New method for predicting efficiency of heating by measuring bioimpedance during radiofrequency catheter ablation in humans

Wen Chin Ko, Shoei K.Stephen Huang, Jiunn Lee Lin, Wen Yi Shau, Ling Ping Lai, Paul H. Chen

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Introduction: Efficiency of heating (defined as the average temperature divided by the average power) during radiofrequency (RF) catheter ablation (RFCA) can be predicted by the electrode-tissue contact pressure before RFCA. To predict the efficiency of heating during RFCA, we prospectively measured bioimpedance and correlated the bioimpedance with the efficiency of heating in patients undergoing RFCA for supraventricular tachycardias. Method and Results: Of 239 RF applications in 55 patients, bioimpedance was measured from the distal pair of the electrodes of he ablation catheter using an extremely low current (10 μA at 45 kHz). Tip electrode temperature was measured with a closed-loop RF generator. Efficiency of heating and the difference (Δbioimpedance) between preablation bioimpedance (measured from the target ablation site) and baseline bioimpedance (measured in the right atrium without tissue contact) were calculated. There was significant positive correlation between preablation bioimpedance and efficiency of heating (regression coefficient = 0.053; P = 0.003) and between Δbioimpedance and efficiency of heating (regression coefficient = 0.067; P = 0.003). The highest degree of correlation was found during RFCA of the accessory pathways in the left free wall (regression coefficient = 0.14; P < 0.01). With preablation Δbioimpedance >21.5 Ω, applications targeted at the left free-wall, left posteroseptal, or right septal accessory pathways had a greater likelihood of achieving effective tissue heating (defined as maximal temperature achieved >55°C). Conclusion: Both preablation bioimpedance and Δbioimpedance have positive correlation with efficiency of heating during RFCA of supraventricular tachycardia. Measuring preablation bioimpedance appears to be a useful tool for predicting the efficiency of heating during RFCA.

Original languageEnglish
Pages (from-to)819-823
Number of pages5
JournalJournal of Cardiovascular Electrophysiology
Volume12
Issue number7
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

Fingerprint

Catheter Ablation
Heating
Electrodes
Supraventricular Tachycardia
Temperature
Heart Atria
Pressure

Keywords

  • Bioimpedance
  • Catheter ablation
  • Efficiency of heating

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

New method for predicting efficiency of heating by measuring bioimpedance during radiofrequency catheter ablation in humans. / Ko, Wen Chin; Huang, Shoei K.Stephen; Lin, Jiunn Lee; Shau, Wen Yi; Lai, Ling Ping; Chen, Paul H.

In: Journal of Cardiovascular Electrophysiology, Vol. 12, No. 7, 01.01.2001, p. 819-823.

Research output: Contribution to journalArticle

Ko, Wen Chin ; Huang, Shoei K.Stephen ; Lin, Jiunn Lee ; Shau, Wen Yi ; Lai, Ling Ping ; Chen, Paul H. / New method for predicting efficiency of heating by measuring bioimpedance during radiofrequency catheter ablation in humans. In: Journal of Cardiovascular Electrophysiology. 2001 ; Vol. 12, No. 7. pp. 819-823.
@article{e8fcfa1d332f46dab49be0241ba1c372,
title = "New method for predicting efficiency of heating by measuring bioimpedance during radiofrequency catheter ablation in humans",
abstract = "Introduction: Efficiency of heating (defined as the average temperature divided by the average power) during radiofrequency (RF) catheter ablation (RFCA) can be predicted by the electrode-tissue contact pressure before RFCA. To predict the efficiency of heating during RFCA, we prospectively measured bioimpedance and correlated the bioimpedance with the efficiency of heating in patients undergoing RFCA for supraventricular tachycardias. Method and Results: Of 239 RF applications in 55 patients, bioimpedance was measured from the distal pair of the electrodes of he ablation catheter using an extremely low current (10 μA at 45 kHz). Tip electrode temperature was measured with a closed-loop RF generator. Efficiency of heating and the difference (Δbioimpedance) between preablation bioimpedance (measured from the target ablation site) and baseline bioimpedance (measured in the right atrium without tissue contact) were calculated. There was significant positive correlation between preablation bioimpedance and efficiency of heating (regression coefficient = 0.053; P = 0.003) and between Δbioimpedance and efficiency of heating (regression coefficient = 0.067; P = 0.003). The highest degree of correlation was found during RFCA of the accessory pathways in the left free wall (regression coefficient = 0.14; P < 0.01). With preablation Δbioimpedance >21.5 Ω, applications targeted at the left free-wall, left posteroseptal, or right septal accessory pathways had a greater likelihood of achieving effective tissue heating (defined as maximal temperature achieved >55°C). Conclusion: Both preablation bioimpedance and Δbioimpedance have positive correlation with efficiency of heating during RFCA of supraventricular tachycardia. Measuring preablation bioimpedance appears to be a useful tool for predicting the efficiency of heating during RFCA.",
keywords = "Bioimpedance, Catheter ablation, Efficiency of heating, Bioimpedance, Catheter ablation, Efficiency of heating",
author = "Ko, {Wen Chin} and Huang, {Shoei K.Stephen} and Lin, {Jiunn Lee} and Shau, {Wen Yi} and Lai, {Ling Ping} and Chen, {Paul H.}",
year = "2001",
month = "1",
day = "1",
doi = "10.1046/j.1540-8167.2001.00819.x",
language = "English",
volume = "12",
pages = "819--823",
journal = "Journal of Cardiovascular Electrophysiology",
issn = "1045-3873",
publisher = "Wiley-Blackwell",
number = "7",

