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The British Journal of Surgery Aug 1998For most solid tumours, surgery remains the most effective primary treatment. Despite apparently curative resection, significant numbers of patients develop secondary... (Review)
Review
BACKGROUND
For most solid tumours, surgery remains the most effective primary treatment. Despite apparently curative resection, significant numbers of patients develop secondary disease due to growth of undetected micrometastases. The ability of a tumour to metastasize is related to the degree of angiogenesis it induces. In addition, micrometastases rely on new vessel formation to provide the nutrients necessary for growth. A better understanding of how tumours acquire their blood supply may lead to more effective adjuvant therapies and improve survival following surgery.
METHODS
A systematic review of the literature on angiogenesis between 1971 and 1997 was performed using the Medline database to ascertain current thinking on angiogenesis and its relevance in oncological surgery.
RESULTS
Angiogenesis is a physiological process subject to autocrine and paracrine regulation which has the potential to become abnormal and play a part in a number of pathological states, including cancer. Increased angiogenic stimuli in the perioperative period, associated with concomitant reduction in tumour-derived antiangiogenic factors following resection of a primary tumour, result in a permissive environment which allows micrometastases to grow.
CONCLUSION
Recognition of the role of angiogenesis in metastatic tumour growth represents a significant development in our understanding of tumour biology. The development of antiangiogenic agents offers new promise in the treatment of malignancy. Such agents may prevent or control the development and growth of primary and metastatic tumours.
Topics: Growth Substances; Humans; Neoplasms; Neovascularization, Pathologic
PubMed: 9717994
DOI: 10.1046/j.1365-2168.1998.00816.x -
Archives of Sexual Behavior Aug 2022Mobile dating applications (MDAs) have become commonly used tools to seek out dating and sexual partners online. The current review aimed to systematically synthesize...
Mobile dating applications (MDAs) have become commonly used tools to seek out dating and sexual partners online. The current review aimed to systematically synthesize empirical findings in 72 quantitative studies on mobile dating, published in ISI-ranked journals between 2014 and 2020. This review focused on summarizing different approaches toward mobile dating, identity features of quantitative research on mobile dating, and hypothesized antecedents and outcomes of mobile dating. Our findings showed, first, that the literature diverges in how mobile dating is operationalized. Second, quantitative research on mobile dating predominantly consists of cross-sectional studies that draw on theoretical insights from multiple disciplines. Third, a variety of traits and sociodemographics were associated with MDA use. In particular, using MDAs for (1) relational goals related to being male, non-heterosexual, higher levels of sociosexuality, sensation seeking, extraversion, and holding more positive peer norms about using MDAs for relational goals; (2) intrapersonal goals related to being female and having more socially impairing traits; and (3) entertainment goals related to having higher levels of sociosexuality, sensation seeking, and antisocial traits. Outcomes significantly associated with general use of MDAs were scoring higher on sexual permissiveness and on engaging in casual (unprotected) sexual intercourse, as well as having higher risk at nonconsensual sex. MDA use was also connected with increased psychological distress and body dissatisfaction. Shortcomings of the existing research approaches and measures are discussed and six methodological and theoretical recommendations for future research are provided.
Topics: Cross-Sectional Studies; Female; Humans; Male; Mobile Applications; Sexual Behavior; Sexual Partners
PubMed: 35790613
DOI: 10.1007/s10508-022-02312-9 -
Intensive Care Medicine Apr 2011The management of trauma patients suffering from active bleeding has improved with a better understanding of trauma-induced coagulopathy. The aim of this manuscript is... (Review)
Review
PURPOSE
The management of trauma patients suffering from active bleeding has improved with a better understanding of trauma-induced coagulopathy. The aim of this manuscript is to give recommendations for coagulation management.
METHODS
A systematic literature search in the PubMed database was performed for articles published between January 2000 and August 2009. A total of 230 articles were included in the present systematic review.
