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Biomedical subjects

W W Orrison

Publications and source records attributed to W W Orrison.

At least 73 records · Page 4Linked to original sources
PubMed1986

Clivus epidural hematoma: a case report.

An acute traumatic epidural hematoma extending from the odontoid process to the dorsum sella is described. The mechanism for the formation of an extradural hematoma in this unusual location seems to be related to age and a severe hyperflexion injury.

Brain↗
PubMed1985

Lateral atlantooccipital dislocation: case report.

A case of lateral atlantooccipital dislocation is presented, and its successful management is outlined, demonstrating the importance of the physical examination and the utilization of computed tomography. Open reduction and stabilization with direct visualization of the spinal axis is the preferred method of treatment.

Adult↗
PubMed1984

Pelvic hematoma after intercourse while on chronic anticoagulation.

A 41-year-old anticoagulated woman presented with increasing pelvic pain that had begun two days prior during intercourse. An ultrasound and computerized tomographic (CT) scan confirmed the diagnosis of pelvic hematoma. The hematoma resolved spontaneously with normalization of clotting studies. The emergency physician should consider this rare cause of pelvic pain in selected anticoagulated patients. The need for a thorough history in emergency patients is emphasized, as well as the value of ultrasound and CT scan in the diagnosis of this disorder.

Adult↗
PubMed1983

Lateral C1-2 puncture for cervical myelography. Part II: Recognition of improper injection of contrast material.

The interpretation of cervical metrizamide myelography requires specific anatomic considerations, particularly when the lateral C1-2 puncture technique is employed. Fresh unfixed cervical spine specimens were injected with a mixture of metrizamide and methylene blue. Radiologic examinations of these specimens were compared with a retrospective analysis of 100 consecutive unselected cervical myelograms obtained by lateral C1-2 puncture during the years 1979-1980. Epidural, subdural, subpial, dentate ligament, and spinal cord injections may be encountered when the lateral C1-2 puncture for myelography is employed; possible artifacts from such injection are discussed.

Humans↗
PubMed1983

Lateral C1-2 puncture for cervical myelography. Part III: Historical, anatomic, and technical considerations.

Three significantly different lateral approaches to the cervical subarachnoid space (anterior, midplane, and posterior needle positions) have been previously described for cordotomy and myelography. Experimental lateral C1-2 punctures were performed by each of these three methods in anatomic specimens, cadaver models with reconstituted cerebrospinal fluid pressures, a patient with cerebral death, and to a limited degree in patients undergoing routine cervical myelography. In the cervical region the dura is pushed ahead of the needle, forming a "tent" over the needle tip during C1-2 puncture; the needle projects several millimeters into the spinal canal before penetrating the dura, regardless of the method of entry or needle diameter. The extent of this tenting phenomenon and its relationship to the spinal cord are significantly affected by the needle diameter and position. A posterior technique for lateral C1-2 puncture is described.

Adolescent↗
PubMed1983

Reenactment of the triggering situation for the diagnosis of epilepsy.

When a fixed set of ambient circumstances is associated with convulsive or nonconvulsive paroxysmal attacks, reenactment of the situation should be considered as a possible shortcut for reaching a diagnosis. Reenactment determined the diagnosis in 30 of 32 patients with paroxysmal disorders. The referral diagnosis was correct in only 13 of the 32 patients. To be appropriately executed, the reenactment should entail polygraphic recording of at least EEG, ECG, and respiration. Vertex electrodes should be included to avoid overlooking of cortical electrodecremental event. If unsuccessful at the first attempt, reenactment should be repeated.

Adolescent↗
PubMed1982

The effect of clinical bias on the interpretation of myelography and spinal computed tomography.

Spinal computed tomograms and myelograms of 107 patients with sciatica or low back pain were interpreted with and without knowledge of clinical history. A significant number of interpretations was changed by knowledge of the clinical history. More studies were interpreted correctly without the clinical history than with it. Knowledge of the clinical history increased the number of false-positive and decreased the number of false-negative diagnoses. This study suggests a tendency of observers to interpret questionable myelographic or computed tomographic findings as positive when they correlate with clinical findings.

Adult↗
PubMed1982

Computerized tomography and rehabilitation outcome after severe head trauma.

Thirty patients with severe head trauma underwent an extensive in-hospital multidisciplinary rehabilitation program. Computerized tomographic(CT) scans were arranged into 4 distinct groups. Group 1 comprised those individuals with normal CT scans, group 2 those with small ventricles, group 3 had focal intracranial hemorrhage or mass effect, and group 4 enlarged ventricles (disproportionate to patient's age and size of cortical sulci). The outcome after a rehabilitation program was assessed by functional and psychologic criteria. Groups 1 and 2 had the best outcome, although many in these categories were left with permanent physical and psychologic disabilities. Those with focal intracranial hemorrhage did not do as well. The group with enlarged ventricles had the poorest outcome of all. Other factors relating to outcome included age, length of coma, presence of motor disabilities, seizures, and skull fractures.

Adolescent↗