Browsing by Title

Sort by: Order: Results:

Now showing items 799-818 of 1613
  • Harve, Heini (Helsingin yliopisto, 2009)
    Sudden cardiac arrest (CA) is one of the leading causes of death in Europe. It has been estimated that about 40 % of CA victims have ventricular fibrillation (VF) at the time of the first heart rhythm analysis. The treatment for VF is immediate cardiopulmonary resuscitation (CPR) and rapid defibrillation. The automated external defibrillator (AED) and the concept of public access defibrillation (PAD) may be a key to shortening defibrillation delays. Recent studies have shown that PAD programs are associated with high survival rates from VF when devices have been placed in certain risk sites and used by trained laypersons. Today many public places are equipped with AEDs. The purpose of this study was to find new ways of utilizing layperson defibrillation and promote the concept of public access defibrillation (PAD). The study explored the use of AEDs by non-medical first responders in Finland and cabin crew on board a commercial aircraft. A simulated study was performed to explore the role of dispatcher assistance in layperson CPR and defibrillation. A 15-year follow-up study of 59 one-year survivors after successful out-of-hospital resuscitation was performed to evaluate the long-term quality of life of the CA patients. Although there are many AEDs in use by non-medical first responders in Finland, the results of the study showed that there are large variations between individual first response units. This is considered to be caused by the lack of national standards and regulations that would define a full integration of first-responder programmes into the Emergency Medical Services system. The goal of rapid defibrillation in five minutes after the onset of CA is difficult to achieve in Finland due to sparse population and long distances. Local PAD programs may shorten the defibrillation delays. Dispatcher assistance in defibrillation by a layperson not trained to use an AED seems feasible and does not compromise the performance of CPR. In a simulated study, the quality of mouth-to-mouth ventilation performed by laypersons was found to be better after CPR training compared with performance with dispatcher assistance before training. Training was not found to have an influence on the quality of compressions or defibrillation compared with dispatcher assistance of untrained laypersons. The target groups for CPR and defibrillation training need further evaluation. The placements of the AEDs in public areas should be known by the emergency response center and the location should be marked with an international sign. The finding that once a good neurological outcome after CA is achieved, it can be maintained for more than 10 years, encourages further efforts to improve the survival of CA patients.
  • Toivonen, Päivi (Helsingin yliopisto, 2011)
    Uveal melanoma (UM) is the most common primary ocular malignancy in adults. In Finland, approximately 50 new cases are diagnosed yearly. Up to 50% of UM metastasize, mostly to the liver, although other organs are also affected. Despite improvements in the management of the primary tumour, the survival rates of patients with metastatic UM are poor. Until the 1970s, UMs were treated by enucleation i.e. removal of the eye. Currently, UM is usually treated by brachytherapy, which is known to influence tumour cells and blood vessels. UMs enucleated both primarily and secondarily after brachytherapy contain tumour-infiltrating macrophages, and a high number of macrophages in primary UM is associated with a shorter survival and a higher microvascular density (MVD) within the tumour tissue. The latter is independently associated with a shorter time to metastatic death. Macrophages have several diverse roles depending on their response to variable signals from the surrounding microenvironment. They function as scavengers, as producers of angiogenic and growth factors as well as proteases, which modulate extracellular matrix. Thus, tumour invasiveness and the risk for metastasis increase with increasing macrophage density. The aim of this study was to evaluate the effects of regression and progression of UM on macrophage numbers and microcirculation factors. Tumour regression is induced by primary brachytherapy, and tumour progression is evidenced by the development of metastases. Understanding the biological behaviour of UMs in the both states may help us in finding new treatment modalities against this disease. To achieve these aims case-control analyses of irradiated UMs and primarily-enucleated eyes (34 matched pairs) were performed. UMs were stained immunohistochemically to detect macrophages, extravascular matrix (EVM) loops and networks, and MVD. Following brachytherapy, a lower MVD was observed. The average number of macrophages remained unchanged. Considering that irradiated melanomas may still contain proliferating tumour cells, a clinically-relevant consequence of my study would be the reassurance that the risk for metastasis is likely to be reduced, given that the low MVD in untreated UMs indicates a favourable prognosis. The effect of progression on macrophages was studied in a paired analysis of primarily-enucleated UM and their corresponding hepatic metastases (48 pairs). A cross-sectional histopathological analysis of these pairs was carried out by staining both specimens in a similar way to the first