Journal of the Medical Association of Thailand Vol 94, No 2:FEBUARY 2011 (SUPPL.1) 0125-2208 94 2 2011 Feb Comparison of Aortic Diameter in Normal Subjects and Patients with Systemic Hypertension 51 EN Decho Jakrapanichakul Srisakul Chirakarnjanakorn Original Article Aims of this study were 1) to determine the normal reference of aortic root dimension in Thai population and 2) todetermine the difference in the aortic root size in patients with hypertension comparing with normal population. We retrospectively reviewed 81 patients who had the transthoracic echocardiographic examinationsin our echocardiographic lab and had the aortic root measurement data. The patients with ascending aortic aneurysm, aorticdissection, aortic stenosis and/or regurgitation more than mild in degree, Marfan’s syndrome and annuloaortic ectasia wereexcluded. The echocardiographic data of were collected; the aortic root dimensions at four levels; aortic valve annulus, sinusof Valsava, sinotubular junction and tubular parts. Hypertension was indentified if the patient had the prior diagnosis ofhypertension and on antihypertensive medications, or who had blood pressure more than 140/90 mmHg for two or moreoccasions. Eighty-one patients were enrolled. Sixty patients (74.1%) were diagnosed hypertension. Mean age was 66.9 + 11.2years in hypertensive patients and 49.1 + 16.4 years in normotensive patients. Normal reference values based on 95% uppernormal limit of aortic valve annulus, sinus of Valsava, sinotubular junction and tubular part were 2.30 (2.21-2.38), 3.56(3.35-3.77), 2.79 (2.61-2.97), and 3.36 (3.13-3.59), respectively. Patients with hypertension had significant larger sinus ofValsava and tubular part of aortic root than patients with normotension. We reported a normal reference value for aortic root size in Thai population. The aortic root sizes are influencedby hypertensive status, age and gender. Aortic root diameter Hypertension Normal reference Echocardiography Sinus of Valsava Normotensive