Comparative Analysis Of AVmax, ABI And SPI Arfter Femoral Artery Occlusion Stenting

ObjectiveTo compare the AVmax, ABI and SPI and analysis the feasibility of ABI and SPI in the assessment of recanalization after superficial femoral artery stenting.Material and MethodsClinical data was collected from the department of interventional radiology in our hospital from January 2009 to January 2010.36 patients(male 28 cases, female 8 cases; age from 38-89 years, mean 67±12 years; smoking 12 cases, hypertension 18 cases, hyperlipidemia 5 cases, diabetes 12 cases, arteritis 2 cases) diagnosed as superficial femoral artery stenosis/occlusion by the examinations of lower extremity color Doppler Ultrasound, DSA, SPI and ABI, were enrolled in this study. The AVmax, ABI and SPI before-and-after stenting were compared, SPSS was used to analysis the correlations and the differences of the AVmax, ABI and SPI before-and-after stenting in order to detect whether their differences were significant.ResultsNon-parametric Spearman analysis was used to analyze the correlations between the AVmax, ABI and SPI and the stenosis degree before stenting separately, the results were as follows:the AVmax had a negative correlation to the stenosis degree, the correlation coefficient:-0.95 (significance level of 0.01); the ABI had a negative correlation to the stenosis degree, the correlation coefficient:-0.70(significance level of 0.01); the SPI had a negative correlation to the stenosis degree, the correlation coefficient:-0.91 (significance level of 0.01). Paired-sample T test was used to analyze the differences before-and-after stenting, the results were as follows:the AVmax before stenting was (0.24±0.22)m/s, after was (1.02±0.15) m/s, artery velocity average increase was (0.78±0.17) m/s, the 95% CI (confidence interval) was (0.72～0.84) m/s, t=26.92, P<0.01; the ABI before stenting was (0.46±0.15), after was (0.64±0.20), average increase was (0.18±0.08), the 95% CI was (0.72～0.84), t=13.00, P<0.01; the SPI before stenting was (0.76±0.23), after was(1.13±0.15), average increase was (0.38±0.15), the 95% CI was (0.32～0.43), t=14.91, P<0.01.ConclusionThe AVmax, ABI and SPI all were showed negative correlations to the stenosis degree before stenting and had good correlations. These three examinations could be used before stenting to evaluate and select the candidate. The differences of the AVmax, ABI and SPI before-and-after stenting were significant, these examinations could be used to assessment the recanalization after stenting and during the follow-up period. The SPI was better than ABI in the correlation of stenosis degree.