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Biomedical subjects

S L Ylinen

Publications and source records attributed to S L Ylinen.

5 recordsLinked to original sources
PubMed1991

The "whisker sign" as an indicator of ochronosis in skeletal scintigraphy.

A patient with alkaptonuria and ochronotic arthrosis was imaged twice with technetium-99m dicarboxypropane diphosphonate (99mTc-DPD)--once during a bout of arthritic knee pain and once when symptom-free. There was a marked accumulation of radioactivity in the large joints. During the episode of arthritis the knee joints had a higher uptake than when the patient was without symptoms. The intervertebral discs showed a high uptake which extended laterally from the axial vertebral column; the finding gave an impression of whiskers, and this "whisker sign" may be characteristic of ochronosis.

Alkaptonuria↗
PubMed1990

Prevention and dispersion of contrast media induced red cell aggregates. An in vitro study.

Red cell aggregation was observed microscopically when human blood and contrast media were mixed on glass slides. Aggregation was more frequent in low-osmolal media: mainly rouleaux were formed in ioxaglate but irregular aggregates in non-ionic media. Aggregation was similar at concentrations of 150 and 300 mg I/ml. Pre-treatment of glass slides with heparinized saline reduced red cell aggregation but saline alone was almost as effective. Most of the irregular aggregates dispersed when saline or heparinized saline was applied to them. Saline and heparinized saline had an identical dispersing effect. After incubation of the aggregates in iopamidol in plastic tubes for one or five minutes, saline was injected into the tubes, and after mixing the solution was poured onto glass slides and examined under the microscope. Only a few small irregular aggregates were detected in 6/60 specimens. It is concluded that ionicity of a flushing medium and shear of the injection are able to disperse red cell aggregates during angiography.

Contrast Media↗
PubMedDate not supplied

Effect of ionic and non-ionic contrast media on aggregation of red blood cells in vitro. A preliminary report.

Fresh human blood without additives, and contrast medium were mixed and examined immediately by light microscopy in a non-flowing state. Sodium meglumine diatrizoate, meglumine diatrizoate, meglumine iodamide, sodium meglumine ioxaglate, iopromide, iopamidol, iohexol, and metrizamide were tested in concentrations of 300 mg I/ml. Physiologic saline and 5% glucose were used as controls. All media were tested in a randomized order with blood samples from 23 volunteers. No aggregation was detected in physiologic saline, and few rouleaux were found in ionic contrast media. Irregular red cell aggregates were found in all low-osmolal contrast media: in 17 per cent of the specimens in ioxaglate, in 52 per cent in metrizamide, and in 78 to 100 per cent in other non-ionic media. Irregular aggregates were seen in all specimens with glucose. It remains to be demonstrated whether or not the irregular aggregation of human red cells in non-ionic contrast media has clinical significance. Iohexol was also tested with blood samples from several laboratory animals, but in nearly every case no aggregates were found. Results of animal experiments or tests with animal blood seem to be poorly applicable to man.

Animals↗