Naomi Hammond

Prevalence of Delirium with Dexmedetomidine Compared with Morphine Based Therapy after Cardiac Surgery A Randomized Controlled Trial (DEXmedetomidine COmpared to Morphine-DEXCOM Study)

Background:Commonly used sedatives/analgesics can increase the risk of postoperative complications, including delirium. This double-blinded study assessed the neurobehavioral, hemodynamic, and sedative characteristics of dexmedetomidine compared with morphine-based regimen after cardiac surgery at equivalent levels of sedation and analgesia. Methods:A total of 306 patients at least 60 yr old were randomized to receive dexmedetomidine (0.1–0.7 &mgr;g · kg−1 · h−1) or morphine (10-70 &mgr;g · kg−1 · h−1) with open-label propofol titrated to a target Motor Activity Assessment Scale of 2–4. Primary outcome was the prevalence of delirium measured daily via Confusion Assessment Method for intensive care. Secondary outcomes included ventilation time, additional sedation/analgesia, and hemodynamic and adverse effects. Results:Of all sedation assessments, 75.2% of dexmedetomidine and 79.6% (P = 0.516) of morphine treatment were in the target range. Delirium incidence was comparable between dexmedetomidine 13 (8.6%) and morphine 22 (15.0%) (relative risk 0.571, 95% confidence interval [CI] 0.256–1.099, P = 0.088), however, dexmedetomidine-managed patients spent 3 fewer days (2 [1–7] versus 5 [2–12]) in delirium (95% CI 1.09–6.67, P = 0.0317). The incidence of delirium was significantly less in a small subgroup requiring intraaortic balloon pump and treated with dexmedetomidine (3 of 20 [15%] versus 9 of 25 [36%]) (relative risk 0.416, 95% CI 0.152–0.637, P = 0.001). Dexmedetomidine-treated patients were more likely to be extubated earlier (relative risk 1.27, 95% CI 1.01–1.60, P = 0.040, log-rank P = 0.036), experienced less systolic hypotension (23% versus 38.1%, P = 0.006), required less norepinephrine (P < 0.001), but had more bradycardia (16.45% versus 6.12%, P = 0.006) than morphine treatment. Conclusion:Dexmedetomidine reduced the duration but not the incidence of delirium after cardiac surgery with effective analgesia/sedation, less hypotension, less vasopressor requirement, and more bradycardia versus morphine regimen.

Acetaminophen for Fever in Critically Ill Patients with Suspected Infection.

BACKGROUND Acetaminophen is a common therapy for fever in patients in the intensive care unit (ICU) who have probable infection, but its effects are unknown. METHODS We randomly assigned 700 ICU patients with fever (body temperature, ≥38°C) and known or suspected infection to receive either 1 g of intravenous acetaminophen or placebo every 6 hours until ICU discharge, resolution of fever, cessation of antimicrobial therapy, or death. The primary outcome was ICU-free days (days alive and free from the need for intensive care) from randomization to day 28. RESULTS The number of ICU-free days to day 28 did not differ significantly between the acetaminophen group and the placebo group: 23 days (interquartile range, 13 to 25) among patients assigned to acetaminophen and 22 days (interquartile range, 12 to 25) among patients assigned to placebo (Hodges-Lehmann estimate of absolute difference, 0 days; 96.2% confidence interval [CI], 0 to 1; P=0.07). A total of 55 of 345 patients in the acetaminophen group (15.9%) and 57 of 344 patients in the placebo group (16.6%) had died by day 90 (relative risk, 0.96; 95% CI, 0.66 to 1.39; P=0.84). CONCLUSIONS Early administration of acetaminophen to treat fever due to probable infection did not affect the number of ICU-free days. (Funded by the Health Research Council of New Zealand and others; HEAT Australian New Zealand Clinical Trials Registry number, ACTRN12612000513819.).

