Do angiographic data support a detailed classification of hypertensive fundus changes?

Area of Science:

• Ophthalmology
• Cardiology
• Medical Imaging

Background:

• The eye serves as both a target organ and a prognostic indicator for arterial hypertension.
• Ophthalmoscopic classifications grade hypertensive fundus changes into four stages.
• Fluorescein angiography allows assessment of hypertensive alterations in perifoveal microcirculation.

Purpose of the Study:

• To determine if angiographic findings correlate with established ophthalmoscopic classifications of hypertensive retinopathy.
• To compare perifoveal microcirculation in hypertensive patients across different severity stages and with healthy individuals.

Main Methods:

• Compared perifoveal microcirculation in 143 hypertensive patients (stages I-IV) and normal subjects using fluorescein angiography.
• Quantified perifoveal intercapillary area (PIA), foveal avascular zone (FAZ), and capillary blood velocity (CBV) via digital image analysis.
• Utilized Neubauer's classification, a modification of the Keith and Wagener system.

Main Results:

• All hypertensive patients exhibited reduced perifoveal capillary density and decreased capillary blood velocity compared to controls.
• Significant differences in PIA and CBV were observed between mild (stages I-II) and severe (stages III-IV) hypertensive retinopathy.
• No significant angiographic differences were found between stages I and II, nor between stages III and IV.

Conclusions:

• Fluorescein angiography demonstrates significant angiographic differences between mild and severe hypertensive retinopathy.
• A four-stage differentiation, as seen in ophthalmoscopy, is not achievable with current angiographic methods for hypertensive retinopathy.