis: Acute Pancreatitis: First Days of Treatment

0:00Welcome to Board Pearls. This is episode two of three of the Acute Pancreatitis chapter, in the Pancreatic and Biliary Disease module. This episode covers the first days of treatment. The man from episode one arrives hypovolemic, and his case shows why fluid is urgent, which fluid to give, how much, why more turned out to be worse, how to tell it's working, and what to do when it isn't. His feeding shows how early to start, which tube to use if one is needed, and why parenteral nutrition is the last resort. A woman with mild gallstone pancreatitis then shows why most patients don't need an endoscopic retrograde cholangiopancreatography, ERCP, which patients need one within twenty-four hours and which within seventy-two, why her gallbladder comes out before she goes home, when surgery should wait, and what to do for a patient who can't have surgery at all.

0:50Here's the first patient. He's the sixty-three-year-old man from episode one, with gallstone pancreatitis, systemic inflammatory response syndrome, SIRS, a pleural effusion, a hematocrit of forty-eight, and a rising blood urea nitrogen, BUN. He weighs ninety kilograms. His heart rate is one hundred eight, his blood pressure is low-normal, and he's passed little urine over the last two hours. The night team has written for normal saline at two hundred fifty milliliters an hour.

1:20He's hypovolemic early in predicted severe pancreatitis, and fluid is his most urgent treatment. Third-spacing drains his circulating volume, and as it falls, so does perfusion of the pancreas. Fluid aims to restore that perfusion within a window of about six to twelve hours, before ischemia drives further necrosis, so the first hours count most.

1:41The first decision is which fluid. Lactated Ringer's is preferred over normal saline because it reduces SIRS and C-reactive protein, CRP, at twenty-four hours. Its calcium may help stabilize trypsin, and it avoids the hyperchloremic metabolic acidosis that saline produces, in which the chloride drives renal vasoconstriction and the acidosis worsens splanchnic perfusion. Hydroxyethyl starch isn't recommended, because two trials showed no reduction in mortality and a trend toward more multiple organ failure. His saline is switched to lactated Ringer's.

2:14The second decision is how much, and the night team's rate is too fast. A randomized trial compared aggressive resuscitation, a twenty milliliter per kilogram bolus followed by three milliliters per kilogram per hour, with moderate resuscitation, a ten milliliter per kilogram bolus only in a hypovolemic patient followed by one and a half milliliters per kilogram per hour. Aggressive fluid caused much more fluid overload without reducing progression to moderately severe or severe disease, and the trial was stopped early for safety.

2:48The twenty twenty-four American College of Gastroenterology, ACG, guideline now recommends moderate, goal-directed lactated Ringer's. A hypovolemic patient gets a ten milliliter per kilogram bolus, then one and a half milliliters per kilogram per hour, with hematocrit, BUN, and urine output reassessed at six to twelve hours and a urine goal of half to one milliliter per kilogram per hour. He's hypovolemic, so at ninety kilograms he gets a bolus of nine hundred milliliters, then one hundred thirty-five milliliters an hour, with a urine target of forty-five to ninety milliliters an hour. The night team's two hundred fifty an hour was close to the aggressive rate. A patient with a normal heart rate, blood pressure, urine output, and hematocrit gets no bolus at all, only the maintenance rate.

3:38His fluids are then titrated to dynamic markers rather than run at a fixed rate, and they're reassessed at six to twelve hours, while restored perfusion can still prevent necrosis. A response looks like a falling hematocrit and BUN, urine output at target, and a settling heart rate, and a responder stays at the moderate rate. A non-responder has a hematocrit and BUN that stay high, low urine output, and persistent tachycardia. That patient moves to the intensive care unit, ICU, for closer hemodynamic monitoring rather than getting higher-rate empiric fluid, because once the microcirculation has collapsed, more fluid adds overload without restoring pancreatic perfusion. At eight hours his urine output is thirty milliliters an hour, his hematocrit is forty-seven, and his heart rate is one hundred four, so he goes to the ICU and his rate isn't doubled.

4:30A seventy-four-year-old woman with heart failure and chronic kidney disease shows the other side of fluid dosing. She has gallstone pancreatitis too, but patients with cardiac or renal disease tolerate volume poorly, and for them the risk of overload dominates. Her initial dosing is more conservative than his, and she's reassessed more closely.

