A review of human factors principles for the design and implementation of medication safety alerts in clinical information systems.

The objective of this review is to describe the implementation of human factors principles for the design of alerts in clinical information systems. First, we conduct a review of alarm systems to identify human factors principles that are employed in the design and implementation of alerts. Second, we review the medical informatics literature to provide examples of the implementation of human factors principles in current clinical information systems using alerts to provide medication decision support. Last, we suggest actionable recommendations for delivering effective clinical decision support using alerts. A review of studies from the medical informatics literature suggests that many basic human factors principles are not followed, possibly contributing to the lack of acceptance of alerts in clinical information systems. We evaluate the limitations of current alerting philosophies and provide recommendations for improving acceptance of alerts by incorporating human factors principles in their design

"The word as image": survey with special reference to the twentieth century

This essay is intended, firstly for those who at some time have had the urge to include words into their otherwise conventional representational images, but are deterred by the suspicion that such elements have no place in the picture plane. Secondly, it is hoped, that this dissertation will provide some understanding concerning the motivations and aims of artists, using "verbal symbols" in their visual images. At this point, I offer some explanation of the term "verbal symbols". The alphabet that we are accustomed to today differs vastly from the first writing that was invented. The naming of items nowadays is arbitrarily established and all we are left with is a name that bears no visual resemblance to the object it represents in real life. The word "house", for example, tells us nothing of the physical nature of a house. However, owing to our conditioning, the word evokes in us a mental picture of a house, even if the details of this picture will vary amongst individuals. Words then are symbols which denote, broadly speaking, objects that exist in our daily lives, without being in any way visual representations of these objects. Of course there are also words which are dependent on other words for their meaning, such as prepositions, conjunctions or suffices, but this is irrelevant to this essay.Thesis (MFA) -- Faculty of Humanities, Fine Art, 199

Getting Better Hospital Alarm Sounds Into a Global Standard

The reserved set of audible alarm signals embodied within the global medical device safety standard, IEC 60601-1-8, is known to be problematic and in need of updating. The current alarm signals are not only suboptimal, but there is also little evidence beyond learnability (which is known to be poor) that demonstrates their performance in realistic and representative clinical environments. In this article, we describe the process of first designing and then testing potential replacement audible alarm signals for IEC 60601-1-8, starting with the design of several sets of candidate sounds and initial tests on learnability and localizability, followed by testing in simulated clinical environments. We demonstrate that in all tests, the alarm signals selected for further development significantly outperform the current alarm signals. We describe the process of collecting considerably more data on the performance of the new sounds than exists for the current sounds, which ultimately will be of use to end users. We also reflect on the process and practice of working with the relevant committees and other practical issues beyond the science, which also need constant attention if the alarms we have developed are to be included successfully in an updated version of the standard

A mixed-methods study exploring the characteristics and needs of long-stay patients in high and medium secure settings in England: implications for service organisation

