Jon Kaufman

Correlation of abdominal site near-infrared spectroscopy with gastric tonometry in infants following surgery for congenital heart disease.

Objective: Splanchnic oximetry, as measured by near-infrared spectroscopy (NIRS), correlates with gastric tonometry as a means of assessing regional (splanchnic) oxygenation and perfusion. Design: Prospective, data-gathering study. Setting: Pediatric cardiac intensive care unit in a tertiary care children’s hospital. Subjects: Neonates and infants with congenital heart disease who underwent catheter intervention or surgical repair requiring cardiopulmonary bypass. Interventions: None. Measurements and Main Results: Twenty neonates and infants were studied within 48 hrs of surgery. We measured somatic saturation (rSO2) via NIRS sensors placed over the anterior abdomen (splanchnic bed) and dorsal lateral flank (renal bed). Somatic rSO2 readings were paired with simultaneous points of intramucosal gastric pH (pHi), measured by tonometry. The rSO2 readings were paired with serum lactate and measurements of systemic mixed venous saturation (S&OV0456;o2). There was strong correlation between the abdominal rSO2 and pHi (r = .79; p < .0001) as well as between abdominal rSO2 and S&OV0456;o2 (r = .89; p < .0001). There was also significant negative correlation between the abdominal rSO2 and serum lactate (r = .77; p < .0001). Correlations between the dorsal lateral (renal) rSO2 measurements and serum lactate and S&OV0456;o2 were also significant but not as strong. Conclusions: Abdominal site rSO2, measured in infants with either single or biventricular physiology, exhibits a strong correlation with gastric pHi as well as with serum lactate and S&OV0456;o2. The results indicate that rSO2 measurements over the anterior abdominal wall correlate more strongly than flank rSO2 with regard to systemic indices of oxygenation and perfusion. This study suggests that the NIRS monitor is a valid modality to obtain an easy, immediate, and noninvasive measurement of splanchnic rSO2 in infants following cardiac surgery for congenital heart disease.

A Handoff Protocol from the Cardiovascular Operating Room to Cardiac ICU Is Associated with Improvements in Care Beyond the Immediate Postoperative Period

BACKGROUND Handoff protocols from the cardiovascular operating room (CVOR) to the cardiac intensive care unit (CICU) can improve patient outcomes and delivery of care beyond the immediate postoperative period. In a prospective quality improvement study, a structured CVOR-to-CICU handoff protocol was implemented at a university-affiliated childrens hospital. As a parallel project, an initiative to reduce unplanned extubations in the CICU was implemented. METHODS In a 41-month period, 1,507 neonates, infants, children, and adults were admitted to the CICU from the CVOR after undergoing a surgical procedure. The study was divided into a 17-month prehandoff-protocol period (January 2009-May 2010) and a 24-month posthandoff-protocol period (June 2010-May 2012). The handoff protocol was intended to streamline the handoff process from the CVOR and throughout the transition to the CICU. The specifics of the handoff, as outlined in a bedside laminated flowchart, included patient transport from the CVOR, the cardiovascular surgeons report, the anesthesiologists report, and the patient status summary and care plan. RESULTS After introduction of the handoff protocol, there was a statistically significant and sustained reduction in the mean rate of unplanned extubations from 0.62 to 0.24 per 100 ventilator-days (p = .03). There was a statistically significant reduction in median ventilator time per patient--from 17 hours (interquartile range [IQR]: 5.3 to 57.7) to 12.8 hours (IQR: 4.8 to 31.8); p = .02). The mean rate of unplanned extubations was 0.26 in 2011 and 0.30 in 2012. CONCLUSIONS Implementation of a handoff protocol from the CVOR to the CICU was associated with sustained decrease in unplanned extubations and in mean ventilator times.

Oral feeding outcomes in neonates with congenital cardiac disease undergoing cardiac surgery.

BACKGROUND Achievement of adequate oral nutrition is a challenging task after early neonatal cardiac surgery. This study aims to describe predictors of oral feeding outcomes for neonates after early surgical interventions. MATERIALS AND METHODS A retrospective review of neonates admitted with congenital cardiac disease over a period of 1 year. We analysed predictors of the need for a feeding tube at discharge and the amount taken at each feeding. Multilevel modelling was used to look at individual change over time predicting oral amount at each feeding. RESULTS We identified 56 neonates. Diagnoses were heterogeneous; 23% of the infants had associated genetic syndromes and 45% required pre-operative mechanical ventilation. The median time from birth to surgery was 8.4 days, with 29 infants fed orally before surgery. The mean time from surgery to first oral feeding attempt was 12 hours. Time from surgery to oral feeding, the amount taken with first feeding, and cross-clamp times were significant predictors of oral feeding success, whereas the presence of a comorbidity--genetic abnormality--and longer ventilator dependency predicted failure. Almost half of the neonates required a feeding tube upon discharge, and no infant discharged was solely breastfed. Discharge with a feeding tube was associated with greater weight gain at that time. CONCLUSIONS Neonates with congenital cardiac disease face significant barriers to successfully achieving oral feeding on hospital discharge. Enteral feeding guidelines focus on physiological stabilisation and do not always address the developmental milestones necessary to support oral feeding. Future prospective studies are necessary to identify multimodal strategies to optimise early feeding.

