Prone Position Ventilation in Severe ARDS due to COVID-19: Comparison between Prolonged and Intermittent Strategies

Ventilation in a prone position (PP) for 12 to 16 h per day improves survival in ARDS. However, the optimal duration of the intervention is unknown. We performed a prospective observational study to compare the efficacy and safety of a prolonged PP protocol with conventional prone ventilation in COVID-19-associated ARDS. Prone position was undertaken if P/F < 150 with FiO₂ > 0.6 and PEEP > 10 cm H₂O. Oxygenation parameters and respiratory mechanics were recorded before the first PP cycle, at the end of the PP cycle and 4 h after supination. We included 63 consecutive intubated patients with a mean age of 63.5 years. Of them, 37 (58.7%) underwent prolonged prone position (PPP group) and 26 (41.3%) standard prone position (SPP group). The median cycle duration for the SPP group was 20 h and for the PPP group 46 h (p < 0.001). No significant differences in oxygenation, respiratory mechanics, number of PP cycles and rate of complications were observed between groups. The 28-day survival was 78.4% in the PPP group versus 65.4% in the SPP group (p = 0.253). Extending the duration of PP was as safe and efficacious as conventional PP, but did not confer any survival benefit in a cohort of patients with severe ARDS due to COVID-19.

Physiologic effects of stress dose corticosteroids in in-hospital cardiac arrest (CORTICA): A randomized clinical trial

Aim

Postresuscitation hemodynamics are associated with hospital mortality/functional outcome. We sought to determine whether low-dose steroids started during and continued after cardiopulmonary resuscitation (CPR) affect postresuscitation hemodynamics and other physiological variables in vasopressor-requiring, in-hospital cardiac arrest.

Methods

We conducted a two-center, randomized, double-blind trial of patients with adrenaline (epinephrine)-requiring cardiac arrest. Patients were randomized to receive either methylprednisolone 40 mg (steroids group) or normal saline-placebo (control group) during the first CPR cycle post-enrollment. Postresuscitation shock was treated with hydrocortisone 240 mg daily for 7 days maximum and gradual taper (steroids group), or saline-placebo (control group). Primary outcomes were arterial pressure and central-venous oxygen saturation (ScvO₂) within 72 hours post-ROSC.

Results

Eighty nine of 98 controls and 80 of 86 steroids group patients with ROSC were treated as randomized. Primary outcome data were collected from 100 patients with ROSC (control, n = 54; steroids, n = 46). In intention-to-treat mixed-model analyses, there was no significant effect of group on arterial pressure, marginal mean (95% confidence interval) for mean arterial pressure, steroids vs. control: 74 (68–80) vs. 72 (66–79) mmHg] and ScvO₂ [71 (68–75)% vs. 69 (65–73)%], cardiac index [2.8 (2.5–3.1) vs. 2.9 (2.5–3.2) L/min/m²], and serum cytokine concentrations [e.g. interleukin-6, 89.1 (42.8–133.9) vs. 75.7 (52.1–152.3) pg/mL] determined within 72 hours post-ROSC (P = 0.12–0.86). There was no between-group difference in body temperature, echocardiographic variables, prefrontal blood flow index/cerebral autoregulation, organ failure-free days, and hazard for poor in-hospital/functional outcome, and adverse events (P = 0.08–>0.99).

Conclusions

Our results do not support the use of low-dose corticosteroids in in-hospital cardiac arrest.

Trial Registration:ClinicalTrials.gov number: NCT02790788 (https://www.clinicaltrials.gov).

Micronutrient dietary intakes and their food sources in adults: the Hellenic National Nutrition and Health Survey (HNNHS)

BACKGROUND

The present study aimed to assess micronutrient intake among Greek adults and to identify the main food sources that contribute to it.

METHODS

Food consumption data from 2389 participants in the Hellenic National Nutrition and Health Survey (HNNHS), collected with 24-h recalls, was used to calculate micronutrient intakes. Usual nutrient intake was estimated according to the National Cancer Institute method. Nutrient adequacy was estimated using the estimated average requirement (EAR) cut-point method, when available, or adequate intake otherwise. The probability approach was used to determine iron intake adequacy in females of reproductive age. Food group contribution for each nutrient assessed was derived to identify their main food sources.

RESULTS

Almost all individuals had vitamin D intake below EAR, whereas vitamins A, E, K and C, as well as potassium intake, were also insufficient in a considerable percentage of the population (>70% in most age groups). Calcium intake was substantially below the EAR for females aged >50 years and males >70 years; the same for magnesium in males >70 years. Furthermore, 50% of females, including those of reproductive age, had intake of folate below EAR. More than 50% of the population (to 79%) exceeded the upper tolerable limit for sodium (2300 mg day^-1 ). Food contribution analysis revealed that most vitamins were derived from low-quality foods (i.e. fast-food).