Background: Forensic psychiatric services provide care for those with mental disorders and offending behaviour. Concerns have been expressed that patients may stay for too long in too high levels of security. The economic burden of these services is high, and they are highly restrictive for patients. There is no agreed standard for ‘long stay’; we defined a length of stay exceeding 5 years in medium secure care, 10 years in high secure care or 15 years in a combination of both settings as long stay. Objectives: To (1) estimate the number of long-stay patients in secure settings; (2) describe patients’ characteristics, needs and care pathways and the reasons for their prolonged stay; (3) identify patients’ perceptions of their treatment and quality of life; and (4) explore stakeholders’ views on long stay. Design: A mixed-methods approach, including a cross-sectional survey (on 1 April 2013) of all patients in participating units to identify long-stay patients [work package (WP) 1], file reviews and consultant questionnaires for long-stay patients (WP2), interviews with patients (WP3) and focus groups with other stakeholders (WP4). Setting: All three high secure hospitals and 23 medium secure units (16 NHS and 9 independent providers) in England. Participants: Information was gathered on all patients in participating units (WP1), from which 401 long-stay patients were identified (WP2), 40 patients (WP3), 17 international and 31 UK experts were interviewed and three focus groups were held (WP4). Results: Approximately 23.5% of high secure patients and 18% of medium secure patients were long-stay patients. We estimated that there are currently about 730 forensic long-stay patients in England. The source of a patient’s admission and the current section of the Mental Health Act [Great Britain. Mental Health Act 1983 (as Amended by the Mental Health Act 2007). London: The Stationery Office; 2007] under which they were admitted predicted long-stay status. Long-stay patients had complex pathways, moving ‘around’ between settings rather than moving forward. They were most likely to be detained under a hospital order with restrictions (section 37/41) and to have disturbed backgrounds with previous psychiatric admissions, self-harm and significant offending histories. The most common diagnosis was schizophrenia, but 47% had been diagnosed with personality disorder. Only 50% had current formal psychological therapies. The rates of violent incidents within institutions and seclusion were high, and a large proportion had unsuccessful referrals to less secure settings. Most patients had some contact with their families. We identified five classes of patients within the long-stay sample with different characteristics. Patients differed in their attribution of reasons for long stay (internal/external), outlook (positive/negative), approach (active/passive) and readiness for change. Other countries have successfully developed specific long-stay services; however, UK experts were reluctant to accept the reality of long stay and that the medical model of ‘cure’ does not work with this group. Limitations: We did not conduct file reviews on non-long-stay patients; therefore, we cannot say which factors differentiate between long-stay patients and non-long-stay patients. Conclusions: The number of long-stay patients in England is high, resulting in high resource use. Significant barriers were identified in developing designated long-stay services. Without a national strategy, these issues are likely to remain. Future work: To compare long-stay patients and non-long-stay patients. To evaluate new service models specifically designed for long-stay patients. Study registration: The National Institute for Health Research (NIHR) Clinical Research Network Portfolio 129376. Funding: The NIHR Health Services and Delivery Research programm

Characteristics and pathways of long-stay patients in high and medium secure settings in England; a secondary publication from a large mixed-methods study

Background: Many patients experience extended stays within forensic care, but the characteristics of long-stay patients are poorly understood. Aims: To describe the characteristics of long-stay patients in high and medium secure settings in England. Method: Detailed file reviews provided clinical, offending and risk data for a large representative sample of 401 forensic patients from 2 of the 3 high secure settings and from 23 of the 57 medium secure settings in England on 1 April 2013. The threshold for long-stay status was defined as 5 years in medium secure care or 10 years in high secure care, or 15 years in a combination of high and medium secure settings. Results: 22% of patients in high security and 18% in medium security met the definition for “long-stay,” with 20% staying longer than 20 years. Of the long-stay sample, 58% were violent offenders (22% both sexual and violent), 27% had been convicted for violent or sexual offences whilst in an institutional setting, and 26% had committed a serious assault on staff in the last 5 years. The most prevalent diagnosis was schizophrenia (60%) followed by personality disorder (47%, predominantly antisocial and borderline types); 16% were categorised as having an intellectual disability. Overall, 7% of the long-stay sample had never been convicted of any offence, and 16.5% had no index offence prompting admission. Although some significant differences were found between the high and medium secure samples, there were more similarities than contrasts between these two levels of security. The treatment pathways of these long-stay patients involved multiple moves between settings. An unsuccessful referral to a setting of lower security was recorded over the last 5 years for 33% of the sample. Conclusions: Long-stay patients accounted for one fifth of the forensic inpatient population in England in this representative sample. A significant proportion of this group remain unsettled. High levels of personality pathology and the risk of assaults on staff and others within the care setting are likely to impact on treatment and management. Further research into the treatment pathways of longer stay patients is warranted to understand the complex trajectories of this group

Designing informative warning signals: Effects of indicator type, modality, and task demand on recognition speed and accuracy

An experiment investigated the assumption that natural indicators which exploit existing learned associations between a signal and an event make more effective warnings than previously unlearned symbolic indicators. Signal modality (visual, auditory) and task demand (low, high) were also manipulated. Warning effectiveness was indexed by accuracy and reaction time (RT) recorded during training and dual task test phases. Thirty-six participants were trained to recognize 4 natural and 4 symbolic indicators, either visual or auditory, paired with critical incidents from an aviation context. As hypothesized, accuracy was greater and RT was faster in response to natural indicators during the training phase. This pattern of responding was upheld in test phase conditions with respect to accuracy but observed in RT only in test phase conditions involving high demand and the auditory modality. Using the experiment as a specific example, we argue for the importance of considering the cognitive contribution of the user (viz., prior learned associations) in the warning design process. Drawing on semiotics and cognitive psychology, we highlight the indexical nature of so-called auditory icons or natural indicators and argue that the cogniser is an indispensable element in the tripartite nature of signification

