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Biomedical subjects

C B Shields

Publications and source records attributed to C B Shields.

72 records · Page 4Linked to original sources
PubMed1979

The superficial recurrent ophthalmic artery: meningeal supply to petrous ridge meningiomas.

The superficial recurrent ophthalmic artery arising from the second portion of the ophthalmic artery is rarely visible angiographically. Described herein is a patient having a recurrent ophthalmic artery which had hypertrophied to a degree sufficient to supply a highly vascularized meningioma of the petrous ridge. Coexistence of marginal tentorial branches, namely the superficial recurrent ophthalmic artery and the meningohypophyseal trunk, is an embryological dilemma. Furthermore, this case demonstrates the capacity of the ophthalmic artery to supply posteriorly situated neoplasms.

Adult↗
PubMed1978

Spinal subarachnoid hemorrhage during myelography. Case report.

Neoplasms of the conus medullaris and cauda equina have been shown to cause subarachnoid hemorrhage (SAH). In such instances, the hemorrhage has been the presenting symptom. A patient with a neurofibrom at T12-L1 experienced spinal SAH during myelography for suspected lumbar disc disease. The roentgenograms showing the lesion itself first and the subarachnoid clot subsequently may be unique. The cause of hemorrhage in this patient may have been the shearing of bridging capsular veins because of diminished cerebrospinal fluid pressure below the almost obstructing lesion.

Humans↗
PubMed1977

Cerebral edema.

Great strides have been made in understanding the pathogenesis of cerebral edema. Treatment is usually successful, particularly with the newer modes of management (mannitol, steroids, hyperventilation); however, cerebral edema is occasionally resistant to all modes of therapy. At that point, no treatment is effective; even if the patient does survive, he is left with a major severe neurological deficit. Future research must be directed toward methods of reversing this presently untreatable state.

Adrenal Cortex Hormones↗
PubMed1975

Chemonucleolysis.

Explore the source record for details and available documents.

Chymopapain↗
PubMed1974

Metastatic medulloblastoma.

The incidence of metastatic medulloblastoma is probably greater than the thirteen documented patients. Case reports of metastatic medulloblastoma must be carefully analysed. We have added two cases which conform to Weiss' criteria for metastatic disease. The direction and factors influencing spread have been discussed.

Adrenal Gland Neoplasms↗
PubMedDate not supplied

Autogenous artery and vein grafts in common carotid-supraclinoid carotid anastomoses.

Microsurgical techniques employing either autogenous saphenous arterial grafts or venous grafts were used for common carotid-supraclinoid carotid anastomoses (CC-SCAs) in dogs. The CC-SCA provides a large volume of blood to a major vessel supplying the brain. Within 10 to 14 days postoperatively, angiography and postmortem examination showed arterial patency in 9 (69%) of 13 dogs and venous patency in 2 (25%) of 8 dogs. The discrepancy in patency between the arterial and venous grafts may be the result of the differences in construction of arteries and veins, technical failure, shear stress, turbulence, and/or boundary layer separation. The application of autogenous arterial grafts (i.e., radial, hypogastric) in humans seems justified.

Anastomosis, Surgical↗
PubMedDate not supplied

Brain tissue pO2 and pCO2 levels before and after cerebral revascularization.

Microvascular surgical techniques have made possible the improvement of cerebral blood flow, as demonstrated by angiography and by regional cerebral blood flow research. In this study, simultaneous mass spectrometer determinations of brain tissue and blood pO2 and pCO2 levels were used to evaluate the effectiveness of common carotid-supraclinoid carotid anastomoses (CC-SCA) in dogs. With blood pCO2 maintained at a constant level, the baseline brain tissue pO2 and pCO2 levels were recorded. During the CC-SCA procedure, which involved brain retraction and temporary vascular occlusion, brain tissue pO2 levels fell to 40% of baseline and pCO2 levels rose by 35%. Following restoration of flow via the anastomosis, the brain tissue pO2 and pCO2 levels again reached baseline.

Animals↗
PubMedDate not supplied

MR imaging in acute cervical spine trauma.

Fourteen patients with cervical spine injuries, 12 with resultant neurological deficits, were scanned with magnetic resonance (MR) imaging within 7 days following injury. Useful information concerning the status of the spinal canal and disks was obtained in most cases. In addition, MR was able to suggest the nature of the pathological changes within the spinal cord, as well as hemorrhage and edema in the extraspinal soft tissues. These observations indicate that following acute cervical spine trauma, MR is a valuable technique in assessing injury to the spinal cord, surrounding soft tissues, vertebra, and disks.

Cervical Vertebrae↗
PubMedDate not supplied

Multicenter retrospective review of results and complications of carotid endarterectomy in 1981.

A multicenter retrospective audit of carotid endarterectomies performed during 1981 was completed with 46 institutions contributing 3,328 cases. Overall, there was a 2.5% risk of transient neurological dysfunction following surgery and a 6% risk of stroke or death. The intra-institutional combined major morbidity and mortality varied from 21% to 0. Those institutions with greater than 700 beds had a statistically lower incidence of stroke or death than did other institutions. The incidence of stroke or death postoperatively was significantly lower for patients who were operated on for amaurosis fugax or for unspecified reasons. Those patients who were operated on for a progressing stroke had a higher incidence of stroke but this group was at greatest risk for stroke without surgery. The incidence of postoperative stroke or death was related to the type of arterial repair; vein patch grafting was statistically better than both fabric patch grafting and primary closure. When all patients who were not monitored during surgery were compared to all patients who had electroencephalographic (EEG) monitoring, there was found to be a significant statistical difference in favor of the EEG group. Endarterectomy combined with coronary artery bypass or simultaneous bilateral endarterectomies had a statistically significant higher incidence of stroke or death than did unilateral carotid endarterectomy.

Canada↗