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November 1, 1974Circulation

Myocardial Necrosis from Direct Current Countershock

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Key result

Shorter time intervals between discharges and smaller paddle electrodes produced greater myocardial necrosis following direct current countershock in dogs.

Authors

CDCharles F. DahlGEGordon A. EwyEWE. D. Warner

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Overview

Caution with rapid repeated small-paddle DC shocks in animals; leaves open optimal parameters for human use.

Key Points

  • To investigate how paddle electrode size and time intervals between shocks affect myocardial necrosis in dogs.
  • Forty-two dogs divided into seven groups, each receiving ten 240 watt-second countershocks.
  • Electrode sizes were varied: 8.0 cm, 12.8 cm, and 4.3 cm, with different time intervals between shocks.
  • Myocardial necrosis assessed using electrocardiographic mapping and heart examinations four days post-shock.
  • Shorter time intervals resulted in greater myocardial necrosis.
  • Smaller paddle electrodes caused more necrosis when time intervals were constant.
  • Larger paddle electrodes are recommended for safer direct current countershocks.

PICO

P
Population
42 dogs subjected to ten consecutive 240 watt-second countershocks to evaluate the effect of paddle size and time interval on myocardial necrosis, followed for 4 days.
I
Intervention / Comparator
Direct current countershock with varying paddle electrode sizes and time intervals vs Different paddle sizes (4.3, 8.0, 12.8 cm) and time intervals (15 sec, 1 min, 3 min) (Ten consecutive, 240 watt-second countershocks)
O
Primary Outcome
Myocardial necrosis quantitated by precordial electrocardiographic mapping and gross/microscopic examination

Cite This Study

Dahl et al. (1974) studied Myocardial necrosis (n=42). Direct current countershock with varying paddle electrode sizes and time intervals vs. Different paddle sizes (4.3, 8.0, 12.8 cm) and time intervals (15 sec, 1 min, 3 min) was evaluated on Myocardial necrosis quantitated by precordial electrocardiographic mapping and gross/microscopic examination. Shorter time intervals between discharges and smaller paddle electrodes produced greater myocardial necrosis following direct current countershock in dogs.

synapsesocial.com/papers/6a6b3d93547974b2dbf43df0https://doi.org/10.1161/01.cir.50.5.956
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