Searching for meaning in sound: Learning and interpreting alarm signals in visual environments

Given the ease with which the diverse array of environmental sounds can be understood, the difficulties encountered in using auditory alarm signals on medical devices are surprising. In two experiments, with non-clinical participants, alarm sets which relied on similarities to environmental sounds (concrete alarms, such as a heartbeat sound to indicate ‘check cardiovascular function’) were compared to alarms using abstract tones to represent functions on medical devices. The extent to which alarms were acoustically diverse was also examined: alarm sets were either acoustically different or acoustically similar within each set. In Experiment 1 concrete alarm sets, which were also acoustically different, were learned more quickly than abstract alarms which were acoustically similar. Importantly, the abstract similar alarms were devised using guidelines from the current global medical device standard (IEC 60601-1-8, 2012). Experiment 2 replicated these findings. In addition, eye tracking data showed that participants were most likely to fixate first on the correct medical devices in an operating theatre scene when presented with concrete acoustically different alarms using real world sounds. A new set of alarms which are related to environmental sounds and differ acoustically have therefore been proposed as a replacement for the current medical device standard

Patterns of analgesic use, pain and self-efficacy: a cross-sectional study of patients attending a hospital rheumatology clinic

Background: Many people attending rheumatology clinics use analgesics and non-steroidal anti-inflammatories for persistent musculoskeletal pain. Guidelines for pain management recommend regular and pre-emptive use of analgesics to reduce the impact of pain. Clinical experience indicates that analgesics are often not used in this way. Studies exploring use of analgesics in arthritis have historically measured adherence to such medication. Here we examine patterns of analgesic use and their relationships to pain, self-efficacy and demographic factors. Methods: Consecutive patients were approached in a hospital rheumatology out-patient clinic. Pattern of analgesic use was assessed by response to statements such as 'I always take my tablets every day.' Pain and self-efficacy (SE) were measured using the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) and Arthritis Self-Efficacy Scale (ASES). Influence of factors on pain level and regularity of analgesic use were investigated using linear regression. Differences in pain between those agreeing and disagreeing with statements regarding analgesic use were assessed using t-tests. Results: 218 patients (85% of attendees) completed the study. Six (2.8%) patients reported no current pain, 26 (12.3%) slight, 100 (47.4%) moderate, 62 (29.4%) severe and 17 (8.1%) extreme pain. In multiple linear regression self efficacy and regularity of analgesic use were significant (p < 0.01) with lower self efficacy and more regular use of analgesics associated with more pain. Low SE was associated with greater pain: 40 (41.7%) people with low SE reported severe pain versus 22 (18.3%) people with high SE, p < 0.001. Patients in greater pain were significantly more likely to take analgesics regularly; 13 (77%) of those in extreme pain reported always taking their analgesics every day, versus 9 (35%) in slight pain. Many patients, including 46% of those in severe pain, adjusted analgesic use to current pain level. In simple linear regression, pain was the only variable significantly associated with regularity of analgesic use: higher levels of pain corresponded to more regular analgesic use (p = 0.003). Conclusion: Our study confirms that there is a strong inverse relationship between self-efficacy and pain severity. Analgesics are often used irregularly by people with arthritis, including some reporting severe pain

What determines auditory similarity? The effect of stimulus group and methodology.

Two experiments on the internal representation of auditory stimuli compared the pairwise and grouping methodologies as means of deriving similarity judgements. A total of 45 undergraduate students participated in each experiment, judging the similarity of short auditory stimuli, using one of the methodologies. The experiments support and extend Bonebright's (1996) findings, using a further 60 stimuli. Results from both methodologies highlight the importance of category information and acoustic features, such as root mean square (RMS) power and pitch, in similarity judgements. Results showed that the grouping task is a viable alternative to the pairwise task with N > 20 sounds whilst highlighting subtle differences, such as cluster tightness, between the different task results. The grouping task is more likely to yield category information as underlying similarity judgements