Noninvasive Surrogate for Physiologic Dead Space Using the Carbon Dioxide Ventilatory Equivalent: Testing in a Single-Center Cohort, 2017-2023.

OBJECTIVES: We sought to evaluate the association between the carbon dioxide (co2) ventilatory equivalent (VEqco2 = minute ventilation/volume of co2 produced per min), a marker of dead space that does not require a blood gas measurement, and mortality risk. We compared the strength of this association to that of physiologic dead space fraction (VD/Vt = [Paco2-mixed-expired Pco2]/Paco2) as well as to other commonly used markers of dead space (i.e., the end-tidal alveolar dead space fraction [AVDSf = (Paco2-end-tidal Pco2)/Paco2], and ventilatory ratio [VR = (minute ventilation × Paco2)/(age-adjusted predicted minute ventilation × 37.5)]). DESIGN: Retrospective cohort data, 2017-2023. SETTING: Quaternary PICU. PATIENTS: One hundred thirty-one children with acute respiratory distress syndrome. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: All dead space markers were calculated at the same 1-minute timepoint for each patient within the first 72 hours of using invasive mechanical ventilation. The 131 children had a median (interquartile range, IQR) age of 5.8 (IQR 1.4, 12.6) years, oxygenation index (OI) of 7.5 (IQR 4.6, 14.3), VD/Vt of 0.47 (IQR 0.38, 0.61), and mortality was 17.6% (23/131). Higher VEqco2 (p = 0.003), VD/Vt (p = 0.002), and VR (p = 0.013) were all associated with greater odds of mortality in multivariable models adjusting for OI, immunosuppressive comorbidity, and overall severity of illness. We failed to identify an association between AVDSf and mortality in the multivariable modeling. Similarly, we also failed to identify an association between OI and mortality after controlling for any dead space marker in the modeling. For the 28-day ventilator-free days outcome, we failed to identify an association between VD/Vt and the dead space markers in multivariable modeling, although OI was significant. CONCLUSIONS: VEqco2 performs similarly to VD/Vt and other surrogate dead space markers, is independently associated with mortality risk, and may be a reasonable noninvasive surrogate for VD/Vt.

Prehospitalization Trauma and Physiologic Factors Associated with the Presence of Post-traumatic Stress 3 Months After PICU Discharge.

BACKGROUND: Children admitted to the pediatric intensive care unit (PICU) have post-traumatic stress (PTS) rates up to 64%, and up to 28% of them meet criteria for PTS disorder (PTSD). We aim to examine whether a prior trauma history and increased physiologic parameters due to a heightened sympathetic response are associated with later PTS. Our hypothesis was children with history of prehospitalization trauma, higher heart rates, blood pressures, cortisol, and extrinsic catecholamine administration during PICU admission are more likely to have PTS after discharge. METHODS: This is a prospective, observational study of children admitted to the PICU at an urban, quaternary, academic children's hospital. Children aged 8 to 17 years old without developmental delay, severe psychiatric disorder, or traumatic brain injury were included. Children's prehospitalization trauma history was assessed with a semistructured interview. All in-hospital variables were from the electronic medical record. PTS was present if children had 4 of the Diagnostic and Statistical Manual of Mental Disorders IV criteria for PTSD. Student's t- and chi-squared tests were used to compare the presence or absence of prior trauma and all of the PICU-associated variables. RESULTS: Of the 110 children at baseline, 67 had 3-month follow-up. In the latter group, 46% met the criteria for PTS, mean age of 13 years (SD 3), 57% male, a mean PRISM III score of 4.9 (SD 4.3), and intensive care unit length of stay 6.5 days (SD 7.8). There were no statistically significant differences in the demographics of the children with and without PTS. The only variable to show significance was trauma history; children with prehospitalization trauma were more likely to have PTS at 3-month follow-up (P = .02). CONCLUSIONS: Prehospitalization trauma history was associated with the presence of PTS after admission to the PICU. This study suggests future studies should shift to the potential predictive benefit of screening children for trauma history upon PICU admission.

Admission Psychosocial Characteristics of Critically Ill Children and Acute Stress.

