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A comparison of transthoracic impedance using standard defibrillation paddles and self-adhesive defibrillation pads

A comparison of transthoracic impedance using standard defibrillation paddles and self-adhesive defibrillation pads
A comparison of transthoracic impedance using standard defibrillation paddles and self-adhesive defibrillation pads
The success of defibrillation is related to transmyocardial current. This current is inversely proportional to transthoracic impedance (TTI). A similar TTI between different pads and paddles is important to deliver a consistent therapeutic dose to all subjects. Failure to do so may result in either insufficient or excessive transmyocardial current leading to a risk of failed defibrillation or tissue damage respectively. Several different types of defibrillation paddles and self-adhesive defibrillation pads are currently available for clinical use but the TTI achieved with each type has not been established. We measured TTI using two types of commonly used paddles and self-adhesive pads to establish whether any significant differences exist between the products. TTI in 40 adult males was measured using defibrillation paddles and self-adhesive defibrillation pads placed in the antero-apical position. Measurements were made using a 30 kHz low amplitude AC current and taken at end-expiration. Mean TTI (omega)+/-S.D. was 68.2+/-16.1 (Hewlett Packard paddles; A), 62.8+/-13.2 (Hewlett Packard pads; B), 64.6+/-14.3 (PhysioControl paddles; C) and 95.6+/-22.3 (PhysioControl pads; D). Significant differences existed between all groups (P < 0.05) except between B and C. Differences in TTI between A, B and C were small and probably of no clinical significance. TTI in group D is significantly larger. Although transmyocardial current is related to TTI, the relationship is complex and differences in TTI alone cannot predict the outcome from defibrillation.
defibrillation, transthoracic impedance, defibrillation paddles
0300-9572
43-6
Deakin, C.D.
560d993b-bbc9-4548-9990-272ed18a011d
McLaren, R.M.
9a11c858-cb9a-44c6-a5f2-4ad45ab974ac
Petley, G.W.
4f2da40b-3c7b-4adc-b75c-e24e62bb1cf0
Clewlow, F.
06b8840f-4ccd-48cc-9a1e-d89f4960960d
Dalrymple-Hay, M.J.
6d241503-b555-4b07-b038-e44d24e21767
Deakin, C.D.
560d993b-bbc9-4548-9990-272ed18a011d
McLaren, R.M.
9a11c858-cb9a-44c6-a5f2-4ad45ab974ac
Petley, G.W.
4f2da40b-3c7b-4adc-b75c-e24e62bb1cf0
Clewlow, F.
06b8840f-4ccd-48cc-9a1e-d89f4960960d
Dalrymple-Hay, M.J.
6d241503-b555-4b07-b038-e44d24e21767

Deakin, C.D., McLaren, R.M., Petley, G.W., Clewlow, F. and Dalrymple-Hay, M.J. (1998) A comparison of transthoracic impedance using standard defibrillation paddles and self-adhesive defibrillation pads. Resuscitation, 39 (1-2), 43-6. (doi:10.1016/S0300-9572(98)00117-8). (PMID:9918446)

Record type: Article

Abstract

The success of defibrillation is related to transmyocardial current. This current is inversely proportional to transthoracic impedance (TTI). A similar TTI between different pads and paddles is important to deliver a consistent therapeutic dose to all subjects. Failure to do so may result in either insufficient or excessive transmyocardial current leading to a risk of failed defibrillation or tissue damage respectively. Several different types of defibrillation paddles and self-adhesive defibrillation pads are currently available for clinical use but the TTI achieved with each type has not been established. We measured TTI using two types of commonly used paddles and self-adhesive pads to establish whether any significant differences exist between the products. TTI in 40 adult males was measured using defibrillation paddles and self-adhesive defibrillation pads placed in the antero-apical position. Measurements were made using a 30 kHz low amplitude AC current and taken at end-expiration. Mean TTI (omega)+/-S.D. was 68.2+/-16.1 (Hewlett Packard paddles; A), 62.8+/-13.2 (Hewlett Packard pads; B), 64.6+/-14.3 (PhysioControl paddles; C) and 95.6+/-22.3 (PhysioControl pads; D). Significant differences existed between all groups (P < 0.05) except between B and C. Differences in TTI between A, B and C were small and probably of no clinical significance. TTI in group D is significantly larger. Although transmyocardial current is related to TTI, the relationship is complex and differences in TTI alone cannot predict the outcome from defibrillation.

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Published date: November 1998
Keywords: defibrillation, transthoracic impedance, defibrillation paddles
Organisations: Faculty of Medicine

Identifiers

Local EPrints ID: 383388
URI: http://eprints.soton.ac.uk/id/eprint/383388
ISSN: 0300-9572
PURE UUID: 4a4e1d76-15cb-4ede-9685-fdbff346c55f
ORCID for G.W. Petley: ORCID iD orcid.org/0000-0002-3295-0444

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Date deposited: 22 Jan 2016 16:19
Last modified: 10 Dec 2019 01:53

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Contributors

Author: C.D. Deakin
Author: R.M. McLaren
Author: G.W. Petley ORCID iD
Author: F. Clewlow
Author: M.J. Dalrymple-Hay

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