Predictors of Increased Lactate in Neonatal Cardiac Surgery: The Impact of Cardiopulmonary Bypass.

OBJECTIVE: Hyperlactatemia develops intraoperatively during cardiac surgery and is associated with postoperative mortality. This study aimed to determine the factors that lead to an increase in lactate during cardiopulmonary bypass (CPB) in neonates undergoing cardiac surgery. DESIGN: Retrospective study from July 2015 to December 2018. SETTING: Academic tertiary children's hospital. PARTICIPANTS: The study comprised 376 neonates. INTERVENTIONS: No interventions were performed. MEASUREMENTS AND MAIN RESULTS: Lactate measurements at prebypass, upon initiation of CPB and before coming off CPB, last in the operating room, and first in the cardiac intensive care unit were collected. The changes in lactate levels were compared using the nonparametric Wilcoxon signed rank test for paired data. Univariate and multivariate median regression models of the change during CPB were determined. The cohort characteristics were male (60%), median age 5 days (range 1-30), and weight 3.2 kg (range 1.5-4.7). Most patients had a STAT score of 4 (45%) or 5 (23%). Significant increases in lactate were observed from pre-CPB to start of CPB (p < 0.001) and from start to end of CPB (p < 0.001). In the multivariate regression analysis, duration of circulatory arrest (coefficient = 1.216; 95% confidence interval [CI] 0.754-1.678; p < 0.001), duration of mean arterial pressure < 25 mmHg (coefficient = 0.423; 95% CI 0.196-to- 0.651; p < 0.001), and duration of mean arterial pressure between 35 and 39 mmHg (coefficient = -0.246; 95% CI -0.397 to -0.095; p = 0.001) were identified as significant independent predictors of the lactate change per 30- minutes duration. CONCLUSION: These results emphasized the importance of blood pressure management during CPB and the importance of the duration of circulatory arrest.

Hyperlactataemia as a predictor of adverse outcomes post-cardiac surgery in neonates with congenital heart disease.

OBJECTIVE: To evaluate the discriminative ability of hyperlactataemia for early morbidity and mortality in neonates with CHD following cardiac surgery. METHODS: Retrospective, observational study of neonates who underwent cardiac surgery on cardiopulmonary bypass at a tertiary care children's hospital from June 2015 to June 2019. The primary predictor was lactate. The primary composite outcome was defined as ≥1 of the following: cardiac arrest or extracorporeal membrane oxygenation within 72 hours or 30-day mortality post-operatively. The secondary outcome was the presence of major residual lesions, according to the Technical Performance Score. RESULTS: Of 432 neonates, 28 (6.5%) sustained the composite outcome. On univariate analysis, peak lactate within 48 hours, increase in lactate from ICU admission through 12 hours, and single ventricle physiology were significantly associated with the composite outcome. The peak lactate occurred at a median of 2.9 hours (interquartile range: 1, 35) before the event. Through multi-variable analysis, a multi-variable risk algorithm was created. Predicted probabilities demonstrated an increasing risk based on single ventricle status and delta lactate, ranging from 1.8% (95% CI: 0.9, 3.9) to 52.4% (95% CI: 32.4, 71.7). The model had good discriminative ability for the composite outcome on receiver operating characteristic analysis (area under the curve = 0.79; 95% CI: 0.75, 0.89). Moreover, a peak lactate of 7.3 mmol/l or greater was significantly associated with the presence of a major residual lesion (odds ratios: 5.16, 95% CI: 3.01, 8.87). CONCLUSIONS: We present a simple, two-variable model, including delta lactate in the immediate post-operative period and single ventricle status, to prognosticate the risk of early morbidity and mortality in neonates undergoing cardiac surgery for potential intervention.

Useful References in Pediatric Cardiac Intensive Care: The 2017 Update.

