In the DRS (Diabetic Retinopathy Study), the 'high-risk characteristics' (HRC) for severe visual loss that mandated immediate panretinal photocoagulation (PRP) included which combination?
- A NVD > 1/3 disc area (DA), any vitreous hemorrhage, NVE > 1/2 DA with any hemorrhage
- B NVD of any amount with preretinal or vitreous hemorrhage; NVD > 1/4-1/3 DA even without hemorrhage; NVE > 1/2 DA with preretinal or vitreous hemorrhage ✓
- C CSME with IRMA and NVE anywhere in the fundus without hemorrhage
- D 4-2-1 rule: hemorrhage in 4 quadrants, IRMA in 2 quadrants, venous beading in 1 quadrant
Explanation
The DRS (Diabetic Retinopathy Study) defined high-risk characteristics (HRC) for severe visual loss (< 5/200 at 2+ follow-up visits) as: (1) neovascularization of the disc (NVD) ≥ 1/4 to 1/3 disc area, even without hemorrhage; (2) NVD of any size accompanied by preretinal or vitreous hemorrhage; and (3) neovascularization elsewhere (NVE) ≥ 1/2 disc area accompanied by preretinal or vitreous hemorrhage. Eyes with HRC had a 5-year severe visual loss risk of 26-37% without treatment, reduced to 11-20% with PRP. This established PRP as standard-of-care for high-risk PDR. The 4-2-1 rule (answer D) is from ETDRS and defines severe NPDR — predicting 50% conversion to PDR within 1 year.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
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