Search results for "determination"

Left ventricular volume determination using colour superpositioning of contrast echocardiograms

1995

Abstract Objective: To delineate the endocardium, selective colouring of contrast regions in left ventricular contrast echocardiograms was performed using digital image processing. Methods: Volume determinations were performed in end-diastolic and end-systolic frames before and after the injection of contrast agent into the left ventricle and were compared to cineventriculograms in 30 patients by two independent investigators. Results: The mean end-diastolic volume measured was 114 ± 44 ml in the native, 235 ± 79 ml in the contrast, 175 ± 70 ml in the color-superimposed (observer 1), and 187 ± 79 ml in the cineventriculographic images. Thus, native echocardiograms underestimated angiographi…

Accuracy of pre-hospital triage tools for major trauma: a systematic review with meta-analysis and net clinical benefit

2021

Abstract Background We conducted a systematic review to evaluate and compare the accuracy of pre-hospital triage tools for major trauma in the context of the development of the Italian National Institute of Health guidelines on major trauma integrated management. Methods PubMed, Embase, and CENTRAL were searched up to November 2019 for studies investigating pre-hospital triage tools. The ROC (receiver operating characteristics) curve and net clinical benefit for all selected triage tools were performed. Quality assessment was performed using the Quality Assessment of Diagnostic Accuracy Studies–2. Certainty of the evidence was judged with the Grading of Recommendations Assessment, Developme…

Calculating confidence intervals for impact numbers

2006

Abstract Background Standard effect measures such as risk difference and attributable risk are frequently used in epidemiological studies and public health research to describe the effect of exposures. Recently, so-called impact numbers have been proposed, which express the population impact of exposures in form of specific person or case numbers. To describe estimation uncertainty, it is necessary to calculate confidence intervals for these new effect measures. In this paper, we present methods to calculate confidence intervals for the new impact numbers in the situation of cohort studies. Methods Beside the exposure impact number (EIN), which is equivalent to the well-known number needed …

Calculation of NNTs in RCTs with time-to-event outcomes: A literature review

2008

Abstract Background The number needed to treat (NNT) is a well-known effect measure for reporting the results of clinical trials. In the case of time-to-event outcomes, the calculation of NNTs is more difficult than in the case of binary data. The frequency of using NNTs to report results of randomised controlled trials (RCT) investigating time-to-event outcomes and the adequacy of the applied calculation methods are unknown. Methods We searched in PubMed for RCTs with parallel group design and individual randomisation, published in four frequently cited journals between 2003 and 2005. We evaluated the type of outcome, the frequency of reporting NNTs with corresponding confidence intervals,…

Stakeholders’ expectations of Healthy Life Centers: A focus group study

2016

Aims: The aims of this study were to explore stakeholders’ expectations of municipal Healthy Life Centers (HLCs) in Norway, and to evaluate whether these expectations were compatible with current guidelines and recommendations. Methods: A multidisciplinary team of researchers arranged focus group sessions with Healthy Life Centre staff, municipality administration, county administration, general practitioners and representatives of three patient organizations. We audiotaped and transcribed the sessions verbatim. In analyses we used Systematic Text Condensation and an editing analysis style. Results: Expectations spanned from primary prevention among children to rehabilitation of adults wit…

Comparing medical treatments for Crohn’s disease

2013

The drugs available for inflammatory bowel disease are aminosalicylates, antibiotics, steroids, immunosuppressors and biologics. The effectiveness of these drugs has been evaluated in many randomized clinical trials, mainly versus placebo. Few studies have been conducted comparing the different drugs among themselves, owing to the methodological problems raised by comparative trials, such as sample size and blindness. This review focuses mainly on the randomized clinical trials that have compared different treatments. Of course comparisons are mainly between drugs used in a particular setting (mild, moderate and severe disease). However, on many occasions there is no homogeneity in these cl…

On the Number of Measurements Necessary to Assess Regional Cerebral Blood Flow by Local Laser Doppler Recordings: A Simulation Study with Data from 4…

1995

Laser Doppler fluxmetry may improve the monitoring of cortical blood flow in neurosurgical patients. So far, however, the variability of laser Doppler readings found in the cerebral cortex has prevented a consequent usage of the technique in clinical practice. The current report analyzes the regional variability of laser Doppler readings from experimental animals. Typical frequency histograms of observed flow values display non-Gaussian distributions. A simulation technique is used to assess the number of measuring sites required for valid estimates of regional cortical flow. From a total of 990 local flow measurements from 45 rabbits random samples of sizes between 5 and 100 were repeatedl…

2021 European Society of Hypertension practice guidelines for office and out-of-office blood pressure measurement.

2021

High blood pressure (BP) is the leading modifiable risk factor for morbidity and mortality worldwide. The basis for diagnosing and managing hypertension is the measurement of BP, which is routinely used to initiate or rule out costly investigations and long-term therapeutic interventions. Inadequate measurement methodology or use of inaccurate BP measuring devices can lead to overdiagnosis and unnecessary treatment, or underdiagnosis and exposure to preventable cardiovascular disease (CVD). [...]

Direct and surrogate measures of the white-coat effect: Methodological aspects and clinical relevance

2000

Efficacy and predictors of outcome of short-term psychodynamic psychotherapy (stpp) in depressed breast cancer patients: A randomised controlled trial

2013

Results: 34 people made up the data set. 25/34 (74%) answered the questionnaire. 11/25(44%) had suicidal thoughts in the previous 72 hours. 3/34 (9%) had deliberately self-harmed in the previous 72 hours. 29/34 (85%) stated that the needle exchange would be their first contact point in health care if they had concerns over theirmental health. Qualitative data revealed drug workers are providing mental health support to service users, but haven’t received formal training. Discussion: This is a small study limited by questionnaire design and sample size. However, it does highlight some important points. Namely, drug users remain at higher risk of suicide ideation and selfharm than general pop…