4:50The next decision is feeding, and it starts early. The old teaching of pancreatic rest, with nothing by mouth and parenteral nutrition, has been overturned. Enteral nutrition maintains the integrity of the gut mucosa and prevents the bacterial translocation that drives infected necrosis, while parenteral nutrition lets bacteria cross an atrophic gut barrier and doubles the rate of infectious complications.

5:16In mild pancreatitis, early oral feeding within twenty-four to forty-eight hours, as tolerated, shortens the hospital stay and reduces infections compared with delayed feeding. A low-fat solid diet is safe as the first meal and provides more calories than clear liquids, so the old approach of clear liquids first and then advancing is needlessly restrictive. A thirty-four-year-old man with mild pancreatitis who's hungry on day two starts a low-fat solid diet, without clear liquids first and without waiting for his lipase to return to normal.

5:46The man from the first case has predicted severe disease, and that changes his feeding plan less than might be expected. A randomized trial in predicted severe pancreatitis compared early nasojejunal tube feeding within twenty-four hours with on-demand oral feeding starting at seventy-two hours, and found no difference in major infections or death. Early tube placement isn't mandatory, and a patient who can eat should be allowed to advance.

6:12When tube feeding is needed, nasogastric, nasojejunal, and nasoduodenal tubes are equivalent in randomized trials, and polymeric and semi-elemental formulas are equivalent too. So a nasogastric tube with a standard polymeric formula is enough, and feeding doesn't wait while interventional radiology places a nasojejunal tube. If he still can't eat by day four in the ICU, that's what he gets. Parenteral nutrition is reserved for patients who can't tolerate enteral feeding for a prolonged period. It's the failure path, used only when the gut can't be.

6:47The second patient brings the biliary decisions. A forty-one-year-old woman has mild gallstone pancreatitis. Her ultrasound shows gallstones and a common bile duct of normal caliber. Her alanine aminotransferase, ALT, was three hundred on admission and is falling, and her bilirubin was one point eight and is now one point one. She has no fever and a normal white count. On day two her pain is settling and she's eating a low-fat diet. The admitting team has asked for an ERCP to clear the duct.

7:19She has mild gallstone pancreatitis with a falling bilirubin and no cholangitis, and she doesn't need the ERCP. Her case raises three separate decisions: which patient needs an ERCP during the admission, which needs a same-admission cholecystectomy, and which needs neither. Most duct stones have already passed by the time the pancreatitis begins, so an ERCP done only because the cause is gallstones is often empty, while post-ERCP pancreatitis follows in three to fifteen percent. What decides the question is persistent biliary obstruction or cholangitis.

7:51Urgent ERCP within twenty-four hours is for concurrent cholangitis, with fever, jaundice, leukocytosis, and a dilated duct, because antibiotics alone can't sterilize an obstructed biliary tree, and persistent obstruction drives sepsis and organ failure. ERCP within twenty-four to seventy-two hours is for persistent obstruction without cholangitis, meaning a rising bilirubin and ALT with a dilated duct and a visible stone, because a duct left uncleared invites cholangitis and ongoing pancreatitis.

8:26Without either one, ERCP doesn't help, even in predicted severe disease. A randomized trial of urgent ERCP within twenty-four hours against on-demand ERCP, in predicted severe gallstone pancreatitis without cholangitis, found no difference in death or major complications. ERCP treats the bile duct, not the pancreas.

8:48Her normal temperature and white count exclude cholangitis, and her normal duct with a falling bilirubin and ALT shows a stone that has passed, so the ERCP is cancelled. Had she had a fever of thirty-nine with rigors, a bilirubin of four, and a dilated duct, she'd need ERCP within twenty-four hours, and chapter twenty-seven covers the Tokyo criteria for grading cholangitis. Had her bilirubin risen to three point five, with a dilated duct and a stone on magnetic resonance cholangiopancreatography, MRCP, but no fever, she'd need ERCP within twenty-four to seventy-two hours. A bilirubin that plateaus at two with a poorly seen duct calls for MRCP or endoscopic ultrasound, EUS, first, because ultrasound misses many distal duct stones, and that step avoids both an empty ERCP and a missed stone.

