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Posterior capsular opacification after cataract surgery
Posterior capsular opacification (PCO) is the most common postoperative complication of contemporary cataract surgery. Is there a difference between diabetic and non-diabetic dogs? A very informative new study!

Limited information is available regarding PCO formation and factors that influence PCO development in the dog.

Two hundred sixty-five eyes (144 from diabetic dogs and 121 from dogs with breed-related cataracts) were prospectively evaluated for PCO formation for up to 12 months postoperatively.

The mean age of all dogs in the study was 7.77 years and diabetic dogs were significantly older than dogs with breed-related cataracts.

There were 73 males (61 neutered, 12 intact) and 74 females (70 neutered, 4 intact) in the study.

Statistical analysis was performed based on age, breed/size, gender, stage of cataract at the time of surgery, PCO score at each time point, breed-related vs. diabetic cataract, right eyes compared to left eyes, and presence/absence of uveitis.

Age and gender did not significantly influence PCO formation.

Small and medium-sized breeds developed significantly more PCO in comparison to the large/giant breeds at 2 weeks and 2–4 months postoperatively, but the differences were not significant at later time points.

There was an overall significant increase in PCO formation in eyes with early immature cataracts when compared to other stages of cataract up to 4 months postoperatively but not at later time points.

There were no statistical differences in PCO score at 6 months or at 1 year postoperatively in eyes with breed-related and diabetic cataracts. Right eyes did not differ from left eyes in PCO score.

PCO score significantly increased over time in breed-related and diabetic groups and in the overall population.

No difference was found in the degree of PCO formation in eyes with inflammation prior to or after surgery compared with those without inflammation.

In summary, age, gender, presence of inflammation, and cause of cataract (breed-related vs. diabetes mellitus) do not influence the development of PCO in canine cataract dogs.

Small and medium-sized breeds develop significant PCO earlier than larger breeds. It is important to note that all eyes from all dogs in this study developed PCO in a time dependent manner.



Source: Bras, I. Dineli, Colitz, Carmen M. H., Saville, William J. A., Gemensky-Metzler, Anne J. & Wilkie, David A. (2006): Posterior capsular opacification in diabetic and nondiabetic canine patients following cataract surgery. In: Veterinary Ophthalmology 9 (5), 317-327.




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