Biomedical subjects

Magnus Hallén

Publications and source records attributed to Magnus Hallén.

5 recordsLinked to original sources

PubMed2003

Partial splenic embolization: long-term outcome.

BACKGROUND: Partial splenic embolization (PSE) was introduced in the 1980s. We studied the long-term follow-up results of a PSE-treated patient cohort. PATIENTS AND METHODS: Twenty-six severely ill patients (median age 63.5 years) were treated with a graded PSE a total of 52 times, mainly due to bleeding esophageal varices and thrombocytopenia. The aggregated follow-up time was 1715 months. RESULTS: The mean values of hemoglobin, leukocytes and thrombocytes increased significantly after PSE. The frequency of bleeding episodes from esophageal varices was significantly reduced. No effect was observed concerning blood liver parameters in cirrhotic patients. The integrated PSE effect was judged as improvement in 19 patients, status quo in 5, and deterioration in 2. Median survival time was 50.5 months (range 0.5-272 months). Two patients underwent liver transplantation. Complications consisted mainly of fever, atelectasis, and abdominal pain. Two patients died of PSE-related complications. CONCLUSIONS: A standardized and graded PSE is reasonably safe even in patients with advanced disease in whom it is hazardous to splenectomize. It gives a long-term effect on the hematological parameters, bleedings from esophageal varices and good palliation, and improved clinical status contributing to symptomatic control.

Adult↗

PubMed2003

Laparoscopic extraperitoneal inguinal hernia repair versus open mesh repair: a prospective randomized controlled trial.

BACKGROUND: This study was designed to compare an open tension-free technique (Lichtenstein repair) with a laparoscopic totally extraperitoneal hernia repair (TEP). METHODS: One hundred sixty-eight men aged 30 to 65 years with primary or recurrent inguinal hernia were randomized to TEP or open mesh technique in the manner of Lichtenstein. Follow-up was after 1 and 6 weeks, and 1 year. RESULTS: Eighty-one patients were randomized to TEP, and 87 to open repair. For 1 patient in each group, the operation was converted to a different type of repair. No difference was seen in overall complications between the 2 groups. However, 1 patient in the TEP group underwent operation for small bowel obstruction after surgery. A higher frequency of postoperative hematomas was seen in the open group (P <.05). Patients in the TEP group consumed less analgesic after surgery (P <.001), returned to work earlier (P <.01), and had a shorter time to full recovery (P <.01). Two recurrences occurred in the TEP group 1 year after surgery. CONCLUSION: The TEP technique was associated with less postoperative pain, a shorter time to full recovery, and an earlier return to work compared with the open tension-free repair. No difference was seen in overall complications. However, 2 recurrences did occur after 1 year in the TEP group.

Adult↗

PubMed2002

Cytogenetic abnormalities in a hemangiopericytoma of the spleen.

To date, only 16 cytogenetically abnormal hemangiopericytomas (HP) have been reported. Despite this low number, some characteristic karyotypic features have already emerged: most HP are near-diploid and breakpoints in 12q13, 12q24, and 19q13 seem to be common, with t(12;19)(q13;q13) being a recurrent translocation. Here, we report the first case of a probably benign splenic HP with chromosomal abnormalities. The abnormal karyotype was 47,XX,t(5;22;11)(q31;q11;q13),+10. None of these abnormalities have previously been reported in HP, suggesting that the karyotypic pattern of splenic HP may differ from soft tissue HP.

Chromosome Aberrations↗

PubMed2002

Hypersensitivity to noradrenaline in human omental vein but not artery isolated from a patient with idiopathic orthostatic hypotension.

We investigated the smooth muscle contraction in response to noradrenaline (NA), endothelin-1 (ET) and 5-hydroxytryptamine (5-HT) in the omental artery and vein segments from a 67-year-old woman with idiopathic orthostatic hypotension. The blood vessels were obtained during the abdominal surgery and investigated in vitro. Noradrenaline, endothelin-1 and 5-hydroxytryptamine all induced a contraction in the artery and vein segments. Compared to the literature, the sensitivity to noradrenaline was 10 times higher than expected in the vein. In the artery, the sensitivity to noradrenaline and in both the artery and vein, the sensitivity to endothelin-1 and 5-hydroxytryptamine was similar to that reported in the literature. These results suggest that the patient had developed an isolated hypersensitivity to noradrenaline in the veins, probably due to an impairment of the sympathetic activity.

Age Factors↗

PubMed2002

Cytogenetic aberrations and heterogeneity of mutations in repeat-containing genes in a colon carcinoma from a patient with hereditary nonpolyposis colorectal cancer.

The majority of tumors from patients affected by hereditary nonpolyposis colorectal cancer (HNPCC) exhibit a mutator phenotype characterized by widespread microsatellite instability (MSI) and somatic mutations in repeated sequences in several cancer-associated genes. An inverse relationship between MSI and chromosomal instability (CIN) has been demonstrated and HNPCC-associated tumors are generally characterized by diploid or near-diploid cells with few or no chromosomal rearrangements. We have studied MSI, somatic mutations in repeat-containing genes, DNA-ploidy, and cytogenetic aberrations in a colon carcinoma from a patient with a germline MLH1 mutation. Mutations in coding repeats were assessed in 10 macroscopically separate areas of the primary tumor and in two lymph nodes. Some of the genes studied (E2F4, MSH3, MSH6, TCF4, and TGFBRII) showed a consistent lack of mutations, whereas others (BAX, Caspase-5 and IGFIIR) displayed alterations in some tumor regions but not in others. The tumor had DNA-index 1.1-1.2 and a stable, aberrant karyotype with extra copies of chromosomes 7 and 12 and the structural aberrations i(1q), der(20)t(8;20), and der(22)t(1;22). The finding of CIN, MSI, and somatic mutations in coding repeats in this tumor suggests that these phenomena may act together in HNPCC tumorigenesis. Furthermore, the observed intratumoral heterogeneity of mutations in coding repeats implies these changes occur late in tumorigenesis and, thus, probably play a role in tumor progression rather than initiation.

Adaptor Proteins, Signal Transducing↗