study. MVD was greater in hepatic metastases than in corresponding primary tumours, and the survival of the patient tended to be shorter if hepatic metastases had a higher MVD. Hepatic metastases had also more dendritic macrophages than the primary UMs. Thus, the progression to metastasis seems to alter the inflammatory status within the tumour. Furthermore, determining MVD of biopsied hepatic metastases may serve as a supplementary tool in estimating the prognosis of patients with metastatic uveal melanoma. After irradiation, the majority of treated eyes have been clinically observed to have pigmented episcleral deposits. A noncomparative clinical case series of 211 irradiated UM eyes were studied by recording the number and location of pigmented episcleral deposits during follow-up visits after brachytherapy. For the first time, the study described pigmented episcleral deposits, which are found in the most UM eyes after brachytherapy, and proved them to consist of macrophages full with engulfed melanin particles. This knowledge may save patients from unnecessary enucleation, because episcleral pigmented deposits might be mistaken for extrascleral tumour growth. The presence of pigmented macrophage-related episcleral deposits was associated with plaque size and isotope rather than with tumour size, suggesting that, in addition to tumour regression, radiation atrophy of retinal pigment epithelium and choroid contributes to the formation of the deposits. In the paired (the same 34 pairs as in the first study) cross-sectional study of irradiated and non-irradiated UMs, clinically-visible episcleral deposits and migrating macrophages in other extratumoral tissues were studied histopathologically. Resident macrophages were present in extratumoral tissues in eyes with both irradiated and non-irradiated UM. Irradiation increased both the number of CD68+ macrophages in the sclera beneath the tumour and the number of clinically-observed episcleral macrophages aggregates. Brachytherapy seemed to alter the route of migration of macrophages: after irradiation, macrophages migrated preferentially through the sclera while in non-irradiated UMs they seemed to migrate more along the choroid. In order to understand the influence of these routes on tumour progression and regression in the future, labelling and tracking of activated macrophages in vivo is required.
  • Pöyhiä, Tiina (Helsingin yliopisto, 2011)
    Brachial plexus birth injury (BPBI) is caused by stretching, tearing or avulsion of the C5-C8 or Th1 nerve roots during delivery. Foetal-maternal disproportion is the main reason for BPBI. The goal of this study was to find out the incidence of posterior subluxation of the humeral head during first year of life in BPBI and optimal timing of the ultrasonographic screening of the glenohumeral joint. The glenohumeral congruity and posterior subluxation of the humeral head associated to muscle atrophy were assessed and surgical treatment of the shoulder girdle as well as muscle changes in elbow flexion contracture were evaluated. The prospective, population based part of the study included all neonates born in Helsinki area during years 2003-2006. Patients with BPBI sent to the Hospital for Children and Adolescents because of decreased external rotation, internal rotation contracture or deformation of the glenohumeral joint as well as patients with elbow flexion contracture were also included in this prospective study. The incidence of BPBI was calculated to be 3.1/1000 newborns in Helsinki area. About 80% of the patients with BPBI recover totally during the follow-up within the first year of life. Permanent plexus injury at the age of one year was noted in 20% of the patients (0.64/1000 newborns). Muscle imbalance resulted in sonographically detected posterior subluxation in one third of the patients with permanent BPBI. If muscle imbalance and posterior subluxation are left untreated bony deformities will develop. All patients with internal rotation contracture of the glenohumeral joint presented muscle atrophy of the rotator cuff muscles. Especially subscapular and infraspinous muscles were affected. A correlation was found particularly between greatest thickness of subscapular muscle and subluxation of the humeral head, degree of glenoid retroversion, as well as amount of internal rotation contracture. Supinator muscle atrophy was evident among all the studied patients with elbow flexion contracture. Brachial muscle pathology seemed to be an important factor for elbow flexion contracture in BPBI. Residual dysfunction of the upper extremity may require operative treatment such as tendon lengthening, tendon transfers, relocation of the humeral head or osteotomy of the humerus. Relocation of the humeral head improved the glenohumeral congruency among patients under 5 years of age. Functional improvement without remodeling of the glenohumeral joint was achieved by other reconstructive procedures. In conclusion: Shoulder screening by US should be done to all patients with permanent BPBI at the age of 3 and 6 months. Especially atrophy of the subscapular muscle correlates with glenohumeral deformity and posterior subluxation of the humeral head, which has not been reported in previous studies. Permanent muscle changes are the main reason for diminished range of motion of the elbow and forearm. Relocation of the humeral head, when needed, should be performed under the age of 5 years.
