RESUMO
OBJECTIVES: Pediatric mental health presentations continue to increase across the US. These patients often board for significant periods of time and may require more resources than other acute non-mental health patients. This has important implications for the overall function of the emergency department (ED) as well as care of all ED patients. METHODS: This study evaluated a policy developed to allow for inpatient hospital admission when 30% of the ED was occupied by boarding patients at a tertiary care children's hospital. RESULTS: We found an increase in the number of patients for whom this policy applied, and increased days/month this policy was executed over time. There was an increase in the average ED LOS and left without being seen rate during this time which we hypothesize would have been higher without this policy. CONCLUSIONS: A hospital policy allowing mental health patients to be admitted to the inpatient hospital once stabilized has the potential to improve ED flow and functionality.
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Hospitalização , Admissão do Paciente , Humanos , Criança , Tempo de Internação , Estudos Retrospectivos , Serviço Hospitalar de EmergênciaRESUMO
OBJECTIVE: Dehydration is a commonly encountered problem worldwide. Current clinical assessment is limited by subjectivity and limited provider training with children. The objective of this study is to investigate a new noninvasive, point-of-care technology that measures capillary refill combined with patient factors to accurately diagnose dehydration. METHODS: This is a prospective observational study at a tertiary care children's hospital in Buenos Aires, Argentina. Patients were eligible if younger than 10 years who presented to the emergency department with vomiting and/or diarrhea whom the triage nurse deems to be potentially dehydrated. Patients had the digital capillary refill device done on presentation in addition to standard of care vital signs and weight. Patients had serial weights measured on hospital scales throughout their stay. The primary outcome was dehydration, which was calculated as a percent change in weight from admission to discharge. RESULTS: Seventy-six children were enrolled in the study with 56 included in the final analysis. A stepwise forward method selection chose malnutrition, temperature, and systolic blood pressure for the multivariable model. The area under the curve for the final model was fair (0.7431). To further look into the utility of such a device in the home setting where blood pressure is not available often, we reran the model without systolic blood pressure. The area under the curve for the final model was 0.7269. CONCLUSIONS: The digital capillary refill point-of-care device combined with readily available patient-specific factors may improve the ability to detect pediatric dehydration and facilitate earlier treatment or transfer to higher levels of care.
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Desidratação , Sistemas Automatizados de Assistência Junto ao Leito , Criança , Humanos , Lactente , Desidratação/diagnóstico , Desidratação/terapia , Estudos Prospectivos , Diarreia , TecnologiaRESUMO
Background: Monitoring of capillary refill time (CRT) is a common bedside assessment used to ascertain peripheral perfusion in a patient for a vast array of conditions. The literature has shown that a change in CRT can be used to recognize life-threatening conditions that cause decreased perfusion, such as sepsis, and aid in resuscitation. The current practice for calculating CRT invites subjectivity and produces a highly variable result. Innovative technology may be able to standardize this process and provide a reliable and accurate value for use in diagnostics and treatment. This study aimed to assess a new technology (DCR by ProMedix Inc.) for rapid, bedside, and noninvasive detection of CRT. Methods: This was a secondary analysis of a prospective observational study evaluating the accuracy of new technology towards CRT-guided diagnosis of sepsis. It was carried out in the adult emergency departments (ED) of an academic tertiary care medical center. Patients seeking care in the ED were determined eligible if they were > 18 years in age and exhibited chief complaints suggestive of possible sepsis. The CRT produced by the technology was compared to the gold standard manual waveform assessment. Results: 218 consecutive subject enrollments were included and multiple measurements were made on each patient. Data with irregular waveforms were excluded. A total of 692 waveforms were evaluated for CRT values by a pair of trained PhD biomedical engineers. The average age of the cohort was 50.62 and 51.4% female. Results showed a Pearson correlation coefficient of 0.91 for the device CRT compared to the CRT gold standard. The Pearson correlation coefficient for the two independent engineering review of the waveform data was 0.98. This device produces accurate, consistent results and eliminates the subjectivity of CRT measurements that is in practice currently.