CONCLUSIONS
The "coagulopathy of trauma" is a discrete disease which has a decisive influence on survival. Diagnosis and therapy of deranged coagulation should start immediately after admission to the emergency department. A specific protocol for massive transfusion should be introduced and continued. Loss of body temperature should be prevented and treated. Acidaemia should be prevented and treated by appropriate shock therapy. If massive transfusion is performed using fresh frozen plasma (FFP), a ratio of FFP to pRBC (packed red blood cells) of 1:2-1:1 should be achieved. Fibrinogen should be substituted at levels of <1.5 g/L. For patients suffering from active bleeding, permissive hypotension (i.e. mean arterial pressure ~65 mmHg) may be aimed for until surgical cessation of bleeding. This option is contraindicated in injuries of the central nervous system and in patients with coronary heart disease, or with known hypertension. Thrombelastography or -metry may be performed to guide coagulation diagnosis and substitution. Hypocalcaemia <0.9 mmol/L should be avoided and may be treated. For actively bleeding patients, pRBC may be given at haemoglobin <10 g/L (6.2 mmol/L) and haematocrit may be targeted at 30%.
Topics: Blood Coagulation; Blood Coagulation Disorders; Blood Component Transfusion; Humans; Multiple Trauma; Plasma; Thrombelastography
PubMed: 21318436
DOI: 10.1007/s00134-011-2139-y -
Journal of Health Services Research &... Apr 2015End-of-life policy reforms are being debated in many countries. Research evidence is used to support different assumptions about the effects of public policies on... (Comparative Study)
Comparative Study Review
OBJECTIVES
End-of-life policy reforms are being debated in many countries. Research evidence is used to support different assumptions about the effects of public policies on end-of-life practices. It is however unclear whether reliable international practice comparisons can be conducted between different policy contexts. Our aim was to assess the feasibility of comparing similar end-of-life practices in different policy contexts.
METHODS
This is a scoping review of empirical studies on medical end-of-life practices. We developed a descriptive classification of end-of-life practices that distinguishes practices according to their legal status. We focused on the intentional use of lethal drugs by physicians because of international variations in the legal status of this practice. Bibliographic database searches were supplemented by expert consultation and hand searching of reference lists. The sensitivity of the search strategy was tested using a set of 77 articles meeting our inclusion criteria. Two researchers extracted end-of-life practice definitions, study methods and available comparisons across policy contexts. Canadian decision-makers were involved to increase the policy relevance of the review.
RESULTS
In sum, 329 empirical studies on the intentional use of lethal drugs by doctors were identified, including studies from 19 countries. The bibliographic search captured 98.7% of studies initially identified as meeting the inclusion criteria. Studies on the intentional use of lethal drugs were conducted in jurisdictions with permissive (62%) and restrictive policies (43%). The most common study objectives related to the frequency of end-of-life practices, determinants of practices, and doctors' adherence to regulatory standards. Large variations in definitions and research methods were noted across studies. The use of a descriptive classification was useful to translate end-of-life practice definitions across countries. A few studies compared end-of-life practice in countries with different policies, using consistent research methods. We identified no comprehensive review of end-of-life practices across different policy contexts.
CONCLUSIONS
It is feasible to compare end-of-life practices in different policy contexts. A systematic review of international evidence is needed to inform public deliberations on end-of-life policies and practice.
Topics: Attitude of Health Personnel; Attitude to Health; Europe; Euthanasia, Active; Health Policy; Humans; Suicide, Assisted; United States
PubMed: 25592141
DOI: 10.1177/1355819614567743 -
The Cochrane Database of Systematic... May 2014Permissive hypoxaemia describes a concept in which a lower level of arterial oxygenation (PaO2) than usual is accepted to avoid the detrimental effects of high... (Review)
Review
BACKGROUND
Permissive hypoxaemia describes a concept in which a lower level of arterial oxygenation (PaO2) than usual is accepted to avoid the detrimental effects of high fractional inspired oxygen and invasive mechanical ventilation. Currently however, no specific threshold is known that defines permissive hypoxaemia, and its use in adults remains formally untested. The importance of this systematic review is thus to determine whether any substantial evidence is available to support the notion that permissive hypoxaemia may improve clinical outcomes in mechanically ventilated critically ill patients.