  • Lohman, Martina (Helsingin yliopisto, 2001)
  • Soljanlahti, Sami (Helsingin yliopisto, 2008)
    Cardiovascular diseases (CVD) are, in developed countries, the leading cause of mortality. The majority of premature deaths and disability caused by CVD are due to atherosclerosis, a degenerating inflammatory disease affecting arterial walls. Early identification of lesions and initiation of treatment is crucial because the first manifestations quite often are major disabling cardiovascular events. Methods of finding individuals at high risk for these events are under development. Because magnetic resonance imaging (MRI) is an excellent non-invasive tool to study the structure and function of vascular system, we sought to discover whether existing MRI methods are able to show any difference in aortic and intracranial atherosclerotic lesions between patients at high risk for atherosclerosis and healthy controls. Our younger group (age 6-48) comprised 39 symptomless familial hypercholesterolemia (FH) patients and 25 healthy controls. Our older group (age 48-64) comprised 19 FH patients and 18 type 2 diabetes mellitus (DM) patients with coronary heart disease (CHD) and 29 healthy controls. Intracranial and aortic MRI was compared with carotid and femoral ultrasound (US). In neither age-group did MRI reveal any difference in the number of ischemic brain lesions or white matter hyperintensities (WMHIs) - possible signs of intracranial atherosclerosis - between patients and controls. Furthermore, MRI showed no difference in the structure or function of the aorta between FH patients and controls in either group. DM patients had lower compliance of the aorta than did controls, while no difference appeared between DM and FH patients. However, ultrasound showed greater plaque burden and increased thickness of carotid arterial walls in FH and DM patients in both age-groups, suggesting a more advanced atherosclerosis. The mortality of FH patients has decreased substantially after the late 1980´s when statin treatment became available. With statins, the progression of atherosclerotic lesions slows. We think that this, in concert with improvements in treatment of other risk factors, is one reason for the lack of differences between FH patients and controls in MRI measurements of the aorta and brain despite the more advanced disease of the carotid arteries assessed with US. Furthermore, whereas atherosclerotic lesions between different vascular territories correlate, differences might still exist in the extent and location of these lesions among different diseases. Small (<5 mm in diameter) WMHIs are more likely a phenomenon related to aging, but the larger ones may be the ones related to CVD and may be intermediate surrogates of stroke. The image quality in aortic imaging, although constantly improving, is not yet optimal and thus is a source of bias.
