A Method for Intracardiac Recording of Monophasic Action Potentials in the Dog Heart in Situ

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Abstract
A technique for intracardiac recording of monophasic action potentials has been developed and some results are presented. The method appears to provide the requirements for extended studies of excitation, rhythmicity and impulse propagation in the heart in situ in both man and lower animals, and gives recordings which can be correlated in time with the conventionally recorded electrocardiogram. The method allows recording of the electrical activity in subendocardially situated atrial and ventricular muscle as well as in subendocardially situated parts of the conducting system; with further development of this method it should be possible to study changes in the amplitude, form and duration of the action potential.

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