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. Author manuscript; available in PMC: 2007 Nov 29.
Published in final edited form as: Heart Rhythm. 2007 Jul 14;4(11):1430–1436. doi: 10.1016/j.hrthm.2007.07.002

Figure 2.

Figure 2

Optrode recordings of intramural action potentials. Panel A, Intramural action potentials measured with a 325-μm fiber optrode in a porcine heart perfused with Tyrode solution. Numbers 1 through 6 designate recordings obtained from sub-epicardium through sub-endocardium. One fiber was outside the muscle in the cavity (not shown). Panel B, Intramural action potentials measured in a blood perfused heart. Panel C, Reduction of the average signal-to-noise ratio (SNrms) during the time of experiment in one heart.