  • Kiuru, Martti (Helsingin yliopisto, 2002)
  • Korhonen, Petri (Helsingin yliopisto, 2002)
  • Palikhe, Anil (Helsingin yliopisto, 2008)
    Most of the genes in the MHC region are involveed in adaptive and innate immunity, with essential function in inflammatory reactions and in protection against infections. These genes might serve as a candidate region for infection and inflammation associated diseases. CAD is an inflammatory disease. The present set of studies was performed to assess whether the MHC region harbors genetic markers for CAD, and whether these genetic markers explain the CAD risk factors: e.g., C. pneumoniae, periodontitis, and periodontal pathogens. Study I was performed using two separate patient materials and age- and sex-matched healthy controls, categorizing them into two independent studies: the HTx and ACS studies. Both studies consistently showed the HLA-A3– B35– DR1 (35 ancestral haplotype) haplotype as a susceptible MHC genetic marker for CAD. HLA-DR1 alone was associated not only with CAD, but also with CAD risk factor diseases, e.g., diabetes mellitus, and hyperlipidemia. The ACS study further showed the HLA-B*07 and -DRB1*15 -related haplotype as a protective MHC haplotype for CAD. Study II showed that patients with CAD showed signs of chronic C. pneumoniae infection when compared to age- and sex-matched healthy controls. HLA-B*35 or -related haplotypes associated with the C. pneumoniae infection markers. Among these haplotype carriers, males and smokers associated with elevated C. pneumoniae infection markers. Study III showed that CAD patients with periodontitis had elevated serum markers of P. gingivalis and occurrence of the pathogen in saliva. LTA+496C strongly associated with periodontitis, while HLA-DRB1*01 with periodontitis and with the elevated serum antibodies of P. gingivalis. Study IV showed that the increased level of C3/C4 ratio was a new risk factor and was associated with recurrent cardiovascular end-points. The increased C3 and decreased C4 concentrations in serum explained the increased level of the C3/C4 ratio. Both the higher than cut-off value (4.53) and the highest quartile of the C3/C4 ratio were also associated with worst survival, increased end-points, and C4 null alleles. The presence of C4 null alleles associated with decreased serum C4 concentration, and increased C3/C4 ratio. In conclusion, the present studies show that the CAD susceptibility haplotype (HLA-A3− B35− DR1 -related haplotypes, Study I) partially explains the development of CAD in patients possessing several recognized and novel risk factors: diabetes mellitus, increased LDL, smoking, C4B*Q0, C. pneumnoiae, periodontitis, P. gingivalis, and complement C3/C4 ratio (Study II, III, and IV).
  • Paakkanen, Riitta (Helsingin yliopisto, 2013)
    Atherosclerosis is a chronic, inflammatory, lifestyle-disease that is also influenced by genetic factors. Coronary atherosclerosis manifests as silent, chronic and acute forms. The acute forms, acute coronary syndromes (ACS) are an important cause of death due to coronary atherosclerosis. The major histocompatibility complex (MHC) region is a collection of genes on chromosome 6 that are associated with immune response. The genes in this region are usually inherited as a strongly linked genetic combination, a haplotype. Certain alleles and haplotypes of the MHC region have been linked with different forms of coronary atherosclerosis. The Thesis was set to study the role of selected MHC genes/alleles in ACS. First aim of the Thesis was to develop a novel quantitative polymerase chain reaction (qPCR) method for complement component C4 analyses. A qPCR method with a novel concentration range approach and SYBR® Green dye was developed (I). It was validated by applying it to over 1600 patient samples with available C4 protein data and by analysing 129 samples that were also assessed with other methods for C4 gene analysis. The results indicated that the developed method can be used to reliably assess C4 copy number variation. The second aim was to confirm the role of selected MHC genes and haplotypes in different clinical forms of ACS. Based on previous studies, four MHC markers that had been reported to be associated with coronary atherosclerosis were selected (HLA-DRB1*01, HLA-B*35, deficiency of complement component C4A or C4B). A haplotype with DRB1*01, with neither C4 deficiencies nor B*35 was more frequently detected in patients suffering from ACS than in healthy controls (11 vs. 5%; III). None of the markers alone was associated with a significantly increased risk of ACS (II-IV). However, the power was too low to exclude a weak association of C4 deficiency and ACS (II, IV). If only men were studied, both DRB1*01 alone and the DRB1*01-haplotype were significantly associated with ACS. The third aim was to evaluate the possible inflammatory mechanisms through which the association of MHC genes/haplotypes and ACS could be mediated. The DRB1*01-haplotype was associated with higher hsCRP levels (III). C4 deficiency segregated patients that benefitted from macrolide treatment in secondary prevention of recurrent ACS (II). C4 deficiency was also associated with elevated heat shock protein 60 IgA autoantibody levels, which, in turn, was shown to be associated with ACS and recurrent cardiovascular end points (IV). C4 deficiency was also increased in patients suffering from recurrent infections (I). The genetic polymorphism in MHC may be linked with ACS by affecting the inflammatory responses. These data are observational and thus do not indicate causality. However, these data might help to elucidate the complex interplay of inflammatory reactions in ACS and in directing patient care.
