Obstruction of the lacrimal system: Treatment with a covered, retrievable, expandable nitinol stent versus a lacrimal polyurethane stent

Gi Young Ko, Ho Young Song, Tae-Seok Seo, Tae Hyung Kim, Kyu Bo Sung, Hyun Ki Yoon

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

PURPOSE: To compare the clinical effectiveness of a covered nitinol stent with that of a polyurethane stent for treatment of lacrimal system obstructions. MATERIALS AND METHODS: A nitinol stent was knit from a single thread of 0.1 -mm nitinol wire in a tubular configuration and was covered by dipping the stent into a polyurethane solution. The stent was 4 mm in diameter and 30 or 35 mm long. With fluoroscopic guidance, a covered nitinol stent (n = 33, group A) or a polyurethane stent (n = 35, group B) was placed in 68 patients. The following items were evaluated retrospectively: technical success, procedure time, cumulative patency rate, and complications. An unpaired Student t test was used to analyze the difference between the procedure times. Kaplan-Meier survival curves and a logrank test were used to compare the cumulative patency rates. RESULTS: Stent placement was technically successful in 31 (94%) of 33 patients in group A and in all 35 (100%) patients in group B. After stent placement, all patients showed resolution of epiphora. Average procedure time was 400 seconds (range, 270-900 seconds) in group A and 260 seconds (range, 150-900 seconds) in group B. The difference between the procedure times was statistically significant (P = .0003). During the mean follow-up period of 40 months, there was recurrence of epiphora in 30 of 31 patients in group A and 26 of 35 patients in group B. The difference of the cumulative patency rates was statistically insignificant (P = .2). CONCLUSION: Although the polyurethane stent used for treatment seemed to be more effective than the nitinol stent, selection of these stents for placement should be made with caution, because the long-term patency rates are not encouraging.

Original languageEnglish
Pages (from-to)270-276
Number of pages7
JournalRadiology
Volume227
Issue number1
DOIs
Publication statusPublished - 2003 Apr 1
Externally publishedYes

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Polyurethanes
Tears
Stents
Therapeutics
Lacrimal Apparatus Diseases
nitinol
Kaplan-Meier Estimate

Keywords

  • Lacrimal gland and duct
  • Lacrimal gland and duct, interventional procedures
  • Stents and prostheses

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Obstruction of the lacrimal system : Treatment with a covered, retrievable, expandable nitinol stent versus a lacrimal polyurethane stent. / Ko, Gi Young; Song, Ho Young; Seo, Tae-Seok; Kim, Tae Hyung; Sung, Kyu Bo; Yoon, Hyun Ki.

In: Radiology, Vol. 227, No. 1, 01.04.2003, p. 270-276.

Research output: Contribution to journalArticle

Ko, Gi Young ; Song, Ho Young ; Seo, Tae-Seok ; Kim, Tae Hyung ; Sung, Kyu Bo ; Yoon, Hyun Ki. / Obstruction of the lacrimal system : Treatment with a covered, retrievable, expandable nitinol stent versus a lacrimal polyurethane stent. In: Radiology. 2003 ; Vol. 227, No. 1. pp. 270-276.
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abstract = "PURPOSE: To compare the clinical effectiveness of a covered nitinol stent with that of a polyurethane stent for treatment of lacrimal system obstructions. MATERIALS AND METHODS: A nitinol stent was knit from a single thread of 0.1 -mm nitinol wire in a tubular configuration and was covered by dipping the stent into a polyurethane solution. The stent was 4 mm in diameter and 30 or 35 mm long. With fluoroscopic guidance, a covered nitinol stent (n = 33, group A) or a polyurethane stent (n = 35, group B) was placed in 68 patients. The following items were evaluated retrospectively: technical success, procedure time, cumulative patency rate, and complications. An unpaired Student t test was used to analyze the difference between the procedure times. Kaplan-Meier survival curves and a logrank test were used to compare the cumulative patency rates. RESULTS: Stent placement was technically successful in 31 (94{\%}) of 33 patients in group A and in all 35 (100{\%}) patients in group B. After stent placement, all patients showed resolution of epiphora. Average procedure time was 400 seconds (range, 270-900 seconds) in group A and 260 seconds (range, 150-900 seconds) in group B. The difference between the procedure times was statistically significant (P = .0003). During the mean follow-up period of 40 months, there was recurrence of epiphora in 30 of 31 patients in group A and 26 of 35 patients in group B. The difference of the cumulative patency rates was statistically insignificant (P = .2). CONCLUSION: Although the polyurethane stent used for treatment seemed to be more effective than the nitinol stent, selection of these stents for placement should be made with caution, because the long-term patency rates are not encouraging.",
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T2 - Treatment with a covered, retrievable, expandable nitinol stent versus a lacrimal polyurethane stent

