Is the orientation of the apical defibrillation paddle of importance during manual external defibrillation?
Is the orientation of the apical defibrillation paddle of importance during manual external defibrillation?
Objective: Transthoracic impedance (TTI) is a factor determining the magnitude of the transmyocardial current during external defibrillation. Minimising TTI increases the chances of successful defibrillation. Most external defibrillation paddles are rectangular in shape and can, therefore, be placed in a transverse or longitudinal orientation. The apical paddle is often placed in a transverse orientation. This may theoretically result in a higher TTI than a longitudinal orientation because of poorer contact at the lateral paddle edges. We compared TTI with the apical paddle in both a transverse and longitudinal orientation. Materials and methods: Twenty sequential anaesthetised patients were studied. A pair of defibrillator paddles were instrumented to measure paddle force. TTI was recorded pre-operatively at end-expiration with the apical paddle in both longitudinal and transverse orientations. The sternal paddle was placed in a longitudinal orientation for all measurements. Results: TTI decreased in both transverse and longitudinal orientations as paddle force increased. Transverse paddle orientation resulted in a significantly (P<0.01) higher TTI than longitudinal orientation at all paddle forces below 12 kg force. Conclusion: The longitudinal orientation of a rectangular defibrillation paddle provides a lower TTI than orientation horizontally.
transthoracic impedance, defibrillation, transmyocardial current
15-18
Deakin, Charles D.
560d993b-bbc9-4548-9990-272ed18a011d
Sado, Daniel M.
d2762586-ebb0-4e7e-8763-5413e45ea0ad
Petley, Graham W.
4f2da40b-3c7b-4adc-b75c-e24e62bb1cf0
Clewlow, Frank
94c8568b-d5ea-4446-a712-4fa1560895c2
January 2003
Deakin, Charles D.
560d993b-bbc9-4548-9990-272ed18a011d
Sado, Daniel M.
d2762586-ebb0-4e7e-8763-5413e45ea0ad
Petley, Graham W.
4f2da40b-3c7b-4adc-b75c-e24e62bb1cf0
Clewlow, Frank
94c8568b-d5ea-4446-a712-4fa1560895c2
Deakin, Charles D., Sado, Daniel M., Petley, Graham W. and Clewlow, Frank
(2003)
Is the orientation of the apical defibrillation paddle of importance during manual external defibrillation?
Resuscitation, 56 (1), .
(doi:10.1016/S0300-9572(02)00290-3).
(PMID:12505733)
Abstract
Objective: Transthoracic impedance (TTI) is a factor determining the magnitude of the transmyocardial current during external defibrillation. Minimising TTI increases the chances of successful defibrillation. Most external defibrillation paddles are rectangular in shape and can, therefore, be placed in a transverse or longitudinal orientation. The apical paddle is often placed in a transverse orientation. This may theoretically result in a higher TTI than a longitudinal orientation because of poorer contact at the lateral paddle edges. We compared TTI with the apical paddle in both a transverse and longitudinal orientation. Materials and methods: Twenty sequential anaesthetised patients were studied. A pair of defibrillator paddles were instrumented to measure paddle force. TTI was recorded pre-operatively at end-expiration with the apical paddle in both longitudinal and transverse orientations. The sternal paddle was placed in a longitudinal orientation for all measurements. Results: TTI decreased in both transverse and longitudinal orientations as paddle force increased. Transverse paddle orientation resulted in a significantly (P<0.01) higher TTI than longitudinal orientation at all paddle forces below 12 kg force. Conclusion: The longitudinal orientation of a rectangular defibrillation paddle provides a lower TTI than orientation horizontally.
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Published date: January 2003
Keywords:
transthoracic impedance, defibrillation, transmyocardial current
Organisations:
Clinical & Experimental Sciences
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Local EPrints ID: 383377
URI: http://eprints.soton.ac.uk/id/eprint/383377
ISSN: 0300-9572
PURE UUID: 69cc7b5a-1655-4c65-8b9e-a0535bb274eb
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Date deposited: 29 Jan 2016 09:38
Last modified: 15 Mar 2024 02:53
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Author:
Daniel M. Sado
Author:
Frank Clewlow
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