Impact of sarcopenia and muscle strength on postoperative complication risk following pancreatic resection

Abstract

Background and aims: The association between sarcopenia and postoperative complications has been widely reported in patients with cancer. Yet, the lack of standardized population-specific diagnostic cut-off points and assessments of muscle strength is hampering prospective clinical utilization. Therefore, we aimed to examine the impact of sarcopenia, defined by both regional and international cut-off points, along with various methods of measuring skeletal muscle and muscle strength, on the risk of postoperative complications following pancreatic resection.

Methods: The present prospective observational study enrolled patients scheduled for pancreatic resection. Body composition was assessed by DXA and CT prior to surgery. We applied the algorithm and cut-off points suggested by the European Working Group on Sarcopenia in Older People (EWGSOP) as well as cut-off points from a Danish normative reference population to classify patients as sarcopenic. Physical performance was assessed by usual gait speed while muscle strength was assessed by handgrip strength, leg extensor power, and 30-s sit-to-stand. Postoperative complications within 30 days following surgery were classified according to the Clavien-Dindo classification and the American College of Surgeons National Surgical Quality Improvement Program. Complications graded ≥3 according to Clavien-Dindo were considered major complications.

Results: A total of 134 patients with a mean age of 67 years (SD: 9) were enrolled of whom most underwent pancreaticoduodenectomy (64 %). Using international cut-off points, eight patients (7 %) were classified as sarcopenic using CT scans and sarcopenia was associated with an increased risk of major postoperative complications (RR 2.14 [1.33-3.43]). Using DXA, four patients (3 %) were classified as sarcopenic, all of whom experienced a major complication. With regional cut-off points, 16 patients (13 %) were classified as sarcopenic using CT scans, but sarcopenia was not associated with major complications (RR 1.39 [0.80-2.42]). Nine patients (7 %) were classified as sarcopenic using DXA, but sarcopenia was not associated with major complications (RR 1.15 [0.54-2.48]). Across the different muscle strength assessment methods, handgrip strength consistently demonstrated a stronger association with postoperative complications.

Conclusion: Sarcopenia defined according to the EWGSOP criteria and with international cut-off points is associated with an increased risk of postoperative complications following pancreatic resection. Using regionally based cut-off points, the prevalence of sarcopenia is higher, but it does not confer a higher postoperative complication risk. The use of different muscle strength assessment methods results in vastly different estimates of prevalence of low strength and associations with postoperative outcomes.

Keywords: Cancer; Muscle mass; Muscle strength; Pancreas; Postoperative complications; Sarcopenia.