Amy J. Spooner

Nasal high flow oxygen therapy in patients with COPD reduces respiratory rate and tissue carbon dioxide while increasing tidal and end-expiratory lung volumes: a randomised crossover trial

Abstract Patients with COPD using long-term oxygen therapy (LTOT) over 15 h per day have improved outcomes. As inhalation of dry cold gas is detrimental to mucociliary clearance, humidified nasal high flow (NHF) oxygen may reduce frequency of exacerbations, while improving lung function and quality of life in this cohort. In this randomised crossover study, we assessed short-term physiological responses to NHF therapy in 30 males chronically treated with LTOT. LTOT (2–4 L/min) through nasal cannula was compared with NHF at 30 L/min from an AIRVO through an Optiflow nasal interface with entrained supplemental oxygen. Comparing NHF with LTOT: transcutaneous carbon dioxide (TcCO2) (43.3 vs 46.7 mm Hg, p<0.001), transcutaneous oxygen (TcO2) (97.1 vs 101.2 mm Hg, p=0.01), I:E ratio (0.75 vs 0.86, p=0.02) and respiratory rate (RR) (15.4 vs 19.2 bpm, p<0.001) were lower; and tidal volume (Vt) (0.50 vs 0.40, p=0.003) and end-expiratory lung volume (EELV) (174% vs 113%, p<0.001) were higher. EELV is expressed as relative change from baseline (%Δ). Subjective dyspnoea and interface comfort favoured LTOT. NHF decreased TcCO2, I:E ratio and RR, with a concurrent increase in EELV and Vt compared with LTOT. This demonstrates a potential mechanistic rationale behind the improved outcomes observed in long-term treatment with NHF in oxygen-dependent patients. Trial registration number ACTRN12613000028707.

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.

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.

PC6 acupoint stimulation for the prevention of postcardiac surgery nausea and vomiting: a protocol for a two-group, parallel, superiority randomised clinical trial

Introduction Postoperative nausea and vomiting (PONV) are frequent but unwanted complications for patients following anaesthesia and cardiac surgery, affecting at least a third of patients, despite pharmacological treatment. The primary aim of the proposed research is to test the efficacy of PC6 acupoint stimulation versus placebo for reducing PONV in cardiac surgery patients. In conjunction with this we aim to develop an understanding of intervention fidelity and factors that support, or impede, the use of PC6 acupoint stimulation, a knowledge translation approach. Methods and analysis 712 postcardiac surgery participants will be recruited to take part in a two-group, parallel, superiority, randomised controlled trial. Participants will be randomised to receive a wrist band on each wrist providing acupressure to PC six using acupoint stimulation or a placebo. Randomisation will be computer generated, use randomly varied block sizes, and be concealed prior to the enrolment of each patient. The wristbands will remain in place for 36 h. PONV will be evaluated by the assessment of both nausea and vomiting, use of rescue antiemetics, quality of recovery and cost. Patient satisfaction with PONV care will be measured and clinical staff interviewed about the clinical use, feasibility, acceptability and challenges of using acupressure wristbands for PONV. Ethics and dissemination Ethics approval will be sought from appropriate Human Research Ethics Committee/s before start of the study. A systematic review of the use of wrist acupressure for PC6 acupoint stimulation reported minor side effects only. Study progress will be reviewed by a Data Safety Monitoring Committee (DSMC) for nausea and vomiting outcomes at n=350. Dissemination of results will include conference presentations at national and international scientific meetings and publications in peer-reviewed journals. Study participants will receive a one-page lay-summary of results. Trial registration number Australian New Zealand Clinical Trials Registry—ACTRN12614000589684.

The quality of intensive care unit nurse handover related to end of life: A descriptive comparative international study