OBJECTIVES: Pediatric cardiac intensive care continues to evolve, with rapid advances in knowledge and improvement in clinical outcomes. In the past, the Board of Directors of the Pediatric Cardiac Intensive Care Society created and subsequently updated a list of sentinel references focused on the care of critically ill children with congenital and acquired heart disease. The objective of this article is to provide clinicians with a compilation and brief summary of updated and useful references that have been published since 2012. DATA SELECTION: Pediatric Cardiac Intensive Care Society members were solicited via a survey sent out between March 20, 2017, and April 28, 2017, to provide important references that have impacted clinical care. The survey was sent to approximately 523 members. Responses were received from 45 members, of which some included multiple references. DATA EXTRACTION: Following review of the list of references, and removing editorials, references were compiled by the first and last author. The final list was submitted to members of the society's Research Briefs Committee, who ranked each publication. DATA SYNTHESIS: Rankings were compiled and the references with the highest scores included. Research Briefs Committee members ranked the articles from 1 to 3, with one being highly relevant and should be included and 3 being less important and should be excluded. Averages were computed, and the top articles included in this article. The first (K.C.U.) and last author (K.M.G.) reviewed and developed summaries of each article. CONCLUSIONS: This article contains a compilation of useful references for the critical care of children with congenital and acquired heart disease published in the last 5 years. In conjunction with the prior version of this update in 2012, this article may be used as an educational reference in pediatric cardiac intensive care.

Obesity and elevated blood pressure following repair of coarctation of the aorta.

OBJECTIVE: To determine whether patients with coarctation of the aorta (COA) were more likely to develop obesity compared with the general population or others with isolated forms of congenital heart disease. STUDY DESIGN: We conducted a cross-sectional study of 160 patients who underwent COA repair at our institution between 1974 and 2009. Body mass index (BMI) measurements were obtained from the most recent clinic visit and at 5, 10, 15, and 20 years of age from retrospective chart review. BMI values were compared against established normal data to obtain age-sex matched z-scores. We also compared the rates of developing obesity over time in adults with COA vs 96 adults with other isolated forms of congenital heart disease, including aortic valve stenosis, pulmonary valve stenosis, or atrial septal defect. RESULTS: After age 5 years, patients with COA had significantly greater BMI z-scores compared with age-sex matched normal data (P < .001). The proportion of obesity in patients with COA significantly increased over time (P < .001). Adults with repaired COA developed obesity at a greater rate than those with either aortic valve stenosis (P = .004) or with pulmonary valve stenosis or atrial septal defect (P < .001). CONCLUSIONS: There is a greater incidence of obesity that progressively increases with age in patients with repaired COA. Adults with repaired COA developed obesity at a greater rate than those with other isolated forms of congenital heart disease. Further prospective trials are needed to confirm our observations and to elucidate the potential mechanism relating COA to obesity.

Caring for hearts and minds: a quality improvement approach to individualized developmental care in the cardiac intensive care unit.

Introduction: Infants with congenital heart disease (CHD) are at high risk for developmental differences which can be explained by the cumulative effect of medical complications along with sequelae related to the hospital and environmental challenges. The intervention of individualized developmental care (IDC) minimizes the mismatch between the fragile newborn brain's expectations and the experiences of stress and pain inherent in the intensive care unit (ICU) environment. Methods: A multidisciplinary group of experts was assembled to implement quality improvement (QI) to increase the amount of IDC provided, using the Newborn Individualized Developmental Care and Assessment Program (NIDCAP), to newborn infants in the cardiac ICU. A Key Driver Diagram was created, PDSA cycles were implemented, baseline and ongoing measurements of IDC were collected, and interventions were provided. Results: We collected 357 NIDCAP audits of bedside IDC. Improvement over time was noted in the amount of IDC including use of appropriate lighting, sound management, and developmentally supportive infant bedding and clothing, as well as in promoting self-regulation, therapeutic positioning, and caregiving facilitation. The area of family participation and holding of infants in the CICU was the hardest to support change over time, especially with the most ill infants. Infants with increased medical complexity were less likely to receive IDC. Discussion: This multidisciplinary, evidence-based QI intervention demonstrated that the implementation of IDC in the NIDCAP model improved over time using bedside auditing of IDC.

Management of Ebstein Anomaly in the Current Era: The Story of One Fetus and the Collaboration of Many-A Case Report.

