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- OrthGomer, K, et al.
(författare)
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Lipoprotein(a) as a determinant of coronary heart disease in young women
- 1997
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Ingår i: Circulation. - NATL INST PSYCHOSOC FACTORS & HLTH,HUDDINGE,SWEDEN. DEACONESS HOSP,INST PREVENT CARDIOVASC DIS,BOSTON,MA. HARVARD UNIV,SCH PUBL HLTH,DEPT EPIDEMIOL,BOSTON,MA 02115. KAROLINSKA HOSP,DEPT CARDIOL,S-10401 STOCKHOLM,SWEDEN. KAROLINSKA HOSP,DEPT THORAC RADIOL,S-10401 STOCKHOLM,SWEDEN. UNIV TEXAS,DIV CARDIOL,HOUSTON,TX. : AMER HEART ASSOC. - 0009-7322 .- 1524-4539. ; 95:2, s. 329-334
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Tidskriftsartikel (refereegranskat)abstract
- Background Lipoprotein(a) [Lp(a)] appears to be a risk factor for coronary heart disease (CHD) in men. The role of Lp(a) in women, however, is less clear. Methods and Results We examined the ability of Lp(a) to predict CHD in a population-based case-control study of women 65 years of age or younger who lived in the greater Stockholm area. Subjects were all patients hospitalized for an acute CHD event between February 1991 and February 1994. Control subjects were randomly selected from the city census and were matched to patients by age and catchment area. Lp(a) was measured 3 months after hospitalization by use of an immunoturbidometric method (Incstar) calibrated to the Northwest Lipid Research Laboratories (coefficient of variation was <9%). Of the 292 consecutive patients, 110 (37%) were hospitalized for an acute myocardial infarction, and 182 were hospitalized (63%) for angina pectoris. The mean age for both patients and control subjects was 56+/-7 years. Of participants, 74 patients (25%) and 84 control subjects (29%) were premenopausal. The distributions of Lp(a) were highly skewed in both patients and control subjects, with a range from 0.001 to 1.14 g/L. Age-adjusted odds ratio for CHD in the highest versus the lowest quartile of Lp(a) was 2.3 (95% confidence interval [CI], 1.4 to 3.7). After adjustment for age, smoking, education, body mass index, systolic blood pressure, total cholesterol, triglycerides, and HDL, the odds ratio was 2.9 (95% CI, 1.6 to 5.0). The odds ratios were similar when myocardial infarction and angina patients were compared with their respective control subjects. The odds ratios were 5.1 (95% CI, 1.4 to 18.4) and 2.4 (95% CI, 1.3 to 4.5) in premenopausal and postmenopausal women, respectively. Conclusions These results suggest that Lp(a) is a determinant of CHD in both premenopausal and postmenopausal women.
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| 3. |
- Fridner, Ann, et al.
(författare)
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Why don't academic physicians seek needed professional help for psychological distress?
- 2012
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Ingår i: Swiss Medical Weekly. - : SMW Supporting Association. - 1424-7860 .- 1424-3997. ; 142:JULY
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: Suicidal thoughts, burnout and other signs of psychological distress are prevalent among physicians. There are no studies concerning help-seeking for psychological distress among university hospital physicians, who face a particularly challenging, competitive work environment. We compare psychologically-distressed university hospital physicians who have not sought needed help with those who have sought such help. We thereby aim to identify factors that may hinder help-seeking and factors that may trigger seeking help. METHODS: Analysis was performed among university hospital physicians reporting recent suicidal thoughts and/or showing other indications of current psychological illhealth. These distressed physicians were a subgroup (42.7%) from the cross-sectional phase I HOUPE study (Health and Organization among University Hospital Physicians in Europe): 366 from Sweden and 150 from Italy. Having sought professional help for depression or burnout was the outcome variable. Multiple logistic regression was performed with socio-demographic factors as covariates. RESULTS: Altogether 404 (78.3%) of these distressed physicians had never sought professional help for depression/burnout. Physicians who were currently involved in medical research, taking night call, surgical specialists, male, or Italian were least likely to have sought help. Physicians who faced harassment at work or who self-diagnosed and self-treated were more likely to have sought help. CONCLUSION: Very few of these university hospital physicians with signs of psychological distress sought help from a mental-health professional. This has implications for physicians themselves and for patient care, clinical research, and education of future physicians. More study, preferably of interventional design, is warranted concerning help-seeking among these physicians in need.
