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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Smits, K.F.A.A. Malik, M. Lindemans, F. |
| Copyright Year | 1997 |
| Description | Author affiliation: Bakken Res. Center, Maastricht, Netherlands (Smits, K.F.A.A.) |
| Abstract | A finite difference computer model of a thorax with main anatomical structures was used to calculate DFT and impedance changes due to addition of 1, 2 and 3 subcutaneous 25 cm coil electrodes (SQ) to the Active Can (AC) of a defibrillator system using a 5 cm long right ventricular electrode (RV) and AC with 37 cm/sup 2/ projected area. The efficiency of a configuration was based on the 90 percentile of myocardial current density (J/sub 90/). Effects of natural variations in anatomy were simulated by variations of electrode and can positions. Clinical results from RV-AC systems (DFT=13 J, impedance 50.4 /spl Omega/) were used to derive model constants for DFT calculation. DFT, impedance and percentage AC current were calculated for 3 subpectoral AC positions, 12 RV positions and 1, 2 or 3 SQ at 3 heights and 3 distal tip positions at 0, 5 and 10 cm distance from dorsal mid-line. Adding 1, 2 or 3 SQ, combined for all positions of RV, AC and SQ, resulted in a DFT reduction from 13.0/spl plusmn/4.6 to 6.7/spl plusmn/1.9, 5.5/spl plusmn/1.4 and 5.0/spl plusmn/1.2 J, respectively. Shock impedance dropped from 50.4/spl plusmn/1.5 to 43.0/spl plusmn/2.4, 40.5/spl plusmn/2.3 and 39.2/spl plusmn/2.2 /spl Omega/, respectively. The DFT was dependent on SQ tip distance to dorsal mid-line, combined for 1, 2 and 3 SQ and all RV and AC positions, as follows. 5.7/spl plusmn/1.5 J at 0 cm, 5.8/spl plusmn/1.8 J at 5 cm and 6.4/spl plusmn/1.9 J at 10 cm. Thus addition of 25 cm SQ to an RV-AC defibrillation system reduces DFT with approximately half of the energy, the greatest DFT reduction is obtained with a single SQ; variation in SQ implant (distance of SQ tip to dorsal mid-line) has minor impact on DFT and impedance. |
| Starting Page | 259 |
| Ending Page | 262 |
| File Size | 568785 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780344456 |
| ISSN | 02766547 |
| DOI | 10.1109/CIC.1997.647880 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1997-09-07 |
| Publisher Place | Sweden |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Coils Electrodes Impedance Finite difference methods Thorax Anatomical structure Myocardium Current density Anatomy Electric shock |
| Content Type | Text |
| Resource Type | Article |
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