Collaborative multicenter research has significantly increased our understanding of fetal Ebstein anomaly, delineating risk factors for adverse outcomes as well as predictors of postnatal management. These data are incorporated into prenatal care and therapeutic strategies and inform family counseling and delivery planning to optimize care. This report details the translation of findings from multicenter studies into multidisciplinary prenatal care for a fetus with Ebstein anomaly, supraventricular tachycardia, and a circular shunt, including transplacental therapy to control arrhythmias and achieve ductal constriction, informed and coordinated delivery room management, and planned univentricular surgical palliation.

Epidemiology of Postoperative Junctional Ectopic Tachycardia in Infants Undergoing Cardiac Surgery.

BACKGROUND: Junctional ectopic tachycardia (JET) complicates congenital heart surgery in 2% to 8.3% of cases. JET is associated with postoperative morbidity in single-center studies. We used the Pediatric Cardiac Critical Care Consortium data registry to provide a multicenter epidemiologic description of treated JET. METHODS: This is a retrospective study (February 2019-August 2022) of patients with treated JET. Inclusion criteria were (1) <12 months old at the index operation, and (2) treated for JET <72 hours after surgery. Diagnosis was defined by receiving treatment (pacing, cooling, and medications). A multilevel logistic regression analysis with hospital random effect identified JET risk factors. Impact of JET on outcomes was estimated by margins/attributable risk analysis using previous risk-adjustment models. RESULTS: Among 24,073 patients from 63 centers, 1436 (6.0%) were treated for JET with significant center variability (0% to 17.9%). Median time to onset was 3.4 hours, with 34% present on admission. Median duration was 2 days (interquartile range, 1-4 days). Tetralogy of Fallot, atrioventricular canal, and ventricular septal defect repair represented >50% of JET. Patient characteristics independently associated with JET included neonatal age, Asian race, cardiopulmonary bypass time, open sternum, and early postoperative inotropic agents. JET was associated with increased risk-adjusted durations of mechanical ventilation (incidence rate ratio, 1.6; 95% CI, 1.5-1.7) and intensive care unit length of stay (incidence rate ratio, 1.3; 95% CI, 1.2-1.3), but not mortality. CONCLUSIONS: JET is treated in 6% of patients with substantial center variability. JET contributes to increased use of postoperative resources. High center variability warrants further study to identify potential modifiable factors that could serve as targets for improvement efforts to ameliorate deleterious outcomes.

Norwood Operation: Immediate vs Delayed Sternal Closure.

BACKGROUND: The Norwood operation is a complex neonatal surgery. There are limited data to inform the timing of sternal closure. After the Norwood operation, delayed sternal closure (DSC) is frequent. We aimed to examine the association of DSC with outcomes, with a particular interest in how sternal closure at the time of surgery compared with the timing of DSC. Our outcomes included mortality, length of ventilation, length of stay, and postoperative complications. METHODS: This retrospective study included neonates who underwent a Norwood operation reported in the Pediatric Cardiac Critical Care Consortium registry from February 2019 through April 2021. Outcomes of patients with closed sternum were compared to those with sternal closure prior to postoperative day 3 (early closure) and prior to postoperative day 6 (intermediate closure). RESULTS: The incidence of DSC was 74% (500 of 674). The median duration of open sternum was 4 days (interquartile range 3-5 days). Comparing patients with closed sternum to patients with early sternal closure, there was no statistical difference in mortality rate (1.1% vs 0%) and the median hospital postoperative stay (30 days vs 31 days). Compared with closed sternum, patients with intermediate sternal closure required longer mechanical ventilation (5.9 days vs 3.9 days) and fewer subsequent sternotomies (3% vs 7.5%). CONCLUSIONS: For important outcomes following the Norwood operation there is no advantage to chest closure at the time of surgery if the chest can be closed prior to postoperative day 3.

Assessment of an Instrument to Measure Interdisciplinary Staff Perceptions of Quality of Dying and Death in a Pediatric Cardiac Intensive Care Unit.

