Radical antegrade modular pancreatosplenectomy (RAMPS): does adrenalectomy alter outcomes?

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Executive Summary

This briefing document analyzes the perioperative outcomes of Radical Antegrade Modular Pancreatosplenectomy (RAMPS) compared to standard distal pancreatectomy (DP) for patients with pancreatic ductal adenocarcinoma (PDAC). While RAMPS—specifically the posterior approach involving adrenalectomy—is intended to provide superior oncologic resection by achieving negative margins in advanced tumors, it is associated with significantly higher perioperative risks.

Analysis of the American College of Surgeons (ACS) National Surgical Quality Improvement Program (NSQIP) database indicates that posterior RAMPS patients face a 45% higher likelihood of serious morbidity and a 39% lower likelihood of achieving "Optimal Pancreatic Surgery" (OPS) compared to those undergoing standard DP. These findings suggest that the potential for improved long-term oncologic outcomes must be carefully weighed against increased short-term surgical risks.

Overview of Surgical Approaches

The surgical management of pancreatic body and tail tumors has evolved from standard distal pancreatectomy to more extensive modular approaches designed to improve margin status.

  • Standard Distal Pancreatectomy (DP): The conventional approach for resecting tumors of the pancreatic body and tail.

  • RAMPS (Radical Antegrade Modular Pancreatosplenectomy): Described by Strasberg et al. in 2013, this technique involves a more extensive posterior dissection than standard DP.

    • Anterior RAMPS: Dissection occurs anterior to the renal fascia.

    • Posterior RAMPS: Dissection occurs posterior to the renal fascia and includes the en bloc resection of the left adrenal gland and Gerota’s fascia. This is typically employed when periadrenal invasion is suspected.

Study Methodology and Patient Characteristics

The source analysis utilized the ACS NSQIP Procedure-Targeted Pancreatectomy database (2014–2019), identifying 3,467 PDAC patients.

  • Cohort Distribution: 3,308 (96.4%) underwent standard DP, while 159 (4.6%) underwent posterior RAMPS (defined as DP with concomitant adrenalectomy).

  • Pathology: Patients in the RAMPS group presented with more advanced disease. T3-T4 stages were present in 77% of RAMPS patients compared to 58% in the DP group (p < 0.01).

  • Demographics: RAMPS patients were generally older, had higher BMIs, and were less likely to be Caucasian.

  • Surgical Approach: 95.6% of RAMPS procedures were performed via an open approach, compared to 68.8% for standard DP.

Comparative Perioperative Outcomes

The addition of an adrenalectomy in posterior RAMPS significantly alters the perioperative profile of the procedure.

Clinical and Statistical Morbidity

On multivariable analysis, several outcomes were significantly worse for the posterior RAMPS cohort:

Optimal Pancreatic Surgery (OPS)

OPS is a composite outcome defined as the absence of death, serious morbidity, percutaneous drainage, or reoperation, combined with a length of stay ≤75th percentile and no readmission.

  • Standard DP: 57.2% achieved OPS.

  • Posterior RAMPS: 40.3% achieved OPS.

  • Significance: Posterior RAMPS patients were 39% less likely to achieve an optimal surgical outcome (OR 0.61, p = 0.004).

Analysis of Complicating Factors

1. Advanced Disease and Staging

The higher morbidity in the RAMPS group is partially attributable to the advanced nature of the tumors being treated. The significant prevalence of T3 and T4 stage tumors (66.0% and 10.9% respectively in the RAMPS group) necessitates a more invasive procedure involving the removal of additional organs and extensive retroperitoneal dissection.

2. Blood Transfusions

Posterior RAMPS patients required significantly more perioperative transfusions (32.1% vs. 13.9%). The document notes that blood transfusions are known to impact survival outcomes through the alteration of the immune response and have been associated with worse survival in PDAC patients.

3. Surgical Technique and Access

The majority of RAMPS procedures were performed using an open technique (95.6%), whereas over 25% of standard distal pancreatectomies utilized minimally invasive (laparoscopic or robotic) methods. Minimally invasive approaches are generally associated with reduced blood loss and shorter hospitalizations.

4. Non-Significant Outcomes

Despite the increase in serious morbidity, the study found no statistically significant difference between standard DP and posterior RAMPS in the following areas:

  • 30-Day Mortality: 1.9% (RAMPS) vs. 1.1% (DP).

  • Clinically Relevant Postoperative Pancreatic Fistula (CR-POPF): 18.2% (RAMPS) vs. 14.7% (DP).

  • Reoperation Rates: 2.5% (RAMPS) vs. 3.8% (DP).

  • Readmission Rates: 22.0% (RAMPS) vs. 16.2% (DP).

Conclusion

The data confirms that Radical Antegrade Modular Pancreatosplenectomy with adrenalectomy (posterior RAMPS) carries a higher risk of perioperative complications—specifically organ space infections, venous thromboembolism, and the need for transfusions—compared to standard distal pancreatectomy. While RAMPS is designed to achieve superior oncologic margins in patients with advanced PDAC, surgeons must weigh these potential long-term benefits against the immediate increased risk of surgical morbidity and the decreased likelihood of an "optimal" perioperative course.