CONCLUSIONS

A significant proportion of adults residing in Greece have low nutrient intake and poor food selections. These results provide guidance to public health policy makers for developing strategies to improve the dietary quality in Greece.

Oxygen therapy practices in the acutely ill medical patients: A social media-based nationwide study of clinicians’ preferences and summary of current recommendations

Oxygen is the most commonly used drug in emergency medicine. The aim of this study was to identify healthcare professionals’ preferences regarding oxygen therapy in common medical emergencies. An online 9-part-questionnaire was distributed through Facebook to doctors and nurses working in Greek hospitals. The questionnaire included background information of the respondents and addressed individual preferences regarding best oxygenation parameter and oxygen targets in specific acute settings. We received 678 responses and we included 663 in our analysis. We found significant differences between doctors’ and nurses’ attitudes towards oxygenation targets in ARDS, sepsis, acute coronary syndrome, and post cardiac-arrest patients. Nurses preferred a more conservative oxygen strategy compared to doctors. Furthermore, nurses favor SaO2 as the best oxygenation parameter, while doctors prefer PaO2. In our survey, the type of hospital and department of the respondents did not affect the preferred oxygen strategy. Social media-based survey research is feasible and effective. In this single country study, doctors showed a tendency to liberally administer oxygen in acutely ill medical patients. On the other hand, Greek nurses preferred a more conservative approach.

Usefulness of F2-isoprostanes in early prognostication after cardiac arrest: a topical review of the literature and meta-analysis of preclinical data

Prognostication after cardiac arrest (CA) represents a challenging issue, and several biomarkers have been proposed in the attempt to predict outcome. Among these, F2-isoprostanes stand out as potential biomarkers for early prognostication, providing information on the magnitude of global oxidative injury after return of spontaneous circulation (ROSC). We performed a topical review searching PubMed and Scopus databases to identify studies evaluating the modifications of F2-isoprostanes in the early period after CA, and a meta-analysis of studies providing curves of F2-isoprostanes plasma levels seeking to describe the biomarker's kinetics after CA. Evidence suggests that plasma levels of F2-isoprostanes increase in the early post-resuscitation period and seem well correlated with the burden of ischaemia-reperfusion injury. Our meta-analysis shows a possible increase as early as 5 minutes after ROSC, which persists at 2 hours and is attenuated at 4 hours. Clinical studies are warranted to evaluate the utility of this biomarker for prognostication purposes in CA survivors.

Drugs in cardiac arrest: the rise and fall of antiarrhythmics

Since the publication of 2000 guidelines for resuscitation, amiodarone is considered the antiarrhythmic drug of choice for refractory ventricular fibrillation/pulseless ventricular tachycardia. However, to date there is no proven benefit in terms of neurologically intact survival to hospital discharge. A comprehensive search of the recent literature on amiodarone, nifekalant and lidocaine in cardiac arrest was performed. Amiodarone and nifekalant are superior to lidocaine with regards to the return of spontaneous circulation and survival to hospital admission. Nifekalant shows a trend towards quicker termination of ventricular fibrillation compared to amiodarone. There is great uncertainty about the efficacy of antiarrhythmics in cardiac arrest. Failure to show improvements regarding meaningful survival questions their current use and suggests the need for re-evaluating their place in cardiopulmonary resuscitation.

Induction of anaesthesia with remifentanil after bolus midazolam administration in Landrace/Large White swine

OBJECTIVE

To investigate an alternative combination for anaesthesia induction in swine.

STUDY DESIGN

Randomized, 'blinded' experimental study.

ANIMALS

Forty-five Landrace/Large White swine weighing 20.0±1.5 kg.

METHODS

Pulse oximetry, heart rate (HR) and blood pressure were measured after premedication with ketamine, midazolam and atropine as well as after intubation following induction with a fixed dose of 0.2 mg kg^-1 midazolam combined with 1, 2, 3, 4 or 5 μg kg^-1 remifentanil (groups R1, R2, R3, R4 and R5, respectively). Intubation was evaluated using a numerical scoring system assessing jaw relaxation, resistance to the laryngoscope, vocal cord position, vocal cord movement and response to intubation. The time required to intubate and necessity for an additional midazolam dose were recorded. Baseline and post-intubation variables were compared with paired t tests, whereas for differences between the remifentanil groups the Spearman's rank correlation coefficient was estimated. Multivariate regression analysis was performed to disentangle the effect of remifentanil dose and the additional midazolam.