}

TY - JOUR

T1 - New method for predicting efficiency of heating by measuring bioimpedance during radiofrequency catheter ablation in humans

AU - Ko, Wen Chin

AU - Huang, Shoei K.Stephen

AU - Lin, Jiunn Lee

AU - Shau, Wen Yi

AU - Lai, Ling Ping

AU - Chen, Paul H.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Introduction: Efficiency of heating (defined as the average temperature divided by the average power) during radiofrequency (RF) catheter ablation (RFCA) can be predicted by the electrode-tissue contact pressure before RFCA. To predict the efficiency of heating during RFCA, we prospectively measured bioimpedance and correlated the bioimpedance with the efficiency of heating in patients undergoing RFCA for supraventricular tachycardias. Method and Results: Of 239 RF applications in 55 patients, bioimpedance was measured from the distal pair of the electrodes of he ablation catheter using an extremely low current (10 μA at 45 kHz). Tip electrode temperature was measured with a closed-loop RF generator. Efficiency of heating and the difference (Δbioimpedance) between preablation bioimpedance (measured from the target ablation site) and baseline bioimpedance (measured in the right atrium without tissue contact) were calculated. There was significant positive correlation between preablation bioimpedance and efficiency of heating (regression coefficient = 0.053; P = 0.003) and between Δbioimpedance and efficiency of heating (regression coefficient = 0.067; P = 0.003). The highest degree of correlation was found during RFCA of the accessory pathways in the left free wall (regression coefficient = 0.14; P < 0.01). With preablation Δbioimpedance >21.5 Ω, applications targeted at the left free-wall, left posteroseptal, or right septal accessory pathways had a greater likelihood of achieving effective tissue heating (defined as maximal temperature achieved >55°C). Conclusion: Both preablation bioimpedance and Δbioimpedance have positive correlation with efficiency of heating during RFCA of supraventricular tachycardia. Measuring preablation bioimpedance appears to be a useful tool for predicting the efficiency of heating during RFCA.

AB - Introduction: Efficiency of heating (defined as the average temperature divided by the average power) during radiofrequency (RF) catheter ablation (RFCA) can be predicted by the electrode-tissue contact pressure before RFCA. To predict the efficiency of heating during RFCA, we prospectively measured bioimpedance and correlated the bioimpedance with the efficiency of heating in patients undergoing RFCA for supraventricular tachycardias. Method and Results: Of 239 RF applications in 55 patients, bioimpedance was measured from the distal pair of the electrodes of he ablation catheter using an extremely low current (10 μA at 45 kHz). Tip electrode temperature was measured with a closed-loop RF generator. Efficiency of heating and the difference (Δbioimpedance) between preablation bioimpedance (measured from the target ablation site) and baseline bioimpedance (measured in the right atrium without tissue contact) were calculated. There was significant positive correlation between preablation bioimpedance and efficiency of heating (regression coefficient = 0.053; P = 0.003) and between Δbioimpedance and efficiency of heating (regression coefficient = 0.067; P = 0.003). The highest degree of correlation was found during RFCA of the accessory pathways in the left free wall (regression coefficient = 0.14; P < 0.01). With preablation Δbioimpedance >21.5 Ω, applications targeted at the left free-wall, left posteroseptal, or right septal accessory pathways had a greater likelihood of achieving effective tissue heating (defined as maximal temperature achieved >55°C). Conclusion: Both preablation bioimpedance and Δbioimpedance have positive correlation with efficiency of heating during RFCA of supraventricular tachycardia. Measuring preablation bioimpedance appears to be a useful tool for predicting the efficiency of heating during RFCA.

KW - Bioimpedance

KW - Catheter ablation

KW - Efficiency of heating

KW - Bioimpedance

KW - Catheter ablation

KW - Efficiency of heating

UR - http://www.scopus.com/inward/record.url?scp=0034973414&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034973414&partnerID=8YFLogxK

U2 - 10.1046/j.1540-8167.2001.00819.x

DO - 10.1046/j.1540-8167.2001.00819.x

M3 - Article

C2 - 11469435

AN - SCOPUS:0034973414

VL - 12

SP - 819

EP - 823

JO - Journal of Cardiovascular Electrophysiology

JF - Journal of Cardiovascular Electrophysiology

SN - 1045-3873

IS - 7

ER -