Emergency medical services for children and pediatric subspecialty practice: a call to action.

For many pediatric subspecialists, their role in the emergency medical services for children system is unclear. However, subspecialists have an affirmative responsibility to contribute to development of a system that integrates consumers and providers from each subsystem. Avoiding fragmentation with an integrated system will yield the best outcome for patients while minimizing resource utilization. Additional roles for the subspecialist include responsibilities for advocacy, for guiding policy decisions and implementation, and for education, quality assurance, and research.

Metoclopramide-induced methemoglobinemia.

The case of a 3-week-old male infant is described. After receiving an iatrogenic overdose of metoclopramide (1.0 mg/kg every six hours) throughout a 36-hour period for the treatment of suspected gastroesophageal reflux, he became cyanotic, lethargic, and irritable, he fed poorly, and he had diarrhea and respiratory distress. Methemoglobinemia (20.5%) and reduced oxyhemoglobin saturation (79%) were identified. The patient had an excellent clinical response following a single IV dose of methylene blue. Subsequently, methemoglobin reductase activity was normal and there was no measurable hemoglobin M. The diagnosis of methemoglobinemia should be considered in any infant receiving large doses of metoclopramide who has clinical findings of cyanosis, ashen color, or a history of lethargy and/or motor restlessness.

Contribution of heritable disorders to mortality in the pediatric intensive care unit.

OBJECTIVES: To determine the percentage of patients dying in the pediatric intensive care unit (PICU) who have heritable disorders and to compare vital statistics classification of underlying cause of death with underlying heritable disorder identified from medical record review. DESIGN: Retrospective medical record review. SETTING: The PICU of a university-affiliated hospital. METHODS: Medical records were reviewed for all deaths occurring in the PICA over a 5-year period. Further review, including hospital course, clinical findings, and the presence or absence of a genetic evaluation, was accomplished for those patients found to have a chromosome abnormality, recognized syndrome, single major malformation, or unrecognized syndrome. Underlying cause of death classification obtained from the Center for Health Statistics, Arkansas Department of Health was reviewed to determine the frequency with which the underlying heritable disorder was recorded. RESULTS: Fifty-one of 268 (19%) deaths during the study period were in patients with heritable disorders. Of these 51 patients, eight (16%) had chromosome abnormalities, 17 (33%) had a recognized syndrome, 15 (29%) had a single primary defect in development, and 11 (22%) had an unrecognized syndrome. Genetic evaluation was carried out on 45% of patients, with the frequency of evaluation differing between categories of patients with heritable conditions. When underlying cause of death from vital statistics classification was reviewed, 21 of 51 (41%) records did not include the underlying heritable disorder. CONCLUSIONS: Heritable disorders are a frequent cause of mortality in the PICU. Vital statistics classification of underlying cause of death in this population often fails to identify heritable disorders, leading to an underascertainment of these conditions in mortality statistics. Improved cause of death classification procedures will be necessary to target public health interventions to etiology-specific populations.

Volume-outcome relationships in pediatric intensive care units.

CONTEXT: Pediatric intensive care units (PICUs) have expanded nationally, yet few studies have examined the potential impact of regionalization and no study has demonstrated whether a relationship between patient volume and outcome exists in these units. Documentation of an inverse relationship between volume and outcome has important implications for regionalization of care. OBJECTIVES: This study examines relationships between the volume of patients and other unit characteristics on patient outcomes in PICUs. Specifically, we investigate whether an increase in patient volume improves mortality risk and reduces length of stay. DESIGN AND SETTING: A prospective multicenter cohort design was used with 16 PICUs. All of the units participated in the Pediatric Critical Care Study Group. Participants. Data were collected on 11 106 consecutive admissions to the 16 units over a 12-month period beginning in January 1993. MAIN OUTCOME MEASURES: Risk-adjusted mortality and length of stay were examined in multivariate analyses. The multivariate models used the Pediatric Risk of Mortality score and other clinical measures as independent variables to risk-adjust for illness severity and case-mix differences. RESULTS: The average patient volume across the 16 PICUs was 863 with a standard deviation of 341. We found significant effects of patient volume on both risk-adjusted mortality and patient length of stay. A 100-patient increase in PICU volume decreased risk-adjusted mortality (adjusted odds ratio:.95; 95% confidence interval:.91-.99), and reduced length of stay (incident rate ratio:.98; 95% confidence interval:.975-.985). Other PICU characteristics, such as fellowship training program, university hospital affiliation, number of PICU beds, and children's hospital affiliation, had no effect on risk-adjusted mortality or patient length of stay. CONCLUSIONS: The volume of patients in PICUs is inversely related to risk-adjusted mortality and patient length of stay. A further understanding of this relationship is needed to develop effective regionalization and referral policies for critically ill children.

