Pancreas Flashcards
Is the pancreas intraparitoneal or retroperitoneal?
Retroperitoneal
The pancreas lies behind what membrane at what level?
Behind the posterior peritoneal membrane at the level of L2
Where is the head of the pancreas?
in the duodenal C loop
Where is the neck of the pancreas?
lies over the superior mesenteric vein
Where is the body of the pancreas?
left of the SMV
Where is the tail of the pancreas?
The tail is the distal-most portion and abuts the splenic hilum
Where is the CBD in relation to the pancreas?
CBD descends in the posterior surface of the pancreatic head
What duct does the CBD join and where?
the main pancreatic duct at the ampulla of Vater
What is the ampulla surrounded by?
The sphincter of Oddi
What is the Duct of Wirsung?
main pancreatic duct
What is the Duct of Santorini?
lesser duct that drains the superior portion of the head through the lesser papilla
What artery supplies the head of the pancreas?
- Celiac trunk to the hepatic artery to the GDA (Gastroduodenal artery) to the superior pancreaticoduodenal artery
- SMA (Superior mesenteric artery) to the inferior pancreaticoduodenal artery
What artery supplies the body and tail of the pancreas?
Celiac trunk to the splenic artery
Where does venous drainage from the pancreas empty?
portal vein
What percentage of the pancreas mass is exocrine?
80-90%
What do acinar cells do?
Secrete enzymes responsible for digestion
Secrete fluid and electrolytes and bicarbonate
What enzymes to acinar cells secrete?
Amylases
Lipases
proteases
What is the function of bicarb?
buffer
What is bicarbonates stimulus and when is it released?
secretin which is released due to low duodenal pH
What do the islets of Langerhans do?
secretes hormones that control glucose homeostasis
What do alpha cells secrete?
Glucagon
What do beta cells secrete?
Insulin and amylin
What do delta cells secrete?
Somatostatin
What do PP or F cells secrete?
Pancreatic polypeptide
What is the pathophys of pancreatitis?
An acute inflammatory process in which pancreatic enzymes autodigest the gland
Pancreatitis is a malfunction of what?
exocrine secretion
What process allows activation of pancreatic enzymes outside the pancreatic ducts and GI tract?
Acinar cell injury
What is the initiating event in acute pancreatitis?
anything that injures the acinar cell and impairs the secretion of zymogen granules, such as alcohol use, gallstones, and certain drugs
What is the overall mortality rate of patients with acute pancreatitis?
10-15%
Does biliary or alcoholic pancreatitis have a higher mortality rate?
Biliary>alcoholic
What percentage of biliary tract disease is caused by alcohol?
85%
What are other causes of pancreatitis?
Post-ERCP Drugs Tumors Trauma Hypertriglyceridemia Developmental abnormalities of the pancreas – pancreas divisum
What is on the ddx for acute pancreatitis?
Acute cholecystitis Ascending cholangitis Perforated peptic ulcer Mesenteric ischemia Esophageal perforation MI
How would acute cholecystitis present?
Gall stones, gallbladder wall thickening, pericholecystic fluid, nl amylase and lipase
How would ascending cholangitis present?
Jaundice, CBD dilation, nl amylase and lipase, Charcot’s triad, Reynold’s pentad
Perforated peptic ulcer
Free air
How would mesenteric ischemia present?
Thickened bowel wall, pneumatosis intestinalis
How would esophageal perforation present?
Air in mediastinum, pnuemothx, pleural effusion, nl amylase and lipase
How does an MI present?
Abnl cardiac nz’s and EKG, nl amylase and lipase
Where is pain located in acute pancreatitis?
Epigastric. May radiate to back, LUQ or RUQ
What are the characteristics of pain in acute pancreatitis?
Dull, boring, and steady. Usually, the pain is sudden in onset and gradually intensifies in severity until reaching a constant ache. Severity varies
What are the associated sx with acute pancreatitis?
N/V. Hematemesis or melena if severe
What are the precipitating factors of pancreatitis?
Large fatty meal if GS pancreatitis. Alcohol ingestion if EtOH pancreatitis
What are the alleviating factors for acute pancreatitis?
Sitting or standing
What is the general survey of acute pancreatitis?
Varies: Uncomfortable to motionless. NAD to toxic (pale, diaphoretic, and listless)
Respiratory distress if severe
Jaundice if GS pancreatitis
What will vitals show for acute pancreatitis?
Normal to fever, tachycardia, hypotension and hypoxic if severe
What will abdominal exam show for acute pancreatitis?
Upper abdominal tenderness with distention +/- guarding and rebound
Severe – Grey Turner’s sign or Cullen’s sign
What is the Grey Turner’s sign?