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AU - Song, Ho Young

AU - Seo, Tae-Seok

AU - Kim, Tae Hyung

AU - Sung, Kyu Bo

AU - Yoon, Hyun Ki

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N2 - PURPOSE: To compare the clinical effectiveness of a covered nitinol stent with that of a polyurethane stent for treatment of lacrimal system obstructions. MATERIALS AND METHODS: A nitinol stent was knit from a single thread of 0.1 -mm nitinol wire in a tubular configuration and was covered by dipping the stent into a polyurethane solution. The stent was 4 mm in diameter and 30 or 35 mm long. With fluoroscopic guidance, a covered nitinol stent (n = 33, group A) or a polyurethane stent (n = 35, group B) was placed in 68 patients. The following items were evaluated retrospectively: technical success, procedure time, cumulative patency rate, and complications. An unpaired Student t test was used to analyze the difference between the procedure times. Kaplan-Meier survival curves and a logrank test were used to compare the cumulative patency rates. RESULTS: Stent placement was technically successful in 31 (94%) of 33 patients in group A and in all 35 (100%) patients in group B. After stent placement, all patients showed resolution of epiphora. Average procedure time was 400 seconds (range, 270-900 seconds) in group A and 260 seconds (range, 150-900 seconds) in group B. The difference between the procedure times was statistically significant (P = .0003). During the mean follow-up period of 40 months, there was recurrence of epiphora in 30 of 31 patients in group A and 26 of 35 patients in group B. The difference of the cumulative patency rates was statistically insignificant (P = .2). CONCLUSION: Although the polyurethane stent used for treatment seemed to be more effective than the nitinol stent, selection of these stents for placement should be made with caution, because the long-term patency rates are not encouraging.

AB - PURPOSE: To compare the clinical effectiveness of a covered nitinol stent with that of a polyurethane stent for treatment of lacrimal system obstructions. MATERIALS AND METHODS: A nitinol stent was knit from a single thread of 0.1 -mm nitinol wire in a tubular configuration and was covered by dipping the stent into a polyurethane solution. The stent was 4 mm in diameter and 30 or 35 mm long. With fluoroscopic guidance, a covered nitinol stent (n = 33, group A) or a polyurethane stent (n = 35, group B) was placed in 68 patients. The following items were evaluated retrospectively: technical success, procedure time, cumulative patency rate, and complications. An unpaired Student t test was used to analyze the difference between the procedure times. Kaplan-Meier survival curves and a logrank test were used to compare the cumulative patency rates. RESULTS: Stent placement was technically successful in 31 (94%) of 33 patients in group A and in all 35 (100%) patients in group B. After stent placement, all patients showed resolution of epiphora. Average procedure time was 400 seconds (range, 270-900 seconds) in group A and 260 seconds (range, 150-900 seconds) in group B. The difference between the procedure times was statistically significant (P = .0003). During the mean follow-up period of 40 months, there was recurrence of epiphora in 30 of 31 patients in group A and 26 of 35 patients in group B. The difference of the cumulative patency rates was statistically insignificant (P = .2). CONCLUSION: Although the polyurethane stent used for treatment seemed to be more effective than the nitinol stent, selection of these stents for placement should be made with caution, because the long-term patency rates are not encouraging.

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