This visualization presents a hierarchical tree of patient medical records, with each top-level node representing an individual patient and a nested branch showing additional demographic and admission details. The tree layout is computed using D3.js v7’s `d3.tree()` and `d3.hierarchy()` APIs, with horizontal links drawn via `d3.linkHorizontal()` and rendered as SVG paths. Node circles are white with steel-blue strokes, and labels display patient names; the data is embedded directly in the script, including fields like age, blood type, medical condition, and admission dates. The visualization is styled with custom CSS for nodes and links.