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Published on: May 3, 2018
Estimation of central pressure augmentation using automated radial artery tonometry
Vojtech Melenovsky1, Barry A Borlaug, Barry Fetics
1Department of Cardiology, IKEM, Prague, Czech Republic.
Journal of Hypertension
|June 15, 2007
Summary
Automated radial analysis of augmentation index (AI) offers a practical alternative to carotid tonometry for assessing central blood pressure augmentation. This method shows promise for clinical trials and individual cardiac risk stratification.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Clinical Diagnostics
Background:
- Peripheral wave reflection increases central blood pressure, impacting cardiac load.
- Augmentation index (AI) quantifies this pressure augmentation but is difficult to measure from the carotid artery.
- Carotid tonometry is challenging to standardize, necessitating alternative methods.
Purpose of the Study:
- To evaluate automated radial pressure analysis as a viable alternative to carotid tonometry for measuring AI.
- To assess the correlation between radial AI (rAI) and carotid AI (cAI).
- To determine if rAI can accurately predict cardiac load based on AI thresholds.
Main Methods:
- Measured carotid AI (cAI) and radial AI (rAI) in 46 volunteers.
- Assessed AI at rest, during a cold-pressor test, and after nitroglycerin administration.
- Correlated cAI and rAI with each other and with cardiac load indices.
Main Results:
- cAI and rAI showed strong correlation (r=0.81) independent of demographic and hemodynamic factors.
- Changes in rAI and cAI during provocative maneuvers also correlated significantly (r=0.77).
- rAI accurately predicted the threshold where increased AI is associated with greater cardiac load (88% accuracy).
Conclusions:
- Automated radial AI analysis is a simple and effective method for assessing central pressure augmentation.
- rAI shows consistency in population studies and is suitable for clinical trials.
- rAI can help stratify individual cardiac risk by predicting increased left ventricular loading.
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The Brachial Artery: Primary Site for Blood Pressure Measurement
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01:30Equipments Used To Measure Blood Pressure
Direct Method
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Prepare for the Procedure:
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Monitoring Both Arms:
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