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Sepse , Adulto , Feminino , Hemodinâmica , Humanos , Masculino , Microcirculação , Perfusão , Sepse/diagnóstico , Sepse/terapia , TecnologiaRESUMO
OBJECTIVE: Adolescent mental health is a rapidly escalating presentation to emergency departments in the United States with depression and suicidal thoughts being the most prevalent condition. Much of the research and focus has been on preventing future attempts. However, one outcome that may be very important in addition to focus on is the impact of presentations for thoughts without self-injury. The aim was to evaluate outcomes of interest for a larger prospective observational adolescent suicidal trial including frequency of suicide attempts versus thoughts and factors associated with each outcome. METHODS: This is a prospective pilot study of adolescents at a single pediatric emergency department between December 2016 and September 2017 with acute suicidality. We used descriptive statistics to compare chief complaint, medical history, Patient Health Questionnaire-9 (PHQ-9), and outcomes including final disposition and total emergency department length of stay (LOS). We used t tests for continuous outcomes, χ2 test for categorical data, and Fisher exact tests for categorical and sparse data (20% of cell sizes of <5). RESULTS: Forty-one patients were enrolled, with 43.9% having an attempt; 72.2% of attempts were the result of an ingestion, and approximately 54% were over-the-counter medications. The average (SD) LOS was 30.8 (31.2) hours, and 63% were discharged home to outpatient services. There were no significant differences in age, chief complaint (except overdose), medical history, final disposition, total LOS in the ED, and the PHQ-9. Scores of the PHQ-9 were, on average (SD), 18.51 (4.7) across the entire cohort, 18.06 (5.75) in patients with an attempt, and 18.87 (3.77) in patients without an attempt (P = 0.59). CONCLUSIONS: Adolescent mental health is a growing issue for pediatric emergency departments nationally. Prospective research to identify factors associated with worsening outcomes is important to identify and potentially modify if possible. This study did not find any specific factors associated with a suicide attempt, but found that less than half of patients presenting with suicidality actual made an attempt. Future research should focus on not only limiting suicide attempts but also using decreased emergency department visits for worsening thoughts as an outcome of interest.
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Ideação Suicida , Suicídio , Adolescente , Serviço Hospitalar de Emergência , Humanos , Projetos Piloto , Estudos Prospectivos , Estados UnidosRESUMO
OBJECTIVE: The aim of this study was to assess national trends in recreational and suicidal ingestions of over-the-counter cough preparations that contain Coricidin. METHODS: Using the American Association of Poison Control Center's National Poison Data System, we obtained data from 2004 to 2017 on patients aged 13 to 19 years with an ingestion of "Coricidin." We examined trends over time overall and ingestion intent (recreational vs suicidal) using linear regression. We compared patient characteristics, substances ingested, clinical effects and therapies, and outcomes by suicidal versus misuse or recreational intention. RESULTS: An initial search with the inclusion criteria found 19,213 calls that matched study inclusion criteria. On average, there was a yearly linear increase of 180.0 (95% confidence interval [CI], 136.6-223.3; P < 0.01) ingestions per year. Within suicide ingestions, there was an average yearly increase of 97.9 (95% CI, 66.9-128.9; P < 0.01) ingestions, and within misuse/recreational ingestions, there was an average yearly increase of 82.1 (95% CI, 60.3-103.9; P < 0.01) ingestions. The most common clinical effect was tachycardia, which occurred in 42.4% of ingestions. Altered mental status, mydriasis, and ataxia were all more common in misuse/recreational ingestions. Suicidal ingestions resulted in more hospital admissions and need for medical treatment. Recreational-use coded calls peaked in 2013, whereas calls coded for suicide attempts have continued to rise dramatically, with a 50% increase in the 14-year study period. CONCLUSION: Combination Coricidin products are a major source of morbidity in adolescents. Targeted preventive measures in primary care offices or larger-scale policy/legislative efforts may be helpful to address this.
