A 40-year-old woman had pregnancy-induced hypertension, disseminated intravascular coagulation (DIC), choroidal infarction, and magnetic resonance imaging (MRI) high-signal abnormalities in the occipital regions. With successful treatment of the hypertension and spontaneous resolution of the DIC, the MRI signal abnormalities resolved, but visual acuity remained decreased because of damage to the retina and choroid. This case demonstrates that pregnancy-induced hypertension, particularly if combined with DIC, may produce infarction of the retina and choroid and persistent visual loss even if the effect of this condition on the occipital lobes is limited to reversible vasogenic edema.
Retinal Research Unit, King's College Hospital, University of London, London, England.
Address correspondence to Dr. Nishal Patel, Retinal Research Unit, Normandy Building, King's College Hospital, University of London, Denmark Hill, SE5 9RS, London, England; E-mail: firstname.lastname@example.org, email@example.com
After the delivery of twins by caesarean section, a 40-year-old woman had pregnancy-induced hypertension. She was treated successfully with intravenous labetalol 200 mg twice daily for 2 days to control an initial blood pressure of 210/140, followed by the same dose orally for 5 days. A low platelet count (92,000), a raised fibrinogen level (5.5), and an elevated fibrin degradation product D-dimer (1.6 μg/mL, normal <0.4 μm/mL) indicated disseminated intravascular coagulation, which resolved spontaneously without treatment.
Visual acuity was 20/20 OU after delivery but deteriorated 5 days later to finger counting at 3 feet OU. Goldmann visual fields revealed bilateral central scotomas. Ophthalmoscopy showed pallid retinal edema with scattered hemorrhages at both posterior poles (Fig. 1 top). Fluorescein angiography showed extensive choroidal ischemia in the macular region accompanied by late leakage from retinal vessels OU (Fig. 1 bottom).
Magnetic resonance imaging (MRI) T2 and FLAIR sequences performed 2 days after delivery showed subcortical and cortical high-signal predominantly within the occipital regions bilaterally (Fig. 2A). This signal change was initially believed to represent watershed infarction (diffusion-weighted MRI was not performed). However, a repeat MRI 3 months later showed no abnormalities on the same pulse sequences (Fig 2B).
At 12 months after delivery, visual acuity had improved to 20/200 OD and 20/120 OS and ophthalmoscopy showed bilateral optic disc pallor indicative of inner retinal and/or optic nerve infarction and macular pigmentary changes indicative of choroidal infarction (Fig. 3).
The reversal of the MRI abnormalities indicates that the initial signal change did not represent watershed ischemia, but rather vasogenic edema associated with hypertensive encephalopathy (1). Identical MRI signal abnormalities are seen in patients treated with cyclophilins (cyclosporine or tacrolimus). Discontinuation of the agent leads to clinical and imaging recovery (2,3).
The persistent visual loss in our patient is caused by ischemic damage to the retina and choroid. In most cases of retinochoroidal ischemia in the setting of pregnancy-induced hypertension, the visual prognosis is good (4). In this case, the poor outcome may reflect the superimposition of disseminated intravascular coagulation, itself known to be a risk factor for choroidal ischemia (5).
Our case demonstrates that pregnancy-induced hypertension, particularly if combined with disseminated intravascular coagulation, may infarct the retina and choroid even if the effect of this condition on the posterior brain hemispheres is limited to reversible vasogenic edema.
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