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Biomedical subjects

P Sundgren

Publications and source records attributed to P Sundgren.

8 recordsLinked to original sources
PubMed1999

Paragangliomas of the spinal canal.

We report the clinical MRI and histopathological features of five consecutive cases of spinal paraganglioma. Three intradural tumours were found in the typical location (two at the L4, one at the S2 level); one intradural extramedullary tumour arose at an unusual level, from the ventral C2 root, and one extradural tumour growing along the L5 nerve root sheath had an aggressive growth pattern with early, local paraspinal recurrence and, eventually, intradural metastatic spread. This type of growth pattern has not been described previously. Paragangliomas of the spinal canal are more common than previously thought and can be located anywhere along the spine, although the lumbosacral level is the most common. Their appearance on MRI can not distinguish them from other tumours in the spinal canal. Even though paragangliomas in general are benign and slowly growing their growth pattern can vary and be more aggressive, to the point of metastatic spread.

Adult↗
PubMed1997

Remodeling of the spinal canal deformed by trauma.

Computed tomography (CT) examinations and functional scores were evaluated in 28 patients with thoracolumbar fractures with intraspinal fragments, of whom 20 underwent operation. The cross-sectional area and the sagittal and frontal diameters of the spinal canal were measured after the injury, postoperatively, and at follow-up (mean, 6 years). The operative reduction significantly increased both diameter and area of the spinal canal. During follow-up, a further significant increase of the sagittal diameter and the area was noted, in both surgically and conservatively treated patients. There was no difference in remodeling between the groups. Six patients in the surgically treated group had neurologic deficits at admission, five had improved, and one remained unchanged at follow-up. The presence or absence of intraspinal fragments should not influence the treatment strategy per se in cases without neurologic signs.

Adolescent↗
PubMed1995

CNS-effects from subarachnoid injections of iohexol and the non-ionic dimers iodixanol and iotrolan in the rabbit.

The neural tolerance of the new non-ionic dimer iodixanol was compared with that of the clinically used monomer iohexol and the dimer iotrolan. Behaviour of non-anaesthetised rabbits was monitored for 3 hours after intracisternal injection, at a dose-volume of 1 ml/kg of iodixanol 150 mg I/ml, iodixanol 320 mg I/ml, iohexol 350 mg I/ml, or iotrolan 300 mg I/ml (10 rabbits in each group). Iotrolan induced generalized seizures in 5 rabbits, iodixanol 320 mg I/ml in 2 rabbits, and iodixanol 150 mg I/ml in one rabbit. No excitative changes were observed in rabbits, iodixanol 320 mg I/ml in 2 rabbits, and iodixanol 150 mg I/ml in one rabbit. No excitative changes were observed in rabbits injected with iohexol, but compared with the dimeric contrast media the difference was not significant. Iohexol produced significantly more severe depressive changes than iodixanol 150 mg I/ml (p < 0.01), iodixanol 320 mg I/ml (p < 0.05), and iotrolan 300 mg I/ml (p < 0.05). The results indicate that the excitative neurotoxic potential of the dimer iodixanol is likely to be lower than that of the clinically used dimer iotrolan, but slightly higher than that of iohexol. It may be expected that both dimers will produce a lower frequency of minor neurological adverse reactions than iohexol.

Akathisia, Drug-Induced↗
PubMed1995

Neural tolerance of the non-ionic dimers iodixanol and iotrolan and the non-ionic monomer iopamidol during myelography in non-anaesthetised rabbits.

