A METHOD FOR RECORDING MYOCARDIAL ECG IN ANIMALS DURING INTENSE VIBRATION
Medical research interim rept.
NAVAL MEDICAL RESEARCH INST BETHESDA MD
Pagination or Media Count:
In studies of effects of whole-body vibration in cats we have been unable to record the electrocardiogram using conventional methods when the animal is vibrated with peak acceleration exceeding about plus or minus 4 g. The present study shows, however, that the electrocardiogram can be recorded from myocardial electrodes during whole-body vibration with peak acceleration up to plus or minus 15 g. Satisfactory electrodes consist of two no. 30 AWG enameled copper wires sutured into the myocardium at one end of each wire with the two free ends brought out through the vascular system. Clinical quality electrocardiograms were not recorded using this method in anesthetized cats, but tracings were produced in which the base line and R waves are distinct throughout the period of vibration. This paper describes one method for implanting the electrodes and illustrates the results with reproductions of tracings from some of the experiments.
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