BACKGROUND Quality ICU end-of-life-care has been found to be related to good communication. Handover is one form of communication that can be problematic due to lost or omitted information. A first step in improving care is to measure and describe it. OBJECTIVE The objective of this study was to describe the quality of ICU nurse handover related to end-of-life care and to compare the practices of different ICUs in three different countries. DESIGN This was a descriptive comparative study. SETTINGS The study was conducted in seven ICUs in three countries: Australia (1 unit), Israel (3 units) and the UK (3 units). PARTICIPANTS A convenience sample of 157 handovers was studied. METHODS Handover quality was rated based on the ICU End-of-Life Handover tool, developed by the authors. RESULTS The highest levels of handover quality were in the areas of goals of care and pain management while lowest levels were for legal issues (proxy and advanced directives) related to end of life. Significant differences were found between countries and units in the total handover score (country: F(2,154)=25.97, p=<.001; unit: F(6,150)=58.24, p=<.001), for the end of life subscale (country: F(2, 154)=28.23, p<.001; unit: F(6,150)=25.25, p=<.001), the family communication subscale (country: F(2,154)=15.04, p=<.001; unit: F(6,150)=27.38, p=<.001), the family needs subscale (F(2,154)=22.33, p=<.001; unit: F(6,150)=42.45, p=<.001) but only for units on the process subscale (F(6,150)=8.98, p=<.001. The total handover score was higher if the oncoming RN did not know the patient (F(1,155)=6.51, p=<.05), if the patient was expected to die during the shift (F(1,155)=89.67, p=<.01) and if the family were present (F(1,155)=25.81, p=<.01). CONCLUSIONS Practices of end-of-life-handover communication vary greatly between units. However, room for improvement exists in all areas in all of the units studied. The total score was higher when quality of care might be deemed at greater risk (if the nurses did not know the patient or the patient was expected to die), indicating that nurses were exercising some form of discretionary decision making around handover communication; thus validating the measurement tool.

A 4-arm randomized controlled pilot trial of innovative solutions for jugular central venous access device securement in 221 cardiac surgical patients

PURPOSE To improve jugular central venous access device (CVAD) securement, prevent CVAD failure (composite: dislodgement, occlusion, breakage, local or bloodstream infection), and assess subsequent trial feasibility. MATERIALS AND METHODS Study design was a 4-arm, parallel, randomized, controlled, nonblinded, pilot trial. Patients received CVAD securement with (i) suture+bordered polyurethane (suture + BPU; control), (ii) suture+absorbent dressing (suture + AD), (iii) sutureless securement device+simple polyurethane (SSD+SPU), or (iv) tissue adhesive+simple polyurethane (TA+SPU). Midtrial, due to safety, the TA+SPU intervention was replaced with a suture + TA+SPU group. RESULTS A total of 221 patients were randomized with 2 postrandomization exclusions. Central venous access device failure was as follows: suture + BPU controls, 2 (4%) of 55 (0.52/1000 hours); suture + AD, 1 (2%) of 56 (0.26/1000 hours, P=.560); SSD+SPU, 4 (7%) of 55 (1.04/1000 hours, P=.417); TA+SPU, 4 (17%) of 23 (2.53/1000 hours, P=.049); and suture + TA+SPU, 0 (0%) of 30 (P=.263; intention-to-treat, log-rank tests). Central venous access device failure was predicted (P<.05) by baseline poor/fair skin integrity (hazard ratio, 9.8; 95% confidence interval, 1.2-79.9) or impaired mental state at CVAD removal (hazard ratio, 14.2; 95% confidence interval, 3.0-68.4). CONCLUSIONS Jugular CVAD securement is challenging in postcardiac surgical patients who are coagulopathic and mobilized early. TA+SPU was ineffective for CVAD securement and is not recommended. Suture + TA+SPU appeared promising, with zero CVAD failure observed. Future trials should resolve uncertainty about the comparative effect of suture + TA+SPU, suture + AD, and SSD+SPU vs suture + BPU.

Lung Volume Changes During Cleaning of Closed Endotracheal Suction Catheters: A Randomized Crossover Study Using Electrical Impedance Tomography