OBJECTIVES
We assessed whether permissive hypoxaemia (accepting a lower PaO2 than is current practice) in mechanically ventilated critically ill patients affects patient morbidity and mortality. We planned to conduct subgroup and sensitivity analyses and to examine the role of bias to determine the level of evidence provided.
SEARCH METHODS
We searched the Cochrane Central Register of Controlled Trials (CENTRAL) 2013, Issue 11, part of The Cochrane Library; MEDLINE (1954 to November 2013); EMBASE (1980 to November 2013); CINAHL (1982 to November 2013) and ISI Web of Science (1946 to November 2013). We combined the sensitive search strategies described in the Cochrane Handbook for Systematic Reviews of Interventions to search for randomized controlled trials (RCTs) in MEDLINE and EMBASE. For ongoing trials, we also searched the following databases: MetaRegister of ControlledTrials and the National Research Register. We applied no language restrictions.
SELECTION CRITERIA
RCTs and quasi-RCTs that compared outcomes for mechanically ventilated critically ill participants, in which the intervention group was targeted to be hypoxaemic relative to the control group, and the control group was normoxaemic or was mildly hypoxaemic, were eligible for inclusion in this review. Exact values defining 'conventional' and 'permissive hypoxaemia' groupings were purposely not specified, and the manner in which these oxygenation goals were achieved also was not specified. We did state however that the intervention group required a target oxygenation level lower than that of the control group, and that the control group target levels should be in the range of normoxaemia or mild hypoxaemia (not hyperoxaemia).
DATA COLLECTION AND ANALYSIS
We used standard methodological procedures expected by The Cochrane Collaboration. Using the results of the above searches, two review authors (EG-K and KM) independently screened all titles and abstracts for eligibility and duplication. No discrepancies were encountered, nor was it necessary for review authors to contact the first author of any trial to ask for additional information.
MAIN RESULTS
Our search strategy yielded a total of 2419 results. After exclusion of duplications, 1651 candidate studies were identified. Screening of titles and abstracts revealed that no studies met our inclusion criteria.
AUTHORS' CONCLUSIONS
This comprehensive review failed to identify any relevant studies evaluating permissive hypoxaemia versus normoxaemia in mechanically ventilated critically ill participants. Therefore we are unable to support or refute the hypothesis that this treatment strategy is of benefit to patients.Given the substantial amount of provocative evidence derived from related clinical contexts (resuscitation, myocardial infarction, stroke), we believe that this review highlights an important unanswered question within critical care. In the presence of two competing harms (hypoxia and hyperoxia), it will be important to carefully evaluate the safety and feasibility of permissive hypoxaemia before proceeding to efficacy and effectiveness trials.
Topics: Adult; Critical Illness; Humans; Hypoxia; Oxygen; Reference Values; Respiration, Artificial
PubMed: 24801519
DOI: 10.1002/14651858.CD009931.pub2 -
Foods (Basel, Switzerland) Sep 2022Home confinement during the COVID-19 pandemic has been accompanied by dramatic changes in household food dynamics that can significantly influence health. This... (Review)
Review
Home confinement during the COVID-19 pandemic has been accompanied by dramatic changes in household food dynamics that can significantly influence health. This systematic literature review presents parental perspectives of the impact of COVID-19 lockdown (up to 30 June 2022) on food preparation and meal routines, as well as other food-related behaviors, capturing both favorable and unfavorable changes in the household food environment. Themes and trends are identified and associations with other lifestyle factors are assessed. Overall, families enjoyed more time together around food, including planning meals, cooking, and eating together. Eating more diverse foods and balanced home-cooked meals (e.g., fresh fruit and vegetables) was combined with overeating and increased snacking (e.g., high-calorie snacks, desserts, and sweets), as parents became more permissive towards food; however, food insecurity increased among families with the lowest income. Adoption of meal planning skills and online shopping behavior emerged alongside behaviors aimed at self-sufficiency, such as bulk purchasing and stockpiling of non-perishable processed foods. These results are an important first step in recognizing how this pandemic may be affecting the family food environment, including low-income families. Future obesity prevention and treatment initiatives, but also ongoing efforts to address food management, parental feeding practices, and food insecurity, can account for these changes moving forward.