  • Helenius, Katja (Helsingin yliopisto, 2011)
    All protein-encoding genes in eukaryotes are transcribed into messenger RNA (mRNA) by RNA Polymerase II (RNAP II), whose activity therefore needs to be tightly controlled. An important and only partially understood level of regulation is the multiple phosphorylations of RNAP II large subunit C-terminal domain (CTD). Sequential phosphorylations regulate transcription initiation and elongation, and recruit factors involved in co-transcriptional processing of mRNA. Based largely on studies in yeast models and in vitro, the kinase activity responsible for the phosphorylation of the serine-5 (Ser5) residues of RNAP II CTD has been attributed to the Mat1/Cdk7/CycH trimer as part of Transcription Factor IIH. However, due to the lack of good mammalian genetic models, the roles of both RNAP II Ser5 phosphorylation as well as TFIIH kinase in transcription have provided ambiguous results and the in vivo kinase of Ser5 has remained elusive. The primary objective of this study was to elucidate the role of mammalian TFIIH, and specifically the Mat1 subunit in CTD phosphorylation and general RNAP II-mediated transcription. The approach utilized the Cre-LoxP system to conditionally delete murine Mat1 in cardiomyocytes and hepatocytes in vivo and and in cell culture models. The results identify the TFIIH kinase as the major mammalian Ser5 kinase and demonstrate its requirement for general transcription, noted by the use of nascent mRNA labeling. Also a role for Mat1 in regulating general mRNA turnover was identified, providing a possible rationale for earlier negative findings. A secondary objective was to identify potential gene- and tissue-specific roles of Mat1 and the TFIIH kinase through the use of tissue-specific Mat1 deletion. Mat1 was found to be required for the transcriptional function of PGC-1 in cardiomyocytes. Transriptional activation of lipogenic SREBP1 target genes following Mat1 deletion in hepatocytes revealed a repressive role for Mat1apparently mediated via co-repressor DMAP1 and the DNA methyltransferase Dnmt1. Finally, Mat1 and Cdk7 were also identified as a negative regulators of adipocyte differentiation through the inhibitory phosphorylation of Peroxisome proliferator-activated receptor (PPAR) γ. Together, these results demonstrate gene- and tissue-specific roles for the Mat1 subunit of TFIIH and open up new therapeutic possibilities in the treatment of diseases such as type II diabetes, hepatosteatosis and obesity.