BACKGROUND: Airway suctioning in mechanically ventilated patients is required to maintain airway patency. Closed suction catheters (CSCs) minimize lung volume loss during suctioning but require cleaning post-suction. Despite their widespread use, there is no published evidence examining lung volumes during CSC cleaning. The study objectives were to quantify lung volume changes during CSC cleaning and to determine whether these changes were preventable using a CSC with a valve in situ between the airway and catheter cleaning chamber. METHODS: This prospective randomized crossover study was conducted in a metropolitan tertiary ICU. Ten patients mechanically ventilated via volume-controlled synchronized intermittent mandatory ventilation (SIMV-VC) and requiring manual hyperinflation (MHI) were included in this study. CSC cleaning was performed using 2 different brands of CSC (one with a valve [Ballard Trach Care 72, Kimberly-Clark, Roswell, Georgia] and one without [Portex Steri-Cath DL, Smiths Medical, Dublin, Ohio]). The maneuvers were performed during both SIMV-VC and MHI. Lung volume change was measured via impedance change using electrical impedance tomography. A mixed model was used to compare the estimated means. RESULTS: During cleaning of the valveless CSC, significant decreases in lung impedance occurred during MHI (−2563 impedance units, 95% CI 2213–2913, P < .001), and significant increases in lung impedance occurred during SIMV (762 impedance units, 95% CI 452–1072, P < .001). In contrast, cleaning of the CSC with a valve in situ resulted in non-significant lung volume changes and maintenance of normal ventilation during MHI and SIMV-VC, respectively (188 impedance units, 95% CI −136 to 511, P = .22; and 22 impedance units, 95% CI −342 to 299, P = .89). CONCLUSIONS: When there is no valve between the airway and suction catheter, cleaning of the CSC results in significant derangements in lung volume. Therefore, the presence of such a valve should be considered essential in preserving lung volumes and uninterrupted ventilation in mechanically ventilated patients.

Head-of-Bed Elevation Improves End-Expiratory Lung Volumes in Mechanically Ventilated Subjects: A Prospective Observational Study

BACKGROUND: Head-of-bed elevation (HOBE) has been shown to assist in reducing respiratory complications associated with mechanical ventilation; however, there is minimal research describing changes in end-expiratory lung volume. This study aims to investigate changes in end-expiratory lung volume in a supine position and 2 levels of HOBE. METHODS: Twenty postoperative cardiac surgery subjects were examined using electrical impedance tomography. End-expiratory lung impedance (EELI) was recorded as a surrogate measurement of end-expiratory lung volume in a supine position and at 20° and then 30°. RESULTS: Significant increases in end-expiratory lung volume were seen at both 20° and 30° HOBE in all lung regions, except the anterior, with the largest changes from baseline (supine) seen at 30°. From baseline to 30° HOBE, global EELI increased by 1,327 impedance units (95% CI 1,080–1,573, P < .001). EELI increased by 1,007 units (95% CI 880–1,134, P < .001) in the left lung region and by 320 impedance units (95% CI 188–451, P < .001) in the right lung. Posterior increases of 1,544 impedance units (95% CI 1,405–1,682, P < .001) were also seen. EELI decreased anteriorly, with the largest decreases occurring at 30° (−335 impedance units, 95% CI −486 to −183, P < .001). CONCLUSIONS: HOBE significantly increases global and regional end-expiratory lung volume; therefore, unless contraindicated, all mechanically ventilated patients should be positioned with HOBE.

Are pressure injuries related to skin failure in critically ill patients

BACKGROUND Pressure injuries contribute significantly to patient morbidity and healthcare costs. Critically ill patients are a high risk group for pressure injury development and may suffer from skin failure secondary to hypoperfusion. The aim of this study was to report hospital acquired pressure injury incidence in intensive care and non-intensive care patients; and assess the clinical characteristics and outcomes of ICU patients reported as having a hospital acquired pressure injury to better understand patient factors associated with their development in comparison to ward patients. METHODS The setting for this study was a 630 bed, government funded, tertiary referral teaching hospital. A secondary data analysis was undertaken on all patients with a recorded PI on the hospitals critical incident reporting systems and admitted patient data collection between July 2006 to March 2015. RESULTS There were a total of 5280 reports in 3860 patients; 726 reports were intensive care patients and 4554 were non-intensive care patients, with severe hospital acquired PI reported in 22 intensive care patients and 54 non-intensive care patients. Pressure injury incidence increased in intensive care patients and decreased in non-intensive care patients over the study period. There were statistically significant differences in the anatomical location of severe hospital acquired pressure injuries between these groups (p=0.008). CONCLUSION Intensive care patients have greater than 10-fold higher hospital acquired pressure injury incidence rates compared to other hospitalised patients. The predisposition of critically ill patients leaves them susceptible to pressure injury development despite implementation of pressure injury prevention strategies. Skin failure appears to be a significant phenomenon in critically ill patients and is associated with the use of vasoactive agents and support systems such as extra corporeal membrane oxygenation and mechanical ventilation.