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Biomedical subjects

P A Magnusson

Publications and source records attributed to P A Magnusson.

3 recordsLinked to original sources
PubMed1990

Control of bleeding in cemented arthroplasty.

Bleeding from cancellous bone causes lamination within bone cement and at its prosthetic interfaces, and weakens the fixation of joint replacements. We examined the effects of anaesthesia and blood pressure on bleeding in human cancellous bone, and investigated the local response to freezing saline, 1:200,000 adrenaline and hydrogen peroxide. Spinal anaesthesia reduced cancellous bleeding by an average of 44%, local freezing saline by 24%. Saline at room temperature, adrenaline solution and hydrogen peroxide each reduced it by 14%. The effects of spinal anaesthesia and of freezing saline were additive: used together they reduced bleeding by 56%. The reduction of blood contamination of cement and its interfaces should contribute to better prosthetic fixation.

Anesthesia, Conduction↗
PubMed1977

Psychogenic vertigo within an anxiety frame of reference: an experimental study.

The theoretical point of departure here was the assumption that a psychogenic vertigo patient displaces affect, or experience of anxiety to one of dizziness, the dizziness serving as an anxiety equivalent. This is seen to imply a change in the locus of experience from the me to the not-me sphere. "Percept-genetic" techniques and a spiral after-effect measurement were used to compare 23 patients with presumed psychogenic vertigo with a control group matched in sex, age, education and occupation. Results of the percept-genetic techniques showed the patients to display stronger signs of affect anxiety than subjects in the control group. Also two main subgroups of patients were differentiated with the help of the descriptive instruments, one group with signs of a primitive-hysteroid mode of functioning, the other with signs of an obsessive-compulsive mode. For both subgroups the suggested displacement mechanism seemed to be functioning. Its apparent effect differed, however, for the two subgroups: in the "primitive-hysteroid" group the displacement mechanism was more effective. The "obsessive-compulsive" group showed stronger signs of affect anxiety, dizziness here being better characterized as a concomitant than as an equivalent of anxiety. Results of a follow-up two years after the investigation also showed a poorer development of symptoms within the "obsessive-compulsive" group.

Adult↗