  • Seppänen, Johanna (Helsingin yliopisto, 2008)
    A population-based early detection program for breast cancer has been in progress in Finland since 1987. According to regulations during the study period 1987-2001, free of charge mammography screening was offered every second year to women aged 50-59 years. Recently, the screening service was decided to be extended to age group 50-69. However, the scope of the program is still frequently discussed in public and information about potential impacts of mass-screening practice changes on future breast cancer burden is required. The aim of this doctoral thesis is to present methodologies for taking into account the mass-screening invitation information in breast cancer burden predictions, and to present alternative breast cancer incidence and mortality predictions up to 2012 based on scenarios of the future screening policy. The focus of this work is not on assessing the absolute efficacy but the effectiveness of mass-screening, and, by utilizing the data on invitations, on showing the estimated impacts of changes in an existing screening program on the short-term predictions. The breast cancer mortality predictions are calculated using a model that combines incidence, cause-specific and other cause survival on individual level. The screening invitation data are incorporated into modeling of breast cancer incidence and survival by dividing the program into separate components (first and subsequent rounds and years within them, breaks, and post screening period) and defining a variable that gives the component of the screening program. The incidence is modeled using a Poisson regression approach and the breast cancer survival by applying a parametric mixture cure model, where the patient population is allowed to be a combination of cured and uncured patients. The patients risk to die from other causes than breast cancer is allowed to differ from that of a corresponding general population group and to depend on age and follow-up time. As a result, the effects of separate components of the screening program on incidence, proportion of cured and the survival of the uncured are quantified. According to the predictions, the impacts of policy changes, like extending the program from age group 50-59 to 50-69, are clearly visible on incidence while the effects on mortality in age group 40-74 are minor. Extending the screening service would increase the incidence of localized breast cancers but decrease the rates of non-localized breast cancer. There were no major differences between mortality predictions yielded by alternative future scenarios of the screening policy: Any policy change would have at the most a 3.0% reduction on overall breast cancer mortality compared to continuing the current practice in the near future.
  • Alestalo, Paula Kaarina (Helsingin yliopisto, 2015)
    ABSTRACT The general objective of this thesis was to study management and leadership in the Public Dental Service (PDS) in Finland during the major Dental Care Reform in 2003–2011. The specific aims were to study 1) how dentists became leaders in the PDS and 2) what characterised their leadership, 3) distribution of leadership positions between women and men, 4) chief dentists’ position in the municipal hierarchy, as seen from their own superiors’ and subordinates’ points of view and 5) chief dentists’ attitudes to the Dental Care Reform and the changes it caused in the work environment. Four questionnaire surveys based on four data sets were carried out in 2003. The target groups were the chief dentists of the municipal PDS units (health centres) (n=265), the chief physicians (n=233), the line managers (superiors) of the chief dentists, PDS dentists who were subordinates to the chief dentists (n=365), and the chairpersons of Municipal Boards of Social Affairs and Health (MBSH) (n=233). In 2011, the target group was the chief dentists alone (n=161). Factor analysis, linear regression analysis, parametric and non-parametric tests were used in the analysis of the materials. The results showed that only fewer than a fifth (17%) of chief dentists were full-time leaders in 2011 and they worked in the largest health centres. The rest also provided patient care, to varying degrees. In 2003 and 2011, nearly two thirds (62%) of the chief dentists identified themselves as leaders instead of seeing themselves only as dentists among other dentists in the PDS, though fewer than a third (31%) of them had applied for their posts. More precisely, just 21% of female and 43% of male chief dentists (p<0.001) had applied for the chief dentist posts they held. Chief dentists felt they were better people-oriented leaders than goal-oriented managers (p<0.001). Nevertheless, 49% p<0.001) of their job satisfaction was explained by the fact that they were motivated to lead, their position as superiors to their subordinates was good, they had enough (3-4 on a scale 1-4) decision making power, they were good goal-oriented managers (good in sum variables ≥3 on a scale 1-4 from very bad to very good), and had received enough (3 on a scale 1-3) leadership education. In addition, if they had a good position as subordinates to their superiors, chief physicians and MBSH chairpersons (p<0.001), and when they had applied for their posts, they felt contented (p<0.001). In 2003, their subordinates, the PDS dentists, appreciated their people-oriented female superiors highest. Chief dentists themselves as subordinates felt they received little feedback and support from their superiors (chief physicians), and their own subordinates, the PDS dentists, felt the same (p<0.001). Chief dentists’ superiors (chief physicians and MBSH chairpersons) evaluated the chief dentists as good managers and leaders, whereas the chief dentists’ subordinates evaluated their superiors in less positive terms. In 2003, more than half (59%) of the chief dentists were very positive (4 on a scale 1-4) towards the recently introduced reforms of the Health Insurance Act (HIA) promoting adults’ treatment in the private sector by increasing reimbursement for dental care. Fewer than half (43%) were very positive towards the reform of the Primary Health Care Act (PHCA) improving adults’ access to care in the public sector (p<0.001). In 2011, only 20% totally agreed (4 on a scale 1-4) that the implementation of the Dental Care Reform had succeeded. The respondents’ general opinion was that the timetable for the Reform was too tight and not enough resources were allocated. In general, the chief dentists considered their position as isolated and rather weak in the municipal hierarchy. Effective and rewarding leadership in the PDS needs more attention in the future.
