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Studies of the vessel wall properties in hemodialysis patients
M Barenbrock1, C Spieker, V Laske
1Department of Medicine D, University of Münster, Germany.
Insights
Arterial stiffness, measured by carotid artery distensibility, is reduced in younger hemodialysis patients. This arterial stiffening is independent of fluid status changes during dialysis.
Area of Science:
- Cardiovascular Physiology
- Vascular Biology
- Nephrology
Background:
- Arterial compliance is crucial for cardiovascular function.
- Abnormalities in arterial compliance can significantly impact cardiovascular health.
- Hemodialysis patients often exhibit altered cardiovascular properties.
Purpose of the Study:
- To investigate the elastic properties of the common carotid artery in hemodialysis patients.
- To compare arterial distensibility between hemodialysis patients and healthy controls.
- To determine if fluid status affects arterial distensibility in hemodialysis patients.
Main Methods:
- Noninvasive assessment of common carotid artery elastic properties.
- Doppler analysis to measure arterial distension and vessel wall movements.
- Finger-plethysmography (Finapres) for blood pressure monitoring.
Main Results:
- Younger hemodialysis patients showed significantly reduced vessel wall distensibility and increased end-diastolic diameter compared to controls.
- Older hemodialysis patients did not exhibit significant differences in distensibility or diameter compared to age-matched controls.
- Ultrafiltration during hemodialysis did not significantly alter arterial distensibility, suggesting fluid status is not the primary cause.
Conclusions:
- Common carotid artery distensibility is decreased in younger hemodialysis patients.
- The observed decrease in arterial distensibility is not attributable to volume expansion in hemodialysis patients.
- These findings highlight potential vascular alterations in younger hemodialysis patients.
Abstract:
Compliance is an important property of the arterial system and abnormalities in compliance can greatly affect cardiovascular function. The elastic properties of the common carotid artery were therefore studied in 24 normotensive hemodialysis patients and 24 healthy normotensives using a noninvasive technique. The hemodialysis patients and the control subjects were matched for blood pressure. Arterial distension was measured by Doppler analysis of the vessel wall movements and blood pressure was recorded by finger-phlethysmography (Finapres). The vessel wall distensibility (DC: 2.49 +/- 0.23 10(-3)/mm Hg; mean +/- SEM) was significantly reduced and the end diastolic diameter (d: 7.3 +/- 0.3 mm) was significantly increased in younger hemodialysis patients (36.3 +/- 2.0 years) when compared with age-related controls (DC: 3.44 +/- 0.24 10(-3)/mm Hg; d: 6.3 +/- 0.3 mm; mean +/- SEM). In older hemodialysis patients (60.2 +/- 2.3 years), there was no significant difference in vessel wall distensibility (DC: 1.55 +/- 0.15 10(-3)/mm Hg) and vessel diameter (d: 7.8 +/- 0.3 mm) as compared with age-matched controls (DC: 1.77 +/- 0.14 10(-3)/mm Hg; d: 7.2 +/- 0.3 mm). The results show that vessel wall distensibility of the common carotid artery is decreased in younger hemodialysis patients as compared with age-matched healthy subjects. The volume expanded state in hemodialysis patients cannot account for the decreased arterial distensibility, since volume depletion by hemodialysis was not associated with a significant change of arterial distensibility (DC 2.14 +/- 0.44 10(-3)/mm Hg before, DC 2.26 +/- 0.45 10(-3)/mm Hg after ultrafiltration, NS).(ABSTRACT TRUNCATED AT 250 WORDS)