Implementation of a Clinical Pathway for Chest Pain in a Pediatric Emergency Department.

OBJECTIVE: To evaluate the impact of a pediatric emergency department (ED) chest pain clinical pathway on resource utilization. METHODS: Motivated by perceived overuse of cardiology consultation for non-cardiac chest pain in the ED, clinicians from the Divisions of Cardiology and Emergency Medicine collaboratively developed a chest pain clinical pathway, educated staff, and implemented the pathway on March 1, 2014. We reviewed records of children aged 3 to 18 years without prior diagnoses of heart disease who presented to the ED with chest pain between March 1, 2013, and April 22, 2015. We compared diagnostic testing rates, ED length of stay, and cardiology consults before and after implementation of the pathway. RESULTS: A total of 1687 patients were pathway eligible (675 patients preimplementation and 1012 postimplementation). Resource utilization was lower than expected before pathway implementation and remained low after implementation. There was a statistically significant reduction in rates of chest x-ray ordering after pathway implementation and ED length of stay but no change in other diagnostic testing or cardiology consultation. Follow-up in our health care system for pediatric chest pain increased from 15% to 29% with implementation, but none of these visits resulted in the diagnosis of a new cardiac condition. There were no instances identified where use of the pathway resulted in missed cardiac disease. CONCLUSIONS: Implementation of a clinical pathway for pediatric chest pain did lead to a reduction in chest x-ray ordering in the ED and was associated with a higher rate of outpatient follow up for non-pathologic chest pain. Preimplementation utilization was lower than the prepathway perceptions of overuse suggested.

Genotype- and mutation site-specific QT adaptation during exercise, recovery, and postural changes in children with long-QT syndrome.

BACKGROUND: Exercise stress testing has shown diagnostic utility in adult patients with long-QT syndrome (LQTS); however, the QT interval adaptation in response to exercise in pediatric patients with LQTS has received little attention. METHODS AND RESULTS: One-hundred fifty-eight patients were divided into 3 groups: Those with LQTS type 1 (LQT1) or LQTS type 2 (LQT2) and normal control subjects without cardiovascular disease. Each patient underwent a uniform exercise protocol with a cycle ergometer followed by a 9-minute recovery phase with continuous 12-lead ECG monitoring. Each patient underwent a baseline ECG while resting in the supine position and in a standstill position during continuous ECG recording to determine changes in the QT and RR intervals. Fifty patients were gene-positive for LQTS (n=29 for LQT1 and n=21 for LQT2), and the control group consisted of 108 patients. QT interval adaptation was abnormal in the LQT1 patients compared with LQT2 and control patients (P<0.001). A corrected QT interval (QTc) >460 ms in the late recovery phase at 7 minutes predicted LQT1 or LQT2 versus control subjects with 96% specificity, 86% sensitivity, and a 91% positive predictive value. A recovery ΔQTc((7 min-1 min)) >30 ms predicted LQT2 versus LQT1 with 75% sensitivity, 82% specificity, and a 75% positive predictive value. The postural ΔQT was significantly different between LQTS and control groups (P=0.005). CONCLUSIONS: Genotype-specific changes in repolarization response to exercise and recovery exist in the pediatric population and are of diagnostic utility in LQTS. An extended recovery phase is preferable to assess the repolarization response after exercise in the pediatric population.

A pilot study of the feasibility of heart screening for sudden cardiac arrest in healthy children.

BACKGROUND: In children, sudden cardiac arrest (SCA) is associated with structural and electrical cardiac abnormalities. No studies have systematically screened healthy school children in the United States for conditions leading to SCA to identify those at risk. METHODS: From June 2006 to June 2007, we screened 400 healthy 5- to 19-year-olds (11.8 ± 3.9 years) in clinical offices at The Children's Hospital of Philadelphia using a medical and family history questionnaire, weight, height, blood pressure, heart rate, cardiac examination, electrocardiogram (ECG), and echocardiogram (ECHO). Our goals were to determine the feasibility of adding an ECG to history and physical examination and to identify a methodology to be used in a larger multicenter study. A secondary objective was to compare identification of cardiovascular abnormalities by history and physical examination, ECG, and ECHO. RESULTS: Previously undiagnosed cardiac abnormalities were found in 23 subjects (5.8%); an additional 20 (5%) had hypertension. Potentially serious cardiac conditions were identified in 10 subjects (2.5%); 7 were suspected or identified by ECG and 3 more only by ECHO. Only 1 of the 10 had symptoms (previously dismissed); none had a positive family history. CONCLUSIONS: It is feasible to screen for conditions associated with SCA in healthy children by adding ECG to history and physical examination. In this nongeneralizable sample, ECG identified more cases compared to history and physical examination alone, with further augmentation from ECHOs. Improvements in ECG and echocardiographic normative standards, representing age, gender, race, and ethnicity, are needed to increase the efficacy of screening in a young population.

Congenital long QT syndrome and 2:1 atrioventricular block: an optimistic outcome in the current era.

BACKGROUND: Previous studies of patients with long QT syndrome (LQTS) and 2:1 atrioventricular block (AVB) have reported a mortality rate greater than 50% during infancy. OBJECTIVE: The purpose of this study was to determine the outcome of this high-risk population in the current era. METHODS: A retrospective study from four tertiary care pediatric centers assessed patients with congenital LQTS and 2:1 AVB from January 2000 to January 2009. All neonates who presented with 2:1 AVB and prolonged QTc unrelated to medication were included in the study. Statistical analysis was performed using a paired t-test. Medical records were reviewed for ECG findings, genotype, medications, and device therapy. RESULTS: Twelve patients that met the inclusion criteria were identified. All patients underwent diagnostic ECG in the first 24 hours of life. The average QTc interval prior to therapy was 616 +/- 99 ms (range 531-840 ms). Over a follow-up period of 71 +/- 45 months (range 15-158 months), 11 of 12 patients received devices (8 permanent pacemaker, 3 implantable cardioverter-defibrillator). Average age of device placement was 48 months (median 2 months, range 3 days to 10.5 years). All patients were treated with beta-blockers; mexiletine was added in three patients, and mexiletine and flecainide were added in one patient. Three (25%) patients experienced torsades de pointes while receiving beta-blockers, one of which was refractory to medical therapy. This patient underwent left cardiac sympathetic denervation and implantable cardioverter-defibrillator placement. Genotyping was available for 6 (50%) patients (2 SCN5A mutation, 4 KCNH2 mutation). At last follow-up, no mortality was observed. Follow-up QTc intervals had decreased (mean 480 +/- 20 ms, range 450-507 ms, P <.002). CONCLUSION: Management of patients with LQTS and 2:1 AVB presents unique challenges. Despite historical data indicating poor prognosis, our study represents a cohort of high-risk LQTS patients with a relatively optimistic outcome. This finding reflects early diagnosis and intervention, coupled with improved management strategies, in the current era.