PubMed: 36140979
DOI: 10.3390/foods11182851 -
PloS One 2013Laboratory testing is the single highest-volume medical activity and drives clinical decision-making across medicine. However, the overall landscape of inappropriate... (Meta-Analysis)
Meta-Analysis Review
BACKGROUND
Laboratory testing is the single highest-volume medical activity and drives clinical decision-making across medicine. However, the overall landscape of inappropriate testing, which is thought to be dominated by repeat testing, is unclear. Systematic differences in initial vs. repeat testing, measurement criteria, and other factors would suggest new priorities for improving laboratory testing.
METHODS
A multi-database systematic review was performed on published studies from 1997-2012 using strict inclusion and exclusion criteria. Over- vs. underutilization, initial vs. repeat testing, low- vs. high-volume testing, subjective vs. objective appropriateness criteria, and restrictive vs. permissive appropriateness criteria, among other factors, were assessed.
RESULTS
Overall mean rates of over- and underutilization were 20.6% (95% CI 16.2-24.9%) and 44.8% (95% CI 33.8-55.8%). Overutilization during initial testing (43.9%; 95% CI 35.4-52.5%) was six times higher than during repeat testing (7.4%; 95% CI 2.5-12.3%; P for stratum difference <0.001). Overutilization of low-volume tests (32.2%; 95% CI 25.0-39.4%) was three times that of high-volume tests (10.2%; 95% CI 2.6-17.7%; P<0.001). Overutilization measured according to restrictive criteria (44.2%; 95% CI 36.8-51.6%) was three times higher than for permissive criteria (12.0%; 95% CI 8.0-16.0%; P<0.001). Overutilization measured using subjective criteria (29.0%; 95% CI 21.9-36.1%) was nearly twice as high as for objective criteria (16.1%; 95% CI 11.0-21.2%; P = 0.004). Together, these factors explained over half (54%) of the overall variability in overutilization. There were no statistically significant differences between studies from the United States vs. elsewhere (P = 0.38) or among chemistry, hematology, microbiology, and molecular tests (P = 0.05-0.65) and no robust statistically significant trends over time.
CONCLUSIONS
The landscape of overutilization varies systematically by clinical setting (initial vs. repeat), test volume, and measurement criteria. Underutilization is also widespread, but understudied. Expanding the current focus on reducing repeat testing to include ordering the right test during initial evaluation may lead to fewer errors and better care.
Topics: Clinical Laboratory Techniques; Diagnostic Errors; Humans
PubMed: 24260139
DOI: 10.1371/journal.pone.0078962 -
World Neurosurgery Jul 2018Sacral schwannomas are very rare and typically have a benign nature. They occur in a permissive anatomical location leading to nonspecific symptoms that can result in... (Review)
Review
BACKGROUND
Sacral schwannomas are very rare and typically have a benign nature. They occur in a permissive anatomical location leading to nonspecific symptoms that can result in them going unnoticed before reaching a considerable size.
CASE DESCRIPTION
We report a rare case of a giant sacral schwannoma (130 × 110 × 90 mm) in a 38-year-old man originating from the S2 nerve root, encompassing the neural canal with sacral erosion and extension in to the pelvis. The patient presented with a history of abdominal pain associated with increased urinary frequency and a sensation of incomplete bladder emptying. Magnetic resonance imaging demonstrated a giant pelvic mass with sacral erosion and involvement of the nerve roots. Subsequently, he went on to have a 2-stage procedure in which complete resection of the schwannoma was achieved by both a posterior hemilaminectomy and laparotomy with the aid of neuromonitoring. The postoperative course was uneventful, with complete resolution of symptoms.
CONCLUSIONS
We report one of the largest benign sacral schwannoma originating inside the spinal canal with pelvic extension to be resected without complications. We discuss our successful management and conduct a systematic review of the literature to provide the most up to date guidance on managing this tumor, including the application of neuromonitoring and a 360 approach in 2 stages.
