This interactive line chart visualizes a patient's diastolic pressure over time, using a red line and a semi-transparent area to encode the data. The visualization, built with D3 v5, supports zooming and panning through a brush interface. A tooltip displays the exact date, name, and value of a data point upon mouse movement. The chart’s axes and interaction are rendered as SVG, with data loaded from a CSV file, allowing viewers to explore the temporal trends in this single vital sign.