Using days alive and out of hospital to measure surgical outcomes in New Zealand: a cross-sectional study.

OBJECTIVES: To measure differences at various deciles in days alive and out of hospital to 90 days (DAOH90) and explore its utility for identifying outliers of performance among district health boards (DHBs). METHODS: Days in hospital and mortality within 90 days of surgery were extracted by linking data from the New Zealand National Minimum Data Set and the births and deaths registry between 1 January 2011 and 31 December 2021 for all adults in New Zealand undergoing acute laparotomy (AL-a relatively high-risk group), elective total hip replacement (THR-a medium risk group) or lower segment caesarean section (LSCS-a low-risk group). DAOH90 was calculated without censoring to zero in cases of mortality. For each DHB, direct risk standardisation was used to adjust for potential confounders and presented in deciles according to baseline patient risk. The Mann-Whitney U test assessed overall DAOH90 differences between DHBs, and comparisons are presented between selected deciles of DAOH90 for each operation. RESULTS: We obtained national data for 35 175, 52 032 and 117 695 patients undergoing AL, THR and LSCS procedures, respectively. We have demonstrated that calculating DAOH without censoring zero allows for differences between procedures and DHBs to be identified. Risk-adjusted national mean DAOH90 Scores were 64.0 days, 79.0 days and 82.0 days at the 0.1 decile and 75.0 days, 82.0 days and 84.0 days at the 0.2 decile for AL, THR and LSCS, respectively, matching to their expected risk profiles. Differences between procedures and DHBs were most marked at lower deciles of the DAOH90 distribution, and outlier DHBs were detectable. Corresponding 90-day mortality rates were 5.45%, 0.78% and 0.01%. CONCLUSION: In New Zealand after direct risk adjustment, differences in DAOH90 between three types of surgical procedure reflected their respective risk levels and associated mortality rates. Outlier DHBs were identified for each procedure. Thus, our approach to analysing DAOH90 appears to have considerable face validity and potential utility for contributing to the measurement of perioperative outcomes in an audit or quality improvement setting.

Perioperative hypothermia in open and laparoscopic colorectal surgery.

BACKGROUND: The consequences of even mild inadvertent perioperative hypothermia (IPH) are significant. There is a perception laparoscopic abdominal surgery is less prone to cause hypothermia than open surgery. However, during laparoscopic surgery, the peritoneal cavity is insufflated with carbon dioxide, which has a greater evaporative capacity than ambient air. This study compared the intra-operative temperature profile of patients undergoing open and laparoscopic colorectal surgery to define the incidence and severity of hypothermia. METHODS: All adult patients undergoing colorectal surgery between May 2005 and August 2013 were identified from an electronic database. Cases were categorized into laparoscopic and open cases. Hypothermic episodes were defined as a temperature less than 36°C lasting for more than two consecutive minutes. The incidence of hypothermic episodes, the total time under 36°C and the area under the curve (degree-minutes) were calculated. RESULTS: A total of 1547 cases were analysed. The overall incidence of hypothermia was 67.0%. The incidence of cases with a hypothermic episode was greater in the laparoscopic group compared to the open group (71.23% versus 63.16%; chi-squared P-value 0.001). However, when other factors were considered, there was no significant difference in the relative risk of a hypothermic episode between types of surgery. There were significant differences in the severity of hypothermia. CONCLUSION: Despite current measures to reduce the incidence, IPH remains a significant problem in colorectal surgery irrespective of the surgical approach. Further research is required to better characterize techniques that can reduce its incidence.

General Anaesthesia Shifts the Murine Circadian Clock in a Time-Dependant Fashion.