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Centros de Controle de Intoxicações , Ideação Suicida , Adolescente , Ingestão de Alimentos , Humanos , Medicamentos sem Prescrição , Estudos Retrospectivos , Tentativa de Suicídio , Estados Unidos/epidemiologiaRESUMO
INTRODUCTION: Suicide is a leading cause of death among adolescents. Oregon ranks 17th nationally for youth suicide rates, and ingestion of medications as a means of suicide is common. Despite the high prevalence of intentional poisoning among youth in Oregon, information about medications used by children and adolescents for attempted suicide, in particular the sources of medications, is not readily available. METHODS: The objective of this study is to describe types and sources of medications used for intentional ingestion among patients seen by the Doernbecher Children's Hospital Child and Adolescent Psychiatry Consultation-Liaison Service. This was a retrospective analysis of patients seen by the Child and Adolescent Psychiatry Consultation-Liaison Service for intentional ingestion from 2015 to 2017. Data on 434 total intentional ingestions were collected, including demographic information, types of medications ingested, and sources of both over-the-counter (OTC) and prescription (Rx) medications. Ingestions without intent of suicide were excluded. Descriptive analysis of ingestion data was performed. RESULTS: Intentional ingestions included Rx and OTC medications in similar frequencies. For Rx medications, 68% of ingestions included patients' own Rxs. Eighty-eight percent of ingestions that were not the patients' own Rx belonged to someone else living in their home. For OTC medications, 66% of medications were available at home. CONCLUSIONS: Intentional ingestions among adolescents most frequently involve medications that are readily available in their homes, and these include both OTC and Rx medications. This study highlights the importance of securing medications at home as a preventative measure and the importance of anticipatory guidance for primary care providers.
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Medicamentos sem Prescrição , Intoxicação , Adolescente , Criança , Ingestão de Alimentos , Hospitais Pediátricos , Humanos , Intoxicação/epidemiologia , Estudos Retrospectivos , Tentativa de SuicídioRESUMO
OBJECTIVES: Pediatric mental health presentations to emergency departments (EDs) have shown dramatic increases nationally. This study aimed to identify the ability of patients discharged with mental health from the ED to establish outpatient care. METHODS: This was a cross-sectional study of all mental health patients aged 7 to 19 years who were seen by a child psychiatry consult team in a tertiary care pediatric ED from September 2016 to January 2017. Patients were contacted by phone at least 6 months after discharge. Data obtained included time to follow-up, reasons for delayed follow-up, type of provider seen, and frequency of outpatient visits. RESULTS: Two hundred twenty-eight charts were reviewed and 51 were successfully interviewed. The median age was 14 years and 61% were female. Most patients (61%) reported seeing a psychiatrist or therapist, whereas 19% reported a primary care provider and 19% reporting "other." The majority were able to establish care within 1 month (73%), whereas 9% reported never obtaining outpatient follow-up. Most patients (58%) were able to be seen more than once per month. The most common reason for delayed follow-up was provider availability. CONCLUSIONS: This study found that a large number of patients were able to be seen within 1 month of discharge for mental health care. However, almost 10% of patients never established outpatient care, which is concerning and is an area needing further research.
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Saúde Mental , Alta do Paciente , Adolescente , Criança , Estudos Transversais , Serviço Hospitalar de Emergência , Feminino , Humanos , Pacientes AmbulatoriaisRESUMO
OBJECTIVE: This study aimed to assess the association between the degree of headache relief obtained in the pediatric emergency department (PED) with abortive treatment and unscheduled return visits to the PED for a recurrent or persistent headache within 72 hours. METHODS: This was a retrospective observational study with 369 patients, all younger than 18 years, who presented to the PED with a primary complaint of either a headache or migraine. Patient and visit details were collected from the medical chart, along with presenting and discharge pain score. Percent pain reduction at discharge was determined through the following calculation: (Presenting Pain Score - Discharge Pain Score)/Presenting Pain Score. Associations were assessed using multivariable logistic regression. RESULTS: No significant association was found between the percent pain reduction and return to the PED (P = 0.49). Mean presenting pain score at the index visit was statistically higher for those who ended up returning to the PED versus those who did not (8.1 vs 7.4; P = 0.02). A trend toward increase in return visits was seen among patients who had a headache duration greater than 3 days (odds ratio, 1.99) and patients who experienced less than 50% pain reduction in the PED (odds ratio, 1.77). CONCLUSIONS: Complete resolution in the PED may not be necessary, given the lack of association between the degree of pain relief and revisit rates. Perhaps, the goal should be to achieve at least 50% pain reduction before discharge.
