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A missing data treatment for data mining applications in medical information systems.

To apply user-friendly, easily operated and accessible tools to handle missing data resulting from an auto-stored medical information system, these tools are applied to satisfy general users from different disciplines (i.e. statistics and machine-learning), followed by medical information system development. This study attempts to develop a new logic separation inference method applied to a database with a format like most real-world medical records containing many missing data and miscellaneous variables. It is expected that this method should have better performance than currently accessible methods. The newly developed logic separation inference method shows a classification power of 0.997 (elimination method is 1), which is better than the simple replacing method (replaced by mode shows 0.974). Both inference methods (mode and mean) have superior classification power to the simple replacing method. The missing data treatment processes introduced in this study can be completed on a MS Excel spreadsheet without any complicated calculation; therefore, they can satisfy general users. This new missing data treatment method is only applied up to 60% of the missing data (missing at random). However, when there is large amount of data, it is expected that this method also can be applied to a database missing more than 60%.

Humans↗

Amino acid neurotransmitter release and learning: a study of visual imprinting.

The intermediate and medial part of the hyperstriatum ventrale (IMHV) is an area of the domestic chick forebrain that stores information acquired through the learning process of imprinting. The effects of visual imprinting on the release of the amino acids aspartate, arginine, citrulline, gamma-aminobutyric acid (GABA), glutamate, glycine and taurine from the left and right IMHVs in vitro were measured at 3.5, 10 and 24 h after training. Chicks were exposed to an imprinting stimulus for 1 h, their preferences measured 10 min afterward and a preference score calculated as a measure of the strength of learning. Potassium stimulation was used to evoke amino acid release from the IMHVs of trained and untrained chicks in the presence and absence of extracellular Ca2+. Ca2+-dependent, K+-evoked release of glutamate was significantly (34.4%) higher in trained than in untrained chicks. This effect was not influenced by time after training or by side (left or right IMHV). Training influenced the evoked release of GABA and taurine from the left IMHV at both 3.5 and 10 h. The training effects at the two times were statistically homogeneous so data (< or = 10 h group) were combined for each amino acid respectively. For this < or = 10 h group, evoked release increased significantly with preference score. In contrast, for the 24 h group, evoked release of GABA and taurine was not significantly correlated with preference score. There were no significant correlations between preference score and GABA or taurine release in the right IMHV at any time, nor in the absence of extracellular calcium. No significant effects of training condition, time or side were observed for any other amino acid in the study. The present findings suggest that soon after chicks have been exposed to an imprinting stimulus glutamatergic excitatory transmission in IMHV is enhanced, and remains enhanced for at least 24 h. In contrast, the learning-related elevations in taurine and GABA release are not sustained over this period. The change in GABA release may reflect a transient increase in inhibitory transmission in the left IMHV.

Amino Acids↗

Surreptitious learning: menarche and menstrual product advertisements.

The purpose of this study was to examine the messages conveyed in menstrual product advertisements with specific concern given to information that could be learned about menstruation and the female body by menarcheal girls. Over 200 advertisements from popular women's magazines were analyzed using constant comparative analysis. The core variable was Heightening Insecurities. The themes identified in menstrual product advertisements function to heighten insecurities in the female adolescent reader. The findings revealed that the advertisements were a reflection of the negative societal views of menstruation and, because the advertisements function to heighten insecurities, they also function to perpetuate and maintain the silence and shame which surrounds menstruation in our society.

Adaptation, Psychological↗

Patient safety and health policy: a history and review.

Policy initiatives on many fronts have converged to improve patient safety. A major tension that characterizes this process is the attempt to achieve a balance between learning and control in complex systems with technical, social, and organizational components. Efforts to improve learning are marked by better information flow, discovery, flexibility in thinking, embracing of failures as learning opportunities, and core incentives to promote voluntary participation of all stakeholders in the process. Efforts to improve accountability are traditionally marked by public disclosure, meeting of certain widely disseminated standards, availability of performance measures, exposure to legal liability, and compliance with mandated directives (statutes, regulations, accreditation requirements). In some sense, these directions are mutually exclusive. Although a more collaborative regulatory-improvement model would be helpful in creating an industrywide safety culture, it is likely that learning and accountability functions will follow separate tracks. An exception would be policy that stimulates organizations to comply with regulation by showing how well and by what methods they are learning and how others can profit from these experiences. Any approach to improving patient safety should, at a minimum, include a nonpunitive in-depth mechanism for reporting incidents, postincident evaluations for identification of system changes to prevent subsequent occurrences, and state-guaranteed legislative protection from discovery for all aspects of information gathered to improve patient safety. Nonpunitive approaches have yielded useful results in other industries [43]. State and federal courts, state licensing boards, and accrediting bodies such as JCAHO all function to maintain accountability and standards; however, the very fear of existing legal liability or its misapplication are the greatest hurdles to pioneering patient-safety efforts. The health care system needs to transform the existing culture of blame and punishment that suppresses information about errors and adverse events into a culture of safety that focuses on openness and information sharing to improve health care and prevent adverse outcomes. Education and leadership will be most important to creating and sustaining a strong safety culture and arguably the most important defense against preventable harms. Safety culture cannot be legislated, just as the old adage states that it is easier to pull rather than push a piece of spaghetti. Given the imbalances and inefficiencies of market forces in health care, perverse incentives that have strengthened resistance to change, and secrecy when it comes to adverse event information, however, it is likely that policy initiatives will continue to play an important role in the transformation of the industry to more highly reliable, safer levels of care.

