Why the study?
What are the characteristics of energy delivery and transmyocardial impedance during AICD implantation?
What are the characteristics of energy delivery and transmyocardial impedance during AICD implantation?
This prospective study characterizes the electrical properties of defibrillation shocks, including transmyocardial impedance, during AICD implantation.
Provides foundational electrical data during AICD implantation; leaves open prospective validation of impedance-guided adjustments.
We set out to determine in a prospective fashion the characteristics of energy delivery related to defibrillation in a population of patients receiving the AICD. Specifically, we examined the characteristics of the delivered current, transmyocardial voltage, and transmyocardial impedance. Secondly, we determined the relationship between the energy delivered, the impedance encountered and the defibrillation threshold. Since the AICD will deliver a succession of shocks if the initial shock does not cardiovert, the effects of consecutive shocks at different energy levels on the transmyocardial impedance were also assessed.
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Lawrence et al. (1986) studied this question.
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