Bruising of the flank
What is the cullen’s sign
Bruising around umbilicus
What will labs show for acute pancreatitis?
CBC w/diff – leukocytosis with left shift
Amylase elevation ~ 2.5 x normal
Lipase elevation 5 x normal
The level of elevation not related to severity of disease
Elevated bili and alk phos if GS pancreatitis
ABGs if patient is dyspneic
What is part of Ranson’s Criteria on admission?
Age >55 years WBC >16,000/µL Blood glucose level >200 mg/dL Serum LDH level >350 IU/L AST level >250 IU/L
What is part of Ranson’s Criteria during first 48 hrs?
Hematocrit fall >10%
BUN level increase >5 mg/dL
Serum calcium level 4 mEq/L
Fluid sequestration >600 mL
What does a ranson’s score of >/= 3 indicate?
Severe pancreatitis likely
What does a Ranson’s score of <3 indicate?
Severe pancreatitis unlikely
What mortality is associated with a Ranson’s score of 0-2
2%
What mortality is associated with a Ranson’s score of 3-4?
15%
What mortality is associated with a Ranson’s score of 5-6?
40%
What mortality is associated with a Ranson’s score of 7-8?
100%
When should a CRP be drawn for pancreatitis?
24-48 hrs after presentation
What levels of CRP indicates severe pancreatitis?
> 6 mg/dL at 24 hour and > 7 mg/dL at 48 hours strongly indicates severe pancreatitis
What BUN level indicates severe pancreatitis?
Elevated BUN at admission
What is Grade A severity on CT?
Normal pancreas
What is Grade B severity on CT?
Focal or diffuse gland enlargement
What is Grade C severity on CT?
Inflammation of pancreas or peipancreatic fat
What is Grade D severity on CT?
Single ill-defined collection or phlegmon
What is Grade E severity on CT?
Two or more ill-defined collections or the presence of gas in or nearby the pancreas
What would CXR show for acute pancreatitis?
R/O free air. Pleural effusions, hemidiaphragm elevation
What would abd films show for acute pancreatitis?
ileus, sentinel loop, cutoff sign
What would CT show for acute pancreatitis?
pancreatic edema, peripancreatic fluid, necrosis of the gland
What would US show for acute pancreatitis?
gallstones, CBD enlargement
What is the treatment for acute pancreatitis that will spontaneously resolve?
NPO
IVF
Analgesics
No ABX
If gallstone – cholecystectomy when pancreatitis resolves (same admission)
Resolution based on symptoms, not amylase and lipase levels
Feed as pain and tenderness resolve and WBC return to normal
What complications are associates with pancreatitis?
Shock, pulmonary failure, renal failure, GI bleed, MOS failure
When should a patient with acute pancreatitis be admitted to ICU?
CV issues
Respiratory issues
How are CV issues managed with acute pancreatitis?
Monitor CV status Foley catheter Central venous catheter PA catheter Treat with Aggressive fluid resuscitation May need pharmacologic assistance
How is respiratory status monitored?
Pulse ox
ABG
What is impairment of oxygenation caused by with acute pancreatitis?
Sympathetic pleural effusions
ARDs
Fluid overload
How are respiratory issues managed?
O2
May need intubation with aggressive vent settings
How should fluids be managed with acute pancreatitis?
NPO and require aggressive intravenous hydration
Initial several liter fluid bolus followed by 250-500 cc/h continuous infusion
What is the abx protocol for acute pancreatitis?
As prophylaxis against infection in severe acute pancreatitis is not recommended
Should be used in any case of pancreatitis complicated by infected pancreatic necrosis
What GI measures should be taken with a patient with AP?
NGT and antiemetics for nausea and emesis prn
Prophylaxis for gastritis and PUD
What is the nutrition protocol for AP?
Early initiation of enteral nutritional supplementation maintenance of a positive nitrogen balance nasojejunal feeding – past the LOT
TPN second choice
What surgery is indicated when the etiology is gallstones?
Cholecystectomy
What it the protocol for cholecystectomy for mild pancreatitis?
+/- ERCP for sphincterotomy and stone extraction pre-op
Cholecystectomy prior to d/c
What is the protocol for cholecystectomy for severe pancreatitis?
ERCP for sphincterotomy and stone extraction if stone impacted at ampulla of Vater
Cholecystectomy after recovery
What percentage of mortality is associated with infected pancreatic necrosis?
40%
At what point of acute pancreatitis does infected pancreatic necrosis occur?
2-3 weeks
What does worsening organ disfunction signify?
infected pancreatic necrosis