Capnodynamic monitoring of lung volume and blood flow in response to increased positive end-expiratory pressure in moderate to severe COVID-19 pneumonia: an observational study.

BACKGROUND: The optimal level of positive end-expiratory pressure (PEEP) during mechanical ventilation for COVID-19 pneumonia remains debated and should ideally be guided by responses in both lung volume and perfusion. Capnodynamic monitoring allows both end-expiratory lung volume ([Formula: see text]) and effective pulmonary blood flow (EPBF) to be determined at the bedside with ongoing ventilation. METHODS: Patients with COVID-19-related moderate to severe respiratory failure underwent capnodynamic monitoring of [Formula: see text] and EPBF during a step increase in PEEP by 50% above the baseline (PEEPlow to PEEPhigh). The primary outcome was a > 20 mm Hg increase in arterial oxygen tension to inspired fraction of oxygen (P/F) ratio to define responders versus non-responders. Secondary outcomes included changes in physiological dead space and correlations with independently determined recruited lung volume and the recruitment-to-inflation ratio at an instantaneous, single breath decrease in PEEP. Mixed factor ANOVA for group mean differences and correlations by Pearson's correlation coefficient are reported including their 95% confidence intervals. RESULTS: Of 27 patients studied, 15 responders increased the P/F ratio by 55 [24-86] mm Hg compared to 12 non-responders (p < 0.01) as PEEPlow (11 ± 2.7 cm H2O) was increased to PEEPhigh (18 ± 3.0 cm H2O). The [Formula: see text] was 461 [82-839] ml less in responders at PEEPlow (p = 0.02) but not statistically different between groups at PEEPhigh. Responders increased both [Formula: see text] and EPBF at PEEPhigh (r = 0.56 [0.18-0.83], p = 0.03). In contrast, non-responders demonstrated a negative correlation (r = - 0.65 [- 0.12 to - 0.89], p = 0.02) with increased lung volume associated with decreased pulmonary perfusion. Decreased (- 0.06 [- 0.02 to - 0.09] %, p < 0.01) dead space was observed in responders. The change in [Formula: see text] correlated with both the recruited lung volume (r = 0.85 [0.69-0.93], p < 0.01) and the recruitment-to-inflation ratio (r = 0.87 [0.74-0.94], p < 0.01). CONCLUSIONS: In mechanically ventilated patients with moderate to severe COVID-19 respiratory failure, improved oxygenation in response to increased PEEP was associated with increased end-expiratory lung volume and pulmonary perfusion. The change in end-expiratory lung volume was positively correlated with the lung volume recruited and the recruitment-to-inflation ratio. This study demonstrates the feasibility of capnodynamic monitoring to assess physiological responses to PEEP at the bedside to facilitate an individualised setting of PEEP. TRIAL REGISTRATION: NCT05082168 (18th October 2021).

A critical care pandemic staffing framework in Australia.

BACKGROUND: Pandemics and the large-scale outbreak of infectious disease can significantly impact morbidity and mortality worldwide. The impact on intensive care resources can be significant and often require modification of service delivery, a key element which includes rapid expansion of the critical care workforce. Pandemics are also unpredictable, which necessitates rapid decision-making and action which, in the lack of experience and guidance, may be extremely challenging. Recognising the potential strain on intensive care units (ICUs), particularly on staffing, a working group was formed for the purpose of developing recommendations to support decision-making during rapid service expansion. METHODS: The Critical Care Pandemic Staffing Working Party (n = 21), representing nursing, allied health, and medical disciplines, has used a modified consensus approach to provide recommendations to inform multidisciplinary workforce capacity expansion planning in critical care. RESULTS: A total of 60 recommendations have been proposed which reflect general recommendations as well as those specific to maintaining the critical care workforce, expanding the critical care workforce, rostering and allocation of the critical care workforce, nurse-specific recommendations for staffing the ICU, education support and training during ICU surge situations, workforce support, models of care, and de-escalation. CONCLUSION: These recommendations are provided with the intent that they be used to guide interdisciplinary decision-making, and we suggest that careful consideration is given to the local context to determine which recommendations are most appropriate to implement and how they are prioritised. Ongoing evaluation of recommendation implementation and impact will be necessary, particularly in rapidly changing clinical contexts.

Post-operative renal failure management in mechanical circulatory support patients.

Acute kidney injury (AKI) occurs commonly in patients requiring mechanical circulatory support (MCS) after cardiothoracic surgery. The prognostic implications of AKI in this patient group relate closely to the pathophysiology and risk factors associated with the underlying disease; pre-operative, intra-operative, and post-operative variables; hemodynamic factors; and type of support device used. General approaches to AKI management, including prevention strategies, medical management, and hemodynamic support, are also applicable in patients requiring MCS. Approaches to renal replacement therapy vary depend on patient factors, device-specific factors, and local preferences and experience. In this invited narrative review, we discuss the pathophysiology, risk factors, and prognostic implications of AKI in post-operative adult patients following institution of MCS. Management strategies for AKI are presented with a focus on those supported with either extracorporeal membrane oxygenation or a ventricular assist device.

ANZICS guiding principles for complex decision making during the COVID-19 pandemic.

The global 2019 coronavirus disease (COVID-19) pandemic has led to major challenges in clinical decision making when the demand for intensive care exceeds local capacity. In order to promote consistent, transparent, objective and ethical decision making, the Australian and New Zealand Intensive Care Society (ANZICS) formed a committee to urgently develop guidelines outlining key principles that should be utilised during the pandemic. This guidance is intended to support the practice of intensive care specialists during the COVID-19 pandemic and to promote the development of local admission policies that should be endorsed by health care organisations and relevant local authorities.

