Quality assurance of personal beta particle dosemeters used for individual monitoring of occupationally exposed persons

As a result of investigations and intercomparison measurements organised from 1996 to 1999 by PTB, several types of personal dosemeters, all based on TLD, were selected by the dosimetry services for the measurement of the personal dose equivalent Hp(0.07) in beta and/or photon radiation fields. These dosemeters have now the status of legal personal beta partial-body dosemeters. Workplaces at which beta radiation might significantly contribute to the doses to the extremities are to be found today with increasing frequency in radiation therapy, radiation source production and nuclear power plants. Quality assurance for beta personal dosemeters is stipulated by guidelines for the official dosimetry service and is carried out by way of the intercomparison measurements organised periodically by the PTB. The results are evaluated based on the recommendations of the German Commission on Radiological Protection (SSK). The procedure of these intercomparison measurements will be explained in detail. The experience gained from three series of comparisons with seven types of fingerring dosemeters will be described and the results will be presented. The anonymity of the dosemeter types and of the participants in the intercomparison will be preserved.

Measuring errors in surgical pathology in real-life practice: defining what does and does not matter

This review summarizes our experience using blinded review as a method to measure quality in surgical pathology. It details the specifics about how the review is performed, the weaknesses in the method, and then summarizes our results so far. These results suggest that error rates correlate with the individual pathologist, the type of specimen, the type of diagnosis, subspecialization, and the number of pathologists who review a case. Errors do not correlate with workload. This method is relatively unbiased and effective at identifying significant errors in real life clinical practice. The drawback to this method is the amount of work involved. Blinded review, performed so that errors can be corrected in a timely manner, and eventually integrated into an interlaboratory review process, represents a realistic and fair method to provide quantitative quality assurance information.

Family history is neglected in the work-up of patients with colorectal cancer: a quality assessment using cancer registry data

In the diagnostic work-up of hereditary non-polyposis colorectal cancer (HNPCC, Lynch syndrome), high-risk patients can be identified using information from the family history on cancer ('Amsterdam criteria' and 'Bethesda guidelines'). To investigate to what extent the medical specialists apply these criteria to patients with colorectal carcinoma and a suspicion of HNPCC, we collected information on diagnostic work-up of 224 patients of seven hospitals in the region of the Comprehensive Cancer Centre West in Leiden, The Netherlands. These patients were diagnosed with colorectal cancer between 1999 and 2001 and satisfied at least one of the Bethesda guidelines. A complete family history was recorded for 38 of the 244 patients (16%). Patients with a complete family history were more likely to be referred to the Clinical Genetic Centre than those with an incomplete or absent family history (53% vs. 13% and 4%, respectively; P < 0.0001), and more likely to be analyzed for microsatellite instability (MSI), which is a characteristic of HNPCC (34% vs. 6% and 1%, respectively; P < 0.0001). We conclude that the family history is neglected in the majority of patients with colorectal cancer and MSI-analysis is only performed in a small proportion of the patients that meet the guidelines for this analysis.

External quality assessment of hemoglobin A2 measurement: data from an Italian pilot study with fresh whole blood samples and commercial HPLC systems

BACKGROUND

To evaluate the extent of interlaboratory variation and accuracy in hemoglobin A(2) (HbA(2)) assays, a pilot study of external quality assessment was organized among 48 Italian laboratories routinely measuring HbA(2). As part of the study, a survey was also performed by sending a questionnaire concerning some important analytical aspects related to the determination of HbA(2).

METHODS

The trial specimens consisted of three whole blood samples (A, B and C) with normal, pathological and borderline HbA(2) content, respectively. All laboratories used HPLC analyzers from the same manufacturer (Bio-Rad Laboratories).

RESULTS

Normal and pathological samples were clearly differentiated by all laboratories, while data for the borderline sample partially overlapped those for the other samples. The overall interlaboratory coefficient of variation was 8.0%, 6.0% and 7.9% for samples with low, high and intermediate HbA(2) levels, respectively. To assign HbA(2) target values to the samples, the median of the laboratory group was used. The accuracy of HbA(2) results was evaluated on the basis of allowable total error. The proportion of laboratories reporting unacceptable results was 31.9% (15 out of 47) for sample A, 17.0% (8 out of 47) for sample B, and 31.9% (15 out of 47) for sample C. No abnormalities in the chromatographic separation pattern were reported by any of the laboratories.

CONCLUSIONS

We conclude that quality in the measurement of HbA(2) should be improved.

