Abstract
As the alteration in an aortic root function or morphology may have influences on the coronary circulation, the pathological and clinical study of the aortic root plays a great role in evaluation of ischemic heart disease. So the blood pressures and the human aortic root diameters (Ro) were clinically measured by using the UCG technique in 85 cases, and then the elastances (Ep) were calculated. The mean Ep in 85 cases was 1.6×106 dyn/cm2. This value coincided with that reported by Peterson et al. (1960), which were obtained from any kinds of arteries in dogs.The Ros and the Eps of both the patients with and without ischemic heart disease, which was diagnosed electrocardiographically, showed the same mean values.In hypertensive patients, the Ros and the Eps were significantly larger than those in normotensive patients. There were seen some young hypertensive patients whose Ros were significant greater as expected their age, but had the normal Eps. The Ros and the Eps in patients with the aortic calcification seen in the chest X-ray film were relatively larger than in patients without the calcification. These results suggested that the Ros and the Eps were influenced by high blood pressure and the age. However, other facters, such as aortic sclerotic changes, myocardial fibrosis, myocardial ischemia and cardiac dysfunction would relate to the diameter and elastance of the aorta.
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