PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “CEREBROVASCULAR CIRCULATION”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 343 records · Page 19Linked to original sources
PubMed1995

[Clinical-functional classification of combined occlusive lesions of the arterial system].

For a complex approach to the clinico-functional appraisal of the vascular system the authors suggest dividing the arterial system into 4 conventional functional basins: the coronary region (1), the brachiocephalic (2), the visceral (3), and the arterial basin of the lower extremities. In accordance with the 4 distinguished anatomo-functional vascular basins, the classification is designated by their first letters: HBVL, where H stands for the heart, B for the brain, V for the visceral vessels, and L for the lower extremities. Next to each letter is shown the functional class of arterial insufficiency of the vascular basin. The figure 0 denotes the absence of arterial stenosis. All the other figures from 1 to 4 reflect the functional severity of arterial insufficiency. The 1st functional class is characterized by the absence of a clinical picture of the disease in arterial stenosis, the 2nd class by the stage of subcompensation of circulation, and the 3rd and 4th classes by decompensation of circulation. The criteria for separating the degree of ischemia into functional classes are suggested. The HBVL classification is a working one because it not only illustrates and indicates fully the condition of arterial circulation in the vessels of the region but determines the tactics of treatment of the patient. The possibilities of the classification are illustrated by concrete clinical cases.

Arterial Occlusive Diseases↗
PubMed1996

Trachea-innominate artery fistula and concomitant critical cerebrovascular disease.

To avoid the laborious task of investigating the cerebrovascular circulation in the midst of a trachea-innominate artery fistula, we strongly recommend preoperative cerebrovascular investigations in all patients about to undergo mediastinal tracheostomy. Paramount to this dictum remains the possibility of asymptomatic cerebrovascular disease. Inadequate preoperative cerebrovascular assessment may result in, as described in this report, the possibility of significant postoperative neurologic morbidity or mortality. Angiography should assist the surgeon in deciding which method of cerebral arterial reconstruction is best suited to the individual circumstance. We recommend the avoidance of innominate artery reconstruction even with the interposition of autologous tissues, as the operative field remains grossly infected.

Aged↗
PubMed1999

Bilateral vertebral artery dissection causing a cerebrovascular accident in pregnancy. A case report.

BACKGROUND: Vertebral artery dissection, occurring spontaneously or following a traumatic event, is a cause of posterior circulation stroke in young individuals, including pregnant women. CASE: A 20-year-old, primagravid woman acutely developed headache, right-sided hemiparesis and parasthesias, and blurred vision. Within days she complained of cervical neck pain. Magnetic resonance imaging findings were consistent with a posterior circulation cerebrovascular accident (CVA). An arteriogram, performed to exclude vasculitis, revealed bilateral vertebral artery dissection. No inciting event could be recalled. CONCLUSION: Vascular dissections occur rarely during pregnancy. Spontaneous extracranial vertebral artery dissection itself is very rare in general. Cerebral ischemia can follow vertebral artery dissection. In young patients with CVA, consideration of the diagnosis of vertebral artery dissection followed-by angiography and anticoagulation is an important component of the workup and care.

Adult↗
PubMed1976

Correlation between regional cerebral blood flow and oxidative metabolism. In vivo studies in man.

To test the hypothesis that regional cerebral blood flow (rCBF) is normally regulated by regional metabolic activity, rCBF and the regional cerebral metabolic rate for oxygen (rCMRO2) were compared in selected human subjects. In normal subjects and patients with chronic, stable diseases of brain, rCBF correlated well with rCMRO2. In one individual with mild dementia, rCBF and rCMRO2 were measured before and during exercise of the hand and forearm contralateral to the hemisphere studied. Appropriate parallel changes occurred in both rCBF and rCMRO2 during hand exercise. In patients with acute diseases affecting the hemisphere studied, however, the correlation between rCBF and rCMRO2 was unpredictable.

Brain↗
PubMed1977

Staged intracranial and extracranial revascularization.