OBJECTIVES: Children are at increased risk for developing acute stress and post-traumatic stress following admission to the PICU. The primary objective of this investigation was to explore the prehospitalization psychosocial characteristics of children admitted to the PICU and their association with acute stress. DESIGN: Observational. SETTING: The PICU at an urban, academic, pediatric medical center. PATIENTS: Children, 8-17 years old with an expected PICU stay greater than 24 hours were recruited. MEASUREMENTS AND MAIN RESULTS: During the admission, they completed questionnaires and a semistructured interview evaluating prehospitalization psychosocial symptoms, including prehospitalization post-traumatic stress, quality of life, and current acute stress. One hundred eleven children were enrolled (mean age = 12.9 yr; 60% male; 58% Latino). Half (51%) reported a prehospitalization history of trauma and nearly all (96%) of these children had post-traumatic stress. They had significant impairment on all domains of quality of life. Children reported high rates of acute stress during their hospitalization, 74.8% acute stress symptoms, and 6% met diagnostic criteria for acute stress disorder. Univariate analysis showed associations between child age, quality of life, chronic illness, and post-traumatic stress with more severe acute stress. Multiple linear regression modeling of acute stress was done accounting for child age, acute versus chronic illness, quality of life, and post-traumatic stress; prehospitalization quality of life and post-traumatic stress remained significantly associated with the development of inhospital acute stress and accounted for 34% of the variance of the model. CONCLUSIONS: The current investigation is a novel evaluation of the prehospitalization psychosocial characteristics of children admitted to a PICU. The children enrolled reported high rates of acute stress, which was associated with a history of post-traumatic stress and worsened quality of life. The relation with post-traumatic stress is consistent with prior research into complex post-traumatic stress disorder and increases concerns about long-term psychosocial outcomes. Our data advance understanding of the factors contributing to acute stress during hospitalizations and may add to recognizing the importance of models integrating psychosocial support.

Vaping Cannabis Butane Hash Oil Leads to Severe Acute Respiratory Distress Syndrome-A Case of EVALI in a Teenager With Hypertrophic Cardiomyopathy.

A 17-year-old with severe hypertrophic cardiomyopathy (HCM) presented to the emergency department with symptoms of cough, shortness of breath, chest pain, and tactile fevers. She was initially admitted to the cardiac floor, and later transferred to the cardiothoracic intensive care unit on day 5 of illness with deterioration over the next week from BiLevel positive airway pressure to endotracheal intubation. The patient met criteria for severe acute respiratory distress syndrome (ARDS). Standard ARDS lung-protective strategies were refined in consideration of complications caused by her HCM. Such complications included dynamic cardiac outflow obstruction, myocardial ischemia with tachycardia, elevated pulmonary vascular resistance from diastolic dysfunction, and narrow fluid balance window to reduce pulmonary edema while maintaining adequate left ventricular preload. The patient remained refractory despite broad-spectrum antibiotics requiring multiple vasoactive medications, aggressive ventilator management, and inhaled nitric oxide. Social history revealed "vaping" cannabis with butane hash oil prior to symptom onset. Corticosteroids were initiated 2 weeks after initial presentation (day 9 of mechanical ventilation) with rapid recovery and resolution of illness. Acute respiratory distress syndrome is an aggressive disease in the intensive care unit. E-cigarette or vaping product use-associated lung injury is increasingly recognized as a cause of ARDS in adolescents and adults. A complete social history is essential and must be obtained early in all such patients presenting with symptoms of acute respiratory distress and revisited throughout the hospital stay if no other reason for the ARDS is discovered. Disease progression may be subacute with a long interval between onset of symptoms and peak symptoms. The risk of barotrauma is high despite lung-protective ventilation strategies. Management is supportive with resolution over days to weeks. However, other clinical factors may considerably complicate management in cases of underlying comorbidities.

The Effects of Family Functioning on the Development of Posttraumatic Stress in Children and Their Parents Following Admission to the PICU.

OBJECTIVES: To report the rate of acute stress and posttraumatic stress among children and parents following PICU admission and the relation between family function and posttraumatic stress. DESIGN: Prospective, longitudinal, multi-informant observational study. Pediatric patients (n = 69) and parents were recruited in the ICU. They completed measures evaluating acute stress and posttraumatic stress during their hospitalization and at 3-month follow-up. Parents completed measures of family functioning during the hospitalization. Pearson correlations and multiple regression models were used to examine the relations between family functioning and acute stress and posttraumatic stress. SETTING: An academic, urban, pediatric hospital in California. PATIENTS: Children, 8-17 years old, admitted to the PICU for greater than 24 hours and their English- or Spanish-speaking parents. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: All children endorsed acute stress during their PICU admission, with 51% meeting criteria for acute stress disorder. At 3-month follow-up, 53% of the children continued to endorse posttraumatic stress with 13% meeting criteria for posttraumatic stress disorder. Among parents, 78% endorsed acute stress during admission with 30% meeting criteria for acute stress disorder, and at follow-up, 35% endorsed posttraumatic stress with 10% meeting criteria for posttraumatic stress disorder. In multiple linear regression modeling, child acute stress significantly predicted child posttraumatic stress (ß = 0.36; p < 0.01). In the parent model, parent acute stress (ß = 0.29; p < 0.01) and parent education (ß = 0.59; p < 0.00) positively predicted parent's posttraumatic stress. Family function was not a predictor of either's posttraumatic stress. CONCLUSIONS: Both children and parents have alarmingly high rates of acute stress and posttraumatic stress following the child's PICU admission. Although family function did not emerge as a predictor in this study, further understanding of the influence of the family and the interplay between child and parent posttraumatic stress is needed to improve our understanding of the model of development of posttraumatic stress in this population to inform the intervention strategies.