  • Lindahl, Jan (Helsingin yliopisto, 2015)
    Jan Lindahl: MANAGEMENT OF PELVIC RING INJURIES Unstable pelvic ring injuries are relatively rare injuries, but they constitute a major cause of death and disability in high-energy polytrauma patients Massive hemorrhage is the leading cause of potentially preventable death following a blunt pelvic trauma. The overall aim of surgical treatment for unstable pelvic ring injuries is to restore the pelvic anatomy and perform neural decompression, thus allowing normal function with a low rate of complications. This doctoral thesis was initiated to investigate the outcomes of acute and definitive management strategies for unstable pelvic ring injuries. The first study investigated the radiological and functional results of treating type B and C pelvic injuries with an anterior external fixation frame. The second study focused on identifying factors for early predictions of mortality-related outcome and prognosis in patients with pelvic fracture-related arterial bleeding that were treated with transcatheter angiographic embolization (TAE). The third study investigated the outcomes of type C pelvic fractures treated with standardized reduction and internal fixation methods. The fourth study evaluated outcomes and identified prognostic factors for operatively-treated, H-shaped sacral fractures with spinopelvic dissociation. Study I showed that an anterior external fixator failed to achieve and properly maintain reduction in 75% of type B open book injuries and in nearly all (95%) type C pelvic ring injuries. Therefore, an external frame is not a suitable method of treatment for the most unstable pelvic ring injuries as a definitive treatment. The current clinical applications of anterior pelvic external fixators comprise the resuscitation phase, initial fracture stabilization phase, and sometimes, in complex injuries (type C), the definitive phase for fixation of the anterior part of the pelvic ring, in conjunction with posterior internal fixation. Study II of pelvic fracture related arterial bleedings showed that the worst prognosis was related to exsanguinating bleeding from the main trunk of the internal or external iliac artery (large pelvic arteries) or from multiple branches of the internal or external iliac vasculature (high vessel size score). Definitive control of arterial bleeding was achieved with TAE in all patients. In massive hemorrhage with several bleeding arteries uni- or bilaterally, it is reasonable to use non-selective embolization by promptly occluding the main trunk of the internal iliac artery, either uni- or bilaterally. Study III of operatively treated type C pelvic fractures revealed that, internal fixation of injuries in the posterior and anterior pelvic ring provided excellent or good radiological results in 90% of cases. Additionally, because a reduction with displacement less than or equal to 5 mm was more often associated with a good functional outcome, that should be the goal of operative management. However, the prognosis is also often dependent on associated injuries, particularly a permanent lumbosacral plexus injury. The results favoured internal fixation of all the injured elements of the pelvis for improved stability and a more accurate anatomical result in the entire pelvic ring. The H-shaped sacral fracture with spinopelvic dissociation is a rare injury pattern. Study IV revealed that lumbopelvic fixation was a reliable treatment method. The study also showed that neurological recovery and clinical outcome were associated with the degree of initial translational displacement of the transverse sacral fracture component. Permanent neurological deficits were more frequent and the clinical outcome was worst in completely displaced transverse sacral fractures. An accurate operative reduction of all sacral fracture components was associated with better neurological recovery and clinical outcome. We conclude, that with appropriate treatment of unstable pelvic ring injuries, and associated injuries in other organs, it is possible to achieve better survival rates and functional results, and to reduce long-term disability.
  • Koskenmies, Sari (Helsingin yliopisto, 2004)