Lens replacement for cataract: risks and a rare complication – UGH syndrome

What is Uveitis-Glaucoma-Hyphema (UGH) syndrome?

Cataract removal and intraocular lens (IOL) implantation surgery is one of the most frequently performed surgical procedures in ophthalmology, significantly improving the vision of millions of people. However, like any medical intervention, it carries certain, albeit rare, risks. One such rare complication is Uveitis-Glaucoma-Hyphema (UGH) syndrome.

UGH syndrome is a condition caused by mechanical friction between the intraocular lens and adjacent uveal structures of the eye, such as the iris and ciliary body [2]. This friction can lead to a triad of symptoms: uveitis (inflammation of the uveal tract), glaucoma (increased intraocular pressure), and hyphema (hemorrhage into the anterior chamber of the eye) [2].

The primary cause of UGH syndrome is often the incorrect position or fixation of the IOL. Specifically, asymmetric fixation of the haptics (supporting elements) of the intraocular lens or its inadvertent placement in the ciliary sulcus instead of the capsular bag can cause constant contact and mechanical irritation of the eye tissues [2]. This constant contact leads to inflammation, damage to blood vessels, and disruption of aqueous humor outflow, which causes the characteristic symptoms of UGH.

Symptoms and clinical presentation

Symptoms of UGH syndrome may not appear immediately after lens replacement surgery, but months or even years later. In the described clinical case, for example, an 80-year-old man developed progressive ocular hypertension approximately 30 months after a seemingly uncomplicated cataract surgery [2].

Key manifestations of UGH syndrome include:

• Progressive ocular hypertension: Increased intraocular pressure, which may be resistant to standard therapy [2].
• Hyphema: The appearance of blood in the anterior chamber of the eye, which may be noticeable as a red spot or a blood level, especially after physical exertion or in the morning [2].
• Vision loss: Deterioration of visual acuity caused by hemorrhage, inflammation, or increased intraocular pressure [2].

In the mentioned case, the patient initially received topical anti-glaucoma therapy, but it did not yield the desired effect, and after some time, he developed hyphema and further vision loss, which prompted a more in-depth examination [2].

Diagnosis of UGH syndrome

Accurate diagnosis of UGH syndrome requires a comprehensive approach and the use of specialized ophthalmic methods. In the clinical case described in the study, the diagnostic process included several stages [2]:

• Slit-lamp examination: A slit-lamp examination revealed moderate IOL decentration in the nasal direction [2]. This observation indicates a possible incorrect position of the lens, which may be the cause of mechanical friction.
• Gonioscopy: This method of examining the anterior chamber angle of the eye showed marked pigmentation in the inferior angle [2]. The pigmentation is the result of pigment release from the iris due to constant mechanical irritation by the IOL.
• Anterior Segment Optical Coherence Tomography (AS-OCT): AS-OCT proved to be a decisive tool for confirming the diagnosis. It demonstrated IOL tilt and direct contact between the posterior surface of the iris and the nasal haptic of the intraocular lens [2]. This method allows for the visualization of the exact position of the IOL and its interaction with surrounding structures in high detail, confirming the mechanical nature of the damage.

The combination of these methods allowed for the establishment of the exact mechanism of UGH syndrome development in the patient, which is key to choosing an effective treatment strategy [2].

Treatment approaches and results

Treatment of UGH syndrome is aimed at eliminating the cause of mechanical irritation and managing its consequences. In cases where conservative therapy, such as topical anti-glaucoma therapy, proves ineffective, surgical intervention is required [2].

In the described clinical case, after confirming the diagnosis of UGH syndrome, the patient underwent comprehensive surgical treatment, which included [2]:

• Repositioning of the displaced haptic: The main step was returning the displaced IOL haptic to the correct position — into the capsular bag. This eliminates the source of mechanical friction between the lens and uveal structures [2].
• Ahmed valve implantation: To control intraocular pressure, which was significantly elevated due to glaucoma, an Ahmed valve was implanted. This drainage device helps drain excess aqueous humor, lowering the pressure [2].
• Pars plana tube insertion: Additionally, a tube was inserted through the pars plana, which also contributes to the normalization of intraocular pressure and improvement of fluid outflow [2].

After the surgical intervention, the patient's condition improved significantly, which confirms the effectiveness of a mechanism-oriented approach to the diagnosis and treatment of UGH syndrome [2]. Eliminating mechanical irritation and normalizing intraocular pressure are key to restoring eye function and preventing further complications.

Importance of early diagnosis and specialized approach

The case of UGH syndrome caused by asymmetric fixation of an intraocular lens haptic highlights the importance of thorough postoperative follow-up and careful attention to any patient complaints after lens replacement surgery. Although UGH syndrome is a rare complication, its timely diagnosis and treatment are critical for preserving vision and preventing irreversible damage [2].

The clinical lesson learned from this case is the need to apply a mechanism-oriented approach to diagnosis and treatment. This means that for a successful outcome, it is important not just to treat the symptoms (glaucoma, hyphema), but to accurately identify the root cause – in this case, mechanical friction of the IOL [2]. The use of modern imaging methods, such as anterior segment OCT, allows for a detailed assessment of the IOL position and its interaction with surrounding tissues, which is the key to effective surgical planning and problem resolution [2].

Patients who have undergone lens replacement surgery should be informed about possible, albeit rare, complications and the need for immediate medical attention if symptoms such as vision loss, eye redness, pain, or increased intraocular pressure occur. Early detection and adequate treatment of UGH syndrome can significantly improve the prognosis and quality of life.

Sources

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The information provided in this article is for reference purposes only and cannot replace professional medical advice. Always consult a qualified specialist for diagnosis and treatment.