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Biomedical subjects

T Wikström

Publications and source records attributed to T Wikström.

At least 19 recordsLinked to original sources
PubMed2001

Cardiovascular injuries associated with sternal fractures.

OBJECTIVE: To find out if the presence of a sternal fracture indicates cardiac and aortic injuries and to clarify the difference between a retrosternal haematoma and widened mediastinum. DESIGN: Retrospective study. SETTING: Teaching hospital, Sweden. SUBJECTS: 418 patients with blunt chest trauma of whom 29 had a fractured sternum (11 with retrosternal haematoma and 18 without) and 389 did not (7 with widened mediastinum and 382 without). MAIN OUTCOME MEASURES: Definitions, risk factors, morbidity, and mortality. RESULTS: Retrosternal haematomas were found adjacent to many fractures and ranged in size from a few mm to 2 cm. They were more common in fractures of the body of sternum. There was no significant difference in the number of associated lesions between patients with sternal fractures with or without a retrosternal haematoma. Conversely, patients with a widened mediastinum had a higher injury severity score, longer hospital stay (p < 0.0001), and more associated lesions (p < 0.05) than those with retrosternal haematomas. Six patients still had pain 1 month after injury of whom two had injury-related long-term disability because of pain. No serious cardiac or aortic injuries were detected in this series. The early mortality in our study was 2/29 in patients with sternal fractures and 1/7 in patients with widened mediastinum. CONCLUSIONS: Sternal fractures are more common than previously reported. An aggressive approach including early operative reduction is recommended even for a stable fracture to reduce the overhelming pain. Sternal fracture with or without retrosternal heamatoma is not a reliable indicator of cardiac and aortic injuries, while mediastinal widening is still a fairly reliable clue that should indicate further investigation.

Adult↗
PubMed2001

Thoracic vascular injuries: a major problem in trauma.

OBJECTIVE: We present a review of our experience in the management of thoracic vascular injuries during the past 10 years in one of Sweden's busiest emergency departments, with morbidity and mortality as the main outcome measures. DESIGN: Of eight patients who sustained chest trauma with thoracic vascular injuries, six presented with shock. Angiography was the gold standard in diagnosing aortic and subclavian injuries. RESULTS: Lesions of the inferior vena cava, left internal mammary artery, and intercostal vessels were detected only at surgery. Two patients died of exsanguination. Managing thoracic vascular injuries is still difficult and challenging for thoracic and trauma surgeons. CONCLUSION: Early thoracotomy is important for salvage of patients with chest-wall vascular injury. Despite our limited experience, which is characteristic for Scandinavian and European countries, our results were satisfactory.

Adult↗
PubMed2000

Cardiac injuries: a ten-year experience.

OBJECTIVE: To present our experience of cardiac injuries treated at one Swedish emergency department in the 10 years 1988-97. DESIGN: Retrospective study. SETTING: Teaching hospital. SUBJECTS: 11 patients (9 men and 2 women, mean age 33 years, range 19-54); in 7 they were penetrating injuries and in 4 blunt. MAIN OUTCOME MEASURES: Morbidity and mortality. RESULTS: The mechanisms of injury were stab wound (n = 7), and car crash, fall, boat crash, and abuse (n = 1 each); drug or alcohol misuse played a part in all those with penetrating injuries. The penetrating wounds involved the left ventricle (n = 3), the right ventricle (n = 2), and the pericardium (n = 2). All 5 patients with ventricular wounds presented with cardiac tamponade, in 1 of whom it was fatal (he bled to death during emergency thoracotomy). The main complications were anoxic brain damage and postpericardiotomy syndrome (1 each). There was no case of myocardial concussion. CONCLUSION: Our data reflect the Swedish experience of heart trauma: there are few cases, alcohol and drug misuse is the principal risk factor, and there were no gunshot wounds.

Adult↗
PubMed2000

Outcome of lung trauma.

