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Biomedical subjects

M Hedström

Publications and source records attributed to M Hedström.

At least 19 recordsLinked to original sources
PubMed2000

Biochemical bone markers and bone density in hip fracture patients: weak correlation in 106 women.

Biochemical markers of bone formation and bone resorption were measured preoperatively, within 18 hours after a hip fracture (n 106) and bone mineral density (BMD) was measured with quantitative computer tomography (QCT), dual-energy x-ray absorptiometry (DXA) and heel ultrasound in 63 hip fracture patients. Patients with pertrochanteric fractures had more osteoporosis in all measurements than patients with femoral neck fractures. We found no differences in biochemical markers of bone formation or bone resorption in patients with femoral neck fractures and in those with pertrochanteric fractures. Correlations between biochemical bone markers and bone density, bone mass and stiffness on admission were weak.

Absorptiometry, Photon↗
PubMed1999

Urinary tract infection in patients with hip fractures.

We found that 23% of 435 patients treated for a femoral neck fracture in our department also were treated for a urinary tract infection during their hospital stay. The most common pathogen was Escherichia coli, sensitive for mecillinam in 98% of the cases. The most frequently used antimicrobial agent was a broad-spectrum antibiotic, fluoroquinolon, although the most reasonable choice would have been a non broad-spectrum agent such as mecillinam. Catheterization was not a predisposing factor for urinary tract infection, but a poor medical condition and female sex were. We did not find a higher mortality rate among patients with a urinary tract infection.

Aged↗
PubMed1999

Hip fracture patients, a group of frail elderly people with low bone mineral density, muscle mass and IGF-I levels.

Elderly women with hip fractures constitute an increasing group of patients in many western countries. The most significant of many factors contributing to the incidence of hip fractures are neuromuscular impairment and low bone mineral density (BMD). Both bone mass and muscle strength decrease during ageing as well as growth hormone (GH) and the anabolic, insulin-like growth factor I (IGF-I). We have found a lower IGF-I level and lower bone and lean body mass in hip fracture patients than in an age-matched group of patients. This sign of catabolism seems to continue postoperatively, with a significant decrease of both BMD and lean body mass possibly indicating GH/IGF-I therapy together with adequate nutrition to preserve bone and muscle losses in elderly patients with hip fractures.

Absorptiometry, Photon↗
PubMed1999

Low IGF-I levels in hip fracture patients. A comparison of 20 coxarthrotic and 23 hip fracture patients.

We measured total body bone density and body composition with dual energy x-ray absorptiometry in 43 elderly patients, 23 with hip fracture and 20 with coxarthrosis, after surgery and after 6 months. Insulin-like growth factor-1 (IGF-I), a polypeptide known to affect bone metabolism, and two of its binding proteins (IGFBP-1, IGFBP-3) were measured preoperatively and after 6 months. Normal serum IGF-I levels are dependent on adequate nutrition and normal secretion of growth hormone (GH). We found consistently lower levels of IGF-I and IGFBP-3 and a tendency to higher levels of IGFBP-1 in the patients with hip fractures, who also had a lower total body mass, lower fat mass and bone mineral density than the coxarthrosis group, indicating a more catabolic state in the patients with hip fracture, even 6 months after the trauma.

Absorptiometry, Photon↗
PubMed1999

Acute spinal epidural abscess without concurrent spondylodiscitis. Successful closed treatment in 10 cases.

We performed a retrospective survey of the clinical records and radiological examinations of 10 patients with a diagnosis of spinal epidural abscess, without spondylodiscitis. All patients had an acute onset of fever and local or radiating back pain. 3 patients had mild, and 1 patient severe neurological symptoms. The diagnosis and subsequent regression of the abscess after treatment were verified by MRI. In all cases, the imaging findings included signs of septic arthritis in an adjoining facet joint. 7/10 abscesses were located in the lumbar region. Blood cultures showed Staphylococcus aureus as the etiological agent in 8/10 patients. In 2 cases, no agent was found, probably due to ongoing antibiotic therapy when the cultures were taken. All patients were treated successfully using antibiotics alone, with complete regression of the neurological symptoms.

Abscess↗
PubMed1998

Serum albumin and deep infection in femoral neck fractures. A study of 437 cases followed for one year.

Four hundred and thirty-seven patients with femoral neck fractures were studied to determine the value of serum albumin estimations on admission. Serum albumin is a good predictor of mortality, and patients with low levels should be given additional nutritional support. We found that the serum albumin level is not useful in predicting deep wound infection. The infection rate of 3% does not justify the use of antibiotic prophylaxis in general.