The experiences of health care workers employed in an Australian intensive care unit during the H1N1 Influenza pandemic of 2009: A phenomenological study

Abstract Background The H1N1 Influenza A pandemic arrived in Australia in early May 2009. In Queensland, the highest number of H1N1 cases were admitted to the intensive care unit when compared with the other Australian states. While many recent studies examining the H1N1 pandemic have focussed on service delivery and disease epidemiology, few have explored the lived experiences of frontline health care workers caring for the patients in the intensive care unit. Objectives The purposes of this study were to: document and describe the lived experiences of the nursing and medical staff caring for patients in the intensive care unit during the H1N1 pandemic; to validate the staffs’ experiences; and to assist in informing future pandemic planning by highlighting the collective experiences of these frontline health care workers. Design A phenomenological study method was used. Setting and participants 34 staff from a tertiary referral hospital in Brisbane, Australia participated in the study. Methods Data was collected using an open ended questionnaire and focus groups. The resulting responses were analysed using Colaizzis framework to discover regular patterns of meaning that emerged. Results Eight common themes emerged: the wearing of personal protective equipment; infection control procedures; the fear of contracting and transmitting the disease; adequate staffing levels within the intensive care unit; new roles for staff; morale levels; education regarding extracorporeal membrane oxygenation; and the challenges of patient care. These eight themes articulate the lived experience of the staff during the height of the H1N1 Influenza pandemic period. Conclusions Planning for a pandemic situation is invariably difficult due to the unpredictable nature of the event itself. Recommendations for future pandemic planning which can be drawn from this study include the appointment of a dedicated infection control representative to provide information and support regarding infection control matters; the maintenance of effective communication channels is crucial; and the increased staffing requirements across nursing, medical, allied health and ancillary staff to cope with the higher patient numbers and acuity must be anticipated and planned for.

Understanding current intensive care unit nursing handover practices

Clinical handover is critical to clinical decision-making and the provision of safe, high quality, continuing care. Incomplete and inaccurate transfer of information can result in poor outcomes. To assess the content and completeness of the intensive care unit nursing shift-to-shift handover, a prospective, observational study design was used. A semistructured observation sheet based on 10 key principles for handover was used to overtly observe 20 bedside nursing handovers. Descriptive statistics were used to analyse the data. Overall, the content handed over was consistent with the key principles of clinical handover. However, there were some key principles that were minimally addressed or absent from clinical handovers. Development and implementation of a handover tool specific to intensive care will assist in ensuring that all key principles are adhered to so that adverse events associated with miscommunication during clinical handover are reduced and a high standard of care is maintained.

Measurement of the frequency and source of interruptions occurring during bedside nursing handover in the intensive care unit: An observational study

BACKGROUND Effective clinical handover involves the communication of relevant patient information from one care provider to another and is critical in ensuring patient safety. Interruptions may contribute to errors and are potentially a significant barrier to the delivery of effective handovers. OBJECTIVES The study objective was to measure the frequency and source of interruptions during intensive care (ICU) bedside nursing handover. METHODS Twenty observations of bedside handover in an ICU were performed and the frequency and source of interruptions were recorded by the observer for each handover. Observations occurred Monday to Friday during shift change; night to day shift and day to evening shift. Interruptions were defined as a break in performance of an activity. RESULTS The mean handover time was 11 (± 4)min with a range of 5-22 min. The mean number of interruptions was 2 (± 2) per handover with a range of 0-7. The most frequent number of interruptions was seven, occurring during a 15 min handover. Doctors, nurses and alarming intravenous pumps were the most frequent source of interruptions, with administration staff and wards people also disrupting handovers. CONCLUSION Nurses, doctors and alarming intravenous pumps frequently interrupt ICU bedside handovers, which may lead to loss of critical information and result in adverse patient events. Increased knowledge in this area will ensure appropriate strategies are developed and implemented in healthcare areas to manage interruptions effectively and improve patient safety.

