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The QKd interval is the time between the onset of the QRS complex and detection of the last Korotkoff sound at the level of the humeral artery during indirect measurement of the blood pressure. This interval is dependant mainly on the pulse wave velocity. Measuring the QKd rather than pulse wave velocity has the advantage of being automatic, rapid, simple and reproducible. The QKd interval is significantly reduced in hypertensive patients compared to normotensive patients of the same age and is therefore a simple method for estimating their arterial distensibilty
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