OBJECTIVE: To find out whether we could manage critical pulmonary haemorrhages in penetrating injuries, and to report our experience with blunt trauma of the lung. DESIGN: Retrospective study. SETTING: Teaching hospital, Sweden. SUBJECTS: 81 patients who presented with pulmonary injuries during the period January 1988-December 1997; 6 were penetrating and 75 blunt. RESULTS: There was only one patient with an isolated lung contusion. The remaining was divided into 2 groups: those with pulmonary contusion and thoracic lesions (n = 32), and those with pulmonary contusion and extrathoracic lesions (n = 42). Four patients in the penetrating group were shocked and required urgent operations; emergency room thoracotomy (n = 1), urgent thoracotomy (n = 2), and urgent thoracoabdominal exploration (n = 1) were done successfully. We correlated grade of lung injury [American Association for the Surgery of Trauma-Abbreviated Injury Scale (AIS)] with mortality. All patients with penetrating injuries survived without serious consequences. There were a mean (SD), of 6 (2) injuries/patient in those with extrathoracic injuries compared with 3 (1) injuries/patient in the group with thoracic lesions (p < 0.001). The corresponding hospital mortality was 6/42 (19%) mainly as a result of the central nervous system lesions (4/6) compared with 0/32. The mean (SD) Injury Severity Score (ISS) was 9.3 (4.8) in patients with thoracic lesions compared with 24.1 (14.7) in patients with extrathoracic lesions (p < 0.0001), and 14.9 (9.5) in all survivors compared with 49.9 (13.6) among those who died (p < 0.0001). CONCLUSIONS: An excellent outcome can be achieved managing penetrating injuries of the lung by an aggressive approach and urgent surgical intervention even when emergency room thoracotomy is essential. Pulmonary contusion is considered to be a relatively benign lesion that does not add to the morbidity or mortality in patients with blunt chest trauma. These data may help to decrease the obsession with pulmonary contusion in patients with chest trauma, with or without extrathoracic lesions, and avoid many unnecessary computed tomograms of the chest.

Adult↗
PubMed2000

Nomenclature, classification, and signficance of traumatic extrapleural hematoma.

BACKGROUND: Extrapleural hematoma has been found mostly in single case reports as diagnoses with different names. Although huge extrapleural hematoma can cause ventilatory and circulatory disturbances and even death, it has received almost no attention in the literature. Certain basic and modern facts need to be clarified regarding the definition, classification, and significance of extrapleural hematoma in the practice of chest trauma. METHODS: A 10-year retrospective study was undertaken to analyze the incidence, diagnosis, management, morbidity, and mortality of patients with chest trauma and a documented extrapleural hematoma. RESULTS: The incidence of traumatic extrapleural hematoma was 34 of 477, 7.1%. The incidence of thoracic lesions was 86 of 34 = 2.5 lesions per patient, whereas the incidence of extrathoracic lesions was 30 of 34 = 0.9 lesions per patient. Associated rib fractures were found in 30 of 34, 88.2%. More than half of the patients had an associated hemothorax. A thoracotomy was used successfully to remove a huge hematoma in one patient. CONCLUSION: Extrapleural hematoma has been found to be more common than previously reported. Nomenclature and classification are suggested. One of the common injuries to the chest, particularly rib fracture, hemothorax, lung contusion, or pneumothorax might provide the surgeon with a reliable clinical clue that the patient is at inordinate risk to have associated extrapleural hematoma. A formal or mini-thoracotomy is the recommended procedure in cases of huge hematomas.

Adult↗
PubMed1999

Effects of hyperbaric oxygen treatment on neutrophil activation and pulmonary sequestration in intestinal ischemia-reperfusion in rats.

Treatment with hyperbaric oxygen (HBO) has shown promising results in some models of ischemia, the major effect being a reduction in the local ischemic damage. The present study investigated the effects of HBO treatment on neutrophil activation and leukosequestration during reperfusion following intestinal ischemia in a rat model. The superior mesenteric artery was clamped for 2 h and subsequently reperfused for 90 min. One group of male Sprague-Dawley rats (n = 9) was given HBO and another group (n = 9) served as controls. Prior to ischemia, leukocytes and erythrocytes were separated, radiolabelled with 111ln and 51Cr, respectively, and reinfused. Leukocyte transit factor, the ratio between the mean passage time of leukocytes and erythrocytes was used to quantitate leukosequestration and the fraction of circulating, spontaneously nitroblue tetrazolium (NBT)-reducing neutrophils was used to measure the degree of neutrophil preactivation. HBO treatment reduced the level of leukocyte pooling significantly, especially in the lungs but also, to a minor degree, in the systemic vascular bed. The percentage of NBT-positive cells increased in all animals after reperfusion, but the increase was significantly reduced by HBO treatment. In conclusion, HBO treatment reduces leukosequestration and neutrophil preactivation following intestinal ischemia-reperfusion.

