Ventricular fibrillation frequency characteristics and time evolution in piglets: a developmental study.

Abstract:

BACKGROUND:Derived variables of ventricular fibrillation, such as the frequency distribution by fast Fourier transformation and its evolution over time, have been used to determine the optimum timing for defibrillation. We hypothesized that these frequency variables would differ among neonatal, young child and older child populations due to cardiac developmental and size differences. Such differences may have important implications for developing defibrillation algorithms for pediatric patients and for extrapolating adult defibrillation algorithms to children in VF. METHODS:Ventricular fibrillation was induced and recorded for 6 min in 4 kg (n = 11), 14 kg (n = 10), and 24 kg (n = 16) piglets, corresponding to neonatal, young child and older children. Mean, median, and dominant frequencies were computed in 30 s intervals and compared among weight classes. RESULTS:All frequency variables in all weight groups showed first a decline at 1.25-1.75 min, followed by a gradual rise and plateau. There were significant differences for mean, median and dominant frequencies among weight classes. Specifically, 14 kg piglets showed higher frequency variables overall with a time evolution that was different from that of 4 and 24 kg piglets. Mean frequency showed the most stable time evolution with the least moment-to-moment variability. CONCLUSION:The frequency waveform characteristics and time course are somewhat different in 14 kg piglets compared with 4 and 24 kg piglets. If similar differences are demonstrable among children of different weights and ages, AEDs designed to determine optimal timing of defibrillation shocks in adults by frequency waveform characteristics may require modification for use in children with VF.

journal_name

Resuscitation

journal_title

Resuscitation

authors

Indik JH,Donnerstein RL,Berg MD,Samson RA,Berg RA

doi

10.1016/j.resuscitation.2004.05.001

keywords:

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

85-92

issue

1

eissn

0300-9572

issn

1873-1570

pii

S0300957204001947

journal_volume

63

pub_type

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