234 - Radiofrequency Ablation of Metastatic Spine Tumor Using New Internally...

#234 Radiofrequency Ablation of Metastatic Spine Tumor Using New Internally Cooled Electrode and Vertebroplasty

Spine Tumors

Poster Presented by: S. Yi

Author(s):

S. Yi (1)
N.K. You (2)
D.A. Shin (1)
H.Y. Lee (1)
K.N. Kim (1)
D.H. Yoon (1)

(1) Spine and Spinal Cord Institute,Yonsei University, College of Medicine, Neurosurgery, Seoul, Korea, Republic of
(2) Ajou University School of Medicine, Neurosurgery, Suwon, Korea, Republic of

Abstract

Study Design: Retrospective reivew of radiofrequency ablation of metastatic spinal tumors with internally cooled electrode.

Objective: To study the efficacy and safety of radiofrequency ablation using internally cooled electrode in metastatic spine tumor. Additional vertebroplasty may be used for tumor cell death and spine augmentation.

Surmmary of Background data: Internally cooled electrode was designed for larger ablation volume by adjustable electrode tip and can conduct more enegery. This may reduce disadvantage of previous available ablation methods. The effect of additional bone cement injection was enhancing tumor cell death and augmenting spinal stability.

Methods: Radiofrequency ablation was performed in seven vertebral bodies of five patients with stage 4 cancer disease. Ablation was done in prone position with local anesthesia and minimal risk. Vertebroplasty was done after ablation in 6 lesions with polymethylmethacrylate. Preop and postoperative clinical parameters and radiologic results were assessed. Ablation time and volume was calculated and analyzed.

Results: Preoperative mean visual analogue scale (VAS) was 5 points and after ablation it decreased to 1.5 points in mean value. Average impedence was 79.85±16.61 ohm and output energy was 62 ± 27.42 watt. Mean albation time was 268.43 ± 64.61 seconds. Average ablation volume was 2.71 ± 0.58 cm3. There was tendancy between ablation time and ablated volume in correlation analysis but it was not statistically significant. Mean survival period after radiofrequency ablation was 118.4 days. Complication during or after ablation was not occurred and procedure did not aggravate disease.

Conclusion: Internally cooled electrode was archieved more effective ablation in metastatic spinal tumor. The correlation tendency between ablation volume and time will be contribute to further investigation and treatment of radiofrequency ablation in spine tumors.

Keywords: Internally cooled electrode, Metastasis, Radiofrequency ablation, Spine tumor, Vertebroplasty.