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Serviço Hospitalar de Emergência , Cefaleia , Transtornos de Enxaqueca , Manejo da Dor/normas , Criança , Cefaleia/terapia , Humanos , Transtornos de Enxaqueca/terapia , Alta do Paciente , Readmissão do Paciente , Estudos Retrospectivos , Resultado do TratamentoRESUMO
OBJECTIVE: Pediatric headaches are a common presentation to emergency departments accounting for almost half a million annual visits. Providers are left with the difficult task of deciding who has a secondary headache etiology that warrants neuroimaging. METHODS: We conducted a retrospective case-control study. Patients from a pediatric neuro-oncology clinic database with brain cancer and a headache at presentation were identified as cases. Controls were patients from 2 local pediatric tertiary care emergency departments with a final diagnosis of headache after negative neuroimaging. Clinical factors were decided a priori, and logistic regression was used to determine which clinical factors were related to case/control status. RESULTS: A total of 334 patients (203 controls and 131 cases) were included. Patients with a history of headaches had 0.5 (95% confidence interval [CI]: 0.3-0.9; P = 0.03) times the odds of being a case. Patients with vomiting had increased odds of being a case compared with controls regardless of the time of day (early morning 1.8 [95% CI: 1.0-3.2; P = 0.04] and non-early morning 6.6 [95% CI: 2.0-21.7; P < 0.01]). Patients with neurological signs had 10.3 (95% CI: 5.4-19.4; P < 0.01) times the odds of being a case, and patients with an associated seizure had 10.9 (95% CI: 3.8-30.7; P < 0.01) times the odds of being a case. CONCLUSIONS: This study identified clinical factors associated with pediatric brain neoplasms that may guide acute neuroimaging decisions. This study also provides insight into potential clinical factors to be studied prospectively to derive a clinical decision rule.
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Neoplasias Encefálicas/diagnóstico por imagem , Serviço Hospitalar de Emergência , Cefaleia/diagnóstico por imagem , Neuroimagem/métodos , Adolescente , Estudos de Casos e Controles , Criança , Diagnóstico Diferencial , Feminino , Humanos , Masculino , Estudos Retrospectivos , Convulsões , Vômito , Adulto JovemRESUMO
OBJECTIVES: To characterize the frequency of opioid prescribing for pediatric headache in both ambulatory and emergency department (ED) settings, including prescribing rates by provider type. STUDY DESIGN: A retrospective cohort study of Washington State Medicaid beneficiaries, aged 7-17 years, with an ambulatory care or ED visit for headache between January 1, 2012, and September 30, 2015. The primary outcome was any opioid prescribed within 1 day of the visit. RESULTS: A total of 51 720 visits were included, 83% outpatient and 17% ED. There was a predominance of female (63.2%) and adolescent (59.4%) patients, and 30.5% of encounters involved a pediatrician. An opioid was prescribed in 3.9% of ED and 1.0% of ambulatory care visits (P < .001). Pediatricians were less likely to prescribe opioids in both ED (-2.70 percentage point; 95% CI, -3.53 to -1.88) and ambulatory settings (-0.31 percentage point; 95% CI, -0.54 to -0.08; P < .001). CONCLUSIONS: Opioid prescribing rates for pediatric headache were low, but significant variation was observed by setting and provider specialty. We identified opioid prescribing by nonpediatricians as a potential target for quality improvement efforts.
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Analgésicos Opioides/administração & dosagem , Cefaleia/tratamento farmacológico , Padrões de Prática Médica/estatística & dados numéricos , Adolescente , Assistência Ambulatorial/estatística & dados numéricos , Criança , Estudos de Coortes , Serviço Hospitalar de Emergência/estatística & dados numéricos , Feminino , Humanos , Masculino , Estudos Retrospectivos , WashingtonRESUMO
OBJECTIVE: Adolescent intentional ingestions remain a significant public health problem in the United States with little research to date on the over-the-counter or prescription medicines that adolescents abuse. These data are important for anticipatory guidance by primary care providers, preventive health, and poison center outreach. METHODS: This was an observational study using the American Association of Poison Control Centers National Poison Data System. The study population consisted of all cases of patients aged 13 to 19 years from 2004 to 2013 with a coding of "intentional abuse." RESULTS: There were 95,695 patient calls that were coded for intentional abuse between 2004 and 2013 for adolescents aged 13 to 19 years. The most common agent reportedly ingested in intentional-abuse cases was antihistamine and/or decongestant with dextromethorphan, and this agent remained the most common throughout the 10-year study period. The next 4 most common agents remained similar across the study period as well and included ethanol, benzodiazepines, dextromethorphan alone, and marijuana. These 5 agents remained the most commonly reported across the study period for all US regions (West, Midwest, South Northeast, and US territories). CONCLUSIONS: Over a recent 10-year period, common cough preparations remain the most commonly reported intentional abuse ingestion among all years and regions for adolescents.
