Pylorus-Preserving Pancreaticoduodenectomy for Pancreatic Cancer

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Executive Summary

Pylorus-preserving pancreaticoduodenectomy (PPPD) has emerged as the standard resection procedure for pancreatic head carcinoma and periampullary tumors, provided oncological radicality is not compromised. Numerous randomized controlled trials have refuted early concerns regarding its efficacy compared to the classical Kausch-Whipple operation. The primary clinical advantage of PPPD lies in preserving the stomach and pylorus, thereby reducing the incidence of jejunal ulcers and biliary reflux associated with partial gastrectomy.

The success of the procedure depends on a meticulous three-phase surgical approach: exploration for resectability, radical resection, and complex reconstruction. The most critical technical challenge remains the pancreatic anastomosis, where complications such as fistulas, dehiscence, or necrosis can be life-threatening. While various techniques exist, current clinical evidence suggests that "duct-to-mucosa" pancreaticojejunostomy and pancreatogastrostomy offer comparable outcomes in terms of morbidity and mortality.

1. Clinical Context and Indications

PPPD is indicated for a variety of conditions affecting the pancreatic head and surrounding structures when conservative or interventional approaches fail to relieve biliary or duodenal obstruction.

Primary Indications

  • Ductal Pancreatic Carcinoma: Specifically tumors of the pancreatic head.

  • Chronic Pancreatitis: Symptomatic cases requiring resection.

  • Malignancies: Papillary carcinoma, duodenal cancer, and distal bile duct carcinoma.

  • Precursor Lesions: Intraductal papillary mucinous neoplasm (IPMN).

Comparative Advantages

The procedure follows the technique described by Traverso and Longmire, building on Watson’s initial descriptions. Unlike the classical Whipple procedure—which involves distal gastrectomy—PPPD leaves the stomach unaffected. The duodenum is sectioned 2–3 cm distal to the pylorus. This preservation avoids the negative physiological impacts of removing a portion of the stomach.

2. Surgical Phase I: Exploration and Resectability

The explorative phase determines whether the approach remains curative or must transition to palliative procedures (such as a double bypass or biliodigestive anastomosis).

Key Exploration Steps

  • Laparotomy and Palpation: Systematic examination of the liver, small bowel, and colon to exclude peritoneal carcinosis and distant metastases.

  • Omental Bursa Access: Exposure of the ventral pancreatic surface and dissection of the transverse colon mesentery to exclude infiltration of the stomach or post-pyloric duodenum.

  • Kocher’s Maneuver: Extensive mobilization of the pancreatic head to expose the vena cava, left renal vein, and the entrance of the duodenum at the ligament of Treitz.

  • Vascular Tunneling: Blunt preparation straight on the plane of the superior mesenteric vein (SMV) upwards to the venous confluence.

  • Hepatoduodenal Ligament Identification: Labeling of the hepatic artery, portal vein, and common bile duct. Investigative clamping of the gastroduodenal artery (GDA) is performed to ensure preserved hepatic blood flow before permanent ligation.

Criteria for Resectability: Resectability is confirmed if the pancreas can be completely tunneled in the portal vein's plane and no arterial infiltration is present.

3. Surgical Phase II: Resection

If the tumor is deemed resectable, the gallbladder, duodenum, and pancreatic head are removed.

Resection Procedure

  • Duodenal Sectioning: The post-pyloric duodenum is cut with a linear stapler. The stomach is wrapped in a humid bandage and moved to the left upper abdomen to improve the surgical field.

  • Cholecystectomy and Bile Duct Sectioning: Antegrade dissection of the gallbladder is followed by sectioning the bile duct above the cystic duct junction. Frozen sections are utilized to investigate resection margins.

  • Vascular Management: The GDA is clipped and cut after verifying arterial supply. In cases of localized infiltration into the portal vein or SMV, en bloc resection of the vessel segment with direct end-to-end anastomosis or graft interposition may be performed.

  • Pancreatic Sectioning: The pancreatic body is sectioned over the portal vein using a scalpel. Hemostasis is achieved at the left-sided resection margin, and the pancreatic stump is mobilized by 2–3 cm.

4. Surgical Phase III: Reconstruction

Reconstruction focuses on restoring gastrointestinal continuity using a one-loop technique, typically involving three major anastomoses.

Pancreaticojejunostomy (PJ)

The "duct-to-mucosa" technique is favored for its direct drainage of aggressive pancreatic secretions.

Video:

  1. Laparoscopic Blumgart Pancreaticojejunostomy for the Laparoscopic Whipple Procedure

  2. Pancreaticojejunostomy



Layer

Technical Detail

Preparation

Three 5/0 PDS stitches are placed at both the front and posterior walls of the pancreatic duct.

Direction of the stitches at the posterior wall of the duct is inside-out and at the front wall is outside-in,

Posterior Row

First row (external) uses 5/0 PDS ventral-to-dorsal stitches in the pancreas and seromuscular stitches in the jejunum.

Duct-to-Mucosa

The jejunal lumen is opened (0.8–1 cm). The three initially placed ductal stitches are sutured to the jejunal wall.

Ventral Row

The pancreatic resection margin is completely covered by the bowel serosa to ensure the stump is sequestered.


Biliodigestive Anastomosis (BDA)

Video: Hepaticojejunostomy anastomosis

Performed approximately 8–10 cm distal to the PJ:

  • Uses 5/0 or 6/0 PDS single-stitch sutures.

  • The bile duct is stretched with tethers to facilitate accuracy.

  • The posterior wall is sutured first, with knots placed on the inner surface.

  • The ventral wall is closed with knots on the outside, using corner stitches to ensure an invaginating effect.

Duodenojejunostomy

Performed approximately 40 cm distal to the BDA:

  • An antecolic side-to-side anastomosis is used.

  • The post-pyloric duodenum is joined to the jejunum in two continuous rows.

  • To prevent postoperative gastric emptying disorders, the pylorus is gently spread with a clamp during the procedure.

5. Postoperative Complications and Management

The complex nature of pancreatic surgery necessitates detailed preoperative patient counseling regarding specific risks.

Identified Risks

  • Anastomotic Issues: Leakage or fistulas at the PJ or BDA.

  • Metabolic/Functional Changes: Development of diabetes mellitus or exocrine pancreatic insufficiency.

  • Vascular/General: Arrosion bleeding, thrombosis, or embolism.

Drainage and Stenting

The use of intraluminal drainage or stents to protect the anastomosis is currently debated.

  • Internal Stenting: Some surgeons use small silicone drainage tunneled through the jejunal wall.

  • Current Research: Most randomized studies show no statistically significant advantage for routine stenting, except in specific cases of soft pancreatic tissue or small ducts.

  • Routine Practice: Two easy-flow drainages are typically placed near the PJ and BDA sites. Patients are generally monitored in a post-anesthesia care unit for 12–24 hours post-surgery.