Animals↗
PubMed1998

[A patient with aortic dissection and abdominal aortic aneurysm with fistula].

Aneurysm of the abdominal aorta is not uncommon in later life. The frequency of aneurysm rupture varies with aneurysm diameter. In rare cases, the aneurysm may rupture intra-abdominally into surrounding structures and give rise to a fistula. When blood vessels are involved, the commonest form is aortocaval fistula, the presenting symptoms being those of severe right-ventricular heart failure. Although thoracic aorta dissection may be made manifest in acute intense chest pain, it is asymptomatic in up to 50 per cent of cases. The article consists in a case report of asymptomatic thoracic aorta dissection occurring concomitantly with a ruptured abdominal aneurysm the symptoms of which were severe right ventricular heart failure due to an aortocaval fistula causing increased pressure, and severe bilateral oedema of the legs. If the rare complication of an aortocaval fistula could be detected earlier, it might be possible to prevent progression to refractory cardiac failure. The possibility of a fistula should be borne in mind if haematuria is present in a case of abdominal aneurysm or a pulsatile abdominal mass is present in conjunction with a murmur.

Aortic Dissection↗
PubMed1998

Mediastinal perforation and contralateral hemothorax by a chest tube.

Tube thoracostomy is an invasive and common procedure that is often life-saving, but by no means innocuous. We describe herein a case of chest trauma in which the chest tube crossed through the mediastinum between aorta and esophagus and penetrated the contralateral pleural cavity causing mild hemothorax. A literature search has failed to identify a similar case: the misplacement was detected in a control radiograph which led to early adjustment of the tube and no sequalae.

Aged↗
PubMed1998

A simple technique for anchoring chest tubes.

Although some techniques have been described for securing chest tubes, many complications are still reported. A simple method is described for securing chest tubes and closure of the wound, resulting in good fixation of the tube and an airtight closure of the chest wall with a cosmetically satisfactory result.

Chest Tubes↗
PubMed1996

Neutrophil activation and tissue neutrophil sequestration in a rat model of thermal injury.

Neutrophil (PMN) deposition in tissues (leukosequestration) after shock may produce local tissue injury from proteases and oxygen intermediaries which are released from sequestered PMNs. We quantified leukosequestration in tissues in burned rats using two methods of analysis: 1), measurement of lung myeloperoxidase (MPO); 2), measurement of radiolabeled PMNs and erythrocytes deposited in multiple tissues. After tracheostomy and venous cannulation, rats received 17% TBSA full-thickness contact burns and were resuscitated with 20 cc intraperitoneal saline. Lung PMNs were estimated by measuring MPO in lung tissue. PMN influx into lung, liver, spleen, gut, skin, muscle, kidney, and brain was determined by removing (preburn) and differentially radiolabeling PMNs (111In) and erythrocytes (51Cr), reinfusing cells 4.5 hr postburn, and measuring tissue radioactivity 5 hr postburn. Tissue edema was measured by determining extravasation of 125I-labeled albumin in tissues. Peripheral blood PMNs were analyzed for intracellular H2O2 content utilizing a fluorescent dye which reacts with H2O2 coupled with analysis of cell fluorescence by flow cytometry. MPO was elevated in lungs 8 hr postburn (P < 0.05). PMN influx into lung tissues was confirmed by histologic examination. Radioisotope studies demonstrated significant (P < 0.05) leukosequestration into lung, gut, kidney, skin, and brain tissues at 5 hr postburn. Respiratory burst activity of peripheral blood PMNs was increased 5 hr postburn (P < 0.05). Flow cytometric analysis indicated that peripheral blood PMNs were capable of producing markedly increased H2O2 levels 5 hr postburn. Tissue edema, manifested by radiolabeled albumin influx, was not seen in any tissues. Since others have shown that sequestration of metabolically active PMNs may induce remote tissue injury, therapies which block postburn leukosequestration may be able to improve clinical outcomes by limiting remote tissue injury.

Animals↗
PubMed1996

Cost-effectiveness of colour duplex sonography compared with angiography of the pelvis and lower limb.

