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The QKD interval is the time between the QRS wave on the electrocardiogram (ECG) and the detection of the last Korotkoff sound during BP measurement. Measurement of the QKD interval during ambulatory blood pressure (BP) monitoring provides an automatic evaluation of arterial stiffness. The objective of this longitudinal study was to examine the relationship between arterial stiffness assessed by this method and the occurrence of cardiovascular complications in a cohort of initially untreated hypertensive patients.

Arterial stiffness evaluated by measurement of the QKD interval is an independent predictor of cardiovascular events