What are the causes of retinal arterial occlusion ?
The commonest cause is emboli arising from the major arteries supplying the head or'rom the left side of the heart. Embolic particles consist of platelet clumps, cholesterol crystals or Hollenhorst plaques and others (mixed thrombus, calcific or septic material from cardiac valves, fat, myxoma, talc in intravenous drug abusers or silicone in those who receive injections for cosmetic purposes).
Other causes include:
• Temporal arteritis.
• Collagen vascular diseases.
• Increased orbital pressure, e.g. retrobulbar haemorrhage, Graves' exophthalmos.
• Sickle cell disease.
• Acute arteriolar spasm due to intranasal cocaine.
• Syphilis.
Lexo edhe:
The commonest cause is emboli arising from the major arteries supplying the head or'rom the left side of the heart. Embolic particles consist of platelet clumps, cholesterol crystals or Hollenhorst plaques and others (mixed thrombus, calcific or septic material from cardiac valves, fat, myxoma, talc in intravenous drug abusers or silicone in those who receive injections for cosmetic purposes).
Other causes include:
• Temporal arteritis.
• Collagen vascular diseases.
• Increased orbital pressure, e.g. retrobulbar haemorrhage, Graves' exophthalmos.
• Sickle cell disease.
• Acute arteriolar spasm due to intranasal cocaine.
• Syphilis.
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Lexo edhe: