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Figure 1 .
Relation between arterial compliance, pulse wave velocity, and the aortic pressure waveform. (A) Normal arterial compliance and normal pulse wave velocity leading to a secondary wave in diastole caused by wave reflection. (B) Increased arterial stiffness, but normal pulse wave velocity leading to increased amplitude of pressure waveform. (C) Increased arterial stiffness and increased pulse wave velocity leading to increased pressure wave amplitude and a late systolic peak caused by early wave reflection with absence of a secondary wave in diastole (isolated systolic hypertension).