Article

In pregnancy, the retina ‘works’ for two

Retinal health reflects placental health. In this diabetic patient’s case, a pre-eclampsia diagnosis awaited her.

Our patient was a 39-year-old, 28-week pregnant African-American female with hypertension and insulin-dependent diabetes, referred by optometry. She reported a two-month history of blurry vision. Her blood sugar was in the 100s and her most recent hemoglobin A1c was 7.3.

THE OCULAR EXAM

During her eye exam, we found the following:

  • Distance vision without correction: 20/20 OD, 20/200 OS
  • Pupils: briskly reactive without APD
  • IOP: 20 OD, 23 OS
  • Anterior segment: unremarkable OU
  • Posterior segment: indicative of ischemic non-proliferative diabetic retinopathy (NPDR) and vaso-occlusive macular disease OU (Figure 1)

Figures 1a and 1b. Color fundus photo OU demonstrating bilateral macular ischemia with microaneurysms, multiple cotton wool spots and sclerotic vessels indicative of ischemic nonproliferative diabetic retinopathy and vaso-occlusive macular disease OU.

DIABETIC RETINOPATHY IN PREGNANCY

The rate of diabetic retinopathy (DR) progression in pregnancy depends on the pre-pregnancy DR stage. In a study of diabetic women, 6.3% of those with mild NPDR progressed to proliferative diabetic retinopathy (PDR) and 29% of those with moderate-severe NPDR progressed to PDR.1 Risk factors for DR progression during pregnancy include duration of diabetes, hypertension, poor glycemic control and rapid blood glucose changes.2,3

While the exact mechanism for DR progression in pregnancy is not well understood, possible etiologies include pregnancy-induced physiological changes in blood volume and pressure, retinal perfusion alterations and effects mediated by fluctuating hormone levels.4-8 Management of DR during pregnancy includes medical optimization of blood glucose control, as well as focal and grid laser for localized vessel leakage and diffuse permeability, respectively, if required.9-11

There are few reports of therapeutic intravitreal injections of anti-VEGF agents during pregnancy, with three associated fetal deaths documented. The current recommendation, therefore, is to refrain from anti-VEGF injections until after delivery.12

Indications for surgical intervention include tractional retinal detachment, non-clearing vitreous hemorrhage and management of neovascular glaucoma; however, surgical and anesthesia care must be coordinated with the obstetrics-gynecology (OB-GYN) team.13

HYPERTENSIVE RETINOPATHY IN PREGNANCY

Retinal health serves as a reflection of placental health in the pregnant patient, with serious implications for patient and fetus alike. Pre-eclampsia, defined as elevated blood pressure with proteinuria after 20 weeks gestation, can manifest with ocular signs and symptoms of hypertensive retinopathy, such as blurry vision, retinal hemorrhages, macular exudates and cotton wool spots.14-16 A related condition, Purtscher-like retinopathy, is a vaso-occlusive microangiopathy likely due to micro-embolization of retinal vasculature with subsequent tissue infarction.17,18

While laser is a safe therapeutic option for microvascular disease, management of new or worsening hypertensive retinopathy during pregnancy must focus on blood pressure control, seizure prophylaxis and, potentially, the need for early delivery of the infant by the OB-GYN team.19

BACK TO OUR PATIENT

Diagnosed with DR with macular edema, severe ischemia, and probable Purtscher-like retinopathy, we referred our patient to the OB-GYN service for management of underlying pregnancy, diabetes and hypertension, whereupon she met criteria for pre-eclampsia. She was induced at 30 weeks and delivered a healthy infant. Subsequent visits after delivery demonstrated no change in her vision or posterior segment exam. We obtained fluorescein angiogram and optical coherence tomography of the macula (Figures 2 and 3).

Figures 2a and 2b. Fluorescein angiogram OU demonstrating widespread ischemic regions OU (dark) with scattered vascular leakage and neovascularization of the disc OD, seen as leakage of the fluorescein dye, indicative of progression to proliferative diabetic retinopathy OD.

Figures 3a and 3b. Optical coherence tomography of the macula OU demonstrating severe retinal thinning from macular ischemia OU and macular edema OS.

The patient then underwent intravitreal Avastin (bevacizumab, Genentech) OS followed by panretinal photocoagulation OU with macular grid treatment of nonperfused areas for treatment of PDR OD and global ischemic disease OU. She was counseled on blood glucose and blood pressure control and continues to be followed closely.

TAKE-HOME POINTS

This case highlights the pivotal role ophthalmology can play in identifying vision- and life-threatening conditions during pregnancy, as well as the importance of effective communication of new and important clinical findings with other health care teams. OM

REFERENCES

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