Real-time in vivo confocal laser endomicroscopic imaging of equine endometrium: Preliminary observations and feasibility study.
Authors: Gallacher K, Woolford L, Santos L C, Serpa P B S, Len J, Gilbert R O, Kind K L
Journal: Veterinary journal (London, England : 1997)
Summary
Confocal laser endomicroscopy (CLE) represents a promising advancement for real-time endometrial assessment in broodmares, addressing a longstanding limitation in reproductive diagnostics where traditional histopathology relies on single-point biopsies that may not capture the full picture of uterine health. Gallacher and colleagues evaluated the feasibility of this fibre-optic imaging technique across 44 mares, establishing that intravenous fluorescein sodium at 4 mg/kg provides optimal tissue contrast without adverse effects, enabling visualisation of cellular architecture including epithelial integrity, inflammatory infiltration, glandular morphology, and interstitial fibrosis during a single endoscopic examination. The technique successfully distinguished key pathological features—ulceration, exocytosed inflammatory cells, abnormal gland distribution, and fibrotic changes—with image quality correlating somewhat with oestrous cycle stage, though this warrants further investigation. For equine practitioners, CLE's capacity to assess multiple endometrial regions non-destructively offers a significant advantage over conventional biopsy in directing evidence-based treatment strategies and monitoring response to therapy, particularly valuable when evaluating subfertile mares where focal lesions might otherwise be missed. Establishing this diagnostic framework opens the door to improved reproductive outcomes through earlier, more comprehensive identification of endometrial pathology that currently limits broodmare performance.
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Practical Takeaways
- •CLE offers a non-invasive alternative to traditional endometrial biopsies, allowing rapid assessment of multiple uterine regions and 'virtual biopsies' for more comprehensive endometrial evaluation
- •A standardized fluorescein dose of 4 mg/kg produces optimal imaging without adverse effects, establishing a safe protocol for clinical use in mares
- •This technology may improve diagnostic accuracy for endometrial pathology and treatment planning in broodmare reproductive management, though further refinement of imaging protocols across oestrous cycles is needed
Key Findings
- •Confocal laser endomicroscopy (CLE) is feasible for real-time in vivo imaging of equine endometrium with no adverse reactions to IV fluorescein sodium
- •Optimal image contrast achieved at 4 mg/kg fluorescein sodium dose (0.04 mL/kg of 10% solution)
- •CLE enables assessment of luminal epithelium integrity, gland distribution/density/shape, blood vessels, inflammatory cells, and interstitial fibrosis across multiple endometrial regions
- •Image quality varied between mares, potentially influenced by oestrous cycle stage, demonstrating advantages over single-site histopathological biopsies