Comparative efficacy of oral dexamethasone versus oral prednisone in acute pediatric asthma.

OBJECTIVE: The objective was to determine whether 2 days of oral dexamethasone (DEX) is more effective than 5 days of oral prednisone/prednisolone (PRED) in improving symptoms and preventing relapse in children with acute asthma. STUDY DESIGN: This was a prospective randomized trial of children (2 to 18 years old) who presented to the emergency department with acute asthma. PRED 2 mg/kg, maximum 60 mg (odd days) or DEX 0.6 mg/kg, maximum 16 mg (even days) was used. At discharge children in the PRED group were prescribed 4 daily doses (1 mg/kg/d, maximum 60 mg); children in the DEX group received a prepackaged dose (0.6 mg/kg, maximum 16 mg) to take the next day. The primary outcome was relapse within 10 days. RESULTS: When DEX was compared with PRED, relapse rates (7.4% of 272 vs 6.9% of 261), hospitalization rates from the emergency department (11% vs 12%) or after relapse (20% vs 17%), and symptom persistence at 10 days (22% vs 21%) were similar. In the PRED group more children were excluded for vomiting in the emergency department (3% vs 0.3%; P =.008), more parents were noncompliant (4% vs. 0.4%; P =.004), and more children missed > or =2 days of school (19.5% vs. 13.2%; P =.05). CONCLUSION: In children with acute asthma, 2 doses of dexamethasone provide similar efficacy with improved compliance and fewer side effects than 5 doses of prednisone.

Sports-related concussions.

Concussion is the most common head injury occurring in sports participation. Concussions range from a brief period of neural dysfunction to a prolonged period of unconsciousness with retrograde amnesia. It is imperative that the pediatric emergency medicine specialist be familiar with the proper initial assessment of the child or adolescent athlete who has sustained a sports-related concussion, the latest grading scales of concussions, and the current recommendations for returning the athlete to competition. A systematic approach to the athlete who has suffered a concussion will minimize the risk of further injury or mortality.

Tick paralysis syndrome in a 5-year-old girl.

Tick paralysis syndrome (TPS) is an uncommon cause of ascending paralysis in children. Familiarity with its clinical features is important, since prompt diagnosis and removal of the tick is curative. We report the case of a 5-year-old girl with TPS manifested as lower extremity ataxia and paralysis and briefly discuss the salient features of TPS.

Evaluation of an ambu-bag valve with a self-contained, colorimetric end-tidal CO2 system in the detection of airway mishaps: an animal trial.

OBJECTIVE: Capno-Flo (Kirk Specialty Systems, Carrouton, TX) is a portable pulmonary resuscitator (self inflating ambu-bag--valve system) with a self-contained, colorimetric end-tidal CO2 detector that has the ability to provide continuous CO2 monitoring for up to 2 hours. The purpose of this study is to determine the accuracy and time interval for the Capno-Flo monitor to detect acute airway obstructions and hypopharyngeal extubations in an intubated animal model. SUBJECTS: Five anesthetized, non-paralyzed, mechanically ventilated Yorkshire minipigs. METHODS: Complete and partial airway obstruction was simulated with complete and partial cross-clamping of the endotracheal (ET) tube. Placement of the ET tube into the hypopharynx was performed to simulate accidental extubation. In addition to the Capno-Flo colorimetric indicator, both sidestream (SS) and mainstream (MS) capnography were used to monitor end-tidal CO2 and comparison. The time intervals for the capnograph wave to flatten and for the monitor to display "zero" were recorded after each airway alteration. Each experiment was carried out for 180 seconds, and a total of 25 trials was performed. RESULTS: Complete obstruction produced a color change in the Capno-Flo monitor in 9+/-2 seconds and flattening of the SS and MS waveform in 8+/-2 seconds and 6+/-2 seconds, respectively. The SS and MS monitors displayed zero in 49+/-7 seconds and 19+/-1 seconds, respectively. Partial obstruction did not produce color change, a flattening of the wave, or a monitor display of zero. Hypopharyngeal extubation produced a color change in 10+/-2 seconds, flattening of the SS and MS waveform in 7+/-2 seconds and 7+/-1 seconds, respectively. The SS and MS monitors displayed "zero" in 76+/-16 seconds and 18+/-3 seconds, respectively. CONCLUSION: The Capno-Flo identified all complete airway obstructions and hypopharyngeal extubations rapidly. The CF monitor performed comparable to the SS and MS capnographs. Neither the Capno-Flo, nor the sidestream, nor the mainstream capnographs detected partial airway obstruction. The clinical application of this portable inexpensive capnometer in the continuous monitoring of the intubated patient, especially the transport patient, should be investigated further.

Pediatric emergency department nurses' perspectives on fever in children.