Following general anaesthesia (GA), patients frequently experience sleep disruption and fatigue, which has been hypothesized to result at least in part by GA affecting the circadian clock. Here, we provide the first comprehensive time-dependent analysis of the effects of the commonly administered inhalational anaesthetic, isoflurane, on the murine circadian clock, by analysing its effects on (a) behavioural locomotor rhythms and (b) PER2::LUC expression in the suprachiasmatic nuclei (SCN) of the mouse brain. Behavioural phase shifts elicited by exposure of mice (n = 80) to six hours of GA (2% isoflurane) were determined by recording wheel-running rhythms in constant conditions (DD). Phase shifts in PER2::LUC expression were determined by recording bioluminescence in organotypic SCN slices (n = 38) prior to and following GA exposure (2% isoflurane). Full phase response curves for the effects of GA on behaviour and PER2::LUC rhythms were constructed, which show that the effects of GA are highly time-dependent. Shifts in SCN PER2 expression were much larger than those of behaviour (c. 0.7 h behaviour vs. 7.5 h PER2::LUC). We discuss the implications of this work for understanding how GA affects the clock, and how it may inform the development of chronotherapeutic strategies to reduce GA-induced phase-shifting in patients.

Incidence of post-induction hypoxemia in children and the effect of induction gas composition.

BACKGROUND: Pediatric preoxygenation and inhalation induction of anesthesia can include a mixture of gases. In children, the clinical impact on oxygenation while using other gases with oxygen during an inhalation induction is unknown. AIM: We aimed to determine the impact of oxygen, nitrous oxide, and air concentrations added to the volatile agent by recording the incidence of hypoxemia following an inhalation gaseous induction in children. METHOD: Records from an Automated Information Management System were used to find the incidence of hypoxemia following an inhalation induction of anesthesia. Episodes of hypoxemia (SaO2  < 90% sustained for at least 120 s) were recorded in the 10 min after the 3-min induction period. Nitrous oxide and oxygen concentrations were recorded and nitrogen concentration was deduced. We also considered patient sex, age, and ASA status as covariates. RESULTS: A total of 27 258 cases were included in the analysis. The overall incidence of hypoxemia following an inhalation induction of anesthesia was 5.08% (95% CI 4.83 5.35). Hypoxemia was more common in younger patients and those with higher ASA scores. Controlling for those factors and sex, the incidence of hypoxemia increased 1.2-fold when inspired oxygen concentration was less than 60% and hypoxemia was 2.37 times greater than the overall incidence when the inspired oxygen concentration was less than 40%. There was no clear effect of different concentrations of nitrous oxide or nitrogen when those were factored into the model. CONCLUSION: The risk of hypoxemia following an inhalation induction of anesthesia in children is minimized when the inspired concentration of oxygen is greater than 60%.

Evaluation of the effect of multidisciplinary simulation-based team training on patients, staff and organisations: protocol for a stepped-wedge cluster-mixed methods study of a national, insurer-funded initiative for surgical teams in New Zealand public hospitals.

INTRODUCTION: NetworkZ is a national, insurer-funded multidisciplinary simulation-based team-training programme for all New Zealand surgical teams. NetworkZ is delivered in situ, using full-body commercial simulators integrated with bespoke surgical models. Rolled out nationally over 4 years, the programme builds local capacity through instructor training and provision of simulation resources. We aim to improve surgical patient outcomes by improving teamwork through regular simulation-based multidisciplinary training in all New Zealand hospitals. METHODS AND ANALYSIS: Our primary hypothesis is that surgical patient outcomes will improve following NetworkZ. Our secondary hypotheses are that teamwork processes will improve, and treatment injury claims will decline. In addition, we will explore factors that influence implementation and sustainability of NetworkZ and identify organisational changes following its introduction. The study uses a stepped-wedge cluster design. The intervention will roll out at yearly intervals to four cohorts of five District Health Boards. Allocation to cohort was purposive for year 1, and subsequently randomised. The primary outcome measure is Days Alive and Out of Hospital at 90 days using patient data from an existing national administrative database. Secondary outcomes measures will include analysis of postoperative complications and treatment injury claims, surveys of teamwork and safety culture, in-theatre observations and stakeholder interviews. ETHICS AND DISSEMINATION: We believe this is the first surgical team training intervention to be implemented on a national scale, and a unique opportunity to evaluate a nation-wide team-training intervention for healthcare teams. By using a pre-existing large administrative data set, we have the potential to demonstrate a difference to surgical patient outcomes. This will be of interest to those working in the field of healthcare teamwork, quality improvement and patient safety. New Zealand Health and Disability Ethic Committee approval (#16/NTB/143). TRIAL REGISTRATION NUMBER: Australian and New Zealand Clinical Trials Registry ID ACTRN12617000017325 and the Universal Trial Number is U1111-1189-3992.

