The choroidal structure changes in a case with hypertensive choroidopathy

Malignant Hypertension and the Role of Ophthalmologists: A Review Article

Malignant hypertension (MHT) is a sudden and severe increase in systemic blood pressure (BP) associated with advanced bilateral retinopathy. It comes under a broader term, called hypertensive emergency, where an acute rise in BP results in end-organ damage. The condition usually requires hospital admission and intensive care management. Although there are lots of sophisticated machines and laboratory tests present to diagnose various organ damage, the role of ophthalmologists will still be at the top. A record of the acute rise of BP to a defining level and simple ophthalmoscopy with high clinical suspicion can save a patient’s life and preserve target organ function by timely referral. So, every ophthalmologist should be aware of this dangerous condition. In this review, we have tried to compile all the current knowledge regarding malignant hypertension that an ophthalmologist may require in day-to-day practice.

Ischemic Choroidal Diseases

INTRODUCTION

Ischemic choroidal diseases are an underdiagnosed entity. The clinical pattern varies according to the size and the localisation of the affected vascular structure.

CLINICAL PRESENTATION

In eyes with occlusion of the long posterior ciliary arteries, characteristic triangular patches of choroidal ischemia (Amalric sign) are seen, which in the course of time merge into well-defined areas of atrophy of the retinal pigment epithelium. Above the non-perfused choroidal areas, hyperpigmented, grouped lines appear (Siegrist streaks). Circumscribed ischemia of smaller choroidal arterioles and capillary vessels appears as multifocal, yellowish lesions in the posterior fundus (Elschnig spots). Vortex vein occlusion becomes manifest as exudative haemorrhagic choroidal swelling in the periphery.

CAUSES OF CHOROIDAL ISCHEMIA

Apart from arterial hypertension as a major risk factor, some immunological disorders such as giant cell arteritis and systemic lupus erythematosus and haematological pathologies also affect choroidal perfusion. Furthermore, choroidal ischemia occurs due to local inflammation, as found in eyes with acute multifocal posterior placoid pigment epitheliopathy (APMPPE). Rarely, choroidal infarction is of iatrogenic origin or drug-induced. Recent advances in imaging, such as the introduction of enhanced depth imaging optical coherence tomography (EDI-OCT) and OCT angiography (OCT-A), have improved the visualisation of the choroidal vasculature and complement the classical angiographic procedures. In patients with age-related macular degeneration (AMD) and diabetes, some changes in choroidal blood flow and vascular structure have also been noted. While in AMD the choroidal pathologies correlate with the disease progression and the functional prognosis, the pathophysiological relationship between diabetic choroidopathy and retinopathy is currently unclear.

MANAGEMENT AND CONCLUSION

With regard to the limited therapeutic options for choroidal ischemia, optimisation of the cardiovascular risk profile and the management of accompanying ocular and systemic diseases are essential.