Pulmonary hypertension (PH) is a complex and serious condition characterized by elevated blood pressure in the arteries of the lungs. This increase in pressure makes it harder for the heart to pump blood through the lungs, leading to increased strain on the right side of the heart [7]. If left untreated, PH can result in right heart failure and can be life-threatening [1].
PH is defined as a mean pulmonary artery pressure (mPAP) greater than 20 mmHg at rest, as measured during a right heart catheterization (RHC) [6]. It is estimated to affect about 1% of the global population, with a higher prevalence in women [6]. The symptoms of PH are often non-specific, which can lead to delays in diagnosis [2]. Beyond the heart and lungs, PH can impact other organs, including the kidneys and liver [6, 7].
How PH Can Affect Your Eyes
The elevated pressure associated with pulmonary hypertension can have a direct impact on the eyes. This occurs because increased venous pressure in the superior vena cava, a large vein that carries deoxygenated blood to the heart, can extend to the ophthalmic veins that drain blood from the eyes [1].
When these ophthalmic veins experience increased pressure, they can dilate, leading to congestion in the choroid, a vascular layer of the eye that supplies blood to the retina. This congestion and increased pressure within the eye's delicate structures can trigger a range of ocular complications [1].
Specific Ocular Complications of PH
The eye complications linked to pulmonary hypertension are varied and can affect different parts of the eye. These may include [1]:
- Ciliary detachment: Separation of the ciliary body, a structure involved in producing fluid for the eye and controlling lens shape.
- Central retinal vein occlusion: A blockage of the main vein that drains blood from the retina, which can lead to sudden, painless vision loss.
- Acute serous retinal detachment: A condition where fluid accumulates under the retina, causing it to lift away from its underlying support tissue.
- Macular edema: Swelling of the macula, the central part of the retina responsible for sharp, detailed vision.
- Retinal neovascularization: The growth of abnormal new blood vessels on the retina, which are fragile and can bleed, leading to vision problems.
- Choroidal effusions: Fluid accumulation in the choroid, potentially causing the choroid to detach.
- Chemosis: Swelling of the conjunctiva, the clear membrane covering the white part of the eye.
- Angle-closure glaucoma: A type of glaucoma where the iris blocks the drainage angle of the eye, leading to a rapid increase in eye pressure.
- Transient myopia: Temporary nearsightedness, where distant objects appear blurry.
- Proptosis: A bulging or protrusion of one or both eyeballs.
It's also important to note that some ophthalmic disorders can arise as side effects of treatments used for pulmonary hypertension [1].
Why Early Detection Matters
Given that ocular complications can be a manifestation of pulmonary hypertension, patients may sometimes first seek care from an ophthalmologist due to vision changes [1]. An eye care specialist might then identify these conditions, potentially leading to further investigation for underlying PH.
For individuals already diagnosed with pulmonary hypertension, careful self-observation of visual function is crucial. Any deterioration in vision or new eye symptoms should be reported to a healthcare provider immediately [1]. Early recognition and management of these eye issues can be important for preserving vision and ensuring comprehensive care for PH.
Distinguishing PH Eye Issues from Other Conditions
It is important to understand that not all eye conditions related to high pressure are due to pulmonary hypertension. For example, systemic hypertension (high blood pressure in the body's main arteries) can also affect the eyes, leading to conditions like hypertensive retinopathy, retinal vein and artery occlusion, and ischemic optic neuropathy [3]. Systemic hypertension is also a risk factor for glaucoma and can worsen diabetic retinopathy [3].
Other distinct conditions include ocular hypertension, which refers specifically to elevated pressure within the eye itself and is a risk factor for primary open-angle glaucoma [5]. Idiopathic intracranial hypertension (IIH) is another condition involving raised pressure, but it occurs within the skull and can cause headaches, visual disturbances, and papilledema (swelling of the optic nerve) [8]. While these conditions can present with similar visual symptoms, their underlying causes and mechanisms are different from those seen in pulmonary hypertension.
Managing Pulmonary Hypertension and Eye Health
Managing pulmonary hypertension typically involves therapies aimed at decreasing pulmonary pressures, such as vasodilators and other advanced treatments [6]. For patients with PH, regular monitoring of overall health, including eye health, is an important part of comprehensive care. If eye complications arise, their management will be coordinated with the overall PH treatment plan, often involving both ophthalmologists and pulmonologists or cardiologists.
Sources
- Ocular manifestations of pulmonary hypertension. https://pubmed.ncbi.nlm.nih.gov/30849428/
- Diagnosis of pulmonary arterial hypertension: a statement from the Brazilian Thoracic Association. https://pubmed.ncbi.nlm.nih.gov/42307332/
- The eye in hypertension. https://pubmed.ncbi.nlm.nih.gov/17276782/
- What We Have Learned From the Ocular Hypertension Treatment Study. https://pubmed.ncbi.nlm.nih.gov/29501371/
- The New Era of Pulmonary Hypertension: The Dawn of Disease Modification & Therapeutic Modalities. https://pubmed.ncbi.nlm.nih.gov/42188060/
- Pulmonary Hypertension and Kidney Disease: A Review of a High-Risk Patient Population. https://pubmed.ncbi.nlm.nih.gov/42335018/
- Idiopathic Intracranial Hypertension Masquerading as Cerebral Venous Sinus Thrombosis: A Diagnostic Challenge. https://pubmed.ncbi.nlm.nih.gov/42544001/