Abstract: Objective To investigate the clinical value of body mass index(BMI) in guiding femoral artery incision or puncture for aortic dissection. Methods From January 2020 to December 2020, 449 patients with aortic dissection were admitted to our hospital. Clinical data and imaging data were collected.The correlation between BMI and subcutaneous fat thickness at cross section under femoral artery branch and intra-femoral artery track was analyzed.Results There was a relatively strong positive correlation between BMI and bilateral femoral subcutaneous fat thickness,as the correlation coefficient was 0.654 on the left and 0.635 on the right.The results were statistically significant(P<0.05).The correlation between BMI and bilateral femoral artery diameter was very weak with the correlation coefficient 0.11 on the left side and 0.108 on the right side.The results were statistically significant(P<0.05). Conclusion There was a relatively strong correlation between BMI and bilateral femoral subcutaneous fat thickness.Thus,BMI can act as an important reference for intraoperative femoral artery incision or puncture,that suitable for predicting femoral artery depth in patients who suffer aortic dissection.

Key words: aortic dissection, body mass index, diameter of femoral artery, subcutaneous fat thickness