Tension pneumopericardium in an infant.

Pneumopericardium in newborns is most often a complication of mechanical ventilation and frequently results in fatal cardiac tamponade. We report the case of a mechanically ventilated 33-day-old full-term gestation infant with interstitial pneumonitis who developed tension pneumopericardium. Treatment includes lowering peak inspiratory pressure and decompressing the pericardial space with tube drainage following pericardiocentesis.

Septic shock in children: bacterial etiologies and temporal relationships.

In a retrospective analysis of 2110 admissions to the pediatric intensive care unit, 564 cases of septic shock were identified (26.7% of the total admissions). Septic shock was defined in patients with: (1) clinical evidence of sepsis; (2) fever (greater than 38.3 degrees C) or hypothermia (less than 35.6 degrees C); (3) tachycardia; (4) tachypnea; and (5) inadequate organ perfusion. Inadequate perfusion was defined as hypotension or evidence of peripheral hypoperfusion (poor capillary refill or cyanosis with hypoxemia, oliguria, acidosis or altered mentation). Inotropic support was required to maintain an adequate blood pressure and perfusion in 268 of 564 patients (47.5%). Septic shock with confirmed bacterial infection occurred in 143 patients (143 of 564, 25.2%); these cases were caused by Haemophilus influenzae, type b (59 of 143, 41.3%), Neisseria meningitidis (26 of 143, 18.2%) and Streptococcus pneumoniae (16 of 143, 11.2%). Eight of 564 (1.4%) cases of septic shock were not clinically apparent on initial evaluation and were diagnosed within 24 hours after admission to the hospital. We conclude that septic shock occurs more frequently in children than previously appreciated and may develop after admission to the hospital.

Family acceptance of home apnea monitors.

Home monitoring for apnea patients has been called a stressful situation for family members. A 28-item questionnaire was used to ascertain the impact of home monitoring on the families of children with infantile apnea. Forty of 71 families returned the questionnaire. The majority of respondents felt the stress of home monitoring to be minimal (42.5%) to moderate (37.5%). All respondents favored home monitoring with 80% of parents reporting that the monitor had alerted them to at least one significant apnea or bradycardia episode during the first month of use. Half of parents reported more than five significant alarms in the first month of use. Financial hardship on the family was reported to be minimal. A few parents related significant strain on marital and other sibling-parent relationships. Concerns most commonly voiced were mechanical problems (70%), difficulty in locating qualified and willing babysitters (62.5%), and desire for more concrete information from the physician regarding the child's medical problem (40.0%). These results confirm good acceptance of home monitors by the family and offer direction in dealing with the families' primary concerns.

Outcome evaluations as measures of quality in pediatric intensive care.

In recent years, interest in assessing quality of care has blossomed. Quality care may be defined as providing the most appropriate treatment and providing it with great technical and managerial skill and proficiency in a manner that gains patient acceptance. For assessment purposes, variation in risk-adjusted outcomes between providers should be attributable to quality of care differences. Some methods for measuring outcomes and risk-adjustment for pediatric intensive care populations have been developed, but additional tools are needed for applications in outcomes management, continuous quality improvement, and outcomes research.

Assessing the outcome of pediatric intensive care.

