Hepatic bipolar radio-frequency ablation between separated multiprong electrodes

Haemmerich, Dieter; Staelin, T.; Tungjitkusolmun, S.; Lee, F.T.; Mahvi, David M.; Webster, John G.

doi:10.1109/10.951517

Cited by 116 publications

(83 citation statements)

References 23 publications

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“…b In the metastases group, the regression line equation was V=0.552XE+10.071 (R 2 =0.687). If the outlier to the right of the graph is eliminated, the correlation is better (R 2 = 0.718) approach also permits to avoid adverse events inherent to the monopolar technique, such as unpredictable electrical current paths, heterogeneous energy deposition and skin burns at the grounding pad [15,[27][28][29]. Although the technical aspects of multipolar RF ablation have been addressed, published clinical experience with percutaneous use of this technology is still limited [18,30].…”

Section: Discussionmentioning

confidence: 99%

Image-guided multipolar radiofrequency ablation of liver tumours: initial clinical results

et al. 2007

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The local effectiveness and clinical usefulness of multipolar radiofrequency (RF) ablation of liver tumours was evaluated. Sixty-eight image-guided RF sessions were performed using a multipolar device with bipolar electrodes in 53 patients. There were 45 hepatocellular carcinomas (HCC) and 42 metastases with a diameter ≤3 cm (n=55), 3.1-5 cm (n=29) and >5 cm (n=3); 26 nodules were within 5 mm from large vessels. Local effectiveness and complications were evaluated after RF procedures. Mean follow-up was 17±10 months. Recurrence and survival rates were analysed by the Kaplan-Meier method. The primary and secondary technical effectiveness rate was 82% and 95%, respectively. The major and minor complication rate was 2.9%, respectively. The local tumour progression at 1-and 2-years was 5% and 9% for HCC nodules and 17% and 31% for metastases, respectively; four of 26 nodules (15%) close to vessels showed local progression. The survival at 1 year and 2 years was 97% and 90% for HCC and 84% and 68% for metastases, respectively. Multipolar RF technique creates ablation zones of adequate size and tailored shape and is effective to treat most liver tumours, including those close to major hepatic vessels.

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Section: Discussionmentioning

confidence: 99%

Image-guided multipolar radiofrequency ablation of liver tumours: initial clinical results

et al. 2007

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“…[5] To overcome the drawback of monopolar RFT, various techniques and modes have been proposed, including multiple probes RFT applied in the form of either simultaneous [6] or alternative RFT, [7] and bipolar RFT. [8][9][10][11] However, to date, as far as we know, there is no published data evaluating the efficiency of RFT for the treatment of lower extremity ischemic pain and compare the effectivity of monopolar RFT and bipolar RFT mode.…”

Section: Introductionmentioning

confidence: 99%

Radiofrequency termocoagulation for the treatment of lower extremity ischemic pain: Comparison of monopolar and bipolar modes