Delivery of Health Care↗

Clinical practice guidelines and organizational adaptation: a framework for analyzing economic effects.

OBJECTIVES: The overall objective of this article was to review the theoretical and conceptual dimensions of how the implementation of clinical practice guidelines (CPGs) is likely to affect treatment costs. METHODS: An important limitation of the extant literature on the cost effects of CPGs is that the main focus has been on clinical adaptation. We submit that the process innovation aspects of CPGs require changes in both clinical and organizational dimensions. We identify five organizational factors that are likely to affect the relationship between CPGs and total treatment costs: implementation, coordination, learning, human resources, and information. We review the literature supporting each of these factors. RESULTS: The net organizational effects of CPGs on costs depends on whether the cost-reducing properties of coordination, learning, and human resource management offset potential cost increases due to implementation and information management. CONCLUSIONS: Studies of the cost effects of clinical practice guidelines should attempt to measure, to the extent possible, the effects of each of these clinical and organizational factors.

Clinical Protocols↗

Specificity of sensorimotor learning and the neural code: neuronal representations in the primary motor cortex.

Human studies show that the learning of a new sensorimotor mapping that requires adaptation to directional errors is local and generalizes poorly to untrained directions. We trained monkeys to learn new visuomotor rotations for only one target in space and recorded neuronal activity in the primary motor cortex before, during and after learning. Similar to humans, the monkeys showed poor transfer of learning to other directions, as observed by behavioral aftereffects for untrained directions. To test for internal representations underlying these changes, we compared two features of neuronal activity before and after learning: changes in firing rates and changes in information content. Specific elevations of firing rate were only observed in a subpopulation of cells in the motor cortex with directional properties corresponding to the locally learned rotation; namely cells only showed plasticity if their preferred direction was near the training one. We applied measures from information theory to probe for learning-related changes in the neuronal code. Single cells conveyed more information about the direction of movement and this specific improvement in encoding was correlated with an increase in the slope of the neurons' tuning curve. Further, the improved information after learning enabled a more accurate reconstruction of movement direction from neuronal populations. Our findings suggest a neural mechanism for the confined generalization of a newly acquired internal model by showing a tight relationship between the locality of learning and the properties of neurons. They also provide direct evidence for improvement in the neural code as a result of learning.

Action Potentials↗

Disruption of hippocampal CA3 network: effects on episodic-like memory processing in C57BL/6J mice.

Lesion studies have demonstrated the prominent role of the hippocampus in spatial and contextual learning. To better understand how contextual information is processed in the CA3 region during learning, we focused on the CA3 autoassociative network hypothesis. We took advantage of a particularity of the mossy fibre (MF) synapses, i.e. their high zinc concentration, to reversibly disrupt the afferent MF pathway by microinfusions of an intracellular (DEDTC) or an extracellular (CaEDTA) zinc chelator into the CA3 area of the dorsal hippocampus of mice. Disruption of the CA3 network significantly impaired the acquisition and the consolidation of contextual fear conditioning, whereas contextual retrieval was unaffected. These results also suggest a heterogeneity between the cognitive processes underlying spatial and contextual memory that might be linked to the specific involvement of free zinc in contextual information processing.

Animals↗

The impact of the national information infrastructure on distance education and the changing role of the nurse.

PURPOSE/OBJECTIVES: To describe a new opportunity for learning--distance education--that is available to oncology nurses and the role of the nurse educator in the distance-learning environment. DATA SOURCES: Literature and electronic information. DATA SYNTHESIS: Distance learning is a new option for oncology nurses that is based on the assumption that the student is motivated to grasp new ideas and will pursue studies with autonomy and honesty. This article reviews the principals of distance learning, its advantages, and the role of the nurse educator in this new learning environment. CONCLUSIONS: Electronic networks are providing oncology nurses with the opportunity to share information and collaborate with colleagues throughout the world. This same technology supports the opportunity for distance education. Oncology nurses have numerous opportunities to participate in distance learning, both as learners and as nurse educators, and the advantages of this new learning environment are numerous. IMPLICATIONS FOR NURSING PRACTICE: Opportunities now exist for formal education (both undergraduate and graduate) and continuing education for oncology nurses via distance learning. Oncology nurses need to treat technology as a friend and use distance learning to cultivate life-long learning.