RESULTS

Higher dose of remifentanil was associated with better vocal cord position (p<0.001), better response to intubation (p<0.001), shorter time required for intubation (p=0.030) and less frequent necessity for additional administration of midazolam (p=0.004). In total, 39.5% of the animals required additional midazolam. In groups R1, R4 and R5, there were decreases in HRs (p=0.009, p=0.008 and p=0.032, respectively) between baseline and post-intubation phase; in groups R3 and R4, there were decreases in systolic blood pressure (p=0.040 and p=0.019, respectively). In the multivariate analysis, remifentanil dose was not associated with the observed changes in haemodynamic variables. One animal developed apnoea and four electrocardiographic anomalies; all resolved without pharmaceutical interventions.

CONCLUSIONS AND CLINICAL RELEVANCE

A combination of 0.2 mg kg^-1 midazolam with 4 or 5 μg kg^-1 remifentanil may provide an alternative method of anaesthesia induction for swine.

Correlation of Impedance Threshold Device use during cardiopulmonary resuscitation with post-cardiac arrest Acute Kidney Injury

PURPOSE

To assess whether use of Impedance Threshold Device (ITD) during cardiopulmonary resuscitation (CPR) reduces the degree of post-cardiac arrest Acute Kidney Injury (AKI), as a result of improved hemodynamics, in a porcine model of ventricular fibrillation (VF) cardiac arrest.

METHODS

After 8 min of untreated cardiac arrest, the animals were resuscitated either with active compression-decompression (ACD) CPR plus a sham ITD (control group, n=8) or with ACD-CPR plus an active ITD (ITD group, n=8). Adrenaline was administered every 4 min and electrical defibrillation was attempted every 2 min until return of spontaneous circulation (ROSC) or asystole. After ROSC the animals were monitored for 6 h under general anesthesia and then returned to their cages for a 48 h observation, before euthanasia. Two novel biomarkers, Neutrophil Gelatinase-Associated Lipocalin (NGAL) in plasma and Interleukin-18 (IL-18) in urine, were measured at 2 h, 4 h, 6 h, 24 h and 48 h post-ROSC, in order to assess the degree of AKI.

RESULTS

ROSC was observed in 7 (87.5%) animals treated with the sham valve and 8 (100%) animals treated with the active valve (P=NS). However, more than twice as many animals survived at 48 h in the ITD group (n=8, 100%) compared to the control group (n=3, 37.5%). Urine IL-18 and plasma NGAL levels were augmented post-ROSC in both groups, but they were significantly higher in the control group compared with the ITD group, at all measured time points.

CONCLUSION

Use of ITD during ACD-CPR improved hemodynamic parameters, increased 48 h survival and decreased the degree of post-cardiac arrest AKI in the resuscitated animals.

Nifekalant Versus Amiodarone in the Treatment of Cardiac Arrest: an Experimental Study in a Swine Model of Prolonged Ventricular Fibrillation

PURPOSE

The purpose of the experiment was to compare the effects of nifekalant and amiodarone on the return of spontaneous circulation (ROSC), survival, as well as on the hemodynamic parameters in a swine model of prolonged ventricular fibrillation (VF).

METHODS

After 8 min of untreated VF, bolus doses of epinephrine (adrenaline) and either nifekalant, or amiodarone, or saline (n = 10 per group), were administered after randomization. Cardiopulmonary resuscitation (CPR) was commenced immediately after drug administration and defibrillation was attempted 2 min later. CPR was resumed for another 2 min after each defibrillation attempt and the same dose of adrenaline was given every 4th minute during CPR.

RESULTS

Forty-eight hour survival was significantly higher with nifekalant compared to amiodarone (p < 0.001) and saline (p = 0.02), (9/10 vs. 0/10 vs. 3/10, respectively). Systolic aortic pressure, diastolic aortic pressure and coronary perfusion pressure were significantly higher with nifekalant during CPR and immediate post-resuscitation period (p < 0.05). The animals in the amiodarone group had a slower heart rate at the 1st and 45th min post-ROSC (p < 0.001 and p = 0.006, respectively). The number of electric shocks required for terminating VF, time to ROSC and adrenaline dose were significantly higher with amiodarone compared to nifekalant (p < 0.001).

CONCLUSIONS

Nifekalant showed a more favorable hemodynamic profile and improved survival compared to amiodarone and saline in this swine model.

Amiodarone and cardiac arrest: Systematic review and meta-analysis

INTRODUCTION

The 2015 Guidelines for Resuscitation recommend amiodarone as the antiarrhythmic drug of choice in the treatment of resistant ventricular fibrillation or pulseless ventricular tachycardia. We reviewed the effects of amiodarone on survival and neurological outcome after cardiac arrest.

