Whipple Procedure (Pancreaticoduodenectomy) - Full Details

Overview

• Classic Whipple: includes distal gastrectomy (antrectomy)
• Pylorus-preserving pancreaticoduodenectomy (PPPD): preserves the entire stomach and pylorus with division of the duodenum 2 cm distal to the pylorus

A: Tissue resected (shaded blue) including tumor, gallbladder, distal bile duct, duodenum, pancreatic head; B: Classic reconstruction with gastrojejunostomy, choledochojejunostomy, pancreaticojejunostomy; C: Pylorus-preserving reconstruction with duodenojejunostomy instead of gastrojejunostomy.

Indications

• Adenocarcinoma of the pancreatic head (most common)
• Periampullary tumors (ampullary carcinoma, distal cholangiocarcinoma, duodenal carcinoma)
• Cystic neoplasms of the pancreatic head (IPMN, mucinous cystic neoplasm)
• Neuroendocrine tumors of the pancreatic head
• Chronic pancreatitis (head-dominant disease refractory to other measures)
• Benign disease: ampullary adenoma, duodenal polyposis

Preoperative Assessment

• Staging CT (arterial and venous phase): evaluates for distant metastases and local vascular involvement
  • Involvement of SMA/celiac/hepatic artery = unresectable
  • SMV/portal vein involvement can be addressed with vascular resection and reconstruction in select cases
  • Look for "bird's beak" or teardrop deformity of the SMV indicating venous involvement
• CA 19-9, bilirubin, LFTs, nutritional status
• Biliary drainage: endoscopic stenting for obstructive jaundice before surgery in selected cases
• Neoadjuvant therapy: increasingly used for borderline-resectable disease; operations after neoadjuvant therapy are more complex due to fibrosis/adhesions

Patient Preparation & Positioning

• General endotracheal anesthesia
• Supine position with arms extended
• Nasogastric tube, Foley catheter
• Preoperative broad-spectrum antibiotics (gram-negative and anaerobic coverage)
• VTE prophylaxis

Incision

• Upper midline laparotomy (most common) - from xiphoid to umbilicus
• Bilateral subcostal (chevron) incision - for broader exposure in obese patients

Diagnostic Laparoscopy (Before Laparotomy)

• Recommended before the main incision: ~10% of patients will have small-volume metastatic disease (liver surface, peritoneum) not detected on preoperative imaging
• If metastases are found, proceed to palliation rather than resection
• Inspect all visceral and parietal peritoneal surfaces and the liver

RESECTION PHASE: Six Operative Steps

Step 1 - Define the Infrapancreatic Superior Mesenteric Vein (SMV)

• Elevate the greater omentum from the transverse colon
• Mobilize the hepatic flexure of the colon to the level of the duodenum
• Enter the lesser sac
• Incise the visceral peritoneum along the inferior border of the pancreas (medial to lateral) to expose the infrapancreatic SMV
• Identify the junction of the middle colic vein and SMV (may enter directly or share a common trunk with the gastroepiploic vein - the gastrocolic trunk)
  • If shared trunk: either preserve the trunk (dividing only the gastroepiploic vein) or divide the entire trunk
• Purpose: confirm the SMV is free from tumor before committing to resection; establish the lower boundary of the pancreatic tunnel
• Note: If inflammatory scarring prevents early SMV identification, the vein will be exposed in Step 6 after pancreatic neck division

Step 2 - Extended Kocher Maneuver (Mobilize Duodenum and Pancreatic Head)

• Begin the Kocher maneuver at the third (transverse) portion of the duodenum by identifying the inferior vena cava
• Mobilize the duodenum and pancreatic head medially to the level of the left renal vein
• Divide the posterior leaf of peritoneum behind the mesenteric vessels
• Rotating the head of pancreas medially exposes the posterior aspect and facilitates subsequent SMA dissection
• Purpose: Allows palpation of the SMA to assess if a tumor-free plane exists between mass and artery; confirms resectability

Step 3 - Portal Dissection and Cholecystectomy

• Identify the common hepatic artery
• Remove the hepatic artery lymph node to improve visualization
• Perform retrograde cholecystectomy (top-down), freeing the gallbladder from its bed
• Transect the common hepatic duct at the level of the cystic duct junction; send bile duct margin for frozen section
  • CRITICAL: Before division, confirm no replaced/accessory right hepatic artery (arises from SMA, courses posterolateral to PV - present in ~15-20% of patients and easily injured)
• Place a bulldog clamp on the hepatic duct stump to prevent bile spillage; send biliary cultures
• Division of the common hepatic duct exposes the anterior surface of the portal vein
• Identify the gastroduodenal artery (GDA) - confirm proper hepatic artery pulsation before ligation
• Divide the GDA: exposes the superior border of the pancreas and the portal vein
• The superior pancreaticoduodenal vein (Pancreas Belcher vein) is a constant tributary at the superolateral aspect of the PV - handle with care to avoid traction hemorrhage

Step 3: Top-down cholecystectomy to identify the cystic duct-common hepatic duct junction. Division of the common hepatic duct above the cystic duct.

