We present a patient with internal carotid artery occlusion and ischemic oculopathy in whom extracranial-intracranial arterial bypass improved vision. Visual evoked potentials were studied to obtain objective criteria for indication and follow-up evaluation and confirmed that the improved vision was due to improved retinal function.
In order to better define patients who might benefit from cerebral revascularization surgery, transcranial Doppler sonography was used in more than 480 patients. Thus invasive diagnostic studies could be limited to probable surgical candidates. Transcranial Doppler sonography has proven to be reliable for the study of the degree of efficacy of intracranial collateral pathways in hemodynamic borderline situations. Over the last 4 years, the application of the algorythm presented in this paper resulted in a reduction of the number of candidates for surgical revascularization to 19.
Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.