Trends in ophthalmic manifestations of methicillin-resistant Staphylococcus aureus (MRSA) in a northern California pediatric population.

PURPOSE: To determine pediatric clinical trends of ocular and periocular methicillin-resistant Staphylococcus aureus (MRSA) in a large northern California healthcare system. METHODS: This study was a retrospective cross-sectional review of all pediatric cases (aged 0-18) with culture-positive ophthalmic MRSA isolates identified between January 2002 and December 2009. Medical record review included history, presentation, infection site, acquisition (community or nosocomial), antibiotic sensitivity/resistance, treatment, and clinical outcome. Incidence was classified by year, sex, and age. Parameters were analyzed for statistical significance by trend and χ(2) analysis. RESULTS: A total of 399 ocular and periocular MRSA cases were included. Cases trended upward from 2002 to 2009, peaking in 2006. Of the 137 pediatric cases (0-18 years), 58% were community acquired. Conjunctivitis was the predominant presentation (40%), followed by stye/chalazion (25%), orbital cellulitis/abscess (19%), dacryocystitis (11%) and brow abscess (3%). Significant predictors for ocular infection with MRSA included male sex (61%), neonates (38%), and multiple infection sites on the body (38%). Resistance was high to bacitracin (80.9%) and ofloxacin (48.3%) but remained low for trimethoprim/sulfamethoxazole (8.7%). Topical therapy was effective in 29% of cases; oral antibiotics, in 47%. Intravenous therapy was required in 12% of cases and incision/drainage or surgery in 19%. Initial oral antibiotic treatment, primarily cephalosporins (24%), was ineffective in 37% of patients. There was a significant increase in resistance to antibiotic therapy (P < 0.001) during the study period. No patients developed permanent visual impairment. CONCLUSIONS: Pediatric ocular and periocular MRSA is increasing in incidence and resistance in our patient population. Outcomes can be improved by early recognition, proper antibiotic selection, and obtaining cultures and sensitivities when resistant or severe ocular infections are present.

Young patients with branch retinal vein occlusion: a review of 60 cases.

PURPOSE: To investigate the risk factors for branch retinal vein occlusion (BRVO) in young patients. METHODS: Observational case series with retrospective comparative controls. The medical records of 60 consecutive patients (aged ≤ 49 years) with BRVO were reviewed to note patients' age, sex, body mass index, history of smoking, diabetes, hypertension, hyperlipidemia, and hormonal replacement therapy in women. Results were compared with those of a control group of 123 individuals. RESULTS: An increased risk of BRVO was found in patients with a history of systemic hypertension, hyperlipidemia, and increased body mass index but not with diabetes, smoking, or hormone replacement therapy. CONCLUSION: Systemic hypertension, hyperlipidemia, and increased body mass index are important risk factors for BRVO in young patients, just as in the older population. We recommend obtaining a complete blood count, reviewing the medical history, and evaluating the patient for systemic hypertension, obesity, and hyperlipidemia as part of the initial workup of young patients with BRVO. If no clear risk factors are found, a more extensive workup should be considered.

Complications of hydrogel explants used in scleral buckling surgery.

PURPOSE: To report a group of patients with symptoms of pain, strabismus, sensation of orbital fullness, and presence of a subconjunctival mass many years after successful scleral buckling surgery using hydrogel explants. DESIGN: We present an interventional consecutive case series of patients who underwent scleral buckling surgery using hydrogel explants from 4 to 14 years before onset of clinical symptoms. SETTING: This is a retrospective, multicenter clinical study. PATIENT POPULATION: 17 eyes of 15 patients presented with this disorder. All patients were examined; Snellen acuity, ocular motility, tonometry, slit lamp, and fundus examination were recorded. Two patients underwent either computed tomography or magnetic resonance imaging. Removal of the hydrogel explant was attempted in all patients. Removal of the buckle was technically difficult; the hydrogel material was fragile and fragmented when handled. RESULTS: All patients had prompt relief of pain and discomfort. Ocular motility and diplopia were greatly improved. Extraocular muscle surgery was not required in any case. Three eyes had intraoperative eye wall perforation. One eye developed postoperative bacterial endophthalmitis. Five eyes had recurrence of retinal detachment. One eye had additional complications of corneal edema and glaucoma. CONCLUSIONS: Patients who develop this clinical condition should be considered for removal of the hydrogel scleral buckle. Early recognition of this condition may prevent serious complications associated with delayed removal.

Laboratory evaluation of hypercoagulable states in patients with central retinal vein occlusion who are less than 56 years of age.

PURPOSE: To investigate whether hypercoagulability plays a role in thrombus formation in patients with central retinal vein occlusion (CRVO) who are less than 56 years of age. DESIGN: Prospective, observational case series with retrospective comparative controls. PARTICIPANTS AND CONTROLS: Participants included 55 consecutive patients with CRVO less than 56 years of age. The laboratory's age-matched control groups were used to compare results for the same tests. METHODS: Fifty-five patients with CRVO less than 56 years old (mean age, 44 years) underwent laboratory evaluation for homocysteine, activated protein C resistance, protein C activity, protein S activity, antithrombin III activity, antiphospholipid antibodies, and anticardiolipin antibodies. The results were compared with previously drawn age-matched control groups obtained by the same laboratory for statistical significance. MAIN OUTCOME MEASURES: Patients were considered to have a positive test if their results were outside the laboratory's established range. RESULTS: Fifteen of 55 patients (27%) had one positive test result suggesting hypercoagulability. Compared with the control groups, these patients less than 56 years old with CRVO had a higher incidence of coagulation abnormalities by laboratory testing. Among the parameters tested, hyperhomocysteinemia and circulating antiphospholipid antibodies were significantly more common in the CRVO patients (P < 0.05) compared with age-matched controls. CONCLUSIONS: Hypercoagulability may play a role in the pathogenesis of CRVO in patients less than 56 years old. The cause of CRVO remains multifactorial, and laboratory tests suggesting hypercoagulable states alone cannot account for the cause in most of these patients less than 56 years of age. The authors recommend examining blood pressure, intraocular pressure, complete blood count, glucose levels, and a lipid panel on all patients with CRVO. When tests for these common risk factors for CRVO are negative, consider ordering selected tests in young patients with CRVO to rule out thrombophilias, especially in patients with bilateral CRVO, a history of previous thrombosis, or family history of thrombosis.