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Published on: December 2, 2014
Relation between coronary artery disease, aortic stiffness, and left ventricular structure in a population sample
C D Gatzka1, J D Cameron, B A Kingwell
1From the Alfred and Baker Medical Unit, Alfred Hospital, and the Baker Medical Research Institute, Melbourne, Australia. cdg@ee.latrobe.edu.au
Insights
Newly diagnosed coronary artery disease (CAD) patients exhibit increased aortic stiffness and left ventricular mass. This finding may link higher pulse pressures to increased CAD mortality.
Area of Science:
- Cardiovascular Medicine
- Vascular Biology
- Cardiac Imaging
Background:
- Coronary artery disease (CAD) is a leading cause of mortality.
- Aortic stiffness and left ventricular structure are implicated in cardiovascular health.
- The relationship between early-stage CAD, aortic stiffness, and cardiac remodeling requires further elucidation.
Purpose of the Study:
- To investigate the association between newly diagnosed coronary artery disease (CAD) and aortic stiffness.
- To examine left ventricular structure in individuals with previously unknown CAD.
- To determine if increased aortic stiffness correlates with altered left ventricular mass in early CAD.
Main Methods:
- Recruitment of 55 patients with newly diagnosed CAD and 55 matched controls.
- Measurement of arterial blood pressure, transverse aortic systolic expansion, and left ventricular structure via echocardiography.
- Assessment of aortic stiffness using pressure-strain relationships and stiffness indices (Ep, beta).
Main Results:
- CAD patients demonstrated significantly higher aortic stiffness (higher brachial pulse pressure, Ep, and beta values) compared to controls.
- Mean arterial pressure was comparable between groups.
- Left ventricular mass index was significantly elevated in CAD patients versus controls.
- A majority of CAD patients (61%) presented with the highest quartile of aortic stiffness.
Conclusions:
- Individuals newly diagnosed with CAD exhibit increased aortic stiffness and left ventricular mass.
- Elevated aortic stiffness may be an early indicator or contributor to CAD development.
- These findings suggest a potential mechanism linking increased pulse pressure, aortic stiffness, and cardiovascular mortality in CAD.
Abstract:
To elucidate the relationship between coronary artery disease (CAD), aortic stiffness, and left ventricular structure, we recruited 55 subjects (33 men; average age, 63+/-1 years) with previously unknown CAD from a healthy general population sample, as well as 55 control subjects matched for gender, age, and serum cholesterol level. We measured arterial blood pressure and the systolic expansion of the transverse aorta and left ventricular structure by echocardiography. Aortic stiffness was higher in CAD patients than in controls, with a brachial pulse pressure of 59+/-3 versus 52+/-2 mm Hg and stiffness indices of Ep=212+/-26 versus 123+/-13 kN/m2 and beat=16+/-2 versus 9+/-1 (all P<0.01). Mean arterial pressure was similar in both groups during the measurements (95+/-2 versus 93+/-2 mm Hg, P=NS). Most CAD patients (61%) were in the highest stiffness quartile defined by the normal control values (P<0.05 versus control). Left ventricular mass index was also higher in CAD patients than in matched controls (139+/-5 versus 123+/-4 g/m2, P<0.05). We conclude that aortic stiffness and left ventricular mass are increased in subjects newly diagnosed as having CAD. This might explain previously reported associations of an increased mortality, particularly from CAD, found among subjects with elevated pulse pressures.
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