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| 4. |
- Andisheh, B., et al.
(författare)
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A Comparative Analysis of Radiobiological Models for Cell Surviving Fractions at High Doses
- 2013
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Ingår i: Technology in Cancer Research & Treatment. - : SAGE Publications. - 1533-0346 .- 1533-0338. ; 12:2, s. 183-192
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Tidskriftsartikel (refereegranskat)abstract
- For many years the linear-quadratic (LQ) model has been widely used to describe the effects of total dose and dose per fraction at low-to-intermediate doses in conventional fractionated radiotherapy. Recent advances in stereotactic radiosurgery (SRS) and stereotactic radiotherapy (SRT) have increased the interest in finding a reliable cell survival model, which will be accurate at high doses, as well. Different models have been proposed for improving descriptions of high dose survival responses, such as the Universal Survival Curve (USC), the Kavanagh-Newman (KN) and several generalizations of the LQ model, e.g. the Linear-Quadratic-Linear (LQL) model and the Pade Linear Quadratic (PLQ) model. The purpose of the present study is to compare a number of models in order to find the best option(s) which could successfully be used as a fractionation correction method in SRT. In this work, six independent experimental data sets were used: CHOAA8 (Chinese hamster fibroblast), H460 (non-small cell lung cancer, NSLC), NCI-H841 (small cell lung cancer, SCLC), CP3 and DU145 (human prostate carcinoma cell lines) and U1690 (SCLC). By detailed comparisons with these measurements, the performance of nine different radiobiological models was examined for the entire dose range, including high doses beyond the shoulder of the survival curves. Using the computed and measured cell surviving fractions, comparison of the goodness-of-fit for all the models was performed by means of the reduced e-test with a 95% confidence interval. The obtained results indicate that models with dose-independent final slopes and extrapolation numbers generally represent better choices for SRT. This is especially important at high doses where the final slope and extrapolation numbers are presently found to play a major role. The PLQ, USC and LQL models have the least number of shortcomings at all doses. The extrapolation numbers and final slopes of these models do not depend on dose. Their asymptotes for the cell surviving fractions are exponentials at low as well as high doses, and this is in agreement with the behaviour of the corresponding experimental data. This is an important improvement over the LQ model which predicts a Gaussian at high doses. Overall and for the highlighted reasons, it was concluded that the PLQ, USC and LQL models are theoretically well-founded. They could prove useful compared to the other proposed radiobiological models in clinical applications for obtaining uniformly accurate cell surviving fractions encountered in stereotactic high-dose radiotherapy as well as at medium and low doses.
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| 5. |
- Andisheh, Bahram, et al.
(författare)
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Improving the therapeutic ratio in stereotactic radiosurgery : optimizing treatment protocols based on kinetics of repair of sublethal radiation damage
- 2013
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Ingår i: Technology in Cancer Research & Treatment. - : SAGE Publications. - 1533-0346 .- 1533-0338. ; 12:4, s. 349-361
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Tidskriftsartikel (refereegranskat)abstract
- Sublethal damage after radiation exposure may become lethal or be repaired according to repair kinetics. This is a well-established concept in conventional radiotherapy. It also plays an important role in single-dose stereotactic radiotherapy treatments, often called stereotactic radiosurgery, when duration of treatment is extended due to source decay or treatment planning protocol. The purpose of this study is to look into the radiobiological characteristics of normal brain tissue and treatment protocols and find a way to optimize the time course of these protocols. The general problem is nonlinear and can be solved numerically. For numerical optimization of the time course of radiation protocol, a biexponential repair model with slow and fast components was considered. With the clinically imposed constraints of a fixed total dose and total treatment time, three parameters for each fraction (dose-rate, fraction duration, time of each fraction) were simultaneously optimized. A biological optimization can be performed by maximizing the therapeutic difference between tumor control probability and normal tissue complication probability. Specifically, for gamma knife radiosurgery, this approach can be implemented for normal brain tissue or tumor voxels separately in a treatment plan. Differences in repair kinetics of normal tissue and tumors can be used to find clinically optimized protocols. Thus, in addition to considering the physical dose in tumor and normal tissue, we also account for repair of sublethal damage in both these tissues.
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