To describe the short-term outcome of pediatric intensive care by quantifying overall functional morbidity and cognitive impairment, I developed the Pediatric Overall Performance Category (POPC) and the Pediatric Cerebral Performance Category (PCPC) scales, respectively. A total of 1469 subjects (1539 admissions) were admitted to the pediatric intensive care unit of Arkansas Children's Hospital from July 1989 through December 1990. Patients were assigned baseline POPC and PCPC scores derived from historical information and discharge scores at the time of discharge from the hospital (or from the pediatric intensive care unit for patients with multiple hospitalizations). Delta scores were calculated as the difference between the discharge scores and the baseline scores. The changes in POPC and PCPC scores were associated with several measures of morbidity (length of stay in the pediatric intensive care unit, total hospital charges, and discharge care needs) and with severity of illness (pediatric risk of mortality score) or severity of injury (pediatric trauma score) (p less than 0.0001). Interrater reliability was excellent (r = 0.88 to 0.96; p less than 0.001). The POPC and PCPC scales are apparently reliable and valid tools for assessing the outcome of pediatric intensive care.

Outcome of cardiopulmonary resuscitation in children.

A study was undertaken in order to identify factors correlated with the outcome of pediatric cardiopulmonary resuscitation (CPR). A total of 35 children who experienced a total of 41 cardiopulmonary arrests were included. Sixteen of 41 patients (39%) could not be resuscitated; 16/41 (39%) were resuscitated temporarily but did not survive to discharge; 9/41 (22%) survived to discharge. Patients arresting outside the hospital who received early basic CPR at the scene were significantly more likely to be resuscitated, at least temporarily, than those who did not (8/8 vs 5/11; P = 0.02). A statistically significant difference in outcome was also demonstrated between patients with an initial arterial blood pH greater than 7.0 and those with an initial arterial blood pH less than 7.0 (P less than 0.05). We conclude that an initial arterial blood pH less than 7.0 predicts a poor outcome from cardiopulmonary arrest in children. Access to early basic CPR may improve the initial pH and the ability of the patient to be resuscitated.

Water intoxication and death associated with the use of posterior pituitary injection for surgical hemostasis.

Posterior pituitary injection is an extract prepared from the dried posterior lobe of the pituitary gland from domestic animals containing two octapeptide hormones, oxytocin and vasopressin. Posterior pituitary injection carries an approved therapeutic indication as an adjunct measure for achieving surgical hemostasis. We report a case of cerebral edema and death attributed to water intoxication in a child who had received a large volume of free water concurrent with posterior pituitary injection to control bleeding after tonsillectomy and adenoidectomy.

Adoption of intraosseous infusion technique for prehospital pediatric emergency care.

A telephone survey was conducted, contacting 51 designated state EMS offices, to determine the extent of use of intraosseous (IO) infusions in prehospital pediatric emergency care nationally and to identify common means of promoting IO adoption, training EMS personnel, and monitoring intraosseous field use. Less than half of the respondents reported actual prehospital use of IO infusions in pediatric patients, and an additional third indicated that they were unaware of any future plans for introducing the technique into EMS practice. This study's documentation of the current limited prehospital use of intraosseous infusions indicates a need for concerted efforts to promote broad adoption and continued evaluation of the IO technique in prehospital pediatric emergency care. Suggestions to enhance adoption include increased utilization of existing successful IO teaching approaches, development of national EMS standards regarding intraosseous infusions, active involvement of EMS regulatory agencies for widespread practice changes, and consistent quality assurance activities.

Services for parental stress reduction in a pediatric ICU.

The stress of having their child in an ICU can be alleviated by keeping parents informed, ensuring positive relationships between staff and parents, providing concrete services that meet parents' needs, and maximizing parental involvement in the care of their child. We interviewed the parents of 22 children cared for in a pediatric ICU to determine how well their needs were met by the staff and facilities. Responses confirmed the importance of the 4 interventions listed above and indicated a high degree of satisfaction. The results emphasized the need for ICU staff to introduce themselves repeatedly to parents and make certain parents know who is responsible for their child's care, and to encourage parents to ask questions about their child's illness and therapy.

