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document
Stepwise hook extension technique for radiofrequency ablation therapy of hepatocellular carcinoma . OBJECTIVE Our study was designed to examine the efficacy of stepwise hook extension technique for radiofrequency ablation ( RFA ) therapy of hepatocellular carcinoma in a randomized controlled study . METHOD Twenty patients with hepatocellular carcinoma measuring < 25 mm were divided randomly into two equal groups . RFA was applied using our new stepwise hook extension technique in patients of group 1 , and the full extension method in group 2 . The 10-hook electrode of LeVeen needle was deployed in four steps to full extension during ablation in group 1 , and full extension at start of treatment in group 2 . RESULTS Roll-off was achieved in all 10 patients of group 1 , indicative of sufficient tumor coagulation , but only in 3 of 10 patients of group 2 . The median time to completion of treatment was 6 min and 55 s ( range 3 min to 14 min and 3 s ) and 15 min ( 6-15 min ) , respectively . The total power output used for RF was lower in group 1 than in group 2 ( median 271 vs. 1,045 W.m ) . The diameters of RFA-induced lesions were not significantly different between the groups ( group 1 : 27 , range 23-37 mm ; group 2 : 23 , 0-42 mm ) . CONCLUSIONS Application of RFA using stepwise hook extension technique is superior to the full extension method since it produces the same therapeutic effects within a short period using a lower energy .
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Intervention_Physical
Stepwise hook extension technique
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Intervention_Physical
stepwise hook extension technique for radiofrequency ablation ( RFA ) therapy
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Intervention_Physical
RFA
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Intervention_Physical
stepwise hook extension technique
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Intervention_Physical
full extension method
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Intervention_Other
10-hook electrode of LeVeen needle
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Outcome_Physical
Roll-off
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Outcome_Other
median time to completion of treatment
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Outcome_Other
total power output
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Outcome_Physical
diameters of RFA-induced lesions
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Outcome_Other
same therapeutic effects
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Participant_Condition
hepatocellular carcinoma
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Participant_Condition
hepatocellular carcinoma
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Participant_Sample-size
Twenty
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Participant_Condition
hepatocellular carcinoma measuring < 25 mm