Fig. 6: Long-term stability and biocompatibility evaluation of the ECG monitoring system.

a ECG waveforms recorded on Day 0, Day 1, Day 3, and Day 5. b Serum biochemical indices (ALT, AST, BUN, and CRE). c, d Hematoxylin and Eosin (H&E) stain present in ×400 magnification. ns not significant