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Pathophysiology and pharmacology of intraocular surgery
Abstract:
Meticulous studies of the pathophysiology of postoperative eyes are mandatory to find the means of reducing the risks of intraocular surgery. Various methods of examination developed for this purpose are described and their clinical significance discussed. The corneal endothelium shows no proliferative capacity even after injury and great care must be taken to protect this vulnerable cell layer. Drugs may be toxic to the corneal endothelium and their use during surgery must be exercised with caution. The intraocular irrigating solutions must contain calcium and have an appropriate salt composition. Pupillary constriction that occurs during extracapsular cataract extraction is due mainly to prostaglandins synthesized as a result of surgical trauma; this can be prevented by the preoperative use of topical indomethacin. Breakdown of the blood-aqueous barrier after intraocular surgery may also be due to a similar mechanism, and preoperative topical non-steroidal anti-inflammatory agents (indomethacin, flurbiprofen and diclofenac) can prevent this phenomenon, as studied by fluorophotometry. Topical indomethacin also prevents cystoid macular oedema after cataract surgery. Based on the biochemical findings on inflammation after tissue injury, a protocol for the preoperative and postoperative use of corticosteroid and non-steroidal anti-inflammatory agents is proposed for anterior segment surgery.
Insights
Protecting the corneal endothelium and using anti-inflammatory drugs preoperatively can reduce risks in intraocular surgery. Topical indomethacin prevents pupillary constriction and cystoid macular edema following cataract procedures.
Area of Science:
- Ophthalmology
- Surgical Research
- Cell Biology
Background:
- Intraocular surgery carries risks that necessitate understanding postoperative eye pathophysiology.
- The corneal endothelium lacks proliferative capacity, making it vulnerable to surgical trauma and drug toxicity.
- Inflammation, mediated by prostaglandins, plays a significant role in postoperative complications.
Purpose of the Study:
- To investigate methods for reducing risks associated with intraocular surgery.
- To discuss the clinical significance of various examination methods for postoperative eyes.
- To propose a protocol for managing inflammation after anterior segment surgery.
Main Methods:
- Review of examination methods for assessing postoperative eye conditions.
- Analysis of drug toxicity on corneal endothelium.
- Evaluation of intraocular irrigating solution composition.
- Assessment of prostaglandin synthesis and its prevention using topical indomethacin.
- Fluorophotometry to study blood-aqueous barrier breakdown and the effect of non-steroidal anti-inflammatory agents (NSAIDs).
Main Results:
- Corneal endothelium requires careful protection due to its non-proliferative nature.
- Preoperative topical indomethacin effectively prevents pupillary constriction during extracapsular cataract extraction.
- Preoperative NSAIDs (indomethacin, flurbiprofen, diclofenac) prevent blood-aqueous barrier breakdown.
- Topical indomethacin is effective in preventing cystoid macular edema post-cataract surgery.
Conclusions:
- A comprehensive understanding of postoperative pathophysiology is crucial for mitigating surgical risks.
- Protecting the corneal endothelium and judicious use of drugs are paramount.
- A proposed protocol involves preoperative and postoperative use of corticosteroids and NSAIDs to manage inflammation in anterior segment surgery.