Computer Communication Networks↗

Informed consent procedures: an experimental test using a virtual character in a dialog systems training application.

Researchers are generally trained to administer informed consent by studying approved guidelines, but still can fail to satisfactorily answer questions from potential participants. An application using a virtual character allowed novice participants to practice administering informed consent. This character was designed to behave as a potential participant for a study and asked many of the questions research participants typically ask, such as queries about the study itself, the sponsor, timing, selection procedures, confidentiality, voluntariness, benefits and risks, and contact information. The user responded to the character's queries as if speaking with a true potential research participant. The application was effective even after only brief usage. In a laboratory experiment, novice participants who practiced with the virtual character were later more effective in conducting informed consent interviews with a human interviewee than those who were trained only with written materials. Thus, simulated learning-by-doing improved informed consent skills. Implications for related health dialog applications are discussed.

Biomedical Research↗

Direct interventions for improving the performance of individuals with Alzheimer's disease.

Direct interventions are being used increasingly to maintain and improve the communicative and cognitive functioning of patients with Alzheimer's dementia. Speech-language pathologists can play an integral role in maximizing the functioning of dementia patients by selecting appropriate direct interventions that capitalize on spared neuropsychological abilities to compensate for impaired abilities. Successful direct interventions use techniques that facilitate learning and retention of information and skills. In this article, direct intervention techniques-repeated exposure via spaced retrieval training and quizzes; errorless learning; multisensory stimulation using music, toys, pets, and memory wallets; and other approaches to cognitive-linguistic stimulation such as the use of personal computers; the Montessori method; and activity programming-are reviewed. The rationale for use of these direct interventions and available efficacy data with Alzheimer's patients also are presented.

Aged↗

Migrating a lecture in nursing informatics to a blended learning format--A bottom-up approach to implement an open-source web-based learning management system.

At the university of applied sciences in Germany a learning management system has been implemented. The migration of classic courses to a web-enhances curriculum can be categorized into three phases independent of the technology used. The first two phases "dedicated website" and "database supported content management system" are mainly concerned with bringing the learning material and current information online and making it available to the students. The goal is here to make the maintenance of the learning material easier. The third phase characterized by the use of a learning management system offers the support of more modern didactic principles like social constructionism or problem-oriented learning. In this papers the phases as they occurred with the migration of a course of nursing informatics are described and experiences discussed.. The absence of institutional goals associated with the use of a learning management system led to a bottom-up approach triggered by faculty activities that can be described by a promoter model rather than by a process management model. The use of an open source learning management systems made this process easier to realize since no financial commitment is required up front.

Education, Distance↗

Self-care competence among persons with spinal cord injury.

The authors of this article report the results of a secondary data analysis which examined the self-care competence of persons with spinal cord injury (SCI) and the retention of cognitive and functional skills following discharge from acute rehabilitation as well as additional learning of self-care following discharge. The sample consisted of 48 persons with SCI from two Veterans Affairs Medical Centers and a state university affiliated rehabilitation program. The data collection tool was the Self-Care Assessment Tool (SCAT) which measures cognitive and functional skills in eight self-care areas: bathing/grooming, nutritional management, taking medications, mobility/transfer/safety, skin management, bladder management, bowel management, and dressing. The overall self-care competence of the participants was high (mean = 78.25) as was their competence in the eight self-care areas. In general, participants retained both the cognitive information and functional skills learned in the acute rehabilitation setting and also continued to learn after discharge in both cognitive information and functional skills.

Activities of Daily Living↗

Using the Internet to teach consumers about quality care.

BACKGROUND: The Internet is an important source of health information for consumers. Patients can learn about their diagnoses, review treatments and medications, and locate other health information for themselves and their families. Information about quality care can also be found on the Internet. Few consumers, though, use these Web sites for learning about quality care. SEARCH FOR WEB SITES ON QUALITY CARE: In 2000 the investigators searched the Internet and generated a list of approximately 90 relevant Internet documents under the broad heading of quality health care. They then pared the list to 34, by using the Health Information Technology Institute (HITI) criteria. TESTING OF INTERNET DOCUMENTS BY CONSUMERS: In the second phase of the project, 5 of the 34 Internet documents were tested by a convenience sample of 32 consumers. Most of the participants had experience in using the Internet, although generally not in the area of quality care. They found the Web sites easy to use and indicated that the Internet resources would help them assess the quality of care they receive from physicians, nurses, and others. DISCUSSION: Web sites need to be evaluated to ensure that the information they provide is accurate and current, among other criteria. All patients should understand their health benefits and the importance of making informed decisions about their health care, as well as how quality care is measured, how to use quality reports, how to choose providers and hospitals, how to assess the quality of their own care and be more involved in it, and what they should do when faced with new diagnoses.

Community Participation↗