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Cerebral arterial lesions resulting from inflammatory emboli
Abstract:
In order to study the effects of septic embolism on the brain, silicone rubber emboli of various types were injected into the carotid arteries of 35 dogs. Pathologic and angiographic studies were performed to assess the resultant arterial and parenchymal lesions. Pure silicone rubber emboli (14 dogs) produced occasional intra-arterial thrombosis but no arteritis. Sterile and bacterially contaminated emboli containing a lead-chromate pigment (similar to those used in previous studies of septic embolism) (11 dogs) and pure silicone rubber emboli with transversely oriented canals (10 dogs), after brief placement in a bacterial suspension, were associated with intense inflammatory arteritis. This was accompanied by focal meningitis, subarachnoid hemorrhage, thrombosis, and cerebritis of the underlying cortex. The findings resembled those found in mycotic aneurysm. Aneurysmal dilatation was observed in one postmortem angiogram. In previous models of mycotic aneurysm, the inflammation attributed to bacterial contamination was probably due to the lead-chromate pigment used.
Insights
Silicone emboli can cause brain inflammation and damage. Lead-chromate pigment in emboli, not bacteria, likely triggers severe arteritis and lesions, mimicking mycotic aneurysms.
Area of Science:
- Neurology
- Pathology
- Biomaterials Science
Background:
- Septic embolism poses a risk to brain health.
- Understanding the inflammatory response to embolic materials is crucial for neurological research.
- Previous studies on septic embolism models may have confounding factors.
Purpose of the Study:
- To investigate the effects of different types of silicone rubber emboli on canine cerebral vasculature.
- To differentiate the inflammatory potential of silicone material versus bacterial contamination.
- To elucidate the pathogenesis of lesions resembling mycotic aneurysms.
Main Methods:
- Injection of various silicone rubber emboli into carotid arteries of 35 dogs.
- Pathologic examination of brain tissue for arterial and parenchymal lesions.
- Angiographic studies to assess vascular changes.
Main Results:
- Pure silicone emboli caused minimal thrombosis without arteritis.
- Emboli with lead-chromate pigment or bacterial exposure induced intense inflammatory arteritis.
- Associated findings included meningitis, subarachnoid hemorrhage, thrombosis, and cerebritis, mimicking mycotic aneurysms.
Conclusions:
- Lead-chromate pigment in silicone emboli is a potent trigger for severe cerebral arteritis.
- Bacterial contamination alone may not be the primary cause of inflammation in previous septic embolism models.
- The study highlights the importance of biomaterial composition in embolic-induced neuropathology.