Implementation of a Risk-Stratified Opioid and Benzodiazepine Weaning Protocol in a Pediatric Cardiac ICU.

OBJECTIVES: Opioids and benzodiazepines are commonly used to provide analgesia and sedation for critically ill children with cardiac disease. These medications have been associated with adverse effects including delirium, dependence, withdrawal, bowel dysfunction, and potential neurodevelopmental abnormalities. Our objective was to implement a risk-stratified opioid and benzodiazepine weaning protocol to reduce the exposure to opioids and benzodiazepines in pediatric patients with cardiac disease. DESIGN: A prospective pre- and postinterventional study. PATIENTS: Critically ill patients less than or equal to 21 years old with acquired or congenital cardiac disease exposed to greater than or equal to 7 days of scheduled opioids ± scheduled benzodiazepines between January 2013 and February 2015. SETTING: A 24-bed pediatric cardiac ICU and 21-bed cardiovascular acute ward of an urban stand-alone children's hospital. INTERVENTION: We implemented an evidence-based opioid and benzodiazepine weaning protocol using educational and quality improvement methodology. MEASUREMENTS AND MAIN RESULTS: One-hundred nineteen critically ill children met the inclusion criteria (64 post intervention, 55 pre intervention). Demographics and risk factors did not differ between groups. Patients in the postintervention period had shorter duration of opioids (19.0 vs 30.0 d; p < 0.01) and duration of benzodiazepines (5.3 vs 22.7 d; p < 0.01). Despite the shorter duration of wean, there was a decrease in withdrawal occurrence (% Withdrawal Assessment Tool score ≥ 4, 4.9% vs 14.1%; p < 0.01). There was an 8-day reduction in hospital length of stay (34 vs 42 d; p < 0.01). There was a decrease in clonidine use (14% vs 32%; p = 0.02) and no change in dexmedetomidine exposure (59% vs 75%; p = 0.08) in the postintervention period. CONCLUSIONS: We implemented a risk-stratified opioid and benzodiazepine weaning protocol for critically ill cardiac children that resulted in reduction in opioid and benzodiazepine duration and dose exposure, a decrease in symptoms of withdrawal, and a reduction in hospital length of stay.

Implementation of a risk-stratified opioid weaning protocol in a pediatric intensive care unit.

PURPOSE: Opioids are important in the care of critically ill children. However, their use is associated with complications including delirium, dependence, withdrawal, and bowel dysfunction. Our aim was to implement a risk-stratified opioid weaning protocol to reduce the duration of opioids without increasing the incidence of withdrawal. METHODS: A pre- and post-interventional prospective study was undertaken in a large children's hospital pediatric ICU where we implemented a risk-stratified opioid weaning protocol. Patients were included if exposed to ≥7days of scheduled opioids. The primary outcome was duration of opioids and secondary outcome was hospital LOS. RESULTS: One hundred seven critically ill children met the inclusion criteria (68 pre-, 39 post-intervention). Demographics, risk factors, and confounders did not differ between groups. Patients in the post-intervention group had shorter duration of opioids (17 vs. 22.5days, p=0.01) and opioid wean (12 vs. 18days, p=0.01). Despite the shorter duration of opioid wean, there was no increase in withdrawal incidence. There was no difference in the LOS (29 vs. 33days, p=0.06). CONCLUSIONS: We implemented a risk-stratified opioid weaning protocol for critically ill children that resulted in reduction in opioid exposure without an increase in withdrawal. There was no difference in the LOS.

The Role of Extracorporeal Membrane Oxygenation Simulation Training at Extracorporeal Life Support Organization Centers in the United States.

