Safety and Effectiveness of SAF-R, a Novel Patient Positioning Device for Robot-Assisted Pelvic Surgery in Trendelenburg Position

Upper extremity contact pressure measurement in robot-assisted pelvic surgery

Upper extremity complications are often a problem in robot-assisted pelvic surgery (RAPS) with the lithotomy-Trendelenburg position (LT-position). This study focused on upper extremity contact pressure (UEP) and examined the relationship between UEP and upper extremity complications. From May 2020 to April 2022 at the University of Tokyo Hospital, UEP was measured in 155 patients undergoing RARP and 20 patients undergoing RARC. A total of 350 sets of UEP were investigated in this study. UEP was measured using a portable interface pressure sensor (Palm Q, Cape CO., Kanagawa, Japan) in the preoperative lithotripsy position (L-position), preoperative LT-position, and postoperative L-position. UEP was increased in the preoperative LT-position than in the preoperative L-position (right side 5.2 mmHg vs. 17.1 mmHg, left side 5.3 mmHg vs. 17.1 mmHg, P < 0.001, respectively), and was decreased in the postoperative L-position than in preoperative LT-position (right side 17.1 mmHg vs. 10.8 mmHg, left side 17.1 mmHg vs. 10.6 mmHg, P < 0.001, respectively). Eleven upper extremities developed shoulder pain. UEP of the preoperative LT-position tended to be higher in the upper extremity exhibiting shoulder pain (25.6 mmHg (15.4-30.3) vs. 17.1 mmHg (12.0-24.4) P = 0.0901). UEP measurements may help prevent postoperative shoulder pain.

Patient positioning during minimally invasive surgery: what is current best practice?

Introduction

Positioning injuries are a known surgical complication and can result in significant patient morbidity. Studies have shown a small but significant number of neurovascular injuries associated with minimally invasive surgery, due to both patient and case-specific factors. We sought to review the available literature in regards to pathophysiological and practical recommendations.

Methods

A literature search was conducted and categorized by level of evidence, with emphasis on prospective studies. The result comprised 14 studies, which were summarized and analyzed with respect to our study objectives.

Results

While incidence of positioning injury has been identified in up to one-third of prospective populations, its true prevalence after surgery is likely 2%-5%. The mechanism is thought to be intraneural disruption from stretching or pressure, which results in decreased perfusion. On a larger scale, this vascular compromise can lead to ischemia and rhabdomyolysis. Prevention hinges on addressing patient modifiable factors such as body mass index, judicious positioning with appropriate devices, and intraoperative team awareness consisting of recurrent extremity checks and time management.

Conclusion

The risk for positioning injuries is underappreciated. Surgeons who perform minimally invasive surgery should discuss the potential for these complications with their patients, and operative teams should take steps to minimize risk factors.