How to convert ECG Data to Graphical Data so that it can be used in GNNs?

I am trying to predict arrythmia using GCNN but the problem i am facing is that the data is in tabular format screenshot attached below. Upon reading i found out that there needs to nodes and edges for it to work on GCNN. So, how can i convert into the graph data?

Topic graph-neural-network neural-network

Category Data Science

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