The effect of implementing an aseptic practice bundle for anaesthetists to reduce postoperative infections, the Anaesthetists Be Cleaner (ABC) study: protocol for a stepped wedge, cluster randomised, multi-site trial.

BACKGROUND: Postoperative infection is a serious problem in New Zealand and internationally with considerable human and financial costs. Also, in New Zealand, certain factors that contribute to postoperative infection are more common in Maori and Pacific populations. To date, most efforts to reduce postoperative infection have focussed on surgical aspects of care and on antibiotic prophylaxis, but recent research shows that anaesthesia providers may also have an impact on infection transmission. These providers sometimes exhibit imperfect hand hygiene and frequently transfer the blood or saliva of their patients to their work environment. In addition, intravenous medications may become contaminated whilst being drawn up and administered to patients. Working with relevant practitioners and other experts, we have developed an evidence-informed bundle to improve key aseptic practices by anaesthetists with the aim of reducing postoperative infection. The key elements of the bundle are the filtering of compatible drugs, context-relevant hand hygiene practices and enhanced maintenance of clean work surfaces. METHODS: We will seek support for implementation of the bundle from senior anaesthesia and hospital leadership and departmental "champions". Anaesthetic teams and recovery room staff will be educated about the bundle and its potential benefits through presentations, written material and illustrative videos. We will implement the bundle in operating rooms where hip or knee arthroplasty or cardiac surgery procedures are undertaken in a five-site, stepped wedge, cluster randomised, quality improvement design. We will compare outcomes between approximately 5000 cases before and 5000 cases after implementation of our bundle. Outcome data will be collected from existing national and hospital databases. Our primary outcome will be days alive and out of hospital to 90 days, which is expected to reflect all serious postoperative infections. Our secondary outcome will be the rate of surgical site infection. Aseptic practice will be observed in sampled cases in each cluster before and after implementation of the bundle. DISCUSSION: If effective, our bundle may offer a practical clinical intervention to reduce postoperative infection and its associated substantial human and financial costs. TRIAL REGISTRATION: Australian New Zealand Clinical Trials Registry, ACTRN12618000407291 . Registered on 21 March 2018.

Paediatric cardiopulmonary resuscitation: Knowledge and perceptions of surf lifeguards.

AIM: To conduct a comprehensive analysis of surf lifeguards' real and perceived ability in paediatric cardiopulmonary resuscitation (CPR), knowledge of child resuscitation protocols and technical competency during a simulated CPR scenario. METHODS: Surf lifeguards aged 16 years and over were invited to complete a written survey and simulated test of five cycles of single-rescuer CPR on a paediatric manikin. In accordance with the latest Australia and New Zealand Committee on Resuscitation (ANZCOR) guidelines, practical skills were assessed by trained observers. A manikin fitted with electronic data-collection capability recorded technical compression and ventilation skills. RESULTS: A total of 244 participants were entered into the study. Most previous CPR training did not include a paediatric component (53%). Lifeguards rated their ability to perform CPR on an adult as 'highly effective' or 'effective' in 56% of responses. Less than a quarter (23%), however, gave this response when compared to a child. Observed CPR skills were mostly compliant with ANZCOR guidelines (80-99%). Manikin data provided a median compression rate of 115.6 min-1 , compression depth of 3.7 cm and tidal volume of 220.0 mL. Almost half of ventilations were too little (45%), and around one fifth were too much (22%). CONCLUSIONS: Surf lifeguards are less confident in paediatric CPR. The overall performance of observed and technical CPR skills, which were mostly ANZCOR guideline compliant, suggests that performance could be improved if paediatric-specific training is provided to supplement the adult-focused methods currently in use. The use of electronic feedback manikins is recommended to address the technical compression and ventilation issues identified in this study.

Chapitre 5. Militarisation et arsenalisation de l'espace extra-atmosphérique : perspectives stratégiques et éthico-juridiques.

