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Analog‐Digital Recording of Current and Voltage During High Voltage DC Shocks
Author(s) -
PETERS WERNER,
SCHARF RAINER,
MEESMANN MALTE
Publication year - 1995
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1995.tb02506.x
Subject(s) - capacitance , voltage , electrical impedance , digitization , electrical engineering , sampling (signal processing) , resistive touchscreen , medicine , electronic engineering , computer science , physics , telecommunications , engineering , electrode , filter (signal processing) , quantum mechanics
Efficient on‐line digitization is the prerequisite for computerized analysis of the electrical phenomena occurring during defibrillation. Conventional hardware presently provides only limited time resolution. The performance of various digitization rates for recording of voltage, current, and calculation of derived quantities like impedance, energy, and defibrillator capacitance was investigated. It was assessed both experimentally and by computer simulation of a trapezoidal discharge (of 9 msec duration into a constant resistive load of 50 Ω with a defibrillator capacitance of 132 μF). The accuracy achieved with different digitization rates is given. For example, an accuracy of 1% for analog‐digital conversion for impedance calculation during this kind of DC shock requires a sampling rate of 8 kHz without, and a rate of 1 kHz with linear interpolation to correct for the hardware dependent error due to sequential sampling. Conclusion: Highly efficient analog‐digital conversion of delivered voltage and current during DC shocks is available within the limits of conventional inexpensive hardware.