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Stent Compression in Iliac Vein Compression Syndrome Associated with Acute Ilio-Femoral Deep Vein Thrombosis.

Cho H, Kim JW, Hong YS, Lim SH, Won JH - Korean J Radiol (2015)

Bottom Line: The proportion of limbs showing significant stent compression was 33%.Fifty-six percent of limbs in the significant stent compression group developed stent occlusion.On the other hand, only 9% of limbs in the insignificant stent compression group developed stent occlusion.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Ajou University School of Medicine, Suwon 443-380, Korea.

ABSTRACT

Objective: This study was conducted to evaluate stent compression in iliac vein compression syndrome (IVCS) and to identify its association with stent patency.

Materials and methods: Between May 2005 and June 2014, after stent placement for the treatment of IVCS with acute ilio-femoral deep vein thrombosis, follow-up CT venography was performed in 48 patients (35 women, 13 men; age range 23-87 years; median age 56 years). Using follow-up CT venography, the degree of the stent compression was calculated and used to divide patients into two groups. Possible factors associated with stent compression and patency were evaluated. The cumulative degree of stent compression and patency rate were analyzed.

Results: All of the stents used were laser-cut nitinol stents. The proportion of limbs showing significant stent compression was 33%. Fifty-six percent of limbs in the significant stent compression group developed stent occlusion. On the other hand, only 9% of limbs in the insignificant stent compression group developed stent occlusion. Significant stent compression was inversely correlated with stent patency (p < 0.001). The median patency period evaluated with Kaplan-Meier analysis was 20.0 months for patients with significant stent compression. Other factors including gender, age, and type of stent were not correlated with stent patency. Significant stent compression occurred most frequently (87.5%) at the upper end of the stent (ilio-caval junction).

Conclusion: Significant compression of nitinol stents placed in IVCS highly affects stent patency. Therefore, in order to prevent stent compression in IVCS, nitinol stents with higher radial resistive force may be required.

No MeSH data available.


Related in: MedlinePlus

Kaplan-Meier curves show patency rates according to stent compression rate.Median patency period was 20.0 months for patients with significant stent compression (p = 0.001).
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Figure 2: Kaplan-Meier curves show patency rates according to stent compression rate.Median patency period was 20.0 months for patients with significant stent compression (p = 0.001).

Mentions: However, stent occlusion developed more frequently in the significant stent compression group than in the insignificant stent compression group (56%, 9/16 vs. 9%, 3/32, p < 0.001) (Table 1). Based on the cumulative patency rate in limbs with significant stent collapse, the median time to occlusion was 20 months (Fig. 2).


Stent Compression in Iliac Vein Compression Syndrome Associated with Acute Ilio-Femoral Deep Vein Thrombosis.

Cho H, Kim JW, Hong YS, Lim SH, Won JH - Korean J Radiol (2015)

Kaplan-Meier curves show patency rates according to stent compression rate.Median patency period was 20.0 months for patients with significant stent compression (p = 0.001).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4499535&req=5

Figure 2: Kaplan-Meier curves show patency rates according to stent compression rate.Median patency period was 20.0 months for patients with significant stent compression (p = 0.001).
Mentions: However, stent occlusion developed more frequently in the significant stent compression group than in the insignificant stent compression group (56%, 9/16 vs. 9%, 3/32, p < 0.001) (Table 1). Based on the cumulative patency rate in limbs with significant stent collapse, the median time to occlusion was 20 months (Fig. 2).

Bottom Line: The proportion of limbs showing significant stent compression was 33%.Fifty-six percent of limbs in the significant stent compression group developed stent occlusion.On the other hand, only 9% of limbs in the insignificant stent compression group developed stent occlusion.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Ajou University School of Medicine, Suwon 443-380, Korea.

ABSTRACT

Objective: This study was conducted to evaluate stent compression in iliac vein compression syndrome (IVCS) and to identify its association with stent patency.

Materials and methods: Between May 2005 and June 2014, after stent placement for the treatment of IVCS with acute ilio-femoral deep vein thrombosis, follow-up CT venography was performed in 48 patients (35 women, 13 men; age range 23-87 years; median age 56 years). Using follow-up CT venography, the degree of the stent compression was calculated and used to divide patients into two groups. Possible factors associated with stent compression and patency were evaluated. The cumulative degree of stent compression and patency rate were analyzed.

Results: All of the stents used were laser-cut nitinol stents. The proportion of limbs showing significant stent compression was 33%. Fifty-six percent of limbs in the significant stent compression group developed stent occlusion. On the other hand, only 9% of limbs in the insignificant stent compression group developed stent occlusion. Significant stent compression was inversely correlated with stent patency (p < 0.001). The median patency period evaluated with Kaplan-Meier analysis was 20.0 months for patients with significant stent compression. Other factors including gender, age, and type of stent were not correlated with stent patency. Significant stent compression occurred most frequently (87.5%) at the upper end of the stent (ilio-caval junction).

Conclusion: Significant compression of nitinol stents placed in IVCS highly affects stent patency. Therefore, in order to prevent stent compression in IVCS, nitinol stents with higher radial resistive force may be required.

No MeSH data available.


Related in: MedlinePlus