Importance: Lack of pediatric end-of-life care quality indicators and challenges ascertaining family perspectives make staff perceptions valuable. Cardiac intensive care unit (CICU) interdisciplinary staff play an integral role supporting children and families at end of life. Objectives: To evaluate the Pediatric Intensive Care Unit Quality of Dying and Death (PICU-QODD) instrument and examine differences between disciplines and end-of-life circumstances. Design, Setting, and Participants: This cross-sectional survey included staff at a single center involved in pediatric CICU deaths from July 1, 2019, to June 30, 2021. Exposures: Staff demographic characteristics, intensity of end-of-life care (mechanical support, open chest, or cardiopulmonary resuscitation [CPR]), mode of death (discontinuation of life-sustaining therapy, treatment limitation, comfort care, CPR, and brain death), and palliative care involvement. Main Outcomes and Measures: PICU-QODD instrument standardized score (maximum, 100, with higher scores indicating higher quality); global rating of quality of the moment of death and 7 days prior (Likert 11-point scale, with 0 indicating terrible and 10, ideal) and mode-of-death alignment with family wishes. Results: Of 60 patient deaths (31 [52%] female; median [IQR] age, 4.9 months [10 days to 7.5 years]), 33 (55%) received intense care. Of 713 surveys (72% response rate), 246 (35%) were from nurses, 208 (29%) from medical practitioners, and 259 (36%) from allied health professionals. Clinical experience varied (298 [42%] ≤5 years). Median (IQR) PICU-QODD score was 93 (84-97); and quality of the moment of death and 7 days prior scores were 9 (7-10) and 5 (2-7), respectively. Cronbach α ranged from 0.87 (medical staff) to 0.92 (allied health), and PICU-QODD scores significantly correlated with global rating and alignment questions. Mean (SD) PICU-QODD scores were more than 3 points lower for nursing and allied health compared with medical practitioners (nursing staff: 88.3 [10.6]; allied health: 88.9 [9.6]; medical practitioner: 91.9 [7.8]; P < .001) and for less experienced staff (eg, <2 y: 87.7 [8.9]; >15 y: 91, P = .002). Mean PICU-QODD scores were lower for patients with comorbidities, surgical admissions, death following treatment limitation, or death misaligned with family wishes. No difference was observed with palliative care involvement. High-intensity care, compared with low-intensity care, was associated with lower median (IQR) rating of the quality of the 7 days prior to death (4 [2-6] vs 6 [4-8]; P = .001) and of the moment of death (8 [4-10] vs 9 [8-10]; P =.001). Conclusions and Relevance: In this cross-sectional survey study of CICU staff, the PICU-QODD showed promise as a reliable and valid clinician measure of quality of dying and death in the CICU. Overall QODD was positively perceived, with lower rated quality of 7 days prior to death and variation by staff and patient characteristics. Our data could guide strategies to meaningfully improve CICU staff well-being and end-of-life experiences for patients and families.

Analgesia, Sedation, and Anesthesia for Neonates With Cardiac Disease.

Analgesia, sedation, and anesthesia are a continuum. Diagnostic and/or therapeutic procedures in newborns often require analgesia, sedation, and/or anesthesia. Newborns, in general, and, particularly, those with heart disease, have an increased risk of serious adverse events, including mortality under anesthesia. In this section, we discuss the assessment and management of pain and discomfort during interventions, review the doses and side effects of commonly used medications, and provide recommendations for their use in newborns with heart disease. For procedures requiring deeper levels of sedation and anesthesia, airway and hemodynamic support might be necessary. Although associations of long-term deleterious neurocognitive effects of anesthetic agents have received considerable attention in both scientific and lay press, causality is not established. Nonetheless, an early multimodal, multidisciplinary approach is beneficial for safe management before, during, and after interventional procedures and surgery to avoid problems of tolerance and delirium, which can contribute to long-term cognitive dysfunction.

Development of Care Curves Following the Stage 1 Palliation: A Comparison of Intensive Care Among 5 Centers.

