2006
DOI: 10.1291/hypres.29.557
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Impairment of Instantaneous Autonomic Regulation Relates to Blood Pressure Fall Immediately after Standing in the Elderly and Hypertensives

Abstract: The relation between changes in blood pressure and changes in autonomic activity over a very short period of time has not been reported thus far. To examine this relation, we here introduced a new method of power spectrum analysis with wavelet transformation, which has very fine time resolution and is able to assess changes in autonomic activity quantitatively even during movement. Our subjects were 15 hypertensive and 17 normotensive subjects. A head-up tilt test was performed in all subjects, and during the … Show more

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Cited by 9 publications
(5 citation statements)
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“…This is in accordance with previous studies carried out in nonChagas disease patients, which demonstrated sympathetic derangement in elderly patients, mainly after head-up tilting [13]. However, our results contrast with those reported by de Rezende et al who did not find sympathetic impairment in elderly Chagas disease patients.…”
supporting
confidence: 88%
“…This is in accordance with previous studies carried out in nonChagas disease patients, which demonstrated sympathetic derangement in elderly patients, mainly after head-up tilting [13]. However, our results contrast with those reported by de Rezende et al who did not find sympathetic impairment in elderly Chagas disease patients.…”
supporting
confidence: 88%
“…This phenomenon occurs in 14-30% of the general population over the age of 65 years (27,38) and in 12-28% of all patients with diabetes mellitus (26,39). Diabetic autonomic neuropathy is the most common underlying mechanism in this condition (26), but impaired baroreflex sensitivity, hyporeninemia and intravascular hypovolemia also contribute to the abnormal postural decline in BP (28,40,41). In the present study no patient presented orthostatic hypotension (defined as a decrease in BP of at least 20 mmHg systolic or 10 mmHg diastolic within 3 min of standing up) (42).…”
Section: Discussionmentioning
confidence: 99%
“…Given the propensity of this type of population to develop orthostatic hypotension (26)(27)(28), special attention was focused on postural BP changes.…”
Section: Introductionmentioning
confidence: 99%
“…To overcome this deficit, in the present study we have used a different method of timefrequency domain analysis. The discrete wavelet transform has been shown by us (Postolache et al 2003(Postolache et al , 2004SilvaCarvalho et al 2006;Ducla-Soares et al 2006) and others (Mallat, 1998;Wiklund et al 2002;Mainardi et al 2002;van den Berg et al 2005, Urbancic-Rovan et al 2006Moriguchi et al 2006) to be applicable to cardiovascular signals. The four characteristic phases of VM are shown: phase I, an increase in blood pressure owing to the onset of the strain and a decrease in heart rate; phase II, a sharp decrease in blood pressure below baseline levels during the maintenance of the strain followed by an increase in pressure accompanied by an increase in heart rate; phase III, a short decrease in arterial pressure related to the release of the strain and an increase in heart rate; and phase IV, an overshoot of blood pressure and bradycardia.…”
Section: Figure 3 Wavelet Analysis Of Systolic Blood Pressure Changementioning
confidence: 98%