The eye and the heart

AI Generated Summary*

Written for cardiologists, a narrative review surveys features common to ocular and cardiac circulation. Arteriolar narrowing, arteriovenous nipping and dilated retinal venules are described as signs of raised cardiovascular risk, and narrow arterioles may precede hypertension. Retinal wall-to-lumen ratios from scanning laser Doppler flowmetry track media-to-lumen ratios obtained invasively from subcutaneous small arteries. Flicker light responses, dependent on nitric oxide and an intact endothelium, are reduced in diabetes, obesity, dyslipidaemia and hypertension and partially improved by a week of angiotensin receptor blockade, though that evidence is small and cross-sectional. Unstable ocular perfusion from hypotension, pressure swings or primary vascular dysregulation is proposed to drive oxidative stress in glaucomatous optic neuropathy; venous constriction raises venous pressure and predisposes to vein occlusion.

*This summary was generated by AI and is published unedited. Oku does not alter these summaries. It may contain errors or omissions and is provided for general informational purposes only. Oku does not guarantee its accuracy, completeness, or reliability. For authoritative information, please refer to the original, peer-reviewed article.