According to Carl Schmitt, the antonym of 'The ethics of mankind' contained in outer space law is nomos and polemos, ie the idea that (international) law and politics have as their respective nuclei the sharing of territory and a relation of hostility, both of which combine in conquest, in the sense of taking possession of a territory by the use of armed force. The big question is knowing if outer space escapes or will escape the nomos and polemos, or if it also experiences or will experience the struggle for domination. In order to answer this question, the article examines outer space law concerning the military; then 'the ethics of mankind' vis-à-vis nomos and polemos; finally the militarisation and arsenalisation of outer space, from the angle of anti-missile defences and the relationship to nuclear dissuasion, ie the essence of the problem of defence in outer space.

[Chapter 5. Militarisation and arsenalisation of outer space: strategic and ethico-legal perspectives.] / Chapitre 5. Militarisation et arsenalisation de l'espace extra-atmosphérique : perspectives stratégiques et éthico-juridiques.

According to Carl Schmitt, the antonym of ‘The ethics of mankind’ contained in outer space law is nomos and polemos, ie the idea that (international) law and politics have as their respective nuclei the sharing of territory and a relation of hostility, both of which combine in conquest, in the sense of taking possession of a territory by the use of armed force. The big question is knowing if outer space escapes or will escape the nomos and polemos, or if it also experiences or will experience the struggle for domination. In order to answer this question, the article examines outer space law concerning the military; then ‘the ethics of mankind’ vis-à-vis nomos and polemos; finally the militarisation and arsenalisation of outer space, from the angle of anti-missile defences and the relationship to nuclear dissuasion, ie the essence of the problem of defence in outer space.

Pediatric blood pressures during anesthesia assessed using normalization and principal component analysis techniques.

Expected values for blood pressure are known for both unanesthetized and anesthetized children. The statistics of changes in blood pressure during anesthesia, which may have important diagnostic significance, have not been reported. The purpose of this study was to report the variation in changes in blood pressure in four pediatric age groups, undergoing both cardiac and non-cardiac surgery. An analysis of the changes in blood pressure using normalization and principal component analysis techniques was performed using an existing electronic dataset of intra-arterial pediatric blood pressure values during anesthesia. Cardiac and noncardiac cases were analyzed separately. For 1361 non-cardiac cases, the average systolic blood pressure increased from 55.2 (17.6) mmHg in the first month of life to 85.4 (17.7) mmHg at 5-6 years. For 912 cardiac cases, the average systolic blood pressure increased from 55.7 (16.7) to 71.8 (24.8) mmHg in these cohorts. For non-cardiac cases in the first month, the mean (SD) for change in blood pressure over a 30 s period was 0.00 (8.8), for 5-6 year olds 0.0 (7.4); for cardiac cases, 0.1 (9.2) to - 0.1 (9.2). Variations in systolic blood pressure over a 5-min period were wider: in non-cardiac from 0.1 (12.2) mmHg (first month) to 0.4 (11.5) mmHg (5-6 year old) and from 0.2 (12.5) to 0.4 (14.2) mmHg in cardiac cases. Absolute blood pressures and changes in blood pressure during anesthesia in pediatric cardiac and non-cardiac surgical cases have been analyzed from a population database. Using these values, the quantitative methods of normalization and principal component analysis allow the identification of statistically significant changes.

Information transfer in multidisciplinary operating room teams: a simulation-based observational study.