The present investigation was performed to assess the clinical consequences, utility and efficacy of colour duplex sonography (CDS) compared with angiography as a preoperative examination in aorta, pelvis and lower limb, and thus to estimate the cost-effectiveness of CDS. CDS was additionally performed in 53 consecutive patients referred for preoperative angiography of the lower limb. The results for 49 patients were reviewed and compared to assess the technique's clinical utility. The costs of the two methods and the consequences of inappropriate treatment were assessed. In 15 patients inadequate diagnoses were obtained at CDS. If surgery had been performed solely on the basis of the ultrasonographic diagnosis, repeat surgery would have been necessary in 9 patients. In a further 3 patients necessary surgery would not have been performed. Two patients would have been overtreated (unnecessary surgery instead of percutaneous transluminal balloon angioplasty). To correct the initial incorrect diagnosis the estimated yearly cost would be approximately 1.3 million Swedish crowns. In addition, complications and discomfort could be anticipated for the patients. Because of its low sensitivity CDS ist not cost-effective as a preoperative investigation of arteries of the pelvis and lower limb.

Adult↗
PubMed1996

Spontaneous nitroblue-tetrazolium (NBT) reduction related to granulocyte priming and activation.

The aim of the present study was to explore the relationship between the increasing level of spontaneous NBT-reduction and the tendency for PMNs to marginate during experimental hemorrhagic shock in rats. Rat PMNs, isolated on Percoll density gradients or suspended in blood, were examined by chemiluminescence (CL), NBT-test and by their CD-18 expression and F-actin formation. The NBT-test generally produced higher numbers of activated PMNs when the cells were suspended in buffer than in whole blood, probably due to the scavenging properties of blood. The level of spontaneous NBT-reduction of PMNs in blood correlated with the magnitude of the NBT-response to f-MLP stimulation in blood and buffer. On the contrary, there were no significant correlations between spontaneous NBT reduction, CD18 expression and F-actin content. Thus, high levels of spontaneous NBT reduction in blood were associated with priming of the separated PMNs rather than increased rigidity (F-actin) or adhesiveness (CD18).

Actins↗
PubMed1996

Effects of E-selectin and P-selectin blockade on neutrophil sequestration in tissues and neutrophil oxidative burst in burned rats.

OBJECTIVE: Neutrophil deposition in tissues (leukosequestration) after shock may produce local tissue injury from proteases and high-energy oxygen species released from sequestered neutrophils. The initial step in the binding of neutrophils to capillary endothelium is the interaction of adhesion molecule (selectin) receptors between neutrophils and endothelial cells. We quantified leukosequestration in the tissues of burned rats using two methods of analysis: a) measurement of lung myeloperoxidase; and b) measurement of radiolabeled neutrophils and erythrocytes deposited in multiple tissues. We then determined the ability of a selectin receptor blocking agent to affect neutrophil deposition in tissues after burn injury. DESIGN: Prospective, controlled, laboratory study. SETTING: University research laboratory. SUBJECTS: Male Wistar rats (200 to 300 g). INTERVENTIONS: After tracheostomy and venous cannulation, rats received 17% total body surface area full-thickness contact burns and were resuscitated with saline (20 mL i.p.). Experimental animals received 2 mg/kg body weight i.v. administration of a P- and E-selectin blocking monoclonal antibody, CY-1747, immediately after burn. Lung tissue neutrophils were estimated by measuring myeloperoxidase in lung tissue. Neutrophil retention in lung, liver, spleen, gut, skin, muscle, kidney, and brain tissues was determined by removing (preburn) and differentially radiolabeling neutrophils (111In) and erythrocytes (51Cr), reinfusing cells 4.5 hrs after burn, and measuring tissue radioactivity 30 mins later. Edema was estimated by measuring extravasated 125 I-labeled albumin in the various tissues. Peripheral blood neutrophils were analyzed for intracellular hydrogen peroxide content, utilizing a fluorescent dye that reacts with hydrogen peroxide, coupled with analysis of cell fluorescence by flow cytometry. MEASUREMENTS AND MAIN RESULTS: Myeloperoxidase concentration was increased in lungs 5 hrs after burn (p < .05), indicating neutrophil deposition. Radioisotope studies demonstrated significant (p < .05) leukosequestration into the lung, gut, kidney, skin, and brain tissues at 5 hrs after burn. Flow cytometry showed increased intracellular hydrogen peroxide content in peripheral blood neutrophils 5 hrs after burn. Tissue edema, manifested by radiolabeled albumin retention, was not seen in any tissues. Postburn neutrophil deposition in lungs and liver was blocked (p < .05) by administration of CY-1747 after burn, but maximal neutrophil hydrogen peroxide content was unaffected. CONCLUSION: Burn injury in rats results in accumulation of neutrophils in multiple tissues. Neutrophil deposition in the lungs and liver is blocked by administration of the E/P-selectin blocking antibody, CY-1747. Since sequestration of metabolically active neutrophils may induce tissue injury, therapies that block postburn leukosequestration may improve clinical outcomes by limiting remote tissue injury.

