Electrically Induced Thrombosis in Intracranial Aneurysms

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The occasional observation of spontaneous occlusion of an intracranial aneurysm has suggested the possibility of a surgically induced thrombosis (Fig. 1). Laboratory studies have shown that thrombosis could be produced very easily in artificial aneurysms of the femoral artery of the dog by passage of a small direct electrical current across the sac. Thrombosis in an intact femoral artery required the insertion of an intra-arterial anode and a current of 50 to 2,000 µA. for a period of about 1 to 2 hrs. This clot lasted only a few days and in the course of its

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    Twenty-three years previously patient had headache and palsy of the 3rd nerve from which he made a subtotal recovery. Left shows calcification adjacent to posterior clinoid. Right shows that this area does not fill with contrast material.

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    Case 10. Progressive thrombosis of aneurysm of genu of anterior cerebral artery over a period of 135 min. Current starting at 200 was gradually increased to 2,000 µA.

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    Case 1. Top right: lateral view. All others are anteroposterior views of aneurysm of internal carotid artery. Bottom right shows subtotal thrombosis after 6½ hrs., 200–2,000 µA.

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    Case 2. Top, anteroposterior and lateral views of aneurysm before thrombosis. Note bilobed appearance on anteroposterior view. Middle, reappearance of aneurysm 2 weeks after complete obliteration. Note persistence of neck only. Bottom, appearance after 7 months.

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    Case 3. Lateral view of aneurysm of internal carotid artery showing progressive thrombosis.

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    Case 3. Top left, anteroposterior view; top right, lateral view pre-operatively. Bottom left, anteroposterior view. Bottom right, lateral view 8 wks. after thrombosis.

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    Case 5. Top, before thrombosis. Middle, immediately after. Bottom, 2 wks. after.

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    Case 8. Anteroposterior views. Left, before; middle, after; right, 4 wks. after thrombosis.

References

1.

MullanS.BeckmanF. and VailatiG. Simplified thrombosis of a large hypertrophic hemangioma of the scalp. J. Neurosurg.196421: 6872.Mullan S. Beckman F. and Vailati G. Simplified thrombosis of a large hypertrophic hemangioma of the scalp. J. Neurosurg. 1964 21: 68–72.

2.

MullanS.BeckmanF.VailatiG.KarasickG. and DobbenG. An experimental approach to the problem of cerebral aneurysm. J. Neurosurg.196421: 838845.Mullan S. Beckman F. Vailati G. Karasick G. and Dobben G. An experimental approach to the problem of cerebral aneurysm. J. Neurosurg. 1964 21: 838–845.

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