Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Partial Posterior Hyaloidectomy in Macular Surgery

This study has been completed.
Information provided by (Responsible Party):
Samsung Medical Center Identifier:
First received: October 17, 2011
Last updated: October 18, 2011
Last verified: October 2011
To evaluate the effect of partial posterior hyaloidectomy on preventing iatrogenic retinal breaks related to induction of a posterior vitreous detachment

Condition Intervention Phase
Retinal Break
Retinal Detachment
Procedure: Partial posterior hyaloidectomy (a modified procedure of vitrectomy)
Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Prevention
Official Title: Partial Posterior Hyaloidectomy in Macular Surgery : A Modified Procedure of Vitrectomy to Prevent Retinal Break Related to Induction of a Posterior Vitreous Detachment

Further study details as provided by Samsung Medical Center:

Primary Outcome Measures:
  • incidence of intraoperative and postoperative retinal break related to surgery [ Time Frame: postoperative 3 to 6 months ]
    The eyes that completed a follow-up of at least 3 months were included in the result analysis. The incidence of retinal breaks related to the surgery was measured.

Enrollment: 50
Study Start Date: November 2009
Study Completion Date: July 2011
Primary Completion Date: July 2011 (Final data collection date for primary outcome measure)
Intervention Details:
    Procedure: Partial posterior hyaloidectomy (a modified procedure of vitrectomy)
    The core vitrectomy entails more extensive removal of vitreous gel, in contrast to the conventional core vitrectomy. IPVD was conducted by engaging the attached posterior cortical vitreous with a 23-gauge needle with angulated tip in the area adjacent to the optic disc followed by gently moving the tip to approximately 3 disc diameters away from the margin of the optic disc. After then, slightly elevating the tip in a posteroanterior direction with slowly proceeding it to the extent that we planned. With IPVD, the surgeon was able to visualize a floating Weiss ring in all of the cases. Active suction to initiate IPVD was not used in any of the cases. In the temporal direction, the extension of a PVD was restricted to approximately 2 disc diameters distance beyond the margin of temporal major vascular arcade
Detailed Description:

The induction of a posterior vitreous detachment (IPVD) during vitrectomy have been suggested as one of the etiologies of iatrogenic retinal break related to vitrectomy.The iatrogenic retinal breaks related to IPVD usually develop near or anterior to the equatorial region.

Thus, the investigators hypothesized that this complication could be prevented by restricting the extent of IPVD, and planned a modified procedure of vitrectomy in which the extent of IPVD and removal of vitreous cortex was restricted to about slightly beyond the margin of temporal major vascular arcade.

The investigators have termed this procedure, partial posterior hyaloidectomy. Unlike RRD or proliferative diabetic retinopathy, lesions are localized within the major vascular arcade in macular disorders so that macular disorders could be an eligible indication for this procedure.


Ages Eligible for Study:   20 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Cases of idiopathic ERM or idiopathic MH without evidence of PVD preoperatively

Exclusion Criteria:

  • history of previous intraocular surgery
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01454466

Sponsors and Collaborators
Samsung Medical Center
Study Chair: Se Woong Kang, M.D. Samsung Medical Center
Principal Investigator: Jae Hui Kim, M.D. Samsung Medical Center
  More Information

Responsible Party: Samsung Medical Center Identifier: NCT01454466     History of Changes
Other Study ID Numbers: 2011-05-011
Study First Received: October 17, 2011
Last Updated: October 18, 2011

Keywords provided by Samsung Medical Center:
retinal break
partial posterior hyaloidectomy

Additional relevant MeSH terms:
Retinal Detachment
Vitreous Detachment
Retinal Perforations
Retinal Diseases
Eye Diseases processed this record on May 25, 2017