Animals↗
PubMed1995

Accessible hyaluronan receptors identical to ICAM-1 in mouse mast-cell tumours.

Immunohistochemical studies of the hyaluronan (HA)-receptor (R), originally found on liver endothelial cells (LEC) and related to the intercellular adhesion molecule 1 (ICAM-1), showed that polyclonal antibodies against HARLEC (HA receptor on LEC) also stain structures in mouse mastocytomas, mainly vessels. To test if intravenously administered HA might target the tumour receptors in vivo, mice carrying an inoculated mastocytoma in one hind leg muscle were injected in the tail vein with 125I-tyrosine (T)-labelled HA and killed 75 min after injection when organs and tissues were checked for radioactivity. When doses exceeding the binding capacity of the liver were injected, a significant increase in radioactivity (up to five-fold) within the tumour tissue was found. The weight adjusted difference between control and tumour tissue was greater for smaller tumours, probably due to necrosis in the larger. HA-staining of tumours from animals receiving 125I-T-HA, showed HA in areas that also stained weakly for ICAM-1 using monoclonal antibodies. ICAM-1 staining was dramatically increased after hyaluronidase treatment of the sections, indicating that the HA is bound to these receptors and thereby blocks antibody recognition.

Animals↗
PubMed1995

NBT reactivity correlates to the distribution of PMNs between rat pulmonary and systemic circulation.

The rat systemic and pulmonary vascular transit times of radiolabeled polymorphonuclear granulocytes (experimental population referred to as "Polys") and mononuclear leukocytes (experimental population referred to as "Monos") (111In) in relation to those of erythrocytes (51Cr) were measured under physiological conditions. Results were also expressed as "circulating" pool and "marginated" pool of the two leukocyte fractions, and it was investigated whether the degree of spontaneous granulocyte activation, measured with the nitro blue tetrazolium (NBT) reduction test, was of importance for the retention of Polys in the lungs. The measured mean vascular transit was similar for Monos and Polys and several times slower than that of the erythrocytes in the pulmonary (17.4 times) and the systemic (4.1 times) vascular beds. The percentage of NBT-positive cells was < 10% in most animals, indicating a low level of spontaneous granulocyte activation. Increasing levels of NBT-positive cells correlated with a redistribution of granulocytes from the systemic marginated cell pool to the pulmonary marginated cell pool. Microscopic evaluation of sections from embedded lung tissue biopsies, obtained after intravital staining of the leukocytes, confirmed the isotope data on pulmonary transit.

Animals↗
PubMed1995

Leukocyte margination during hemorrhagic shock correlates to preshock margination and is reduced by fucoidin.

Systemic and pulmonary circulation kinetics for 51Cr-erythrocytes and 111In-leukocytes were measured in rats during experimental hemorrhagic shock and normotension with or without pretreatment with the antirolling agent fucoidin. Leukocyte margination was expressed as transit factors (white blood cell transit time/red blood cell transit time) for polymorphonuclear and mononuclear cells. There was an increased pooling of leukocytes in the pulmonary and systemic vascular beds during shock with a maximum after 60 min when the transit factors had increased 2.90-3.72 times in the pulmonary vascular bed and 2.00-3.52 times in the systemic vascular bed for mononuclear and polymorphonuclear cells, respectively. High preshock pooling levels lead to a more pronounced increase in pooling during shock. Pretreatment with fucoidin significantly reduced the pooling increase in the systemic vascular bed. Granulocyte oxidative activity (nitro blue tetrazolium test) invariably increased during shock and was not affected by fucoidin.

Animals↗