Peripheral pulse pressure responses to postural stress do not reflect those at the carotid artery

Steinback, Craig D.; O’Leary, Deborah D.; Wang, Simon S.; Shoemaker, J. Kevin

doi:10.1046/j.1475-0961.2003.00527.x

Cited by 9 publications

(11 citation statements)

References 23 publications

(34 reference statements)

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“…Indeed, we found no significant variation in brachial blood pressure values when we switched the subjects in our study from a supine to orthostatic position. Noticeably, these findings are in agreement with data from other sources that demonstrated that carotid pulse pressure did not change in response to postural variation (25). Although slight differences in the absolute values cannot be excluded, these results suggest that there might be a strong correlation between brachial and carotid blood pressure in response to postural stress.…”

Section: Discussionsupporting

confidence: 92%

Postural Changes May Influence Popliteal Atherosclerosis by Modifying Local Circumferential Wall Tension

et al. 2008

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Section: Discussionsupporting

confidence: 92%

Postural Changes May Influence Popliteal Atherosclerosis by Modifying Local Circumferential Wall Tension

et al. 2008

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“…Second, pulse pressure was measured at the finger site. However, pulse pressure changes in radial artery and finger were almost similar during a head-up tilt (28). Finally, type 1 diabetic patients were not well controlled, precluding any extrapolation to type 1 diabetic patients with excellent glucose control.…”

Section: Resultsmentioning

confidence: 99%

Squatting Amplifies Pulse Pressure Increase With Disease Duration in Patients With Type 1 Diabetes

2008

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OBJECTIVE -To evaluate pulse pressure changes according to duration of type 1 diabetes and to assess the influence of posture.RESEARCH DESIGN AND METHODS -We performed continuous measurement of blood pressure with a Finapres device during a 3 ϫ 1 min posture test (standing, squatting, standing) in 159 type 1 diabetic patients divided into four groups according to diabetes duration (Յ10, 11-20, 21-30, and Ͼ30 years, groups 1-4, respectively) and compared the results with those of age-matched nondiabetic subjects.RESULTS -Pulse pressure progressively increased according to type 1 diabetes duration (P Ͻ 0.0001), especially in women, but not in age-matched nondiabetic subjects (NS). Pulsepressure increase from group 1 to group 4 was amplified in the squatting position (from 50 Ϯ 17 to 69 Ϯ 14 mmHg) compared with standing (from 44 Ϯ 15 to 55 Ϯ 12 mmHg).CONCLUSIONS -Pulse pressure increases according to type 1 diabetes duration more in women than in men, and the squatting position sensitizes such pulse-pressure increase in both sexes.

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“…Pulstatile forearm blood flow (FBF) was calculated as FBF = blood velocity × r 2 , where r is the brachial artery radius. The tonometric blood pressure waveforms from the Millar tonometer (Millar Instruments), previously validated in our hands (Steinback et al 2004), were corrected for measured diastolic pressure. During the LBNP and CPT experiments, brachial artery pressure waveforms were derived from the Finometer device (Finapres Medical Systems, Amsterdam, The Netherlands) that obtains pulsatile pressure from a cuff placed around the middle finger.…”

Section: Data Acquisitionmentioning

confidence: 99%

Role of vascular bed compliance in vasomotor control in human skeletal muscle

Zamir¹,

Goswami²,

Salzer³

et al. 2007

Experimental Physiology

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The current view of neurogenic vasomotor control in skeletal muscle is based largely on changes in vascular bed resistance. The purpose of this study was to determine to what extent vascular bed compliance may also play a role in this regulation. For this purpose, pressure waveforms (Millar and Finometer) and flow waveforms (Doppler ultrasound) were measured simultaneously in the brachial artery of seven healthy individuals during physiological manoeuvres which were expected to produce non-neurogenic changes in resistance (wrist-cuff occlusion; n = 5) or compliance (arm elevation; n = 6) of the forearm vascular bed. Vascular resistance (R) was calculated from the average flow and pressure values. A lumped Windkessel model was used to obtain vascular bed compliance (C) from these concurrently measured waveforms. Compared with baseline (3.81 ± 1.59 ml min −1 mmHg −1 ), wrist occlusion increased R (65 ± 75%; P < 0.05) with minimal change in C (−15 ± 16%; n.s.). Compared with the arm in neutral position (0.0075 ± 0.003 ml mmHg −1 ), elevation of the arm above heart level produced a 86 ± 41% increase in C (P < 0.05) with little change in R (−5 ± 11%). In addition, neurogenic changes were assessed during lower body negative pressure (LBNP) and a cold pressor test (CPT; n = 7). Lower body negative pressure induced a 29 ± 24% increase in R and a 26 ± 12% decrease in C (both P < 0.05). The CPT induced no consistent change in R but a 22 ± 7% reduction in C (P < 0.05). It was concluded that vascular bed compliance is an independent variable which should be considered along with vascular bed resistance in the mechanics of vasomotor regulation in skeletal muscle.

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Peripheral pulse pressure responses to postural stress do not reflect those at the carotid artery

Cited by 9 publications

References 23 publications

Postural Changes May Influence Popliteal Atherosclerosis by Modifying Local Circumferential Wall Tension

Postural Changes May Influence Popliteal Atherosclerosis by Modifying Local Circumferential Wall Tension

Squatting Amplifies Pulse Pressure Increase With Disease Duration in Patients With Type 1 Diabetes

Role of vascular bed compliance in vasomotor control in human skeletal muscle

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