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Biomedical subjects

L Jacobsson

Publications and source records attributed to L Jacobsson.

At least 109 records · Page 6Linked to original sources
PubMed1996

Radiopharmaceutical dosage of 99Tcm-HMPAO for cerebral blood flow SPET studies in children.

Four methods of calculating the activity of 99Tcm-hexamethylpropyleneamine oxime to be administered in cerebral blood flow investigations of children were evaluated in patient studies. Three of the methods were based on the size of the child. We also constructed a theoretical dosage model based on physiological data and attenuation effects. The aim of the study was to find a dosage calculation method that gave the same image quality for children of all ages as well as for adults. The results showed that the dosage method based on body weight is the only one of the four methods that does not exhibit an age-dependent variation in image quality and therefore this method is recommended.

Adolescent↗
PubMed1996

Practices and attitudes among Swedish psychiatrists regarding the ethics of compulsory treatment.

Few empirical studies have examined the attitudes and ethical beliefs of psychiatrists. In this study, 328 members of the Swedish Psychiatric Association were randomly selected to respond to a questionnaire containing three clinical vignettes examining involuntary hospitalization, other compulsory interventions, and restraint. The questionnaire also contained 16 controversial statements and items on the abuse of psychiatry. A 60% response rate was obtained. Psychiatrists' responses were influenced not only by the severity of and risks associated with the patient's disorder, but also by family pressure which affected the decision-making process. Female psychiatrists less often suggested the use of physical restraints and the compulsory use of ECT. Sexual misconduct, and also the inadequate treatment of refugees, were the most frequently reported forms of abuse of psychiatry.

Adult↗
PubMed1996

Clinical cancer research--some aspects on doctors' attitudes to informing participants.

With the aim to investigate the information policy of oncologists when recruiting patients for clinical trials a postal questionnaire was sent to 412 members of the Swedish Society of Oncology (response rate 74%). Depending on the situation, 20-40% of the doctors perceive that randomization before consent is an acceptable procedure. A majority of the physicians maintain that cancer patients are able to cope with adequate information but 45% of the doctors fear that the patients may withdraw from participating if they are adequately informed. It seems to be important to study the relationship between the quality of information given to participants and the motives they have for accepting or declining to participate.

Attitude↗
PubMed1996

The immunoregulatory mediator macrophage migration inhibitory factor (MIF) catalyzes a tautomerization reaction.

BACKGROUND: Recent studies of melanin biosynthesis have uncovered an unusual enzymatic activity which converts the non-naturally occurring D-isomer of 2-carboxy-2,3-dihydroindole-5,6-quinone (dopachrome) into 5,6-dihydroxyindole-2-carboxylic acid (DHICA). The aim of the present investigation was to isolate and characterize the enzyme catalyzing this tautomerization reaction. MATERIALS AND METHODS: After we performed a tissue survey of D-dopachrome tautomerase activity, 10 bovine lenses were homogenized and used as a source of enzyme. A soluble fraction was obtained by high-speed centrifugation and subjected to successive FPLC chromatography on Phenyl-sepharose, Mono S cation-exchange, and Superdex gel-filtration. The isolated enzyme was electrophoresed, blotted onto PVDF membrane, and the N terminus analyzed by gas phase micro-sequencing. RESULTS: The protein catalyzing the conversion of D-dopachrome to DHICA was purified to homogeneity in 14% yield and showed a molecular weight of 12 kD when analyzed by SDS-PAGE. The first 27 amino acid residues of this protein were sequenced and found to be identical with those of bovine macrophage migration inhibitory factor (MIF). The catalytic activity of native MIF was confirmed by studies of purified recombinant human MIF, which showed the same tautomerase activity. While L-dopachrome was not a substrate for this reaction, the methyl esters of the L- and D-isomers were found to be better substrates for MIF than D-dopachrome. CONCLUSIONS: MIF has been described recently to be an anterior pituitary hormone and to be released from immune cells stimulated by low concentrations of glucocorticoids. Once secreted, MIF acts to control, or counter-regulate, the immunosuppressive effects of glucocorticoids on the immune system. Although the tested substrate, D-dopachrome, does not occur naturally, the observation that MIF has tautomerase activity suggests that MIF may mediate its biological effects by an enzymatic reaction. These data also offer a potential approach for the design of small molecule pharmacological inhibitors of MIF that may modulate its potent immunoregulatory effects in vivo.

Amino Acid Sequence↗
PubMed1995

The chemical nature, purity and stability of 99mTc-N-(2,6-Diethyl-3-iodo-phenylcarbamoylmethyl)-iminodiacetic acid.

