Roll-Off Displacement in Ex Vivo Experiments of RF Ablation With Refrigerated Saline Solution and Refrigerated Deionized Water
| Autor: | Paulo Roberto do Santos, Ronei Delfino da Fonseca, Guilherme dos Anjos Guimarães, Bruno da Costa Motta, Suélia de Siqueira Rodrigues Fleury Rosa, Melissa Silva Monteiro, Ricardo Perzuol Jacobi, Marina Pinheiro Marques |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
medicine.medical_treatment 0206 medical engineering Biomedical Engineering Temperature Water 02 engineering and technology Ablation 020601 biomedical engineering Perfusion Necrosis Volume (thermodynamics) Liver medicine Catheter Ablation Tissue necrosis Animals Cattle Saline Solution Saline Displacement (fluid) Rf ablation Ex vivo Biomedical engineering |
| Zdroj: | IEEE transactions on bio-medical engineering. 66(5) |
| ISSN: | 1558-2531 |
| Popis: | Objective: The recurrence rate in the treatment of liver tumors using radio frequency ablation (RFA) is often related to incomplete tissue necrosis and consequently the limitation in the ablation volume. This paper proposes an ablation protocol combined with the infusion of saline solution and deionized water aiming at achieving a time displacement in the roll-off occurrence and consequently increasing the volume of ablation. Methods: An infusion of saline solution and deionized water at 5 and 23 $^\circ$ C was performed to evaluate the influence of these liquids on the RFA procedure in ex vivo bovine liver pieces. The obtained results were used to propose a mathematical model of the roll-off phenomenon by means of the system identification techniques. Results: The RFA combined with the infusion of saline solution 0.9% at 5 $^\circ$ C presented optimal results, with a time delay of the roll-off occurrence in 27.8% compared to pure RFA ( $p$ = 0.002) and an increase in the necrotic volume of 51.2% ( $p$ = 0.0002). Two Box–Jenkins models were obtained to describe the roll-off phenomenon: 1) pure RFA; and 2) RFA combined with the saline solution 0.9% at 5 $^\circ$ C. Conclusion: The RFA therapy combined with the saline solution 0.9% at 5 $^\circ$ C increases the time range to the roll-off occurrence, leading to higher necrosis volumes in ex vivo bovine liver samples. The development of a mathematical model to describe the roll-off behavior demonstrated that the transient response is improved by the infusion of the saline solution 0.9% at 5 $^\circ$ C. |
| Databáze: | OpenAIRE |
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