Sleep-associated breathing disorders in morbidly obese children and adolescents.

Forty-one children and adolescents with a history of breathing difficulty during sleep and morbid obesity, defined as greater than 150% ideal body weight, underwent polysomnography to determine the incidence of sleep-associated breathing disorders. Seventeen patients also performed pulmonary function testing. The mean patient age was 10.3 +/- 4.4 (SD) years, and mean percent of ideal body weight was 208 +/- 42.2. A sleep history questionnaire showed that all patients snored, but frank apnea was reported in only 32%. The pulmonary function tests showed 18% (3/17) with a restrictive defect and 47% (8/17) with obstructive changes. The polysomnograms in 37% (15/41) of the patients were abnormal because of apnea, hypopnea, excessive arousals, or abnormalities in gas exchange. Multiple regression analysis demonstrated no significant association between weight, age, or gender and any physiologic measure on the polysomnogram. Most of the abnormal polysomnograms (13/15) were mildly abnormal, but two showed sufficiently severe abnormalities to require clinical intervention. We conclude that children and adolescents with morbid obesity are at risk for sleep-associated breathing disorders; their polysomnographic abnormalities are usually mild but rarely may be severe enough to require clinical intervention.

Critical care for clonidine poisoning in toddlers.

Clonidine may be a source of serious toxicity when ingested by toddlers. We describe 11 cases of clonidine ingestion by toddlers (mean dose 0.15 mg/kg; range 0.01 to 0.57). The source of the clonidine was a grand-parent in six of 11 cases. Symptoms included altered level of consciousness (n = 11), miosis (n = 5), bradycardia (n = 8), hypotension (n = 5), apnea and respiratory depression (n = 6), hypothermia (n = 5) and hypertension (n = 3). Therapeutic interventions included naloxone (n = 8) and atropine (n = 4), dopamine (n = 1), fluid resuscitation (n = 4), and endotracheal intubation (n = 1). There were no deaths. Symptoms of clonidine ingestion were typically mild if the dose ingested was less than 0.01 mg/kg, while bradycardia and hypotension occurred usually with doses of greater than 0.01 mg/kg. Apnea and respiratory depression were common when the dose exceeded 0.02 mg/kg. More effective measures are needed to prevent these potentially serious intoxications.

Behavioral changes in pediatric intensive care units.

OBJECTIVE: The purposes of this study were to compare the frequency and severity of manifestations of anxiety, depression, delirium, and withdrawal in pediatric patients hospitalized in intensive care unit vs ward settings and to evaluate the impact of preexisting psychopathologic disorders on the expression of these symptoms. RESEARCH DESIGN: Prospective patient series. SETTING: Tertiary care pediatric center. PATIENTS: Forty-three subjects aged 6 to 17 years hospitalized in either the pediatric or cardiovascular intensive care unit (n = 18) or on the general wards (n = 25) were recruited to participate. Subjects were excluded if their parents were unavailable for diagnostic interview or if they could not answer interview questions themselves. SELECTION PROCEDURES: Consecutive sample. INTERVENTIONS: None. MEASUREMENTS AND RESULTS: The Hospital Observed Behavior Scale, developed for this study, was used to describe objectively subjects' manifestations of anxiety, depression, delirium, and withdrawal. The Diagnostic Interview for Children and Adolescents and Diagnostic Interview for Children and Adolescents-Parents were used to determine the presence of preexisting psychopathologic disorders. As measured by the Hospital Observed Behavior Scale, subjects in the intensive care unit exhibited apprehension, anxiety, detachment, sadness, and weeping more often than did patients in the ward. Behavior was also significantly influenced by severity of illness, duration of hospitalization, number of previous hospitalizations, and presence of a preexisting anxiety or mood disorder. We found the Hospital Observed Behavior Scale to have good interrater reliability. CONCLUSIONS: Our data indicate that critically ill children in the intensive care unit, children with prolonged or repeated hospitalizations, and children with preexisting anxiety and mood disorders are at greater risk than other hospitalized pediatric patients for psychological trauma and/or behavior problems that may warrant psychiatric intervention. The Hospital Observed Behavior Scale is a reliable tool to quantitate behaviors in hospitalized children.

