Cannabis Use Linked to Lower Proliferative Vitreoretinopathy Risk Post-Retinal Detachment Repair
Overview
A multicenter retrospective cohort study found that long-term cannabis users undergoing retinal detachment repair had significantly lower rates of postoperative proliferative vitreoretinopathy (PVR) compared to matched controls. Although the absolute risk reduction was modest, cannabis use was associated with nearly half the risk of developing PVR at 1 year post-surgery.
Background
Proliferative vitreoretinopathy (PVR) is a common and serious complication following retinal detachment (RD) repair, often leading to complex reoperations and vision loss. Identifying modifiable risk factors for PVR is critical to improving surgical outcomes. Cannabis is the third most consumed psychoactive substance globally, yet its impact on ocular surgery outcomes remains unclear. This study aimed to evaluate the association between long-term cannabis use and PVR risk after RD repair.
Data Highlights
| Outcome | Timepoint | Cannabis Users (%) | Controls (%) | Relative Risk (RR) | P Value |
|---|---|---|---|---|---|
| PVR Incidence | 6 months | 2.10 | 4.36 | 0.48 | 0.002 |
| PVR Incidence | 1 year | 2.52 | 4.61 | 0.55 | 0.006 |
| Complex RD Repair | 6 months | 3.10 | 5.03 | 0.62 | 0.02 |
| Complex RD Repair | 1 year | 3.52 | 5.62 | 0.63 | 0.01 |
| PVR Incidence (PPV subgroup) | 6 months | 2.34 | 4.55 | 0.51 | 0.01 |
| PVR Incidence (PPV subgroup) | 1 year | 2.95 | 5.04 | 0.59 | 0.03 |
Key Findings
- At 6 months post-RD repair, PVR incidence was 2.10% in cannabis users vs 4.36% in controls (RR=0.48; P=.002).
- At 1 year, PVR incidence remained lower in cannabis users (2.52%) compared to controls (4.61%) with RR=0.55 (P=.006).
- Rates of complex retinal detachment reoperations were significantly lower in cannabis users at both 6 months and 1 year.
- In the PPV subgroup, cannabis users had significantly reduced PVR rates at 6 months and 1 year, but no significant difference in complex repair rates.
- Risk factors increasing PVR risk included vitreous hemorrhage, ocular trauma, myopia, and cigarette use.
- Cannabis use was associated with a hazard ratio of 0.49 for PVR risk at 1 year, indicating a protective association.
Clinical Implications
While cannabis use appears to be associated with a modest reduction in PVR risk following retinal detachment repair, the absolute risk reduction is small and may limit immediate clinical application. Clinicians should continue to counsel patients on known risk factors such as cigarette smoking and ocular trauma. Further prospective intervention trials are needed to clarify whether cannabis itself confers protective effects or if observed associations are due to confounding factors.
Conclusion
This study suggests a potential protective association between long-term cannabis use and reduced risk of postoperative PVR after retinal detachment repair. However, the modest absolute risk reduction and study limitations warrant cautious interpretation and further research.
References
- Alshaikhsalama et al. 2024 -- Cannabis Use and Proliferative Vitreoretinopathy Risk After Retinal Detachment Repair
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