Tuesday, February 19, 2013

2/15/13 Case Summary

We discussed Cases 1 and 2 during a webinar last Friday. The presentation is saved at:
Some of the audio is involved with the formatting and use of smartphones and tablets to answer the questions.

Summary of Case 1:

The patient has a sensory extropia secondary to traumatic optic neuropathy and correction can involve right lateral rectus recession and right medial rectus resection. Patients with one poor-seeing eye usually prefer to have surgery on that eye, and usually that is feasible.

There are some cases where the plan with the higher likelihood of success involves operating on the better seeing eye. In those cases, I try to explain to patient (or parent) how their goals are more likely to be achieved with surgery on the sound eye, and what to expect if surgery is only performed on the unsound eye. If they decide to only operate on the poor eye, then I operate on that eye only.

Summary of Case 2:

An intermittent hypertropia implies an early onset, which can be important when evaluating a patient with a "new" vertical deviation- if they are fusing a hypertropia >5PD, it's probably not an acute process.

The management of 4th nerve palsy with or without inferior oblique overaction has a number of options, determined by assessment of versions, torsion, head osition, and patient age. A general rule of strabismus surgery planning is to operate on the muscles with a field of action on the direction where the deviation is greatest. In this case, the left hypertropia is worse in right gaze, so the options are to work on the vertical recti of the right eye, or the obliques of the left eye.

Left inferior oblique myotomy/recession would correct the inferior oblique overaction and up to 12-15PD of hypertropia. It will have a modest incyclorsion. I've found a myotomy works well in children, but may leave residual deviations in adults. Myotomy is not adjustable; recession can be adjusted.

Left superior oblique tuck will improve the ability to depress in adduction, so can be considered in cases with moderate to severe superior oblique underaction. It will result in a large incyclorotation and may cause a Brown syndrome if the tuck is too tight. A tuck is not easily adjusted.

Left superior oblique Harada-Ito can cause a moderate to large incyclotorsion with minimal effect on vertical alignment. The procedure can be used as a solitary procedure for isolated torsion, or combined with other vertical muscle surgery. The Harada-Ito can be adjusted.

Right inferior rectus recession works well in adults and is easily adjusted. It can result in a moderate incyclotorsion, especially if it is displaced nasally. Inferior rectus recession should be avoided if there is minimal (or no) hypertropia in downgaze, as it may cause the hypertropia to "flip" in downgaze with difficulty reading post-operatively.

Tuesday, February 12, 2013

2/15/13 Cases

Here are two cases that we will be discussing during a webinar session 2/15/13. Both cases have had surgery for their strabismus. Your assignment is to review the clinical history and images, develop a surgical plan, and post your plan and reasoning in the comments section. You don't need to worry about specific surgical dosages, but should indicate which muscle you plan to work on, and whether you will weaken, strengthen, transpose, or otherwise modify the muscle.

I will moderate the comments and "publish" them after our session with a summary of our discussion. Please separate your comments into Case 1 and Case 2.

Case 1:
5y/o boy, history of shaken baby syndrome and optic atrophy OD>OS.
Va 20/200 OD, 20/40 OS. + RAPD OD
20ft: XT 40
13in: XT 35
Strongly prefers fixing with OS. Full versions. Mom wants his right eye to be straight before he enters kindergarten.

Representative image from healthinset.com


Q1.1 What is your surgical plan?

 Case 2:

7y/o girl brought in by mother because "eyes look funny". No prior injuries or surgery. Mom notes that patient has always tilted her head to the right.
Va 20/20 OU
Rotations: 2-3+ LIOOA
Primary: LH(T) 12
R gaze: LHT 15; L gaze: LHT 4
Down: LHT 6

L gaze
Q2.1 What measurements would you expect on head tilt to the right and left?
Q2.2 What would you expect with double Maddox rod testing?
Q2.3 What is your surgical plan?

Sunday, February 10, 2013


This is going to be the home of our monthly strabismus rounds- a place to post photos and videos of patients to allow discussion of their surgical management.

I'll plan on posting brief clinical histories along with images for your review prior to our live webinars with faculty.

Expect 3-5 cases per month. Your goal is to review the cases, develop a reasonable surgical plan, and post your discussion of the case in the comments thread prior to the didactic session. It will probably be most helpful for your learning to come up with a plan on your own before reading through the comments section.

This is my first blogging experience, so feel free to offer comments on format, tips on how the presentations can be improved, or any other ideas on how to make the course more useful for you.