Differentiation of systemic infection and congenital obstructive left heart disease in the very young infant.

BACKGROUND: The differentiation of severe systemic infection, such as sepsis or meningitis, from a congenital obstructive left heart abnormality presents a unique challenge to clinicians responsible for the care of such infants in the first few weeks of life. Clinical findings are very similar in the two populations. Failure to identify the need for specific intervention, such as prostaglandin administration, by the primary care or emergency physician may result in increased morbidity or death in these infants. METHODS: We undertook a retrospective review of critically ill infants 0 to 28 days of age presenting with either bacterial sepsis or meningitis or a congenital obstructive left heart syndrome (COLHS), in order to identify historical, physical, or laboratory findings which might differentiate the two groups at presentation. Discriminant analysis was performed using the presence or absence of COLHS as the dependent variable. A COLHS index was derived to determine its sensitivity and specificity for differentiating the two groups. RESULTS: The presence of cardiomegaly predicted COLHS with 85% sensitivity and 95% specificity. Cardiomegaly had a positive predictive value for COLHS of 0.95. Unfortunately, most of the other variables which, individually or in combination, were significantly different between the two groups demonstrated poor sensitivity for prediction of the presence of obstructive left heart disease. Eleven of the predictor variables were chosen for inclusion in the multivariate model, and a COLHS index was developed which correctly classified 62/63 cases (98% sensitivity, 100% specificity). CONCLUSIONS: We conclude that while it is very difficult to differentiate these two groups at presentation, early clinical suspicion of COLHS with attention to key clinical parameters identified in this study may expedite appropriate intervention and enhance outcome. The multivariate model derived may provide a template from which further research can elucidate a more clinically useful tool for the clinician.

Relationship of illness severity and length of stay to functional outcomes in the pediatric intensive care unit: a multi-institutional study.

OBJECTIVE: The purpose of this study was to establish relationships between illness severity, length of stay, and functional outcomes in the pediatric intensive care unit (PICU) by using multi-institutional data. We hypothesized that a positive relationship exists between functional outcome scores, severity of illness, and length of stay. DESIGN: The study used a prospective multicentered inception cohort design. SETTING: The study was conducted in 16 PICUs across the United States that were member institutions of the Pediatric Critical Care Study Group of the Society of Critical Care Medicine. PATIENTS: In total, 11,106 patients were assessed, representing all admissions to these intensive care units for 12 consecutive months. MEASUREMENTS: Functional outcomes were measured by the Pediatric Overall Performance Category (POPC) and Pediatric Cerebral Performance Category (PCPC) scales. Both scales were assessed at baseline and discharge from the PICU. Delta scores were formed by subtracting baseline scores from discharge scores. Other measurements included admission Pediatric Risk of Mortality scores, age, operative status, length of stay in the PICU, and diagnoses. Interrater reliability was assessed by using a set of ten standardized cases on two occasions 6 months apart. MAIN RESULTS: Baseline, discharge, and delta POPC and PCPC outcome scores were associated with length of stay in the PICU and with predicted risk of mortality (p < .01). Incorporation of baseline functional status in multivariate length of stay analyses improved measured fit. Mild baseline cerebral deficits in children were associated with 18% longer PICU stays after controlling for other patient and institutional characteristics. Moderate and severe baseline deficits for both the POPC and PCPC score predict increased length of stay of between 30% and 40%. On the standardized cases, interrater consensus was achieved on 82% of scores with agreement to within one neighboring class for 99.7% of scores. CONCLUSIONS: These data establish current relationships for the POPC and PCPC outcome scales based on multi-institutional data. The reported relationships can be used as reference values for evaluating clinical programs or for clinical outcomes research.