Continuous infusion pentobarbital for refractory status epilepticus in children.

The purpose of this retrospective medical chart review was to describe dosing regimens and outcomes in children who received continuous pentobarbital therapy for refractory status epilepticus. Thirty patients (age = 6.5 ± 5.1 years; 67% male) received a mean loading dose of 5.4 ± 2.8 mg/kg with an initial infusion of 1.1 ± 0.4 mg/kg/h. Maximum infusion dose was 4.8 ± 2 mg/kg/h. Thirty-three percent of patients achieved sustained burst suppression without relapse; 66.7% experienced relapse, but 60% of those (n = 12) eventually reachieved burst suppression. Children achieving burst suppression within 24 hours of pentobarbital initiation and those older than age 5 years were 1.5 times more likely to have a positive outcome. None of these variables, however, achieved significance (Fisher exact test). Ninety-three percent of patients required inotropes; 66% acquired an infection; 10% had metabolic acidosis; and 10% experienced pancreatitis. Poor outcomes (death, encephalopathy) were observed in 33% of patients.

An Interdisciplinary Initiative to Reduce Unplanned Extubations in Pediatric Critical Care Units

OBJECTIVE: Unplanned extubations in pediatric critical care units can result in increased mortality, morbidity, and length of stay. We sought to reduce the incidence of these events by reliably measuring occurrences and instituting a series of coordinated interdisciplinary interventions. METHODS: This was an internal review board–approved quality improvement project. Data were prospectively collected from the electronic medical record, and analyzed over 24 months (January 1, 2009–December 2010), and divided into 3 periods: baseline (9 months), intervention with multiple rapid improvement cycles (8 months), and postintervention (7 months). Interventions included standardization of endotracheal tube taping practices upon admission, improved patient handoffs, systematic review of unplanned events, reexamination of sedation practices, and promotion of transparency of performance measures. RESULTS: The PICU experienced 21 events in the 9 months before the initiative, 13 events over the 8-month intervention period, and 5 events in the 7-month postintervention period. The cardiac intensive care unit (CICU) experienced 11, 4, and 0 events, respectively. Mean event rates per 100 patient days for each interval were 0.80, 0.50, and 0.29 for the PICU and 0.74, 0.44, and 0 for the CICU. Monthly event rates for the CICU were significantly different by using the Kruskal-Wallis test (P < .05) but not for the PICU (P = .36) CONCLUSIONS: Through accurate tracking, multiple practice changes, and promoting transparency of efforts and data, an interdisciplinary team reduced the number of unplanned extubations in both ICUs. This reduction has been sustained throughout the postintervention monitoring period.

The use of Arginine Vasopressin in neonates following the Norwood procedure

BACKGROUND Following the Norwood palliation, neonates may require an escalation of inotropic and vasoactive support. Arginine Vasopressin may be uniquely useful in supporting this population. MATERIALS AND METHODS A retrospective evaluation of neonates at this institution between November, 2007 and October, 2010 who received Arginine Vasopressin following the Norwood procedure. Data were recorded from the patient records at one hour prior to, and then 1, 2, 3, 4, 6, and 24 hours following Arginine Vasopressin initiation. RESULTS We included 28 neonates. The mean dose of Arginine Vasopressin was 0.0005 plus or minus 0.0003 units per kilogram per minute. There was an early response (less than 6 hours) characterised by an 8% increase in systolic blood pressure (p = 0.0004), a 100% increase in urine output (p = 0.02), and a 29% decrease in total fluid administration (p = 0.04). The late response (at 24 hours) revealed further increases in systolic blood pressure and urine output as well as a 53% decrease in serum lactate (p = 0.007) and increase in arterial pH from 7.36 to 7.45 (p less than 0.0001). These changes were not accompanied by increases in heart rate or inotrope score. CONCLUSIONS The initiation of Arginine Vasopressin in post-operative Norwood patients was temporally associated with an improvement in markers of perfusion including systolic blood pressure, urine output, lactate, and pH. Further studies are required to ascertain the efficacy of Arginine Vasopressin in this population.

Alkaline phosphatase activity after cardiothoracic surgery in infants and correlation with post-operative support and inflammation: a prospective cohort study.