PURPOSE: The neural tolerance of the recently introduced dimer iodixanol (320 g I/l) was compared with that of the dimer iotrolan (300 g I/l) and of the monomer iopamidol (300 g I/l), both used in clinical myelography. MATERIAL AND METHODS: Non-anaesthetised rabbits were injected into the cisterna magna with Ringer's solution (control) or contrast media (CM) at doses of 1.0 or 0.5 ml/kg b.w. The behaviour of the animals (10 in each of 7 groups) was evaluated for signs of excitation and depression during the first 3 hours after injection. RESULTS: At the dose level of 1.0 ml/kg b.w., iodixanol produced no seizures but did cause focal twitching in 4/10 rabbits. Iopamidol produced grand mal seizures in 2/10 and hyperexcitability in 4/10 rabbits. Iotrolan produced generalised grand mal seizures in 8/10 rabbits, an incidence of excitation significantly greater than that of iodixanol (p < 0.01) and iopamidol (p < 0.05). The excitative effects of iodixanol were not significantly different from those of iopamidol and Ringer's solution. All 3 CM produced similar depressive effects on rabbit behaviour. Ringer's solution caused no depressive effects (p < 0.01). A clear dose response was produced with all 3 CM after treatment with a lower dose of 0.5 ml/kg b.w. CONCLUSION: The results indicate that the neural tolerance in the rabbit of iodixanol is higher than that of iotrolan, and is at least equal to that of iopamidol.

Animals↗
PubMed1995

Adverse reactions in myelography.

An attempt was made to assess the usefulness of using animal models to predict the neural tolerability in man of iodinated contrast media (CM) in general, and of the new nonionic dimer iodixanol in particular. For this purpose, the results from 6 animal experiments evaluating excitative and depressive effects of subarachnoidally injected CM in nonanesthetized rabbits were compared with the results from 22 randomized double-blind clinical trials dealing with post-myelographic adverse reactions. Comparisons were made as regards the nonionic monomers metrizamide, iohexol, and iopamidol, and the dimer iotrolan. The results seem to justify the conclusion that the convulsive effects of CM can be reliably predicted from animal experiments. The animal model cannot be used to predict specific types of nonconclusive adverse reactions in man, but reflects well the differences in frequencies of minor reactions following clinical myelography with different nonionic CM. In general, the neural tolerability of iodixanol may be expected to be better than that of the nonionic monomers and approximately equal to that of iotrolan.

Animals↗
PubMed1994

Immigration and socio-economy as predictors of early retirement pensions.

The purpose of this study, performed in a Swedish municipality, was to obtain a view of early retirement pensioners, focusing on immigration and socio-economy as predictors of early retirement pensions. A questionnaire was sent to 453 early retirement pensioners with disorders of the musculoskeletal system. A corresponding questionnaire was sent to a randomly selected, age- and sex-matched control group of the same size. The response rate was 83%. The study concludes that immigration and low socio-economy are predictors of early retirement pension (ERP). The rate of immigrants was 19% among the ERPs compared to 5% among the controls. The early retired immigrants were comparatively young, and some of them were overqualified for their previous jobs. Of the ERPs 74% were blue-collar workers compared to 39% of the controls. Neither work satisfaction nor unemployment was found to predict ERP.

Adult↗
PubMed1993

Elevation of the larynx on normal and abnormal cineradiogram.

The relationship between bolus volume (2.5, 5, 10 and 20 ml) and larynx elevation during swallowing was assessed in 10 non-dysphagic and 10 dysphagic individuals without pharyngeal dysfunction. Laryngeal elevation in different types of pharyngeal dysfunction was assessed in 60 non-dysphagic and 75 dysphagic patients. All subjects were examined with liquid barium and cineradiography at 50 frames/s. The laryngeal elevation was measured at the moment when the bolus reached the level of the valleculae and at maximum elevation. Elevation of the larynx, both the initial and maximal, was not influenced by sex, age or presence of dysphagia. Elevation of the larynx at the moment when the bolus reached the valleculae, when expressed in per cent of maximum elevation, was lower with 10 and 20 ml bolus volumes compared with 2.5 ml bolus volume (p < 0.05) in the 10 dysphagic individuals. Pharyngeal dysfunction was associated with significantly lower initial elevation of the larynx, at the moment when the bolus reached the level of the valleculae, although the maximal laryngeal elevation was normal. Initial elevation was 30% lower (p = 0.03) in patients with aspiration of bolus material into the trachea, 22% lower (p = 0.007) in those with defective closure of the laryngeal vestibule without aspiration and 16% lower (p = 0.06) in those with incoordination of the cricopharyngeal muscle compared with patients without dysfunction.

Adolescent↗