Abstract
The microsurgical extracranial-intracranial arterial bypass (EIAB) procedure, usually performed to anastomose the superficial temporal artery to a cortical branch of the middle cerebral artery, offers a therapeutic alternative in treating patients who present with symptoms of cerebral ischemia varying from transient ischemic attack (TIA) to stroke-in-evolution, and who have intracranial or otherwise inaccessible high cervical carotid lesions. Preoperative diagnostic steps include angiography, computer-assisted tomography (CT) scan, and measurements of regional cerebral blood flow (rCBF).
A comparison of our series of 172 patients with series reported in the literature suggests that EIAB is more effective than medical therapy in preventing the development of permanent neurological deficit after a series of TIA and in treating cases of stroke-in-evolution. It also can prevent further deterioration in selected patients after stroke. An analysis of patients who had an unfavorable outcome suggests that bilateral EIAB should be performed in a greater number of patients who have generalized low-perfusion syndrome; that low doses of heparin should be administered intraoperatively and postoperatively in patients who have high-grade siphon stenosis; and that aspirin should be given to patients experiencing TIA after EIAB.
Résumé
Les techniques microchirurgicales de bypass entre vaisseaux extra-et intracrâniens (BEIC) réalisent, en général, une anastomose entre l'artère temporale superficielle et une branche corticale de l'artère cérébrale moyenne. Elles offrent des possibilités thérapeutiques aux malades qui présentent des symptomes d'ischémie cérébrale, allant de l'épisode ischémique transitoire à l'ictus, et qui sont atteints de lésions carotiennes soit intracrâniennes, soit haut situées dans le cou, et inaccessibles par voie cervicale. La mise au point pré-opératoire de ces cas doit comporter une angiographie, une tomographie axiale computérisée et des mesures du débit sanguin cérébral régional.
Une analyse de notre série personnelle de 172 cas et d'autres séries rapportées dans la littérature suggère que le BEIC est plus efficace que le traitement médical pour prévenir les séquelles neurologiques après épisode ischémique transitoire et pour traiter les cas qui évoluent vers l'infarctus cérébral. Le BEIC peut aussi prévenir l'aggravation chez certains malades sélectionnés qui ont fait un ictus. L'analyse des cas qui ont eu une évolution favorable suggère qu'un BEIC bilatéral doit être réalisé chez un plus grand nombre de malades atteints d'un syndrome généralisé de perfusion à faible débit, qu'il faut administrer pendant et après l'opération de l'héparine à faibles doses chez les patients qui ont une sténose serrée du siphon carotidien et qu'il faut prescrire de l'aspirine aux malades qui présentent un épisode ischémique transitoire après BEIC.
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Mehdorn, H.M., Hoffman, W.F. & Chater, N.L. Microvascular neurosurgical arterial bypass for cerebral ischemia: A decade of development. World J. Surg. 3, 197–206 (1979). https://doi.org/10.1007/BF01561274
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DOI: https://doi.org/10.1007/BF01561274