Key result
Defibrillator shocks >9 J delivered during baseline rhythm or defibrillation testing resulted in a 10% to 15% reduction in cardiac index (P=0.001 for 27-34 J), proportional to shock strength.
Why the study?
Do ventricular defibrillator shocks adversely affect cardiac hemodynamics in patients undergoing defibrillator implantation?
Population
17 patients undergoing nonthoracotomy defibrillator implantation
Comparison
Ventricular defibrillator shocks of varying… vs Baseline cardiac index before shock delivery
Design
Cohort
Follow-up
4 minutes post-shock
Authors
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High-energy shocks were associated with transient hemodynamic effects; hypothesis-generating for lower-energy strategies but should not yet change practice.
Observational (n=17)
Do ventricular defibrillator shocks adversely affect cardiac hemodynamics in patients undergoing defibrillator implantation?
Absolute Event Rate: 2.14% vs 2.3%
p-value: p=0.001
High-energy defibrillator shocks (>9 J) cause a transient, dose-dependent reduction in cardiac index, suggesting a hemodynamic benefit to using lower-energy defibrillation when possible.
Tokano et al. (1998) conducted an observational in Patients undergoing nonthoracotomy defibrillator implantation (n=17). Ventricular defibrillator shocks vs. Before shock was evaluated on Cardiac index (p=0.001). Defibrillator shocks >9 J delivered during baseline rhythm or defibrillation testing resulted in a 10% to 15% reduction in cardiac index (P=0.001 for 27-34 J), proportional to shock strength.
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