CAMK2G and Arrhythmia: Figure 4 highlights the first 20 pathways obtained by DAVID enrichment. In addition, the calcium signaling pathway was involved in 34 pathways and indirectly related to 33 pathways. Therefore, we presumed that the calcium signaling pathway is closely related to arrhythmia. The CaMKII, CNCA1C, and Ca2+ of the calcium signaling pathway were thus selected as the observation index in this study based on these findings combined with other relevant literature.