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Point 1 represents the point at which the tricuspid regurgitation (TR) signal meets the 1 m/s velocity scale marker, while point 2 represents the point at which the TR signal meets the 2 m/s velocity scale marker. Point 3 represents the time required for the TR jet to increase from 1 to 2 m/s. In this example, this time is 30 ms, or 0.03 seconds. The dP/dt is therefore 12mm Hg/0.03 seconds, or 400 mm Hg/s.