Topics: Adult; Humans; Magnetic Resonance Imaging; Male; Neurilemmoma; Pelvis; Sacrum; Spinal Neoplasms; Tomography, X-Ray Computed
PubMed: 29627632
DOI: 10.1016/j.wneu.2018.03.203 -
Open Access Emergency Medicine : OAEM 2012Trauma is a major cause of death and disability. The current trend in trauma management is the rapid administration of fluid as per the Advanced Trauma Life Support... (Review)
Review
BACKGROUND
Trauma is a major cause of death and disability. The current trend in trauma management is the rapid administration of fluid as per the Advanced Trauma Life Support guidelines, although there is no evidence to support this and even some to suggest it might be harmful. Some guidelines, protocols, and recommendations have been established for the use of permissive hypotension although there is reluctance concerning its application in blunt injuries.
OBJECTIVES
The aim of this review is to determine whether there is evidence of the use of permissive hypotension in the management of hemorrhagic shock in blunt trauma patients. This review also aims to search for any reason for the reluctance to apply permissive hypotension in blunt injuries.
METHODS
This systematic review has followed the steps recommended in the Cochrane Handbook for Systematic Reviews of Interventions. It is also being reported in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Statement and checklist. Database searches of MEDLINE, EMBASE, the Centre for Reviews and Dissemination databases and the Cochrane Library were made for eligible studies as well as journal searches. Inclusion criteria included systematic reviews that have similar primary questions to this review and randomized controlled trials where patients with blunt torso injuries and hemorrhagic shock were not excluded. Rapid or early fluid administration was compared with controlled or delayed fluid resuscitation and a significant outcome was obtained.
RESULTS
No systematic reviews attempting to answer similar questions were found. Two randomized controlled trials with mixed types of injuries in the included patients found no significant difference between the groups used in each study. Data concerning the question of this review was sought after these papers were appraised.
CONCLUSION
The limited available data are not conclusive. However, the supportive theoretical concept and laboratory evidence do not show any reason for treating blunt injuries differently from other traumatic injuries. Moreover, permissive hypotension is being used for some nontraumatic causes of hemorrhagic shock and in theater. Therefore, this should encourage interested researchers to continue clinical work in this important field.
PubMed: 27147860
DOI: 10.2147/OAEM.S30666 -
Radiotherapy and Oncology : Journal of... Feb 2011Faecal incontinence (FI) after radiotherapy is a known phenomenon, but has received little attention to date. This article aimed to review current knowledge on faecal... (Review)
Review
BACKGROUND
Faecal incontinence (FI) after radiotherapy is a known phenomenon, but has received little attention to date. This article aimed to review current knowledge on faecal incontinence related to radiotherapy for prostate cancer.
METHODS
PubMed was searched for English-language articles published from January 1966 to December 2009 using the primary keywords 'faecal incontinence', 'prostate cancer' and 'radiotherapy'. Prospective, retrospective and controlled trials reporting FI as a complication of radiotherapy for prostate cancer were included. The retrieved titles and abstracts were screened permissively and evaluated as to whether they satisfied the predefined inclusion and exclusion criteria.
RESULTS
Nine hundred and ninety four articles were identified from the search. After step-wise review, 213 papers were selected for full article review of which 40 were selected for this review. The incidence of faecal incontinence following radiotherapy for prostate cancer varied from 1.6% to 58%. The mechanism of faecal incontinence was not entirely clear but it is most likely due to injury to the nerve plexus of the rectal muscular layer. Correlation between rectal dose-volume parameters and incidence is equivocal, although some studies suggest parameters confined to the lower rectum and/or anal canal may be of value to predict the extent of the injury and could be used as constraints in the dose planning process.
CONCLUSIONS
Interpretation of data is limited due to lack of large cohort studies with data on pre-treatment continence status and because variable instruments have been used to assess the severity of the condition. Well-designed prospective studies are needed to investigate dosimetric parameters focusing on the anal canal and sphincter apparatus. Considering the spatial distribution of radiation to the rectum may identify a more direct linkage between radiation damage and faecal incontinence.
Topics: Anal Canal; Dose-Response Relationship, Radiation; Fecal Incontinence; Humans; Male; Prostatic Neoplasms; Quality of Life; Radiotherapy; Rectum
PubMed: 21257215
DOI: 10.1016/j.radonc.2010.12.004