A method for simultaneous brain stimulation and electrocardiographic recording in unanesthetized free-moving cats

Abstract

A new method for simultaneous brain stimulation and electrocardiographic re­ cording in unanesthetized free-moving cats has been described in order to avoid the effect of anesthetic or curare-like agents. I was found that the E.K.G. recordings in chronic preparation using the implantable electrodes of E & M Instruments Co. Inc. U.S.A., were free of artefacts and do not showed modifications of the electrocardio­ gram from day to day.

With our preparation electrocardiographic ischemic-like changes or ectopic beats as an effect of electrical stimulation of the brain was never observed in spite that such a changes has been previously described by several authors.