[Overdiagnosis of cranio-cerebral injuries as a diagnisis error]

The report presents the problem of a diagnostic error consisting in abusing the diagnosis of cerebro-cranial injuries, and especially cerebral concussion. Diagnoses of cerebro-cranial injuries, including brain concussion established by physicians, including specialists, are often inappropriate in view of the medical history, clinical manifestations and laboratory findings. There are several reasons for the misdiagnoses (diagnostic abuse), but most commonly they result from an inappropriately taken medical history, excessive trust in the patient, and willingness to help the patient in receiving higher compensation. Overdiagnosing is also caused by the conviction shared by physicians that a diagnostic error lies in non-detection of a disease or injury rather than in overdiagnosing the patient in order to avoid subsequent charges. This is why proceedings at law against physicians who have overdiagnosed injuries occur only sporadically.

Hospital accreditation policy in Lebanon: its potential for quality improvement

Limited evidence exists on whether government owned-and-funded hospital accreditation system brings long-lasting impact in terms of continuous quality improvement to patient care. Literature shows that hospitals might adopt opportunistic behaviors solely with the aim of gaining accreditation particularly when governments link the quality improvement objective of accreditation with payment mechanisms. Literature also suggests that there is true value in creating an independent, not-for-profit national commission dedicated to improve quality of care. In 2002, the Lebanese Ministry of Public Health with the assistance of an Australian consultant team developed and implemented a new hospital accreditation policy. Since its implementation, little information is known on whether this policy has the potential to bring long-lasting quality improvement to patient care. By synthesizing literature, and reviewing other countries' accreditation experiences, this paper will identify barriers and derive observations and lessons for health policy makers and hospital leaders in Lebanon to consider for their ongoing efforts to further improve the hospital accreditation policy and its implementation. Also, it will provide valuable lessons for other countries in the East Mediterranean region which have implemented accreditation process or are in the process of doing so.

The Commission on Cancer, American College of Surgeons' response to HIPAA

The Commission on Cancer is able to continue serving the CoC-Approved Cancer Programs following enactment of a business associate agreement between each of the programs and the ACoS. Worrisome unintended consequences, potentially threatening the value of the products that the CoC provides cancer patients, providers, and families, were not realized because of the Business Associate role that the CoC assumes with each of the CoC-Approved programs.

[Evaluation of clinical laboratories--assurance of their quality and competence]

Since ISO 15189:2003 was published, the accreditation program of clinical laboratories based on ISO 15189 has been introduced in many countries, except for those in USA where all clinical laboratories must be required to follow the federal law, CLIA'88. It will certainly help the accredited clinical laboratories improve their quality and competence. In relation to the activity of JCTLM, reference measurement laboratories will be accredited, based on ISO 15195 which is now under its review and amendment by ISO/TC212/WG2. In Japan, JCCLS (Japanese Committee for Clinical Laboratory Standards) and JAB (Japan Accreditation Board for Conformity Assessment) cojointly started the accreditation program for clinical laboratories, based on ISO 15189:2003, and a total of 15 laboratories including university hospitals, community hospitals and independent clinical laboratories have been accredited up until the end of 2006.

Clinical indicators: development and applications

Clinical indicators give an indication of the quality of the patient care delivered. They must comply with highquality standards and should be constructed in a careful and transparent manner. Indicators must be relevant to the important aspects of quality of care. There should be adequate research evidence that the recommendations from which they are derived are related to clinical effectiveness, safety and efficiency. They should measure the quality in a valid and reliable manner with little inter- and intra-observer variability so that they are suitable for comparisons between professionals, practices, and institutions. Indicators are selected from research data with consideration for optimal patient care (preferably an evidence-based guideline), supplemented by expert opinion. In the selection procedure, the feasibility, such as their measurability and improvability, is important beside validity and reliability. A clinical indicator should be defined exactly and expressed as a quotient. After a try-out, the measurements and reporting should follow. The report contains an in-depth analysis of causal and contributing factors associated with the measured results. A description of the clinical circumstances and a correction for case mix should be included to allow for a justified interpretation. The indicators must be part of an improvement strategy, for which comparison feedback is often used. We give examples of indicator development and applications in oncology, diabetes care, and the use of antibiotics for treating pneumonia. We explain how comparison with reference data can be used to construct improvement programmes.

Neurologists for patient safety: Where we stand, time to deliver

Neurologists have a professional opportunity, an ethical responsibility, and sound clinical and economic reasons for engaging in efforts to improve patient safety. Better communication with patients and other providers, closer follow-up of consultation cases, and more focused supervision of trainees will help to reduce current patterns of error and misunderstanding. Patient education with attention to health literacy should improve adherence to management plans and help to bridge transitions of care across providers and sites. Through teaching and by example, neurologists can profoundly influence successive generations of clinicians to adopt safer practices, a culture of openness, and enhanced professionalism. The federal Safety and Quality Improvement Act of 2005, once implemented, should increase the evidence basis for safer care through voluntary, legally protected reporting of errors and adverse events within the framework of patient safety organizations.

