{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,2]],"date-time":"2025-11-02T16:29:00Z","timestamp":1762100940092},"reference-count":52,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2009,5,12]],"date-time":"2009-05-12T00:00:00Z","timestamp":1242086400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Diabetes Metabolism Res"],"published-print":{"date-parts":[[2009,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>To evaluate changes in pulse pressure (PP) and markers of cardiovascular autonomic neuropathy (CAN) according to duration of type 1 diabetes mellitus (T1DM).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This cross\u2010sectional controlled study evaluated 159 diabetic patients during a 3\u2010min posture test (standing\u2013squatting\u2013standing) with continuous measurement of systolic (SBP), diastolic (DBP) and mean (MBP) blood pressure by a Finapres device. Arterial stiffness was indirectly assessed by PP and the slope of PP as a function of MBP calculated during the whole 3\u2010min test. CAN was assessed by the expiration\/inspiration pulse interval ratio (E\/I R\u2010R ratio) during deep breathing and by three indices measured during the squatting test. Patients were divided into four groups according to diabetes duration (&lt;10 years, 11\u201320 years, 21\u201330 years and &gt; 30 years from group 1 to group 4, respectively) and compared with age\u2010matched non\u2010diabetic subjects.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>PP progressively increased (<jats:italic>p<\/jats:italic> &lt; 0.0001) and PP\/MBP decreased (<jats:italic>p<\/jats:italic> &lt; 0.0005) according to T1DM duration, whereas these parameters remained almost unchanged in age\u2010matched control subjects. E\/I ratio (<jats:italic>p<\/jats:italic> &lt; 0.0001) and baroreflex gain (<jats:italic>p<\/jats:italic> &lt; 0.0005) progressively decreased with T1DM duration. The parasympathetic index (squatting test vagal ratio\u2014SqTv) significantly increased (<jats:italic>p<\/jats:italic> &lt; 0.0001), whereas the sympathetic index (squatting test sympathetic ratio\u2014SqTs) only tended to decrease (<jats:italic>p<\/jats:italic> = 0.12) according to diabetes duration. No such changes in CAN indices were observed in the non\u2010diabetic population.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>PP increased according to T1DM duration in an age range where PP remained almost stable in controls, in agreement with accelerated arterial stiffening due to chronic hyperglycaemia. The baroreflex gain decreased and other indices of CAN also deteriorated with diabetes duration, more so indices reflecting parasympathetic rather than sympathetic dysfunction. 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