Aged↗
PubMed1997

Decrease in bone mineral density and muscle mass after femoral neck fracture. A quantitative computed tomography study in 25 patients.

We performed a prospective, longitudinal, quantitative computed tomography (QCT) study of bone mineral density (BMD), cortical bone volume, bone mass and muscle volume in 25 patients who were operated on with osteosynthesis because of a displaced femoral neck fracture. Both legs were scanned within 3 days after the fracture, and 3 and 6 months after the operation. The measurements were performed by a computer tomograph equipped for bone mineral densitometry. We found some side differences among the patients at the time of fracture, but none of the differences was statistically significant. After 6 months, we found reductions in BMD in the distal femur and proximal tibia on the fractured side of 11% and 19%, respectively, as well as a reduction in BMD of 7% in the proximal tibia on the uninjured side. We found no changes in cortical bone mass, either on the fractured femur or on the uninjured femur. The muscles of the thigh showed a loss of 9% on the fractured side, but a gain of 12% on the uninjured side. The findings of a bone loss in the distal femur and proximal tibia of the fractured leg and in the proximal tibia of the healthy leg, but no cortical bone loss in the middle femur on any side 6 months after the fracture, indicate that the cancellous bone is more sensitive to osteopenia. Moreover, this bone loss is interpreted as mainly a posttraumatic effect, since we also found a decrease in bone mineral on the uninjured side, despite a gain in muscle volume on that side, an overuse which was not sufficient to counteract the posttraumatic effect on the bone of the uninjured side.

Bone Density↗
PubMed1996

Autologous blood transfusion in hip replacement. No effect on blood loss but less increase of plasminogen activator inhibitor in a randomized series of 80 patients.

80 patients underwent total hip replacement (THR) for primary coxarthrosis. In a randomized study, half of them donated 2 units of blood before operation. One unit was collected 4 weeks and one 2 weeks before the scheduled THR. All except 1 patient tolerated the predonations well. Total blood losses were similar in both groups. Additional bank blood was given in 7/38 in the predonation group, compared to 29/40 in the control group. Hemostatic parameters were studied in 10 consecutive patients in each group. Plasminogen activator inhibitor 1 (PAI-1), a possible risk parameter for thromboembolism, was significantly more increased postoperatively in the control group, which received only homologous blood. Platelet count, prothrombin complex, antithrombin III and von Willebrand factor antigen were significantly reduced and C reactive protein increased after surgery in both groups. We recommend predonation of 2 autologous units before a primary THR. In most cases, such predonation makes homologous blood transfusion unnecessary. The use of predonated blood causes no reduction of blood loss in THRs, but the increase in PAI-1 seen after homologous transfusions is avoided.

Aged↗
PubMed1994

Early postoperative ankle exercise. A study of postoperative lateral malleolar fractures.

Fifty-three patients with dislocated lateral malleolar fractures were randomly selected after operation for either active ankle movement and weight bearing in an orthosis or no ankle movement but weight bearing in a walking cast. At follow-up examinations after three, six, and 18 months, no differences were found between the groups except for a better linear analogue scale result at three months for the orthosis group. Active ankle movements do not improve the rehabilitation of surgically treated lateral malleolar fractures.

Adolescent↗
PubMed1978

Human red cell content of cyclic nucleotides and cations upon beta-adrenergic blockade.

The content of cyclic nucleotides (cAMP, cGMP) and Mg2+, Zn2+,Na+ and K+ was determined in human erythrocytes and after beta-adrenergic blockade in healthy individuals. The figures for cAMP and cGMP were 4.20 and 3.36 nmoles/ l intracellular volume, respectively. Only slight effects on the cyclic nucleotide content as well as on cation content were seen upon beta-blockade in the erythrocytes. It is concluded that the single determination of red cell cAMP is not a sufficient indicator of beta-adrenergic blockade. The determination of cAMP in combination with cGMP, Zn2+ and Na+ might reflect a beta-adrenergic blockade.

Adolescent↗
PubMed1977

Restoration of detergent-inactivated adenosine triphosphatase activity of human prostatic fluid with concanavalin A.

A stimulation by concanavalian A OF Mg2+ -and Ca2+-dependent ATPase (ATP phosphohydrolase, EC 3.6.1.3) of human prostatic fluid has been observed after the enzyme system had been inactivated by a detergent such as 0.05% deoxycholate. The concanavalin A effect was specific since the positive effect was abolished in the presence o alpha-methyl-D-mannoside. Furthermore, the positive effect of concanavalin A was obtained with a low lectin concentration, equal to the concentration reported for optimal stimulation of other membrane enzymes.

Adenosine Triphosphatases↗