INTRODUCTION: Extracorporeal membrane oxygenation (ECMO) requires a multidisciplinary healthcare team. The Extracorporeal Life Support Organization publishes training guidelines but leaves specific requirements up to each institution. Simulation training has shown promise, but it is unclear how many institutions have incorporated simulation techniques into ECMO training to date. METHODS: We sent an electronic survey to ECMO coordinators at Extracorporeal Life Support Organization sites in the United States. Participants were asked about training practices and the use of simulation for ECMO training. Descriptive results were reported as the percentage of total responses for each question. Logistic regression was used to identify characteristics associated with simulation use. RESULTS: Of 94 responses (62% response rate), 46% had an ECMO simulation program, whereas 26% report a program is in development. Most (61%) have been in operation for 2 to 5 years. Sixty-three percent use simulation for summative assessment, and 76% have multidisciplinary training. Access to a simulation center [odds ratio (OR) = 4.7, 95% confidence interval (CI) = 1.7-12.5], annual ECMO caseload of greater than 20 (OR = 2.5, 95% CI = 1.5-5.8), and having a pediatric cardiothoracic intensive care unit (OR = 2.8, 95% CI = 1.2-6.7) are each associated with increased likelihood of mannequin-based ECMO simulation. Common scenarios include pump failure (93%), oxygenator failure (90%), and circuit rupture (76%). DISCUSSION: Extracorporeal membrane oxygenation simulation is growing but remains in its infancy. Centers with access to a simulation center, higher caseloads, and pediatric cardiothoracic intensive care units are more likely to have ECMO simulation programs. Extracorporeal membrane oxygenation simulation is felt to be beneficial, and further work is needed to delineate best training practices for ECMO providers.

Posttraumatic stress disorder in children and their parents following admission to the pediatric intensive care unit: a review.

OBJECTIVE: To evaluate posttraumatic stress disorder in children who have been admitted to the pediatric intensive care unit and their families. DATA SOURCES: Studies were identified through PubMed, MEDLINE, and Ovid. STUDY SELECTION: All descriptive, observational, and controlled studies with a focus on posttraumatic stress disorder and the pediatric intensive care unit were included. DATA EXTRACTION AND DATA SYNTHESIS: Posttraumatic stress disorder rates in children following admission to the pediatric intensive care unit were between 5% and 28%, while rates of posttraumatic stress disorder symptoms were significantly higher, 35% to 62%. There have been inconsistencies noted across risk factors. Objective and subjective measurements of disease severity were intermittently positively associated with development of posttraumatic stress disorder. There was a positive relationship identified between the child's symptoms of posttraumatic stress disorder and their parents' symptoms.The biological mechanisms associated with the development of posttraumatic stress disorder in children admitted to the pediatric intensive care unit have yet to be explored. Studies in children following burn or other unintentional injury demonstrate potential relationships between adrenergic hormone levels and a diagnosis of posttraumatic stress disorder. Likewise genetic studies suggest the importance of the adrenergic system in this pathway.The rates of posttraumatic stress disorder in parents following their child's admission to the pediatric intensive care unit ranged between 10.5% and 21%, with symptom rates approaching 84%. It has been suggested that mothers are at increased risk for the development of posttraumatic stress disorder compared to fathers. Objective and subjective measures of disease severity yielded mixed findings with regard to the development of posttraumatic stress disorder. Protective parental factors may include education or the opportunity to discuss the parents' feelings during the admission. CONCLUSIONS: Following admission to the pediatric intensive care unit, both children and their parents have high rates of trauma exposure, both personally and secondary exposure via other children and their families, and subsequently are reporting significant rates of posttraumatic stress disorder. To effectively treat our patients, we must recognize the signs of posttraumatic stress disorder and strive to mitigate the negative effects.

Maternal phobic anxiety and child anxiety.

The present study examined the relation between maternal anxiety symptoms and child anxiety symptoms and evaluated whether a reporting bias is associated with maternal anxiety. Fifty-seven mother-child pairs participated. All children had features or diagnoses of separation anxiety disorder (SAD), generalized anxiety disorder, and/or social phobia. Measures of maternal symptomatology and child anxiety were administered. Higher levels of maternal phobic anxiety on the Brief Symptom Inventory were significantly associated with higher levels of separation anxiety in children. After controlling for clinician rating of SAD severity, maternal phobic anxiety emerged as a significant predictor of maternal ratings of child separation anxiety, accounting for 19% of the variance. Phobic mothers endorsed levels of separation anxiety in their children that exceeded levels endorsed by clinicians, suggesting maternal overreporting.