BACKGROUND: Communication of clinically relevant information between members of the operating room (OR) team is critical for safe patient care. Formal communication processes, such as briefing, sign in and time out, are designed to promote this. AIMS: We investigated patterns of communication of clinically relevant information between OR staff in simulated surgical scenarios, to identify factors associated with effective information sharing. We focused on the influence of precase briefing, sign in and time out, which we defined as formal team communications. METHOD: Twenty teams of six participated in two scenarios during a day-long course. Participants each received unique, clinically relevant items of information (information probes) prior to simulations and were tested postscenario on recall of the information in the probe. Using videos of the simulations, we coded each time an information probe was mentioned against a structured framework. RESULTS: Of the 145 instances where a probe was mentioned at least once, 75 (51.7%) were mentioned during a formal team communication. However, there were 89 instances of a possible 234 (38%) where a probe was never mentioned. Some team members were more likely to mention the information than others. When probes were mentioned during formal team communications, significantly more team members were attentive (1.4 vs 2.3; p<0.001), the information was significantly more likely to be recalled and the team was five times more likely (p=0.01) to recall the information than if the information was only mentioned outside of a formal communication. CONCLUSIONS: While our study supports the value of formal team communications during precase briefing, sign in and time out in the Surgical Safety Checklist, our findings suggest suboptimal transmission of information between team members and unequal contributions of information by different professional groups.

Can team training make surgery safer? Lessons for national implementation of a simulation-based programme.

AIM: Unintended patient harm is a major contributor to poor outcomes for surgical patients and often reflects failures in teamwork. To address this we developed a Multidisciplinary Operating Room Simulation (MORSim) intervention to improve teamwork in the operating room (OR) and piloted it with 20 OR teams in two of the 20 District Health Boards in New Zealand prior to national implementation. In this study, we describe the experience of those exposed to the intervention, challenges to implementing changes in clinical practice and suggestions for successful implementation of the programme at a regional or national level. METHODS: We undertook semi-structured interviews of a stratified random sample of MORSim participants 3-6 months after they attended the course. We explored their experiences of changes in clinical practice following MORSim. Interviews were recorded, transcribed and analysed using a general inductive approach to develop themes into which interview data were coded. Interviews continued to the point of thematic saturation. RESULTS: Interviewees described adopting into practice many of the elements of the MORSim intervention and reported positive experiences of change in communication, culture and collaboration. They described sharing MORSim concepts with colleagues and using them in teaching and orientation of new staff. Reported barriers to uptake included uninterested colleagues, limited team orientation, communication hierarchies, insufficient numbers of staff exposed to MORSim and failure to prioritise time for team information sharing such as pre-case briefings. CONCLUSION: MORSim appears to have had lasting effects on reported attitudes and behaviours in clinical practice consistent with more effective teamwork and communication. This study adds to the accumulating body of evidence on the value of simulation-based team training and offers suggestions for implementing widespread, regular team training for OR teams.

Assessing the similarity of mental models of operating room team members and implications for patient safety: a prospective, replicated study.

BACKGROUND: Patient safety depends on effective teamwork. The similarity of team members' mental models - or their shared understanding-regarding clinical tasks is likely to influence the effectiveness of teamwork. Mental models have not been measured in the complex, high-acuity environment of the operating room (OR), where professionals of different backgrounds must work together to achieve the best surgical outcome for each patient. Therefore, we aimed to explore the similarity of mental models of task sequence and of responsibility for task within multidisciplinary OR teams. METHODS: We developed a computer-based card sorting tool (Momento) to capture the information on mental models in 20 six-person surgical teams, each comprised of three subteams (anaesthesia, surgery, and nursing) for two simulated laparotomies. Team members sorted 20 cards depicting key tasks according to when in the procedure each task should be performed, and which subteam was primarily responsible for each task. Within each OR team and subteam, we conducted pairwise comparisons of scores to arrive at mean similarity scores for each task. RESULTS: Mean similarity score for task sequence was 87 % (range 57-97 %). Mean score for responsibility for task was 70 % (range = 38-100 %), but for half of the tasks was only 51 % (range = 38-69 %). Participants believed their own subteam was primarily responsible for approximately half the tasks in each procedure. CONCLUSIONS: We found differences in the mental models of some OR team members about responsibility for and order of certain tasks in an emergency laparotomy. Momento is a tool that could help elucidate and better align the mental models of OR team members about surgical procedures and thereby improve teamwork and outcomes for patients.

Blood pressure and heart rates in neonates and preschool children: an analysis from 10 years of electronic recording.