Patterns of intravenous fluid resuscitation use in adult intensive care patients between 2007 and 2014: An international cross-sectional study

Background In 2007, the Saline versus Albumin Fluid Evaluation—Translation of Research Into Practice Study (SAFE-TRIPS) reported that 0.9% sodium chloride (saline) and hydroxyethyl starch (HES) were the most commonly used resuscitation fluids in intensive care unit (ICU) patients. Evidence has emerged since 2007 that these fluids are associated with adverse patient-centred outcomes. Based on the published evidence since 2007, we sought to determine the current type of fluid resuscitation used in clinical practice and the predictors of fluid choice and determine whether these have changed between 2007 and 2014. Methods In 2014, an international, cross-sectional study was conducted (Fluid-TRIPS) to document current patterns of intravenous resuscitation fluid use and determine factors associated with fluid choice. We examined univariate and multivariate associations between patients and prescriber characteristics, geographical region and fluid type. Additionally, we report secular trends of resuscitation fluid use in a cohort of ICUs that participated in both the 2007 and 2014 studies. Regression analysis were conducted to determine changes in the administration of crystalloid or colloid between 2007 and 2014. Findings In 2014, a total of 426 ICUs in 27 countries participated. Over the 24 hour study day, 1456/6707 (21.7%) patients received resuscitation fluid during 2716 resuscitation episodes. Crystalloids were administered to 1227/1456 (84.3%) patients during 2208/2716 (81.3%) episodes and colloids to 394/1456 (27.1%) patients during 581/2716 (21.4%) episodes. In multivariate analyses, practice significantly varied between geographical regions. Additionally, patients with a traumatic brain injury were less likely to receive colloid when compared to patients with no trauma (adjusted OR 0.24; 95% CI 0.1 to 0.62; p = 0.003). Patients in the ICU for one or more days where more likely to receive colloid compared to patients in the ICU on their admission date (adjusted OR 1.75; 95% CI 1.27 to 2.41; p = <0.001). For secular trends in fluid resuscitation, 84 ICUs in 17 countries contributed data. In 2007, 527/1663 (31.7%) patients received fluid resuscitation during 1167 episodes compared to 491/1763 (27.9%) patients during 960 episodes in 2014. The use of crystalloids increased from 498/1167 (42.7%) in 2007 to 694/960 (72.3%) in 2014 (odds ratio (OR) 3.75, 95% confidence interval (CI) 2.95 to 4.77; p = <0.001), primarily due to a significant increase in the use of buffered salt solutions. The use of colloids decreased from 724/1167 (62.0%) in 2007 to 297/960 (30.9%) in 2014 (OR 0.29, 95% CI 0.19 to 0.43; p = <0.001), primarily due to a decrease in the use of HES, but an overall increase in the use of albumin. Conclusions Clinical practices of intravenous fluid resuscitation have changed between 2007 and 2014. Geographical location remains a strong predictor of the type of fluid administered for fluid resuscitation. Overall, there is a preferential use of crystalloids, specifically buffered salt solutions, over colloids. There is now an imperative to conduct a trial determining the safety and efficacy of these fluids on patient-centred outcomes. Trial registration Clinicaltrials.gov: Fluid-Translation of research into practice study (Fluid-TRIPS) NCT02002013

End-expiratory lung volume recovers more slowly after closed endotracheal suctioning than after open suctioning: A randomized crossover study

PURPOSE Endotracheal suctioning causes significant lung derecruitment. Closed suction (CS) minimizes lung volume loss during suction, and therefore, volumes are presumed to recover more quickly postsuctioning. Conflicting evidence exists regarding this. We examined the effects of open suction (OS) and CS on lung volume loss during suctioning, and recovery of end-expiratory lung volume (EELV) up to 30 minutes postsuction. MATERIAL AND METHODS Randomized crossover study examining 20 patients postcardiac surgery. CS and OS were performed in random order, 30 minutes apart. Lung impedance was measured during suction, and end-expiratory lung impedance was measured at baseline and postsuctioning using electrical impedance tomography. Oximetry, partial pressure of oxygen in the alveoli/fraction of inspired oxygen ratio and compliance were collected. RESULTS Reductions in lung impedance during suctioning were less for CS than for OS (mean difference, -905 impedance units; 95% confidence interval [CI], -1234 to -587; P < .001). However, at all points postsuctioning, EELV recovered more slowly after CS than after OS. There were no statistically significant differences in the other respiratory parameters. CONCLUSIONS Closed suctioning minimized lung volume loss during suctioning but, counterintuitively, resulted in slower recovery of EELV postsuction compared with OS. Therefore, the use of CS cannot be assumed to be protective of lung volumes postsuctioning. Consideration should be given to restoring EELV after either suction method via a recruitment maneuver.

