Key result
Low-energy shocks (≤100 J) for ventricular defibrillation achieved only a 20% success rate in patients with high transthoracic impedance (>97 ohms) versus 70% in those with lower impedance (p<0.05).
Why the study?
Can transthoracic impedance be accurately predicted in advance of defibrillation to determine the likelihood of success for low-energy shocks?
Population
115 patients receiving shocks for ventricular or atrial arrhythmias.
Comparison
Advance prediction of transthoracic impedance… vs Actual impedance; low or average impedance.
Design
Cohort
Authors
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High transthoracic impedance predicts low-energy shock failure; hypothesis-generating for pre-defibrillation impedance-guided energy selection.
Observational (n=115)
Can transthoracic impedance be accurately predicted in advance of defibrillation to determine the likelihood of success for low-energy shocks?
Absolute Event Rate: 20% vs 70%
p-value: p=<0.05
Advance prediction of transthoracic impedance accurately identifies patients with high impedance in whom low-energy defibrillation shocks are likely to fail.
Kerber et al. (1984) conducted an observational in Ventricular and atrial arrhythmias (n=115). Low-energy shocks in high transthoracic impedance (>97 ohms) vs. Low or average impedance was evaluated on Success rate of low-energy shocks for ventricular defibrillation (p=<0.05). Low-energy shocks (≤100 J) for ventricular defibrillation achieved only a 20% success rate in patients with high transthoracic impedance (>97 ohms) versus 70% in those with lower impedance (p<0.05).
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