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Aortic distensibility abnormalities in coronary artery disease
Insights
Coronary artery disease (CAD) patients exhibit significantly reduced aortic distensibility compared to healthy individuals. This decreased elasticity in the aorta may be linked to atherosclerosis or impaired blood flow within the aortic wall.
Area of Science:
- Cardiovascular Physiology
- Vascular Biology
- Medical Imaging
Background:
- Atherosclerosis in animal models reduces arterial vasodilatory capacity.
- It is hypothesized that aortic distensibility may be impaired in patients with coronary artery disease (CAD).
Purpose of the Study:
- To investigate and compare aortic distensibility between patients with CAD and age-matched healthy subjects.
- To determine if CAD is associated with abnormal aortic elasticity.
Main Methods:
- Aortic distensibility was measured in 24 normotensive CAD patients with angiographically normal aortas and 18 healthy controls.
- Aortic diameters were assessed at three levels above the aortic valve using angiographic techniques.
- Distensibility was calculated using established formulas based on aortic diameter and pressure changes.
Main Results:
- CAD patients demonstrated significantly lower aortic distensibility across all measured levels compared to normal subjects (p < 0.02).
- Mean aortic distensibility was markedly reduced in CAD patients (1.6 +/- 0.1) versus controls (3.4 +/- 0.4, p < 0.001).
- Aortic pressures were similar between the groups, indicating distensibility as the primary difference.
Conclusions:
- Patients with coronary artery disease exhibit reduced aortic distensibility.
- This diminished elasticity may be a consequence of the underlying atherosclerotic process or reduced blood flow to the aorta's vasa vasorum.
Abstract:
Vasodilatory capacity of nonstenotic arteries in experimental animals with atherosclerosis is decreased. It was postulated that aortic distensibility may be abnormal in patients with coronary artery disease (CAD). Aortic distensibility was determined in 24 normotensive patients with CAD and an angiographically normal aorta and values were compared with those in 18 age-matched normal subjects. Aortic diameters were measured at 3 levels--2, 4 and 6 cm above the aortic valve--by angiographic techniques. The area of the first 6 cm of the aorta above the aortic valve was planimetered and mean aortic diameters were calculated. Distensibility was calculated using the formula: [2 X (changes of the aortic diameter)/(diastolic aortic diameter) X (changes of the aortic pressure)]. CAD patients had similar aortic pressures but markedly lower distensibility than normal subjects: 0.7 +/- 0.2 vs 1.7 +/- 0.3 (p less than 0.02); 1.5 +/- 0.3 vs 4.0 +/- 0.6 (p less than 0.02); and 1.2 +/- 0.2 vs 5.3 +/- 0.6 (p less than 0.001) at 2, 4 and 6 cm above the aortic valve, respectively. Distensibility was also calculated from the mean aortic diameters and was greater in normal subjects than in CAD patients (3.4 +/- 0.4 vs 1.6 +/- 0.1, p less than 0.001). Decreased aortic distensibility in CAD may be related to the common atherosclerotic process or to reduced ascending aorta vasa vasorum flow from coronary arteries.