Genome-wide estimates of inbreeding in unrelated individuals and their association with cognitive ability.

The consequence of reduced cognitive ability from inbreeding has long been investigated, mainly restricted to cousin–cousin marriages. Molecular genetic techniques now allow us to test the relationship between increased ancestral inbreeding and cognitive ability in a population of traditionally unrelated individuals. In a representative UK sample of 2329 individuals, we used genome-wide SNP data to estimate the percentage of the genome covered by runs of homozygous SNPs (ROH). This was tested for association with general cognitive ability, as well as measures of verbal and non-verbal ability. Further, association was tested between these traits and specific ROH. Burden of ROH was not associated with cognitive ability after correction for multiple testing, although burden of ROH was nominally associated with increased non-verbal cognitive ability (P=0.03). Moreover, although no individual ROH was significantly associated with cognitive ability, there was a significant bias towards increased cognitive ability in carriers of ROH (P=0.002). A potential explanation for these results is increased positive assortative mating in spouses with higher cognitive ability, although we found no evidence in support of this hypothesis in a separate sample. Reduced minor allele frequency across the genome was associated with higher cognitive ability, which could contribute to an apparent increase in ROH. This may reflect minor alleles being more likely to be deleterious.

MiR-137-derived polygenic risk: effects on cognitive performance in patients with schizophrenia and controls

Variants at microRNA-137 (MIR137), one of the most strongly associated schizophrenia risk loci identified to date, have been associated with poorer cognitive performance. As microRNA-137 is known to regulate the expression of ~1900 other genes, including several that are independently associated with schizophrenia, we tested whether this gene set was also associated with variation in cognitive performance. Our analysis was based on an empirically derived list of genes whose expression was altered by manipulation of MIR137 expression. This list was cross-referenced with genome-wide schizophrenia association data to construct individual polygenic scores. We then tested, in a sample of 808 patients and 192 controls, whether these risk scores were associated with altered performance on cognitive functions known to be affected in schizophrenia. A subgroup of healthy participants also underwent functional imaging during memory (n=108) and face processing tasks (n=83). Increased polygenic risk within the empirically derived miR-137 regulated gene score was associated with significantly lower performance on intelligence quotient, working memory and episodic memory. These effects were observed most clearly at a polygenic threshold of P=0.05, although significant results were observed at all three thresholds analyzed. This association was found independently for the gene set as a whole, excluding the schizophrenia-associated MIR137 SNP itself. Analysis of the spatial working memory fMRI task further suggested that increased risk score (thresholded at P=10−5) was significantly associated with increased activation of the right inferior occipital gyrus. In conclusion, these data are consistent with emerging evidence that MIR137 associated risk for schizophrenia may relate to its broader downstream genetic effects.

The status of trauma registry systems in Chinese hospitals

Injuries are a major source of mortality and morbidity in China with approximately 66 million citizens requiring emergency medical care. Trauma registries provide the basis for quality assurance processes and inform the treatment of the injured patient. Against the backdrop of the recently established Chinese National Injury Surveillance System, the feasibility of establishing a multicentre trauma registry in a limited number of hospitals was examined. Seven hospital directors reported on a range of hospital characteristics including patient volume information and the types of patient information routinely collected. The findings indicate significant numbers of patients presenting due to injury, though little comparability in the type of information collected both between hospitals and with international trauma registry systems. The development of multicentre trauma registry is suggested as a way to monitor trauma system performance. The integration of clinical indicators into the National Injury Surveillance System in the long term is also recommended.