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Biomedical subjects

J Browder

Publications and source records attributed to J Browder.

At least 19 recordsLinked to original sources
PubMed1987

Carbon dioxide retention associated with a humidifier defect.

A case is presented which describes a patient who developed hypercarbia resulting from a defective humidifier. A Puritan-Bennett Cascade I humidifier was incorporated into a circle system between the inspiratory dome one way valve and the patient. A screw which supports the thermal well to the head of the humidifier was missing, thereby allowing an intermittent leak to develop in the system. The leak was present when the system pressure dropped to ambient level; however, at positive system pressure the leak sealed. This allowed exhaled gases into the inspiratory limb of the circuit unchecked by the inspiratory valve yet when the breathing circuit was occluded at the patient end and submitted to pressures of 20 and 40 cm H2O, no leaks were detected. Intraoperatively, PaCO2 was noted to be as high as 68 mmHg just prior to removing the humidifier from the circuit and corrected to 38 mmHg within 15 minutes of removal of the humidifier.

Adult↗
PubMed1976

Anatomical features of the straight sinus and its tributaries.

The authors report a variety of arrangements of the venous channels comprising the straight sinus (sinus rectus) and its connections during a continuing study of the cerebral sinuses and their tributaries. In approximately 85% of 131 specimens of dura mater with enclosed venous sinuses derived from fresh cadavers, the straight sinus was represented by a single midline tentorial channel whereas in the remaining 15%, segments of it were doubled and in a few, tripled. In addition to these aberrations in the development of the main trunk of this sinus, the venous patterns at the junctions of the inferior sagittal sinus, vein of Galen and straight sinus showed comparable developmental inconstancies. Also in no specimens were the patterns of venous channels in the leaves of the tentorium cerebelli alike. The course, size, and connections of all the tributaries of the straight sinus have been studied and consideration given to their potentials as collateral pathways in the event either the vein of Galen or the straight sinus itself were occluded.

Adult↗
PubMed1976

Aneurysm of a superior cerebral vein.

Among 880 specimens of cerebral dura mater with enclosed sinuses, one had a sharply delineated bulbous conformation of the distal segment of a superior cerebral vein. There was no evidence of an arteriovenous malformation. Early plaque formation was present in the inner aspect of the thick wall of the dilated segment of vein.

Brain↗
PubMed1975

Venous channels within the intracranial dural partitions.

Complete dura maters exclusive of their midline basilar attachments were obtained by autopsy from persons of all age groups. Vinylite casts of the venous channels in the diaphragma sellae, falx cerebelli, falx cerebri, and tentorium cerebelli were made by injecting a mixture of Vinylite and acetone, after which the specimens were fixed in formalin and subsequently corroded with concentrated hydrochloric acid. Studies showed that the size and position of the channels within the diaphragma sellae were quite constant. Large venous lakes were present in the falx cerebelli and contiguous suboccipital dura mater, and venous pools were also seen connecting the caudal end of the inferior sagittal sinus and the superior sagittal sinus. A great variety of channels were observed in the tentorium cerebelli.

Adolescent↗
PubMed1975

Venous channels in the tentorium cerebelli: surgical significance.

A practical surgical approach for exposure of the rostral part of the cerebellum is by way of an occipital craniectomy and incision through a leaf of the tentorium cerebelli. Venous channels of variable dimensions course in this intracranial dural process or partition. Neurosurgeons should be aware of their presence.

Adult↗
PubMed1975

Letter: Neurosurgery.

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Education, Medical, Undergraduate↗
PubMed1975

Venous lakes in the suboccipital dura mater and falx cerebelli of infants: surgical significance.

At birth, 25% of infants have relatively large venous channels coursing in the mid-line of the suboccipital dura mater. They connect the confluence of sinuses with the marginal sinuses. These are limited to the midline suboccipital dura mater in some, whereas in others they implicate the contiguous falx cerebelli as well. These fetal channels gradually shrink, dwindle, or otherwise disappear, and are absent in adolescents and adults. When performing a bilateral suboccipital craniectomy on an infant, one usually divides these venous channels. This may present technical difficulties. Vinylite casts have been made of a series of occipital sinuses. These demonstrated the size, variations, course, and connections of the occipital sinuses and these venous pathways.

Adult↗