Background
Klebsiella pneumoniae pyogenic liver abscess (KP-PLA) is increasingly recognized as a cause of endogenous endophthalmitis (EE), particularly in East and Southeast Asia. Hypervirulent K. pneumoniae (hvKP) strains have been implicated in severe ocular complications, yet comprehensive data on incidence, risk factors, and visual outcomes are limited.
Methods
A systematic review and meta-analysis were conducted following PRISMA guidelines. We searched PubMed, Google Scholar, Cochrane Library, Science Direct for studies reporting KP-PLA-associated EE up to March 2025. Data on patient demographics, comorbidities, microbiological features, treatments, and visual outcomes were extracted. Pooled event rates and odds ratios (OR) with 95 % confidence intervals (CI) were calculated using random-effects models.
Results
Seventeen studies encompassing 219 patients met inclusion criteria. Diabetes mellitus was common among KP PLA associated EE cases (pooled event rate 0.674; 95 % CI: 0.585–0.751; p < 0.001). hvKP strains, identified by positive string tests and virulence genes including rmpA, magA, and aerobactin, predominated in EE cases. Regional differences were observed, with higher prevalence in East and Southeast Asia. Despite aggressive systemic and ocular treatment, visual prognosis was poor: 77.9 % of patients had final visual acuity worse than 3/60. Early pars plana vitrectomy with silicone oil tamponade was associated with fewer postoperative interventions (p < 0.05).
Conclusions
EE is a devastating complication of KP-PLA, particularly in diabetic patients infected with hvKP. Early recognition of at-risk patients and prompt intervention, including early vitrectomy, are crucial to improve visual outcomes. These findings highlight the clinical importance of hvKP in the pathogenesis of EE and reinforce the need for vigilant ophthalmic monitoring in KP-PLA cases.
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