Twenty patients with a combination of intracranial and extracranial cerebrovascular lesions were identified in a series comprised of 118 candidates for superficial temporal artery to middle cerebral artery (STA-MCA) bypass. Ten patients had internal carotid (ICA) occlusion and contralateral ICA stenosis, seven patients had combinations of ipsilateral lesions, usually ICA occlusion and external carotid (ECA) stenosis, and three patients had multiple lesions. Eighteen patients had a STA-MCA bypass performed; 11 of these had contralateral reconstruction for ICA stenosis, and seven had ECA stenosis corrected. Two additional patients became asymptomatic after ECA endarterectomy only and their proposed STA-MCA bypass has been postponed. There were two deaths, one early and one late. Eleven patients are asymptomatic, five are improved, one is unchanged, and one is neurologically worse.

Adult↗
PubMed1991

Evaluation of collateral flow capacity in patients with vascular or tumorous lesions of the skull base by Doppler sonography.

In 12 patients with vascular or tumorous lesions of the skull base, the collateral flow capacity was examined by transcranial Doppler sonography and carotid compression studies. In four patients no cross flow mechanism was found, in two patients the test remained unclear, and in six patients the examination suggested a good collateral flow capacity. However, for this application of Doppler sonography no borderlines have yet been defined and thus interpretation is difficult. Intraoperative Doppler sonography was used in five patients and proved to be helpful for localisation of the internal carotid artery within skull base tumors.

Adult↗
PubMed1977

[Doppler findings in intracranial vascular disorders. Differential diagnosis of extracranial and intracranial vascular occlusions (author's transl)].

Directional Doppler sonography of the carotid arteries in the neck (selective for the common carotid artery, external and internal carotid arteries) and of the supratrochlear artery permits reliable diagnoses and localizations of extracranial stenoses and occlusions of these arteries. In addition, severe intracranial vascular disorders may also be detected by these methods. Characteristic combinations of Doppler results are described in occlusions of the trunk of the middle cerebral artery, cerebral circulatory breakdown, large arteriovenous angiomas of one hemisphere and carotidcavernous fistulas, and are compared with angiographic findings. The knowledge of these Doppler findings is indispensable for the differential critical evaluation of such disorders found at the level of the neck arteries and at the fronto-orbital terminal branches of the ophthalmic artery.

Adult↗
PubMed1995

Clinical importance of the supra-isthmic anastomosis between the superior thyroid arteries in six cases of occlusion of the common carotid artery.

In six cases of occlusion of a single common carotid artery, antegrade blood flow was demonstrable in the ipsilateral internal carotid artery by doppler ultrasonography. Antegrade blood flow was also observed in the intracranial portion of the internal carotid artery, comparatively reduced and irregular with respect to that of the corresponding contralateral artery. Studies by color doppler ultrasound and digital subtraction angiography revealed the presence of a collateral arch that passed through the supra-isthmic anastomosis between the superior thyroid arteries. All six subjects examined had presented with neurological deficits that subsequently almost completely regressed. The regression of symptomatology indicates the clinical importance of the collateral circle.

Adult↗
PubMed1991

CBF side-to-side asymmetries in stenosis-occlusion of internal carotid artery. Relevance of CT findings and collateral supply.

Cerebral blood flow (CBF) was studied at rest by 133-Xenon inhalation method in 15 normal subjects, in 10 patients with cerebral infarction and normal angiograms of major cerebral arteries and in 28 patients with unilateral stenosis-occlusion of the internal carotid artery (ICA), with or without cerebral infarction. All the normals and 20 patients with ICA stenosis-occlusion were tested again after cerebral vasodilatation induced by an intravenous bolus of acetazolamide. At rest the patients with cerebral infarction, irrespective of whether ICa stenosis-occlusion was present or not, showed abnormal side-to-side CBF asymmetry. After cerebral vasodilation variations in side-to-side asymmetry were shown to depend on the inefficiency of the collaterals and not on the degree of ICA obstruction or on the presence of cerebral infarction. These data indicate that at rest side-to-side CBF distribution is influenced more by the presence of an ischemic zone than by a ICA stenosis-occlusion and that under these circumstances the hemodynamic effect of the vascular stenosis cannot be assessed. After cerebral vasodilatation a subset of patients--irrespective of the degree of ICA obstruction and of whether or not cerebral infarction is present--with true cerebrovascular insufficiency can be isolated.

Acetazolamide↗