BACKGROUND: An acceptable systolic or mean arterial blood pressure for children 0-6 years during anesthesia is unknown. Accepted blood pressures reported in standard charts for healthy awake children may not apply to those undergoing anesthesia. AIM: Our goal was to define observed blood pressures (BP) and heart rate (HR) in children 0-5 years during anesthesia. METHODS: Data from the electronic health record database were available for a 10-year period from June 29, 2005 to July 22, 2015. A simple band-pass filter was applied to remove artifact in the physiologic time-series data for heart rate and blood pressure, with heart rate values 40 or above 250, mean or diastolic blood pressures below 20 or above 200, and systolic blood pressures below 30 or above 200 all excluded. For each anesthetic, the centiles of physiological variables (BP, HR) were calculated. RESULTS: Data were available for 54 896 anesthetics in children 6 years and younger. There were 898 anesthesia reports available that included blood pressure measures immediately before induction. A larger number of anesthesia records (n = 30 008) were available for intraoperative blood pressure recording. The BP decrease after anesthesia induction was most pronounced in infants 0-10 weeks of age where there was a mean arterial blood pressure (MAP) decrease of 16.6-34.5% (mean 28.6%). Systolic blood pressure decreased by 16.3-32.6% (mean 25.5%). Values above a systolic blood pressure of 60 mm Hg were only noted in half the neonates during anesthesia. Heart rates, both before and after anesthesia induction, were similar. CONCLUSION: Heart rate while under anesthesia appears a poor indicator for blood pressure changes. Recorded blood pressures in this current study, measured immediately before induction, were consistent with those in the literature. A mean MAP decrease of 28.6% was typical in those infants 0-10 weeks of age.

Improved scores for observed teamwork in the clinical environment following a multidisciplinary operating room simulation intervention.

AIMS: We ran a Multidisciplinary Operating Room Simulation (MORSim) course for 20 complete general surgical teams from two large metropolitan hospitals. Our goal was to improve teamwork and communication in the operating room (OR). We hypothesised that scores for teamwork and communication in the OR would improve back in the workplace following MORSim. We used an extended Behavioural Marker Risk Index (BMRI) to measure teamwork and communication, because a relationship has previously been documented between BMRI scores and surgical patient outcomes. METHODS: Trained observers scored general surgical teams in the OR at the two study hospitals before and after MORSim, using the BMRI. RESULTS: Analysis of BMRI scores for the 224 general surgical cases before and 213 cases after MORSim showed BMRI scores improved by more than 20% (0.41 v 0.32, p<0.001). Previous research suggests that this improved teamwork score would translate into a clinically important reduction in complications and mortality in surgical patients. CONCLUSIONS: We demonstrated an improvement in scores for teamwork and communication in general surgical ORs following our intervention. These results support the use of simulation-based multidisciplinary team training for OR staff to promote better teamwork and communication, and potentially improve outcomes for general surgical patients.

Multidisciplinary operating room simulation-based team training to reduce treatment errors: a feasibility study in New Zealand hospitals.

AIMS: Communication failures in healthcare are frequent and linked to adverse events and treatment errors. Simulation-based team training has been proposed to address this. We aimed to explore the feasibility of a simulation-based course for all members of the operating room (OR) team, and to evaluate its effectiveness. METHODS: Members of experienced OR teams were invited to participate in three simulated clinical events using an integrated surgical and anesthesia model. We collected information on costs, Behavioural Marker of Risk Index (BMRI) (a measure of team information sharing) and participants' educational gains. RESULTS: We successfully recruited 20 full OR teams. Set up costs were NZ$50,000. Running costs per course were NZ$4,000, excluding staff. Most participants rated the course highly. BMRI improved significantly (P = 0.04) and thematic analysis identified educational gains for participants. CONCLUSION: We demonstrated feasibility of multidisciplinary simulation-based training for surgeons, anesthetists, nurses and anaesthetic technicians. The course showed evidence of participant learning and we obtained useful information on cost. There is considerable potential to extend this type of team-based simulation to improve the performance of OR teams and increase safety for surgical patients.

Measuring the Repeatability of Simulated Physiology in Simulators.