Step 4 - Transect the Stomach or Duodenum

• Transect the stomach with a GI stapler at the level of the 3rd/4th transverse vein on the lesser curvature and at the confluence of the gastroepiploic veins on the greater curvature
• This completes a standard ~30-40% distal gastrectomy (antrectomy)
• Note: When opening the pars flaccida (hepatogastric ligament), specifically look for and preserve any accessory or replaced left hepatic artery arising from the left gastric artery

• Divide the duodenum approximately 2 cm distal to the pylorus to preserve adequate blood supply to the duodenojejunostomy
• Pylorus preservation is appropriate for small periampullary neoplasms; avoid in bulky pancreatic head tumors or duodenal tumors involving the 1st/2nd portion
• In patients who received preoperative radiation: antrectomy is recommended as the antrum lies within the radiation field

Step 5 - Divide the Jejunum and Mobilize the Ligament of Treitz

• Carefully take down the ligament of Treitz (loose attachments) - avoid injury to the inferior mesenteric vein (IMV)
• Transect the jejunum ~10-15 cm distal to the ligament of Treitz with a GI stapler
• Divide the mesentery to the level of the 3rd and 4th portions of the duodenum
• Reflect the devascularized duodenum/jejunum segment under the superior mesenteric vessels to the right side of the abdomen - this exposes the uncinate process for the final dissection

Step 5: Transection of the jejunum followed by mesentery division. The duodenum and jejunum are reflected under the mesenteric vessels to the right abdomen.

Step 6 - Remove the Pancreatic Head from the SMV/PV and SMA

• Confirm the SMV-portal vein tunnel is patent (finger or blunt clamp passed posterior to pancreatic neck, anterior to PV/SMV)
• Place hemostatic sutures along superior and inferior borders of the planned transection line
• Transect the pancreatic neck with electrocautery at the level of the portal vein
  • The pancreatic neck margin is sent for frozen section
• Pass vessel loops around the distal SMV, PV, and splenic vein for vascular control
• Retract the SMV-PV confluence medially to expose the SMA posteriorly
• Separate the pancreatic head and uncinate process from the SMA (the "SMA dissection" or "uncinate dissection"):
  • Ligate and divide all branches from the uncinate/pancreatic head into the right lateral aspect of the PV/SMV: superior and inferior pancreaticoduodenal veins, right gastroepiploic vein, and any anomalous branches
  • Ligate inferior pancreaticoduodenal arteries directly off the SMA - failure to control these results in post-resection hemorrhage
  • Clear all tissue along the right lateral border of the SMA (the "retroperitoneal margin" or "SMA margin" - most common positive margin in pancreatic cancer)
• The specimen (pancreatic head, duodenum, gallbladder, bile duct, with or without gastric antrum) is now removed en bloc

RECONSTRUCTION PHASE: Three Anastomoses

1. Pancreaticojejunostomy (PJ) - most proximal anastomosis

• The most technically demanding anastomosis and the primary source of morbidity (pancreatic fistula)
• Three main techniques:
  • End-to-end (terminoterminal) dunking: the pancreatic stump is invaginated (dunked) into the end of the jejunum
  • End-to-side (terminolateral) dunking: pancreas invaginated into a side opening in the jejunum
  • Mucosa-to-mucosa (duct-to-mucosa) pancreaticojejunostomy: the pancreatic duct is anastomosed directly to a corresponding enterotomy in the jejunum - preferred when the pancreatic duct is dilated (>3 mm)
• A pancreatic duct stent (internal or external) is often placed across the anastomosis
• Risk factors for pancreatic fistula: soft gland texture, small duct diameter (<3 mm), non-pancreatic cancer pathology, high intraoperative blood loss (these four factors constitute the Fistula Risk Score, FRS)

2. Hepaticojejunostomy (HJ) - biliary anastomosis

• Performed approximately 10 cm distal to the PJ
• End-to-side, single-layer technique with absorbable monofilament sutures
• A biliary stent may be placed if the bile duct is narrow
• The round ligament (preserved at the start of the case) is used as a pedicled flap to cover the GDA stump and serve as a physical barrier

3. Gastrojejunostomy (classic) or Duodenojejunostomy (pylorus-preserving)

• Performed approximately 50-60 cm distal to the HJ (antecolic or retrocolic position)
• Classic: side-to-side or end-to-side gastrojejunostomy (isoperistaltic, partial orallis partialis orientation)
• PPPD: end-to-side or end-to-end duodenojejunostomy ~2 cm distal to the pylorus

Variant: Pylorus-Preserving Whipple (PPPD)

• The entire stomach is preserved
• Duodenum is divided 2 cm from the pylorus
• Reconstruction uses a duodenojejunostomy rather than gastrojejunostomy
• Advantages: avoids dumping syndrome, better nutritional outcomes, equivalent oncologic results
• Disadvantage: higher rates of delayed gastric emptying (DGE) compared to classic

Vascular Resection and Reconstruction

• Tangential resection with primary suture repair (for partial involvement)
• Segmental resection with end-to-end anastomosis or interposition graft (saphenous vein, internal jugular vein) for circumferential involvement
• Arterial resection (SMA, hepatic artery) is controversial and performed at specialized centers only
• Pre-op CT signs: bird-beak deformity, teardrop deformity of the SMV indicate likely need for vascular reconstruction

Procedure-Specific Complications

Outcomes

• Operative mortality: <3% at high-volume centers (>20 PD/year), up to 15% at low-volume centers
• 5-year survival: pancreatic adenocarcinoma ~25-30% with R0 resection (adjuvant chemotherapy with modified FOLFIRINOX or gemcitabine/capecitabine); ampullary/distal bile duct tumors ~40-60%
• Margin status (R0 vs R1): the SMA/retroperitoneal margin is most commonly positive; R0 resection is the primary determinant of long-term survival
• Extended lymphadenectomy: four randomized trials have failed to demonstrate survival benefit and show increased morbidity (higher DGE and fistula rates)

• Current Surgical Therapy, 14e - Pancreaticoduodenectomy chapter (Cameron et al., with Sandone illustrations)
• Mulholland and Greenfield's Surgery, 7e, p. 2697-2700
• Fischer's Mastery of Surgery, 8e, Chapter on Pancreaticoduodenectomy
• Maingot's Abdominal Operations - Pancreaticoduodenectomy Technique
• Clinical Gastrointestinal Endoscopy, 3e - Whipple Procedure (endoscopic anatomy)