BACKGROUND: Fever is the most common complaint of children seen in a Pediatric Emergency Department (PED). Since pediatric emergency nurses commonly educate parents on fever management, this study sought to examine their knowledge base regarding fever in children. METHODS: Through convenience sampling, pediatric emergency registered nurses working at one of four PEDs were surveyed using a self-administered questionnaire containing 10 open-ended questions pertaining to fever in children. RESULTS: Eighty-eight pediatric emergency registered nurses (median experience 8.0 years, range 3 months to 28 years) were surveyed. The median temperature considered by pediatric emergency nurses to be a fever was 38.0 degrees C (100.4 degrees F) with a range of 37.2 degrees C (99.0 degrees F) to 38.9 degrees C (102.0 degrees F), while the median temperature considered to be dangerous to a child was 40.6 degrees C (105.0 degrees F) with a range of 38.0 degrees C (100.4 degrees F) to 41.8 degrees C (107.0 degrees F). Eleven percent was not sure what temperature constituted a fever while 31% was not sure what temperature would be dangerous to a child. Fifty-seven percent considered seizures the primary danger to a febrile child while 29% stated permanent brain injury or death could occur from a high fever. Sixty percent chose acetaminophen as first line treatment while 7% stated alcohol or tepid water baths were also acceptable treatment options. Thirty-eight percent stated that a different medication should be added if a child was still febrile 1 hour after initial treatment while 31% would not use additional medication. Eighteen percent stated it was dangerous for a child to leave the PED if still febrile. CONCLUSION: Fever phobia and inconsistent treatment approaches occur among experienced pediatric emergency registered nurses. These phobias and inconsistencies subsequently could be conveyed to parents. In order to assure accurate parental education, PEDs should educate their medical team regarding the management of fever in children.

Utility of monitoring capnography, pulse oximetry, and vital signs in the detection of airway mishaps: a hyperoxemic animal model.

This study was undertaken to determine the time interval for changes in end-tidal CO2, oxygen saturation (SaO2), heart rate (HR), and blood pressure (BP) in response to an acute airway obstruction or hypopharyngeal extubation in a hyperoxemic model. Complete and partial airway obstructions were simulated with complete and partial cross-clamping of an endotracheal (ET) tube in five anesthetized, nonparalyzed, mechanically ventilated Yorkshire minipigs with initial PAo2 of > 400 mm Hg. Placement of the ET tube into the hypopharynx was performed to simulate accidental extubation. Both sidestream (SS) and mainstream (MS) capnography were used. Continuous pulse oximetry monitored SaO2, femoral arterial catheter monitored systolic BP, and electrocardiograph monitored HR. The time intervals for the capnograph wave to flatten and for the monitor to display zero were recorded after each airway alteration. The time interval to a change in the initial HR of 10 beats/min, a change of initial systolic BP of 10 mm Hg, and a change of initial SaO2 of 5% were recorded. Experiments were carried out for 180 seconds, and 25 trials were performed. HR, systolic BP, and SaO2 did not change for the 180-second duration of the trials. Complete obstruction produced a flattening of the SS and MS waveform in 8 +/- 2 seconds and 6 +/- 2 seconds, respectively. The SS and MS monitors displayed zero in 19 +/- 1 seconds and 68 +/- 7 seconds, respectively. Partial obstruction did not produce flattening of the wave or a monitor displaying zero. Hypopharyngeal extubation produced a flattening of the SS and MS waveform in 7 +/- 1 seconds and 7 +/- 2 seconds, respectively. The SS and MS monitors displayed zero in 18 +/- 3 seconds and 76 +/- 16 seconds, respectively. Continuous end-tidal CO2 capnography detects acute airway obstruction and hypopharyngeal extubation more rapidly than does pulse oximetry or vital sign monitoring in a hyperoxemic porcine model.

Peripherally inserted central venous catheter fracture and embolization to the lung.

We report an adolescent patient with a peripherally inserted central venous catheter fracture and subsequent migration of the catheter fragment through the heart and into the lower lobe of the right lung. Physical findings were unremarkable for indications of this pulmonary embolization. With the increasing use of such devices for prolonged venous access, the practicing pediatric emergency physician should be aware of this potential complication.

Use of thiocyanate elution to estimate relative avidity of allergen specific IgE antibodies.

Although several methods for estimating avidity of antigen-antibody reactions are available, most are impractical for the study of human IgE antibodies because of a requirement for pure allergen and antibody in relatively large amounts. To determine the relative avidity of specific IgE antibodies for Dermatophagoides pteronyssinus allergens, seven concentrations of the chaotropic thiocyanate ion were used to disrupt epitope-antibody binding in a specific IgE immunoassay system, using sera from 16 allergic patients with marked skin test reactivity to a standardized D. pteronyssinus extract. Relative avidity, the molarity of thiocyanate required to produce a 50% decrement in binding, ranged from 0.29-3.1. Within assay coefficient of variation (CV) was 9.9% and between assay CV was 13%. D. pteronyssinus specific IgE levels ranged from 0.66-141 kUa/L, not correlating with relative avidity (rho = -0.12). Thiocyanate elution appears to be a useful method for estimating relative avidity of specific IgE antibodies for the myriad epitopes of the allergenic proteins in an allergen extract. It could be used to study the immunochemistry of specific IgE assays; avidity maturation in allergen immunotherapy and in asymptomatic but sensitized patients; and preseasonal versus postseasonal changes in avidity within individuals. With a suitable solid phase, it could be modified to examine avidity at the epitope level.

Vocal cord dysfunction presenting as acute asthma in a pediatric patient.

We report a pediatric patient with an acute onset of paradoxical vocal cord movement which presented as his first episode of wheezing. History and physical examination suggested the diagnosis of vocal cord dysfunction, which was confirmed by a flexible fiberoptic nasophayrngoscopic examination. This is the first report of paradoxical vocal cord movement being made on initial presentation of wheezing in the emergency department and supports earlier reports that this diagnosis can be made in the pediatric population. The practicing pediatric emergency physician should consider the diagnosis of paradoxical vocal cord dysfunction in the differential diagnosis of wheezing in the pediatric patient, especially if the patient does not have the typical historical and physical findings associated with reactive airway disease.