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BackgroundDecreased perfusion in the lower extremities is one of the several adverse effects of placing patients in a lithotomy or Trendelenburg position during surgery. This study aimed to evaluate the effects of patient positioning in lower limb perfusion patients undergoing robotic-assisted laparoscopic radical prostatectomy (RARP) using near-infrared spectroscopy (NIRS).MethodsThis observation study comprised 30 consenting males with American Society of Anaesthesiologists physical status classes I and II (age range, ≥20 to < 80 years). Regional saturation of oxygen measurements was obtained using an INVOS™ oximeter (Somanetics, Troy, MI, USA). A NIRS sensor was positioned on the surface of the skin at the mid-diaphyseal region of the calf muscles (the gastrocnemius and soleus), over the posterior compartment, in the right lower leg. Regional saturation of oxygen (rSO2) was sampled during the following time points: before and 5 min after induction of anaesthesia (T0,T1); 5 min after establishment of pneumoperitoneum in a 0° lithotomy position (T2); 5 min after a 25° Trendelenburg position (T3); 30, 60, 90 and 120 min after pneumoperitoneum in a Trendelenburg position (T4, T5, T6 and T7, respectively); after desufflation in a supine position (T8); and after tracheal extubation (T9).ResultsLower limb perfusion evaluated by NIRS was increased after induction of anaesthesia and maintained during steep Trendelenburg positions in RARP patients with no risk for lower limb compartment syndrome (LLCS) (T0:65 ± 7.2%, T1:69 ± 6.1%, T2:70±:6.1%, T3:68 ± 6.7%, T4:66 ± 7.5%, T5:67 ± 6.9%, T6:68 ± 7.2%, T8:73 ± 7.2%, T9:71 ± 7.9%, respectively).ConclusionsLower limb perfusion evaluated by NIRS was maintained during the RARP procedure. Correct patient positioning and careful assessment of risk factors such as vascular morbidity could be important for the prevention of LLCS during RARP.

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Objectives: Subcutaneous emphysema (SCE) is a complication associated with laparoscopic surgery. Severe SCE complicated by excessive hypercarbia may afford detrimental effects in surgical patients with cardiac dysfunction. Robotic-assisted laparoscopic radical prostatectomy (RALP) has several predisposing factors that contribute to SCE. The main purpose of our single-center retrospective study was to determine the preoperative and intraoperative predicting factors for SCE associated with RALP and to determine the actual incidence of SCE. Methods: In total, 229 adult male patients underwent standardized RALP for prostate cancer over the period of 1 May 2016 to 31 October 2018 at the Ehime University Hospital. We reviewed electronic clinical records for individual characteristics including age, body weight, height, coexisting disorders, preoperative ASA physical status, and the length of postoperative hospital stay. We also reviewed surgical and anesthetic records for the operation time, anesthetic method, and the partial pressure of end-tidal CO2 (PetCO2) during RALP. To determine the presence of SCE, we examined supine chest X-rays obtained after the completion of surgery. Results: We found 55 cases (24.0%) of SCE. Multiple logistic regression analysis showed that a BMI < 25 kg/m2 (OR: 3.0, 95% CI: 1.25–7.26) and a maximum value of PetCO2 of 46 mmHg or greater (OR: 23.3, 95% CI: 8.22–66.1) were independent predicting factors for SCE. Conclusion: These two predicting factors may be helpful to recognize the occurrence of SCE. Anesthesiologists should protect against SCE progression with the earlier detection of SCE for safe anesthetic management in patients undergoing RALP.

FDG-PET/CT findings could be useful for clinically grading ATL.