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Centros de Controle de Intoxicações/tendências , Transtornos Relacionados ao Uso de Substâncias/epidemiologia , Adolescente , Comportamento do Adolescente , Bases de Dados Factuais , Ingestão de Alimentos , Feminino , Humanos , Masculino , Medicamentos sem Prescrição/intoxicação , Medicamentos sob Prescrição/intoxicação , Estados Unidos/epidemiologia , Adulto JovemAssuntos
Hemodinâmica , Pigmentação da Pele , Humanos , Dedos/irrigação sanguínea , Perfusão , Capilares , PeleRESUMO
BACKGROUND: Migraine headaches are a common reason for pediatric emergency department (ED) visits. Small studies suggest the potential efficacy of sub-anesthetic doses of propofol for migraine with a favorable side effect profile and potentially decreased length of stay (LOS). OBJECTIVE: The objective of this study was to compare the efficacy of low-dose propofol (LDP) to standard therapy (ST) in pediatric migraine treatment. METHODS: We conducted a prospective, pragmatic randomized controlled trial from April 2014 through June 2016 in the ED at two pediatric hospitals. Patients aged 7-19 years were eligible if they were diagnosed with migraine by the emergency physician and had a presenting visual analog pain score (VAS) of 6-10. Primary outcome was the percent of pain reduction. Secondary outcomes were ED LOS, 24-h rebound headache, return visits to the ED, and adverse reactions. RESULTS: Seventy-four patients were enrolled, but 8 were excluded, leaving 66 patients in the final analysis (36 ST, 30 LDP). Pain reduction was 59% for ST and 51% for LDP (p = 0.34) with 72.2% vs. 73.3% achieving a VAS ≤ 4 with initial therapy (p = 0.92). There was a nonsignificant trend toward shorter median LOS from drug administration to final disposition favoring propofol (79 min vs. 111 min; p = 0.09). Rebound headache was significantly more common in the ST vs. LDP group (66.7% vs. 25.0%; p = 0.01). CONCLUSIONS: LDP did not achieve better pain reduction than ST, however, LDP was associated with significantly fewer rebound headaches and a nonsignificant trend toward shorter median LOS from drug administration to disposition.
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Transtornos de Enxaqueca/tratamento farmacológico , Manejo da Dor/normas , Propofol/administração & dosagem , Adolescente , Anestésicos Intravenosos/administração & dosagem , Anestésicos Intravenosos/farmacologia , Anestésicos Intravenosos/uso terapêutico , Criança , Serviço Hospitalar de Emergência/organização & administração , Feminino , Humanos , Injeções Intravenosas , Tempo de Internação/estatística & dados numéricos , Masculino , Manejo da Dor/métodos , Pediatria/métodos , Propofol/farmacologia , Propofol/uso terapêutico , Estudos Prospectivos , Resultado do Tratamento , Adulto JovemRESUMO
OBJECTIVE: Migraine headaches are common in the pediatric emergency department. The mainstay of abortive treatment consists of nonsteroidal anti-inflammatories and dopamine antagonists. The objective of this study was to compare the effectiveness of 3 commonly used dopamine antagonists to abort pediatric migraine. METHODS: This was a retrospective cohort study of all patients who presented to the pediatric emergency department at a tertiary care pediatric hospital between January 2010 and December 2013. Patients were treated for a migraine headache with a combination of ketorolac and one of the following dopamine antagonists: prochlorperazine, metoclopramide, or promethazine. The primary outcome was treatment failure and receiving non-evidence-based treatment defined by the need for opioids. Secondary outcomes included pain score reduction and return visit within 48 hours. RESULTS: There were 57 patients during this period with 67 visits that met inclusion criteria: 27 (40.3%) visits in which patients were treated with prochlorperazine, 23 (34.3%) visits in which patients were treated with metoclopramide, and 17 (25.4%) visits in which patients were treated with promethazine. Across visits, the mean age was 14.5 years, and 63% were women. Opioids were given for treatment failure in 8.7% of visits in which patients received prochlorperazine, 25% in which patients received metoclopramide, and 42.8% in which patients received promethazine. Patients treated with promethazine had significantly higher odds of needing opioids and experiencing less than 50% reduction in pain score compared with prochlorperazine after adjusting for patient characteristics. CONCLUSIONS: This study suggests variable efficacy among 3 commonly used dopamine antagonists for pediatric migraine headache. Promethazine seems least effective and results in higher use of opioids compared with other available dopamine antagonists.
