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Blood pressure control for diabetic retinopathy.
Diana V Do1, Genie Han2, Samuel A Abariga2
1Byers Eye Institute, Stanford University School of Medicine, Palo Alto, California, USA.
The Cochrane Database of Systematic Reviews
|March 28, 2023
Summary
Intensive blood pressure control modestly reduces the incidence of diabetic retinopathy in type 2 diabetics, especially those with hypertension. However, evidence for slowing progression or benefiting normotensive diabetics is limited.
Area of Science:
- Ophthalmology
- Endocrinology
- Nephrology
Background:
- Diabetic retinopathy (DR) is a leading cause of vision loss in diabetics.
- Blood glucose and blood pressure control are crucial for managing diabetes complications.
- Evidence on the impact of blood pressure control on DR is varied.
Approach:
- Systematic review and meta-analysis of 29 randomized controlled trials (RCTs).
- Included 4620 type 1 and 22,565 type 2 diabetic participants.
- Assessed effects of intensive vs. less intensive blood pressure control on DR incidence, progression, visual acuity, and adverse events.
Key Points:
- Intensive blood pressure control showed a modest benefit in reducing the five-year incidence of diabetic retinopathy (RR 0.82, 95% CI 0.73-0.92).
- A similar benefit was observed for the combined outcome of DR incidence and progression (RR 0.78, 95% CI 0.68-0.89).
- No significant benefit was found for DR progression, macular edema, or visual acuity loss.
- Hypertensive type 2 diabetics experienced greater benefits from intensive blood pressure control.
- Increased risk of hypotension was noted with intensive control (RR 2.04, 95% CI 1.63-2.55).
Conclusions:
- Blood pressure intervention offers a modest benefit in preventing diabetic retinopathy for up to five years, particularly in hypertensive type 2 diabetics.
- Limited evidence supports blood pressure intervention for slowing DR progression or benefiting normotensive diabetics.
- Further research is needed to clarify the role of blood pressure management in preventing DR in non-hypertensive diabetic populations.
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