Computed tomographic evaluation of angle and distance between superior mesenteric artery (SMA) and abdominal aorta in : Normal values in Iranian population according to different body mass index value
The primary purpose of present study is to “prove” that the angle and distance between the superior mesenteric artery (SMA) and aorta are significantly correlated with the body mass index (BMI). This in turn indicates the strong etiological role of this factor for the causation of SMA syndrome. The superior mesenteric artery syndrome is characterized by the compression of the third segment of the duodenum by the mesentery at superior mesenteric artery level and a resulting duodenal (±gastric) dilatation. The disease is closely related with the depletion of the fat pad between the vessels narrowing the angle and reducing the distance between the vessels. A prospective study of 300 patients (163 males and 137 females) in the age range of 40-70 years (mean age 51 years) who had undergone multislice detector CT scan in Alzahra Hospital for various other complaints in the year 1395. CT scans had been performed with routine protocol comprising of plain phase followed by arterial and venous phases to measure the angle between the aorta and superior mesenteric artery,BMI was also calculated. Mean values for distance and angle were obtained with P value of 5% and 95 % confidence intervals. Pearson coefficients and T test were also calculated and results were tabulated. A strong positive correlation was observed between BMI and the angle between the aorta and SMA. With increment in BMI, the angle also increases leading to a smaller chance of developing superior mesenteric artery syndrome.
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