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Antagonistas de Dopamina/uso terapêutico , Metoclopramida/uso terapêutico , Transtornos de Enxaqueca/tratamento farmacológico , Proclorperazina/uso terapêutico , Prometazina/uso terapêutico , Adolescente , Analgésicos Opioides/administração & dosagem , Anti-Inflamatórios não Esteroides/uso terapêutico , Criança , Estudos de Coortes , Quimioterapia Combinada , Serviço Hospitalar de Emergência , Feminino , Humanos , Cetorolaco/uso terapêutico , Masculino , Medição da Dor , Estudos Retrospectivos , Falha de Tratamento , Resultado do TratamentoRESUMO
BACKGROUND: The assessment of capillary refill time (CRT) is a common physical examination technique. However, despite its importance and its widespread use, there is little standardization, which can lead to inaccurate assessments. OBJECTIVE: In this article, we assessed how different physicians estimate CRT. We hypothesized that when different physicians are presented with the same recordings of CRT, clinicians will, on average, provide different CRT estimates. METHODS: Using recordings of different fingertip compressions, physicians assessed and documented when capillary refill had returned to normal. Videos were recorded of the fingertips only, with no other identifying markers or subject characteristics provided. Videos were shown at one-quarter speed to allow time for recognition and response to the capillary refill. The primary outcome was physician estimates of CRT for each video recording. RESULTS: An analysis of variance regression revealed significant differences in physician estimates of CRT when examining the same CRT videos from 34 subjects. Further regression analyses reveal the importance of controlling for the physician that is examining the patient when predicting a patient's CRT. CONCLUSIONS: Results indicate that some physicians gave, on average, slower CRT estimates, whereas others gave, on average, faster CRT estimates. Objective approaches and innovations in assessment of capillary refill have the potential to increase the diagnostic accuracy of this important clinical examination finding.
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Capilares/patologia , Dedos/irrigação sanguínea , Exame Físico/normas , Fatores de Tempo , Adulto , Análise de Variância , Pressão Sanguínea/fisiologia , Estudos de Coortes , Feminino , Dedos/fisiologia , Hemodinâmica/fisiologia , Humanos , Masculino , Exame Físico/métodos , Médicos/estatística & dados numéricos , Análise de RegressãoRESUMO
OBJECTIVES: Mental health complaints are a frequent presentation to the pediatric emergency department (PED). It is unclear if having an on-site inpatient pediatric psychiatric unit impacts pediatric mental health care in the acute setting. The objective of this study was to compare PED mental health care between a pediatric tertiary care center with an associated inpatient child psychiatric unit (PAPED) and one that does not (NOPED) with the hypothesis that children have longer lengths of stay (LOS) at the PED without an inpatient unit. METHODS: This was a retrospective, observational study of all mental health presentations aged 1 to 18 years to 2 tertiary care PEDs from March 2012 to June 2013 with a final mental health diagnosis International Classification of Diseases, Ninth Revision code. RESULTS: A total of 1409 patient encounters comprised the study group. The PAPED had a significantly higher rate of admission 41.3% versus 18.8% (P < 0.0001). The LOS was significantly longer at the NOPED compared with the PAPED with a visit of 15.6 versus 6.3, respectively (P < 0.0001). When LOS was stratified for disposition, patients requiring admission from the NOPED had a significantly longer LOS of 33.4 compared with an emergency department LOS of 8.1 at the PAPED (P < 0.0001). CONCLUSIONS: Mental health care in the PED seems to be affected by having an associated inpatient child psychiatric unit. Further research needs to address this growing problem and ways to utilize community resources to develop safe outpatient plans and divert admission if possible.
