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. 2020 May 13;15(5):e0232457. doi: 10.1371/journal.pone.0232457

Fig 1. Quality of electrocardiography (ECG) signals is improved by optimizing location of the probes and microsurgery.

Fig 1

A, Different ECG waveform with distinct P, R, S, and T waves when probes were at a different location relative to the heart (red dots). We recommend aligning the positive probe to the heart (ii), whereby the ECG waveform is similar to that in humans. B, Microsurgery was conducted to open the pericardium sac and thus eliminate noise and enhance amplitude of the waveforms by about 10-fold. C, Change in heart rate with surgery. bpm indicates beats per minute; WT, wild-type.