BACKGROUND: In simulation, it may be important in some instances that the physiologic responses to given interventions are substantially repeatable. However, there is no agreed approach to evaluating the repeatability of simulators. We therefore aimed to develop such an approach. METHODS: In repeated simulations, we evaluated the physiologic responses to 7 simple clinical interventions generated by a METI (Medical Education Technologies Incorporated, Sarasota, FL) HPS (Human Patient Simulator) simulator in connected and disconnected states and the screen-based Anesoft Anesthesia Simulator. For a selection of variables, we calculated 3 objective measures of similarity (root mean squared error, median performance error, and median absolute performance error). We also calculated divergence over time and compared 3 preprocessing techniques to reduce the effect of clinically irrelevant phase and frequency differences (simple phase shift, complex phase shift, and dynamic time warping). RESULTS: We collected data from more than 85 hours of simulation time from 255 simulations. The Anesoft physiologic responses were reproduced exactly in each simulation for all variables and interventions. Minor divergence was present between the time series generated with the METI HPS in the connected state but not in the disconnected state. The METI HPS showed some variation between simulations in the raw data. This was most usefully quantified using median absolute performance error as an indicator and was substantially reduced by preprocessing, particularly with dynamic time warping. CONCLUSIONS: The repeatability of the physiologic response of model-controlled simulators to simple standardized interventions can be evaluated by considering divergence over time and the median absolute performance error of individual or pooled variables, but data should be preprocessed to eliminate irrelevant phase and frequency offsets in some variables. Dynamic time warping is an effective method for this purpose.

Expressing concern and writing it down: an experimental study investigating transfer of information at nursing handover.

AIMS: To examine the effects of two factors on the transmission of clinical information at nursing handover. These factors were: (i) an affective statement expressing concern about the information; and (ii) verbal reference to a written summary of the information. BACKGROUND: Quality of communication at patient handover is inconsistent, compromising patient safety. Little is known about the nuances of communication that lead to effective handovers. Furthermore, effective information transmission during handovers is seldom evaluated using experimental research designs. DESIGN: A randomized, single-blind, controlled experiment. METHODS: Postanaesthesia care unit or surgical ward nurses and final-year nursing students were randomly assigned to watch one of four versions of a video-recorded handover. In each version, one piece of information was presented as either a simple statement (control), with an affective qualifier, with a written summary of the information, or with both an affective qualifier and a written summary. Primary outcome was assessed by questionnaire following a task directing attention away from the handover. Data were collected July-October, 2013 and analysed using 2 × 2 anova. RESULTS: A total of 157 nurses participated. Successful transmission of the clinical information did not significantly differ across the experimental conditions. Subgroup analysis revealed significantly higher transmission success among more experienced nurses when the affective statement was present compared to when it was absent (Kruskal-Wallis P = 0·002). CONCLUSIONS: Expressing concern about information or directing attention to written notes may not improve information transfer at handover. However, affective qualifiers may have differential receiver-specific influences on information retention.

Read-back improves information transfer in simulated clinical crises.

BACKGROUND: Safe and effective healthcare is frustrated by failures in communication. Repeating back important information (read-back) is thought to enhance the effectiveness of communication across many industries. However, formal communication protocols are uncommon in healthcare teams. AIMS: We aimed to quantify the effect of read-back on the transfer of information between members of a healthcare team during a simulated clinical crisis. We hypothesised that reading back information provided by other team members would result in better knowledge of that information by the receiver than verbal response without read-back or no verbal response. METHOD: Postanaesthesia care unit nurses and anaesthetic assistants were given clinically relevant items of information at the start of 88 simulations. A clinical crisis prompted calling an anaesthetist, with no prior knowledge of the patient. Using video recordings of the simulations, we noted each time a piece of information was mentioned to the anaesthetist. Their response was coded as read-back, verbal response without read-back or no verbal response. RESULTS: If the anaesthetists read back the item of information, or otherwise verbally responded, they were, respectively, 8.27 (p<0.001) or 3.16 (p=0.03) times more likely to know the information compared with no verbal response. CONCLUSIONS: Our results suggest that training healthcare teams to use read-back techniques could increase information transfer between team members with the potential for improved patient safety. More work is needed to confirm these findings.