Destegül¹,

Işik²,

Özbek³

et al. 2017

Agri

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SummaryObjectives: Radiofrequency thermocoagulation (RFT) has been reported to be used safely to treat ischemic lower extremity pain. The objective of the present study was to evaluate efficiency of RFT for treatment of lower extremity ischemic pain and to compare effectiveness of monopolar RFT and bipolar RFT modes. Methods: Following ethics committee approval, 30 American Society of Anesthesiologists classification I-III patients with ischemic lower extremity pain aged between 18 and 65 years were recruited. Patients were randomly allocated into 2 groups: MRT group (n=15) received monopolar RFT (80°C) for 2 minutes at L2-3 level, and BRT group (n=15) received bipolar RFT (80°C) for 2 minutes at L2-3 level. Systolic and diastolic blood pressure, heart rate, pain score, and supplemental analgesic requirements were recorded at 24 hours after application and at 7, 30, and 90 days. Results: Numerical rating scale values in both groups decreased significantly over time and it was found to be significantly lower in BRT group after first and third months (p<0.05). Supplemental analgesic requirements were similar with no significant difference between the 2 groups at any point of study period (p>0.05). No adverse event or complication related to procedure or treatment was reported. Conclusion: In patients with ischemic lower extremity pain, both monopolar and bipolar RFT treatment modalities were found to significantly decrease pain levels. However, bipolar mode led to lower pain scores at 30 and 90 days, and longer duration of analgesia than monopolar mode.Keywords: Radiofrequency thermocoagulation; monopolar; bipolar; ischemic pain; lumbar sympatholysis. ÖzetAmaç: Alt ekstremitenin iskemik ağrı tedavisi için radyofrekans termokoagülasyon'un (RFT) güvenle kullanılabileceği bildirilmiştir. Bu çalışmanın amacı alt ekstremitenin iskemik ağrı tedavisi için RFT'un etkinliğini değerlendirmek ve monopolar ve bipolar RFT modlarını karşılaştırmaktı. Gereç ve Yöntem: Etik komite kabulünü takiben alt ekstremite iskemik ağrısı olan, yaşları 18-65 yaş arası, ASA I-III grubu, 30 hasta çalışmaya alındı. Hastalar MRT grubunda (n=15) L 2-3 düzeyinden 2 dakika monopolar RFT (80°C), BRT grubunda (n=15) ise L 2-3 düzeyinden 2 dakika bipolar RFT (80°C) almak üzere rastgele iki gruba ayrıldı. Sistolik ve diastolik kan basınçları, kalp atım hızı, ağrı skorları (NRS) ve ek analjezik ihtiyaçları hastaneden taburcu edildikten 24 saat ve 7, 30 ve 90. günlerde kaydedildi. Bulgular: Her iki grupta NRS skorlarının zaman içerisinde önemli derecede azaldığı ve BRT grubunda MRT grubuna göre 30 ve 90. günlerde istatistiksel olarak önemli derecede daha düşük olduğu tespit edildi (p<0.05). Bununla birlikte, ek analjezik ihtiyacının iki grupta benzer olduğu ve iki grup arasında çalışma periyodlarında istatistiksel fark oluşturmadığı tespit edildi (p>0.05). İşlem veya tedaviye ilişkin yan etki veya komplikasyon bildirilmedi. Sonuç: Alt ekstremitenin iskemik ağrı tedavisinde hem monopolar hem de bipolar radyofrekans termokoagülasyon tedavi modalitelerinin ...

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“…The details of the FEM and its implementation for bioelectromagnetic problems are available. [74][75][76][77][78][79][80][81][82][83][84][85][86] …”

Section: Iib Modeling Power Depositionmentioning

confidence: 99%

Thermal Therapy, Part IV: Electromagnetic and Thermal Dosimetry

Habash

Bansal

Krewski

et al. 2007

Crit Rev Biomed Eng

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ABSTRACT:In this article some of the important techniques in electromagnetic (EM) and thermal dosimetry are reviewed. Three major areas are discussed: modeling power deposition and estimation of EM energy absorbed by tissues exposed to EM radiation, electrical-thermal modeling for thermal therapy with various models of heat transfer in living tissues, and thermal dosimetry using invasive and noninvasive thermometry. Knowledge about the temperature distributions achieved can only be obtained by treatment planning of patient therapy. This process is called thermal therapy planning system (TTPS), which is a large and complex system for design, control, documentation, and evaluation of the treatment that also provides data for treatment optimization. Various imaging techniques for guidance and monitoring necessary for clinical treatments are also discussed. The review concludes by suggesting future avenues for investigations.

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Hepatic bipolar radio-frequency ablation between separated multiprong electrodes

Cited by 116 publications

References 23 publications

Image-guided multipolar radiofrequency ablation of liver tumours: initial clinical results

Image-guided multipolar radiofrequency ablation of liver tumours: initial clinical results

Radiofrequency termocoagulation for the treatment of lower extremity ischemic pain: Comparison of monopolar and bipolar modes

Thermal Therapy, Part IV: Electromagnetic and Thermal Dosimetry

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