Background Comparison of care among centers is currently limited to major end points, such as mortality, length of stay, or complication rates. Creating "care curves" and comparing individual elements of care over time may highlight modifiable differences in intensive care among centers. Methods and Results We performed an observational retrospective study at 5 centers in the United States to describe key elements of postoperative care following the stage 1 palliation. A consecutive sample of 502 infants undergoing stage 1 palliation between January 2009 and December 2018 were included. All electronic health record entries relating to mandatory mechanical ventilator rate, opioid administration, and fluid intake/outputs between postoperative days (POD) 0 to 28 were extracted from each institution's data warehouse. During the study period, 502 patients underwent stage 1 palliation among the 5 centers. Patients were weaned to a median mandatory mechanical ventilator rate of 10 breaths/minute by POD 4 at Center 5 but not until POD 7 to 8 at Centers 1 and 2. Opioid administration peaked on POD 2 with extreme variance (median 6.9 versus 1.6 mg/kg per day at Center 3 versus Center 2). Daily fluid balance trends were variable: on POD 3 Center 1 had a median fluid balance of -51 mL/kg per day, ranging between -34 to 19 mL/kg per day among remaining centers. Intercenter differences persist after adjusting for patient and surgical characteristics (P<0.001 for each end point). Conclusions It is possible to detail and compare individual elements of care over time that represent modifiable differences among centers, which persist even after adjusting for patient factors. Care curves may be used to guide collaborative quality improvement initiatives.

Palliative Care Referrals in Cardiac Disease.

OBJECTIVES: With evidence of benefits of pediatric palliative care (PPC) integration, we sought to characterize subspecialty PPC referral patterns and end of life (EOL) care in pediatric advanced heart disease (AHD). METHODS: In this retrospective cohort study, we compared inpatient pediatric (<21 years) deaths due to AHD in 2 separate 3-year epochs: 2007-2009 (early) and 2015-2018 (late). Demographics, disease burden, medical interventions, mode of death, and hospital charges were evaluated for temporal changes and PPC influence. RESULTS: Of 3409 early-epoch admissions, there were 110 deaths; the late epoch had 99 deaths in 4032 admissions. In the early epoch, 45 patients (1.3% admissions, 17% deaths) were referred for PPC, compared with 146 late-epoch patients (3.6% admissions, 58% deaths). Most deaths (186 [89%]) occurred in the cardiac ICU after discontinuation of life-sustaining therapy (138 [66%]). Medical therapies included ventilation (189 [90%]), inotropes (184 [88%]), cardiopulmonary resuscitation (68 [33%]), or mechanical circulatory support (67 [32%]), with no temporal difference observed. PPC involvement was associated with decreased mechanical circulatory support, ventilation, inotropes, or cardiopulmonary resuscitation at EOL, and children were more likely to be awake and be receiving enteral feeds. PPC involvement increased advance care planning, with lower hospital charges on day of death and 7 days before (respective differences $5058 [P = .02] and $25 634 [P = .02]). CONCLUSIONS: Pediatric AHD deaths are associated with high medical intensity; however, children with PPC consultation experienced substantially less invasive interventions at EOL. Further study is warranted to explore these findings and how palliative care principles can be better integrated into care.

Quality Improvement Basics: A Crash Course for Pediatric Cardiac Care.

BACKGROUND: Lack of knowledge of quality improvement (QI) methodology and change management principles can explain many of the difficulties encountered when trying to develop effective QI initiatives in health care. METHODS: An interactive QI workshop at the 14th Annual Meeting of the Pediatric Cardiac Intensive Care Society provided an overview of the role of QI in health care, basic QI frameworks and tools, and leadership and organizational culture pitfalls. The top five QI projects submitted to the meeting were later presented to an expert QI panel in a separate session to illustrate examples of QI principles. RESULTS: Workshop presenters introduced two major QI methodologies used to design QI projects. Important first steps include identifying a problem, forming a multidisciplinary team, and developing an aim statement. Key driver diagrams were highlighted as an important tool to develop a project's framework. Several diagnostic tools used to understand the problem were discussed, including the "5 Why's," cause-and-effect charts, and process flowcharts. The importance of outcome, process, and balancing measures was emphasized. Identification of interventions, the value of plan-do-study-act cycles to fuel continuous QI, and use of statistical process control, including run charts or control charts, were reviewed. The importance of stakeholder engagement, transparency, and sustainability was discussed. Later, the top five QI projects presented highlighted multiple "QI done well" practices discussed during the preconference QI workshop. CONCLUSIONS: Understanding QI methodology and appropriately applying basic QI tools are pivotal steps to realizing meaningful and sustained improvement.