Development and Review of the Chest Tube High-Feedback Educational Simulation Trainer (CHEST).

INTRODUCTION: Emergency medicine physicians must receive training in chest tube placement. This life-saving skill must be completed quickly and competently to prevent morbidity and mortality. Training on live patients is no longer an appropriate or acceptable practice. Current training devices have been noted to be costly, may be difficult to store, or may require time-consuming cleanup or setup. METHODS: Fifteen Chest tube High-feedback Educational Simulation Trainers were created. Frames were made from wood and PVC, and soft tissue layers were designed using silicone and polyurethane foam. Nine training sites volunteered to test the model and provided feedback on the acceptability of the task trainer for skill training. RESULTS: Survey findings demonstrated that the model was realistic for teaching, portable, and was easy to use and maintain. In our model, the outer skin was noted to tear easily, thus limiting its use for suture training. Overall programs reported that they would use this model if it was available for the same or lower cost than current models. CONCLUSIONS: An inexpensive task trainer was created that was easy to store, quick to set up, durable, easy to clean, and rated as effective at training the skill of chest tube insertion.

Mass casualty incidents and B-Con training.

OBJECTIVE: The purpose of this study was to determine if providing mass casualty training, utilizing the Bleeding Control for the Injured (B-Con) course would allow participants to feel more confident to provide bystander aid to wounded victims in a mass casualty incident (MCI). DESIGN: Quasi-experimental pre-post intervention study. SETTING: Participants were healthcare providers attending a trauma research conference hosted by a medical university. INTERVENTIONS: Participants were given a group lecture in each of the three B-Con skill areas. These include: bleeding control with a tourniquet, bleeding control with gauze, and airway control with a jaw thrust. Participants were then divided into three groups and practiced each skill with instruction from B-Con certified trainers. MAIN OUTCOMES MEASURES: The primary outcome was scores from pre- to post-intervention in the categories of self-efficacy, perceived benefit, perceived susceptibility, perceived barriers, and perceived severity related to involvement in an MCI. RESULTS: The study included 67 participants, all identifying as medical providers. Means in the categories of self-efficacy, perceived benefit, perceived susceptibility, perceived barriers, and perceived severity significantly increased from pre-intervention to post-intervention among the paired variables. CONCLUSIONS: This study demonstrates the effectiveness of B-Con training in improving the confidence of participants. By increasing the number of persons who are trained for an MCI, there will be an increased probability that triage and immediate care will be rendered when needed. Future research needs to be completed evaluating the effect of training on a layperson study sample.

Nosocomial infections acquired by patients treated with extracorporeal membrane oxygenation.

BACKGROUND: Infectious complications in patients treated with extracorporeal membrane oxygenation (ECMO) are a frequent contributor to morbidity and mortality in this group. Defining the characteristics of ECMO-related infections may inform treatment decisions, including antimicrobial therapy. METHODS: A retrospective observational study in an Australian intensive care unit, including adult patients treated with ECMO for at least 48 hours, over a 3-year period. Medical records were analysed for evidence of bloodstream infections (BSIs) and wound infections (WIs) at the ECMO cannulation site or the sternum. Demographic, ECMO-related and clinical data were collected, including inpatient antibiotic usage. RESULTS: We included 98 patients in the study. The median age was 50 years (IQR, 39-57 years). The median duration of ECMO treatment was 6.6 days (IQR, 4.0-12.8 days). Twenty-four infections were diagnosed in 21 patients; eight patients were diagnosed with BSIs on ECMO, 14 developed cannulation-site WIs, and two patients developed sternal wound infections. On multivariate analysis, we found that factors that increased infection risk included immunosuppression (OR, 2.9; P = 0.04) and treatment with venoarterial (VA) ECMO (OR, 14.7; P = 0.01). Infected patients had a significantly longer duration of hospital admission than patients without BSI or WI (55 days v 30 days; P = 0.03). Prior antibiotic use did not appear to be protective against subsequent infection. CONCLUSIONS: Infectious complications are common in ECMO patients and are associated with longer durations of hospital admission. Isolated pathogens were predominantly hospital-acquired Gram-negative bacteria and yeasts. Immunosuppression and treatment with VA ECMO were found to be specific risk factors for infection.

Current trends in the surgical treatment of pediatric ovarian torsion: we can do better.

INTRODUCTION: Current literature strongly recommends ovarian preservation for pediatric patients with ovarian torsion. The purpose of this study was to evaluate national trends in the surgical management of pediatric ovarian torsion and to compare outcomes between pediatric surgeons (PED) and gynecologists (GYN). METHODS: We queried Pediatric Health Information System (PHIS) data from 2007 to 2011 for patients <18years old with a diagnosis of ovarian torsion who underwent a surgical procedure. Patients with malignant disease were excluded. Outcomes were compared between pediatric surgeons and gynecologists. RESULTS: A total of 1151 patients were identified with a mean age of 10.7±4.1years with a bimodal distribution. Pediatric surgeons performed the majority of procedures (81%) and were more likely to use a laparoscopic approach (PED 27% vs. GYN 17%, p<.05). Pediatric surgeons were more likely to perform an oophorectomy (PED 38% vs. GYN 27%, p<.01), and more likely to administer antibiotics for this clean procedure (PED 61% vs. GYN 29%, p<.001). The overall reoperation rate was 5.1% and did not differ significantly by subspecialty (PED 4.4% vs. GYN 7.8%, p>.05). CONCLUSIONS: These data demonstrate a significant opportunity for pediatric surgeons and gynecologists to improve ovarian salvage rates and to reduce unnecessary antibiotic utilization for children with ovarian torsion.