| Abstrakt: |
Shunt through cerebral arteriovenous malformations (AVMs) causes not only cerebral hemodynamic changes, but also affects the cardiovascular system as a whole. Forty-two patients aged 15 to 62 years were examined. Group 1 included 19 patients with AVM < 20 cm3; Group 2 comprised 23 patients with AVMs > 21 cm3. Cerebral angiography revealed AVMs afferents and stroma. Before and after surgery, total cerebral blood flow was estimated by color duplex scanning of cephalic large arteries; and the heart and systemic hemodynamics were evaluated by ECG, echoECG, and 24-hour blood pressure monitoring. Thus, small AVMs with insignificant arteriovenous shunt do not considerably affect cerebral and systemic hemodynamics (eukinetic hemodynamics). Large AVMs enhance functional load on the cardiovascular system whose hyperfunction as the basic mechanism of cerebral blood flow compensation in arteriovenous shunt through cerebral AVMs is effected by increasing cardiac and stroke, circulating blood volume, blood pressure, and tachycardia. These changes are functional. |
