title: Partial nephrectomy without renal ischemia using an electromagnetic thermal surgery system in a porcine model.
abstract: OBJECTIVE
  To test the feasibility of partial nephrectomy using needle arrays under alternating current (AC) electromagnetic field without renal artery clamping.
  
  
  METHODS
  We performed an experimental study for partial nephrectomy without renal artery clamping in a porcine model, comparing a new thermal surgery system consisting of an AC electromagnetic field generator and stainless steel needle arrays (using 10 pigs) vs an ultrasonic Harmonic Scalpel (on 8 pigs). Two cm of the upper pole of the kidneys were resected, and then the feasibility, operation time, blood loss, biochemical parameters, pathology, and complications were observed for 14 days.
  
  
  RESULTS
  There was no difference by weight in the mean percentage of kidney removed between the 2 groups (8.1 ± 3.4% vs 12.7 ± 5.5%). The estimated blood loss for the partial nephrectomy with electromagnetic thermal surgery system was significantly less compared to the ultrasonic Harmonic Scalpel (53.0 ± 73.0 vs 188.8 ± 49.3 mL). Transection time was shorter with the electromagnetic thermal surgery system (10 vs 12 minutes). Bleeding from the cut surface after partial nephrectomy was noted in 2 pigs (electromagnetic surgery group) and 8 pigs (control group); all the bleeding was controlled with additional monopolar electrocoagulation and sutures. No urinoma was identified in either group when a second laparotomy was performed 2 weeks later.
  
  
  CONCLUSIONS
  Our study of a partial nephrectomy in a porcine model demonstrates that the heat generated by the electromagnetic thermal surgery system is sufficient to coagulate renal parenchyma and to seal off the blood vessels without pedicle clamping.
authors: Department of Urology, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
authors: Chien-Hui
authors: CH
authors: Ou
authors: Wen-Horng
authors: WH
authors: Yang
authors: Hung-Wen
authors: HW
authors: Tsai
authors: Tung-Jen
authors: TJ
authors: Lee
authors: Szu-Yin
authors: SY
authors: Chen
authors: Sheng-Chieh
authors: SC
authors: Huang
authors: Yi-Yuan
authors: YY
authors: Chang
authors: Gwo-Bin
authors: GB
authors: Lee
authors: Xi-Zhang
authors: XZ
authors: Lin
mesh_terms: D000818:Animals; D003972:Diathermy / Q000379:methods*; D004195:Disease Models, Animal; D006489:Hemostatic Techniques; D007511:Ischemia / Q000517:prevention & control*; D007668:Kidney / Q000098:blood supply* / Q000601:surgery; D007674:Kidney Diseases / Q000601:surgery; D010535:Laparoscopy / Q000379:methods*; D008297:Male; D009392:Nephrectomy / Q000379:methods*; D012077:Renal Artery / Q000601:surgery*; D013552:Swine