9:43What she does need is her gallbladder out. A randomized trial in mild gallstone pancreatitis compared same-admission laparoscopic cholecystectomy, within three days of the pain resolving, with interval surgery at twenty-five to thirty days. Same-admission surgery markedly reduced recurrent biliary events without adding surgical complications, and about one in six of the patients who waited had another biliary event before the planned operation. The stones left in the gallbladder cause recurrent colic, cholecystitis, duct stones, and pancreatitis, and the interval is long enough for a second event.

10:20Same-admission cholecystectomy is now the standard of care for mild gallstone pancreatitis, done once the pain settles and before discharge. That's why every patient with pancreatitis gets an ultrasound at presentation: finding gallstones changes the plan. She has a laparoscopic cholecystectomy on day four and goes home the next day.

10:39Severe disease changes the timing, and the sixty-three-year-old man shows how. He has severe gallstone pancreatitis, with kidney failure lasting beyond forty-eight hours and thirty percent necrosis. In severe or necrotizing pancreatitis, cholecystectomy is deferred for four to eight weeks, until the inflammation settles, because acute peripancreatic inflammation distorts the operative anatomy and the rate of bile duct injury rises sharply in that window. His cholecystectomy is planned for that window, the plan is carried through every handoff so it isn't lost, and he gets an ERCP only if cholangitis or persistent obstruction develops. His necrosis is managed in the meantime, and that's episode three.

11:22The last patient can't have surgery at all. A seventy-nine-year-old man with severe heart failure and chronic lung disease has mild gallstone pancreatitis and is judged unfit for cholecystectomy. For him, ERCP with biliary sphincterotomy substitutes for the operation, because it lowers recurrent biliary events even with the gallbladder left in place, so he has a sphincterotomy before discharge. That's a preventive indication, separate from urgent ERCP for cholangitis. The post-ERCP pancreatitis risk is accepted here because it buys protection he can't get any other way, while for the woman with a passed stone the same risk bought nothing. Chapter twenty-seven covers sphincterotomy as a definitive alternative to surgery.

12:08Here are the traps the boards set in these patients. Normal saline is the wrong first fluid, and hydroxyethyl starch shouldn't be given at all. Aggressive fluid at a fixed high rate causes overload without benefit, and a patient with heart failure or kidney disease shouldn't get the full dose. A non-responder goes to the ICU for monitoring instead of getting a faster rate. A patient with mild pancreatitis shouldn't be kept nothing by mouth or started on clear liquids. Feeding shouldn't wait for a nasojejunal tube when a nasogastric one works as well. And parenteral nutrition has no place while the gut can be used.

12:41The biliary traps are just as predictable. Not every patient with gallstone pancreatitis needs an ERCP, and when obstruction is uncertain, MRCP or EUS comes first. Urgent ERCP doesn't help predicted severe disease without cholangitis, but it can't be delayed when cholangitis is present, and persistent obstruction shouldn't be missed. A patient with mild gallstone pancreatitis shouldn't be sent home to wait four weeks for surgery. The gallbladder shouldn't be removed during acute necrotizing pancreatitis. And the patient who can't have surgery still needs protection, which sphincterotomy provides.

13:17So, start to finish. Give moderate, goal-directed lactated Ringer's: a ten milliliter per kilogram bolus only if the patient is hypovolemic, then one and a half milliliters per kilogram per hour, reassessed at six to twelve hours by urine output, hematocrit, and BUN. Be more cautious with heart or kidney disease, and move a non-responder to the ICU rather than raising the rate.

13:42Feed early. In mild disease, start a low-fat solid diet as soon as it's tolerated. In predicted severe disease, oral feeding on demand is acceptable, a nasogastric tube is enough when one is needed, and parenteral nutrition is only for patients in whom enteral feeding fails, because it doubles infections.

14:03ERCP needs a reason: within twenty-four hours for cholangitis, within twenty-four to seventy-two hours for persistent obstruction, and not at all for gallstone pancreatitis alone, even when it's predicted to be severe. Remove the gallbladder during the same admission in mild disease, defer it four to eight weeks in necrotizing disease, and offer sphincterotomy when surgery isn't possible.

14:24Episode three is necrosis and the other local complications, the vascular complications, post-ERCP pancreatitis, and preventing recurrent attacks.

14:34For the full chapter, the practice vignettes, and the topic-tagged question bank, head to board pearls dot com. You'll find the rest of the series on Apple Podcasts, Spotify, or wherever you listen to podcasts. That brings us to the end of episode two of three of chapter twenty-five, and I'll see you in the next one.