Assuntos
Criança Hospitalizada , Serviço Hospitalar de Emergência/organização & administração , Unidades Hospitalares/organização & administração , Transtornos Mentais/terapia , Adolescente , Criança , Pré-Escolar , Feminino , Pesquisa sobre Serviços de Saúde , Humanos , Lactente , Masculino , Oregon , Estudos Retrospectivos , Centros de Atenção TerciáriaRESUMO
The molecular basis for excitation-contraction coupling in skeletal muscle is generally thought to involve conformational coupling between the L-type voltage-gated Ca(2+) channel (CaV1.1) and the type 1 ryanodine receptor (RyR1). This coupling is bidirectional; in addition to the orthograde signal from CaV1.1 to RyR1 that triggers Ca(2+) release from the sarcoplasmic reticulum, retrograde signaling from RyR1 to CaV1.1 results in increased amplitude and slowed activation kinetics of macroscopic L-type Ca(2+) current. Orthograde coupling was previously shown to be ablated by a glycine for glutamate substitution at RyR1 position 4242. In this study, we investigated whether the RyR1-E4242G mutation affects retrograde coupling. L-type current in myotubes homozygous for RyR1-E4242G was substantially reduced in amplitude (â¼80%) relative to that observed in myotubes from normal control (wild-type and/or heterozygous) myotubes. Analysis of intramembrane gating charge movements and ionic tail current amplitudes indicated that the reduction in current amplitude during step depolarizations was a consequence of both decreased CaV1.1 membrane expression (â¼50%) and reduced channel Po (â¼55%). In contrast, activation kinetics of the L-type current in RyR1-E4242G myotubes resembled those of normal myotubes, unlike dyspedic (RyR1 null) myotubes in which the L-type currents have markedly accelerated activation kinetics. Exogenous expression of wild-type RyR1 partially restored L-type current density. From these observations, we conclude that mutating residue E4242 affects RyR1 structures critical for retrograde communication with CaV1.1. Moreover, we propose that retrograde coupling has two distinct and separable components that are dependent on different structural elements of RyR1.
Assuntos
Canais de Cálcio Tipo L/metabolismo , Proteínas Mutantes/genética , Proteínas Mutantes/metabolismo , Mutação , Canal de Liberação de Cálcio do Receptor de Rianodina/genética , Canal de Liberação de Cálcio do Receptor de Rianodina/metabolismo , Animais , Fenômenos Eletrofisiológicos/efeitos dos fármacos , Regulação da Expressão Gênica , Cinética , Camundongos , Fibras Musculares Esqueléticas/metabolismo , Proteínas Mutantes/química , Proteínas Recombinantes de Fusão/farmacologia , Canal de Liberação de Cálcio do Receptor de Rianodina/químicaRESUMO
OBJECTIVE: To describe the inpatient management of pediatric migraine and the association between specific medications and hospital length of stay (LOS). STUDY DESIGN: Historical cohort study review of patients age <19 years of age admitted to a single tertiary care children's hospital between 2010 and 2015 for treatment of migraine headache. RESULTS: The cohort consisted of 58 encounters with an average patient age of 14.3 years (SD 3.2 years) with a female predominance (62%). The mean number of inpatient medications received by patients was 3 (range 1-7), with dopamine antagonists and dihydroergotamine used most commonly (67% and 59% of encounters, respectively). The average LOS was 56 hours (95% CI 48.2-63.2) and did not vary by medication received, although patients who received an opioid had a significantly longer LOS (79.2 vs 47.9 hours respectively; P < .001). CONCLUSIONS: Children admitted to the hospital for treatment of migraine headache frequently require a large number of medications over an average hospital LOS of more than 2 days without apparent differences based on medication received other than prolonged stays for subjects who received opioids.