IntroductionLimited evidence suggests that serum alkaline phosphatase activity may decrease after cardiac surgery in adults and children. The importance of this finding is not known. Recent studies, however, have identified a potential role for alkaline phosphatase as modulator of inflammation in multiple settings, including during adult cardiopulmonary bypass. We sought to describe the change in alkaline phosphatase activity after cardiothoracic surgery in infants and to assess for a correlation with intensity and duration of post-operative support, markers of inflammation, and short-term clinical outcomes.MethodsSub-analysis of a prospective observational study on the kinetics of procalcitonin in 70 infants (≤90 days old) undergoing cardiothoracic surgery. Subjects were grouped based on the use of cardiopulmonary bypass and delayed sternal closure. Alkaline phosphatase, procalcitonin, and C-reactive protein (CRP) levels were obtained pre-operation and on post-operative day 1. Mean change in alkaline phosphatase activity was determined in each surgical group. Generalized linear modeling and logistic regression were employed to assess for associations between post-operative alkaline phosphatase activity and post-operative support, inflammation, and short term outcomes. Primary endpoints were vasoactive-inotropic score at 24 hours and length of intubation. Secondary endpoints included procalcitonin/CRP levels on post-operative day 1, length of hospital stay, and cardiac arrest or death.ResultsMean decrease in alkaline phosphatase was 30 U/L (p = 0.01) in the non-bypass group, 114 U/L (p<0.0001) in the bypass group, and 94 U/L (p<0.0001) in the delayed sternal closure group. On multivariate analysis, each 10 U/L decrease in alkaline phosphatase activity on post-operative day 1 was independently associated with an increase in vasoactive-inotropic score by 0.7 (p<0.0001), intubation time by 6% (p<0.05), hospital stay by 5% (p<0.05), and procalcitonin by 14% (P<0.01), with a trend towards increased odds of cardiac arrest or death (OR 1.3; p = 0.06). Post-operative alkaline phosphatase activity was not associated with CRP (p = 0.7).ConclusionsAlkaline phosphatase activity decreases after cardiothoracic surgery in infants. Low post-operative alkaline phosphatase activity is independently associated with increased procalcitonin, increased vasoactive/inotropic support, prolonged intubation time, and prolonged hospital stay. Alkaline phosphatase may serve as a biomarker and potential modulator of post-operative support and inflammation following cardiothoracic surgery in infants.

Improved Nutrition Delivery and Nutrition Status in Critically Ill Children With Heart Disease

BACKGROUND: This initiative sought to improve nutrition delivery in critically ill children with heart disease admitted to the cardiac ICU (CICU) and neonates undergoing stage 1 palliation (S1P) for single-ventricle physiology through interdisciplinary team interventions. Specific goals were increased caloric and protein delivery for all patients and a more nourished state for infants with single ventricles at the time of discharge. METHODS: We developed a nutrition flow sheet in the electronic health record to track whether daily nutrition goals were met. Interventions included nurses reporting daily whether caloric and protein goals were met, mandatory involvement of feeding specialists, and introduction of an enteral nutrition guideline. For infants undergoing S1P, weight-for-age z score (as an indicator for assessing malnutrition) was calculated at admission and discharge. RESULTS: The percentage of patient days per month when daily caloric goals were met increased from 50.1% to 60.7%, and protein goals met increased from 51.6% to 72.7%. Hospital length of stay, need for ventilation, and mortality did not differ. Patients undergoing S1P demonstrated a statistically significant improvement in weight-for-age z score compared with the preintervention group (P = .003). Thirteen S1P patients were discharged undernourished in the preintervention group; 5 were severely undernourished. In the intervention group, 4 patients were discharged undernourished, and none were severely undernourished. CONCLUSIONS: This initiative resulted in improved nutrition delivery for a heterogeneous population of cardiac patients in the CICU as well as significant improvements in weight gain and nourishment status at discharge in infants undergoing S1P.

More and sooner, but not necessarily better.

Critically ill children have generalized nutrition compromise. The timing of parenteral nutrition (PN) initiation has been under debate in both adults and children. A recent report of a multi-national randomized control trial in children demonstrated clinical superiority of delaying initiation of parental nutrition, and was associated with improved clinical outcomes and a lower rate of infection. In this editorial, we discuss our communication with the authors and our experience in a large cardiac intensive care unit (CICU) in the United States where improved nutrition delivery, and early PN, has improved weight-for-age z-score (WAZ) but has not shown any difference in length of hospital stay or reduced ventilator times.

Extended survival and re-hospitalisation among paediatric patients requiring extracorporeal membrane oxygenation for primary cardiac dysfunction

BACKGROUND Although survival to hospital discharge among children requiring extracorporeal membrane oxygenation support for medical and surgical cardio-circulatory failure has been reported in international registries, extended survival and re-hospitalisation rates have not been well described in the literature. MATERIAL AND METHODS This is a single-institution, retrospective review of all paediatric patients receiving extracorporeal membrane oxygenation for primary cardiac dysfunction over a 5-year period. RESULTS A total of 74 extracorporeal membrane oxygenation runs in 68 patients were identified, with a median follow-up of 5.4 years from hospital discharge. Overall, 66% of patients were decannulated alive and 25 patients (37%) survived to discharge. There were three late deaths at 5 months, 20 months, and 6.8 years from discharge. Of the hospital survivors, 88% required re-hospitalisation, with 63% of re-admissions for cardiac indications. The median number of hospitalisations per patient per year was 0.62, with the first re-admission occurring at a mean time of 9 months after discharge from the index hospitalisation. In all, 38% of patients required further cardiac surgery. CONCLUSIONS Extended survival rates for paediatric hospital survivors of cardiac extracorporeal membrane oxygenation support for medical and post-surgical indications are encouraging. However, re-hospitalisation within the first year following hospital discharge is common, and many patients require further cardiac surgery. Although re-admission hospital mortality is low, longer-term follow-up of quality-of-life indicators is required