Daniel Duterte

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We performed transcranial Doppler (TCD) examinations on 54 comatose patients over a 1-year period. Of 49 patients with technically adequate TCD examinations, 23 met criteria for determination of brain death by clinical and EEG criteria (21) or clinical criteria alone (2; EEG not performed). A TCD waveform abnormality, consisting of absent or reversed(More)
The effects of ageing in normal and pathological rats were studied. Learning (spatio-temporal test) was measured simultaneously with the local cerebral blood flow, determined by a diffusible indicator (iodoantipyrine) and with the uptake and consumption of glucose, determined by the deoxyglucose. Normal ageing disturbs the learning with a decrease in(More)
We performed transcranial Doppler ultrasonography on 15 patients with arteriovenous malformations before and after embolization or surgical resection to compare quantitatively the hemodynamic effects of these two treatments. Changes in mean blood velocity and pulsatility index were analyzed in 19 treated feeding arteries. Blood velocity decreased by a mean(More)
We performed duplex and transcranial Doppler studies in 36 patients with angiographically documented internal carotid artery occlusion (ICAO) to determine the effect of ophthalmic artery collateral (OAC) on measures of vascular resistivity both proximal and distal to the occlusion. Resistance in the common carotid artery, measured by the resistivity index,(More)
In the present work, a study of the number of functional receptors has been made with 3HQNB given to resting awaken animals during a learning process. Ageing leads to a decrease in the ability of learning associated with an increase in the number of large movements. The number of cholinergic receptors is also reducel if we compare 22 month old animals with(More)
Transient ischemia results in changes in the cerebral blood flow at the level of microinfarcts, enzymatic and metabolic changes and the development of a cerebral edema; all these disorders regress in the week following ischemia. Besides, the observed functional disorders disappear as the cerebral edema regresses. The brain functional activity is protected(More)
Experimental microembolization of the rat brain has been used as a model for the production of cerebral microinfarction which resulted in a decrease in blood flow and secondary brain edema with changes in the oxidative metabolic pathways. The use of radioactive microspheres as embolizing agents allowed to determine the number of microinfarctions and their(More)
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