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Computer analysis of blood pressure and heart rate variability has been recently proposed as a new method to obtain quantitative information on neural control of circulation and, specifically, on the sensitivity of the baroreceptor-heart rate reflex. This approach is particularly appealing because it allows a dynamic assessment of baroreflex gain in daily life conditions, thus overcoming several drawbacks of traditional laboratory procedures. In this chapter techniques developed to this aim both in the time and in the frequency domain will be briefly described, discussing their advantages and limitations. Examples of the results obtained by using them to analyse 24 hour ambulatory blood pressure and heart rate recordings in normal subjects and in hypertensive patients of different ages will also be shown. Finally, perspectives for further technical improvement of these methods will be mentioned.
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