METHODS

We systematically searched MEDLINE and Cochrane Library from 1940 to March 2016 without language restrictions. Randomized control trials (RCTs) and observational studies were selected.

RESULTS

Our search initially identified 1663 studies, 1458 from MEDLINE and 205 from Cochrane Library. Of them, 4 randomized controlled studies and 6 observational studies met the inclusion criteria and were selected for further review. Three randomized studies were included in the meta-analysis. Amiodarone significantly improves survival to hospital admission (OR=1.402, 95% CI: 1.068-1.840, Z=2.43, P=0.015), but neither survival to hospital discharge (RR=0.850, 95% CI: 0.631-1.144, Z=1.07, P=0.284) nor neurological outcome compared to placebo or nifekalant (OR=1.114, 95% CI: 0.923-1.345, Z=1.12, P=0.475).

CONCLUSIONS

Amiodarone significantly improves survival to hospital admission. However there is no benefit of amiodarone in survival to discharge or neurological outcomes compared to placebo or other antiarrhythmics.

Comparative analysis of two venipuncture learning methods on nursing students

INTRODUCTION

Venus cannulation is one of the main nursing actions. For the safety of patients and nurses, this skill is important to be performed in a proper and responsible way. Thus, the need for adequate education on this skill is essential.

STUDY OBJECTIVE

Comparison between the 4-stage (demonstration, deconstruction, comprehension, performance) learning method and the simplified 2-stage method (deconstruction, performance) on venous cannulation.

METHODS

The study took place from November 2011 to March 2012. In total, 117 students of the Nursing Department of Technological Educational Institute of Athens were randomized into two education groups of the 2- (Group A) and 4- (Group B) stage method respectively. Students of both groups were assessed during training and 45days later for skill retention. For the assessment of all students, a check list with the steps required to venous cannulation was used. The time to complete the process was also assessed.

RESULTS

Group A included 54 students and Group B 50 students. During initial training, the average time to complete the process without any errors was lower for Group A compared to Group B (1.77±0.12min vs. 2.33±0.13min, p=0.006). Regarding the appropriate steps for venous cannulation, Group A made fewer errors compared to Group B (0.95±0.95 vs. 1.38±1.10, p=0.021). In addition, Group A omitted more steps than Group B (0.29±0.06 vs. 0.11±0.05, p=0.042). During skill retention assessment, no significant difference was observed in the number of incorrect steps or in the number of omitted steps between groups.

CONCLUSION

According to our findings, the 4-stage method, is associated with less omitted steps, while the 2-stage method, is associated with less time required to complete the procedure and less errors during performance, at initial stages. However, skill retention does not seem to be associated with the type of the educational methodology.

Pneumonia presenting with lower right abdominal pain and migratory polyarthritis

The clinical presentation of community acquired pneumonia (CAP) in adults includes mainly symptoms from the respiratory system, whereas CAP is considered as a main cause of abdominal pain in pediatric patients.

We present the case of a patient, who was admitted to our hospital due to abdominal pain that deteriorated progressively and radiated to the lumbar region. The clinical examination revealed decreased breath sounds at the right lung base after 72 h, while the chest X-ray showed pneumonia of the right lung base. The blood culture isolated Streptococcus pneumoniae, and the patient received penicillin according to the results of the antibiogram. In addition, the patient developed symptoms of migratory arthritis, which resolved after 48 h.

CAP should be included in the differential diagnosis of abdominal pain in adult patients. Furthermore, the hematogenous spread of S. pneumoniae may be associated with the development of migratory arthritis.

Psychosocial factors and susceptibility to or outcome of acute respiratory tract infections

OBJECTIVE

To perform a systematic review of the literature to assess the possible effect that psychosocial variables may have on the susceptibility and/or outcome of acute respiratory tract infections (ARTIs).

METHODS

We performed searches for relevant studies on PubMed, Scopus and PsychInfo.

RESULTS

We identified 44 studies published between 1986 and 2008, examining the role of psychosocial variables and the onset or progression of ARTI. Of these 44 studies, 41 (93.1%) showed at least one statistically significant association between psychosocial variables and susceptibility to ARTI; 20 (45.5%) revealed at least one statistically significant association between psychosocial variables and outcome of ARTI. Variables associated with susceptibility to and outcome of infection were higher levels of perceived stress, negative affect, anxiety and depression. Negative life events were associated with susceptibility to infection.

CONCLUSION

Most of the relevant studies show a significant relationship between psychosocial factors and the onset or progression of acute respiratory tract illness. However, the psychosocial variables were not consistently evaluated across the included studies, and different methodological approaches were used to examine the association between psychosocial factors and acute respiratory tract illness.