The chemical purity and stability of a radio pharmaceutical 99mTc-N-(2,6-diethyl-3-iodo-phenylcarbamoylmethyl)-iminodiacetic acid (IODIDA) has been studied using HPLC. The HPLC results indicate that IODIDA decomposed into at least three species after 99mTc labelling, and the amount of these varied with time. Mass spectra obtained by negative ion FABMS of no-carrier-added (NCA) Tc-labelled IODIDA showed, in addition to the molecular ion and the sodium adduct of N-(2,6-diethyl-3-iodo-phenylcarbamoylmethyl)-iminodiacetic acid, peaks corresponding to sodium containing dimers, trimers and tetramers. Several peaks were also found that may be assigned to 99Tc(I) containing dimers, trimers and tetramers.

Chromatography, High Pressure Liquid↗
PubMed1995

Is treatment in groups a useful alternative for psychiatry in low-income countries? An evaluation of a psychiatric outpatient unit in Nicaragua.

Centro de Atención Psicosocial in León, Nicaragua is a psychiatric outpatient unit that has developed a group-oriented model of working, in which 80% of all visits are in groups: first-admission groups, insight-oriented group psychotherapy, psycho-educative, family groups and relatives groups. The aim of the present study was to analyze patient characteristics and make a preliminary study of improvement, compliance and patient satisfaction in a 1-year perspective. One hundred consecutive visits were assessed, 44 of them first admissions. They were assessed according to all axes of DSM-III-R plus the Structural Clinical Interview for DSM-III Disorders. A 1-year follow up was conducted on 39 of 41 selected patients within the major diagnostic groups. One of 4 patients had a psychotic disorder where schizophrenia dominated. Among nonpsychotics major depression, anxiety and adjustment disorders were most frequent. Personality disorders were common (80%) among nonpsychotic patients, paranoid, obsessive-compulsive, passive-aggressive and masochistic personality disorders dominating. The illiteracy rate was 10%, but 50% had high school or university background. Severity of mental disorders and functional level did not differ between educational levels. There was a strong male dominance in all diagnostic, socioeconomic and educational level strata and few old patients. Improvement in functional level was clinically and statistically significant in all groups, and more than two thirds were very satisfied with the group treatment offered.

Activities of Daily Living↗
PubMed1995

Hepatocyte and Kupffer cell function after liver transplantation in the rat--in vivo evaluation with dynamic scintigraphy.

In vivo physiological measurements of hepatocyte and Kupffer cell function after liver transplantation are desirable. Orthotopic liver transplantation was performed in 54 rats. Hepatocyte and Kupffer cell function were measured with dynamic liver scintigraphy. Hepatic clearance of 99mTc-Nanocoll (%/min), an albumin colloid phagocytosed by the Kupffer cells, was used to evaluate Kupffer cell function. Hepatic clearance of 99mTc-IODIDA (%/min), an imino-diacetic-acid taken up and secreted by the hepatocytes, was used to evaluate the hepatocyte function. Hepatic clearance in control rats was 27 +/- 2%/min for Nanocoll and 30 +/- 3 %/min for IODIDA. After syngenic liver transplantation, without rejection, there was a rise in Nanocoll clearance (34 +/- 2 %/min p < 0.01) after 3 weeks, but no change in IODIDA clearance (32 +/- 3 %/min N.S.). After syngenic liver transplantation with preservation time prolonged to 16 h, there were no changes in IODIDA or Nanocoll clearance 1 day after transplantation. Both IODIDA (11 +/- 2 %/min) and Nanocoll clearance (22 +/- 2 %/min) were decreased (p < 0.001) during rejection after allogenic transplantation. An in vivo method of measuring the hepatocyte and Kupffer cell function in the transplanted liver is described. Kupffer cell function was increased after syngenic liver transplantation. Kupffer cell and hepatocyte function were decreased during rejection. Dynamic liver scintigraphy seems a suitable procedure for examining liver injury after liver transplantation in the experimental setting.

Alanine Transaminase↗
PubMed1995

Experiences of the male partner in cervical and endometrial cancer--a prospective interview study.

This article focuses on social, psychological and sexual experiences of 47 men before their partner was treated for cervical or endometrial cancer and 1 year later. As a complement to the interviews the men completed a symptom check-list. Before initiation of treatment, a great majority of the men were in psychological crisis. The number of psychological symptoms decreased from the first to the last interview. Symptoms with psychosomatic character increased, however, considerably. In the endometrial group, several had intrapsychic problems, while interpersonal problems were more common in the cervical group. Both groups found it difficult to know how to behave and how to communicate with their partner, friends and acquaintances. A majority had nobody to whom they could speak honestly, and most did not obtain basic information about their partner's disease. The experiences of intercourse were much more negative after completed treatment and a majority described impaired sexual desire. Provided that the woman herself desires it, the coping and rehabilitation of the woman, the man and the couple would improve if the male were integrated in the care program from the moment the diagnosis of cancer is made.

Adaptation, Psychological↗