Development of dosimetry using detectors of diagnostic digital radiography systems

Dosimetry using an imaging plate (IP) of computed radiography (CR) systems was developed for quality control of output of the x-ray equipment. Sensitivity index, or the S number, of the CR systems was used for estimating exposure dose under the routine condition: exposure dose from 1.0 to 1.0 x 10(2) microC kg(-1), tube voltages from 50 to 120 kV, and added filtration from 0 to 4.0 mm Al. The IP was calibrated by using a 6 cc ionization chamber having traceability to the National Standard Ionization Chamber. The uncertainty concerning the fading effect was suppressed less than 1.9% by reading the latent image 4 min+/-5 s after irradiation at the room temperature 25.9+/-1.0 degrees C. The S number decreased linearly on the logarithmic graph regardless of the beam quality as exposure dose increased. The relationship between the exposure dose (E) and the S number was fitted by the equation E=a' X S(-b). The coefficient a' decreased when the added filtration and the tube voltage were increased. The coefficient b was 0.977+/-0.007 in all beam qualities. The dosimetry using the IP and the equation can estimate the exposure dose in a range from 9.0 x 10(-2) to 5.0 microC kg(-1) within an uncertainty of +/-5% required by the Japanese Industry Standard. This dose range partially included the doses under routine condition. The doses between 1.0 and 1.0 x 10(2) microC kg(-1) under the routine condition can be shifted to the 5% region by using an absorber. The IP dosimetry is applicable to the quality control of the CR systems.

The role of post-implant dosimetry in the quality assessment of prostate implants. The RAH experience

The quality of a prostate implant using radioactive I-125 seeds can be assessed by performing post-implant dosimetry, which therefore has to be a reliable evaluation tool. At the RAH, we have noticed large variations in post-implant dosimetric parameters compared to the pre-implant data. The purpose of this study was to investigate the cause of these differences. Post-implant dosimetry was performed 4 weeks after implant on 15 prostate cancer patients. The CT images of the pelvis were exported to the planning system, where contouring of the target (prostate) was executed by 6 clinicians, followed by the post-implant dosimetry performed by a physicist. Pre- and post-implant dosimetric parameters were analyzed and compared. The average target volume based on the ultrasound measurements was 35.8 cc. Post-implant CT volumes were determined and averaged over the 15 patients by each clinician, and their average values vary from 28.9 cc to 67.9 cc. Beside the under/overestimation of the target on the CT there was also a "shift" in the target base on the ultrasound image. By comparing pre-implant and post-implant dosimetric parameters we have encountered a significant discrepancy between target volumes based on ultrasound image and CT image. It was concluded that the accuracy of target coverage was partially connected to the poorer quality of the CT image compared to the ultrasound scan, patient's anatomy, but mostly to the poor implantation of the base.

The 8 dimensions of quality

Healthcare providers can better develop strategies for achieving and maintaining high-quality care by reviewing quality of care laws and metrics in relation to eight dimensions of quality: Reporting. Documentation. Quantity or access to care. Patient satisfaction. Provider reputation. Clinical processes. Utilization review. Medical necessity determinations.

Interobserver and intraobserver variation in day 3 embryo grading

OBJECTIVE

Variations in pregnancy rates (PR) between IVF programs are due to multiple factors, including embryo quality. Standardized embryo grading systems have been developed to improve communication between embryologists and clinicians. However, these grading systems have not been validated. We sought to quantify both interobserver and intraobserver variability using a standardized day 3 embryo grading system (Veeck scale).

DESIGN

Prospective, sample-randomized, controlled, blinded study.

SETTING

University hospital.

PATIENT(S)

Twenty-six practicing embryologists.

INTERVENTION(S)

Observation and grading of 35 video clips of day 3 embryos.

MAIN OUTCOME MEASURE(S)

Interobserver and intraobserver variability. Embryologists were also assessed by education level, years of experience, size of IVF program, and type of grading system used. Kappa scores and intraclass correlation coefficients were calculated.

RESULT(S)

Practicing embryologists differed from control (Lucinda Veeck) by as much as two grades, despite using the same grading system (Kappa = 0.24, interclass correlation coefficient = 0.98). There was also variability in grading the same embryo (Kappa = 0.69, interclass correlation coefficient = 0.88). Programs with higher cycle numbers per year had lower variability.

CONCLUSION(S)

There is substantial interobserver variability and moderate intraobserver variability among embryologists. Such variability could alter both the expected quality of embryos transferred, as well as the number transferred, both of which directly impact IVF program success.