Metered dose inhalers with spacers are devices capable of providing higher rates of lung deposition of drugs such as beta agonists when compared to conventional nebulizers, but there is no consensus about the optimal dose when this is the device of choice and there is evidence that younger children need proportionally higher doses of albuterol (in μg/kg) when compared to older children. Other factors that may interfere with response to albuterol treatment include the genetics of the beta adrenergic receptor (ADRβ2) and infectious etiology of the wheezing attack. This study will assess the effectiveness of a dose regimen that prioritizes higher doses of albuterol, with doses in μg/kg higher for younger children. Security of this new dosing regimen will be assessed by monitoring clinical side effects and serum levels of albuterol, but the investigators will also examine the presence of 12 different respiratory viruses in these patients and evaluate the influence of ADRβ2 receptor genetics in the response to albuterol. The primary outcome measure will be the need for hospitalization. Secondary outcomes will include a change in clinical score, respiratory rate and forced expiratory volume in the first second, the need for additional treatments and length of stay in the emergency room for those not hospitalized.
This is a prospective, randomized, double blinded, controlled study. The patients will be randomly assigned to one of the treatment groups (experimental or control groups). The patients will be assessed 1 hour later and every 30 minutes thereafter until discharge. Following 4 hours in the emergency room, any patient who do not meet the discharge criteria (PRAM score ≤ 3 and SpO2 ≥ 92%) will be admitted to the hospital. Each patient's attending physician will determine the need for additional therapies following the first hour. Identification of respiratory viruses in the nasal lavage samples wil be performed using the CLART PneumoVir® kit. Albuterol plasmatic levels will be analyzed via HPLC (High Performance Liquid Chromatography). To genotype the ADBR2 receptor (blood samples), the gene regions encompassing the Arg16Gly, Gln27Glu, and Arg19Cys Thr164Ile polymorphisms will be amplified via PCR. The resultant amplimers were then sequenced. A sample of 124 patients (62 in each group) was calculated to provide an 80% power with which to detect a significant difference of at least 30 minutes in the lengths of stay between the groups. The chi-square test will be used to compare hospital admission rates and tremor rates. For all other outcomes, t-tests for mean comparisons (variables with a normal distribution), a Mann Whitney test (nonparametric data) and ANOVA with repeated measures will be used.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
119
The Experimental group will receive higher doses of albuterol in the first hour: 900 mcg (up to 15 kg), 1200 mcg (\> 15 to 20 kg), 1500 mcg (\> 20 to 25 kg) and 1800 mcg (\> 25 kg).
The Control group will receive the following doses of albuterol in the first hour 600 mcg (up to 25 kg) or 1200 mcg (\> 25 kg)
Instituto da Crianca HCFMUSP
São Paulo, São Paulo, Brazil
Hospital Admission
Hospital admission was defined as the need to stay in the emergency room for more than 4 hours, due to the failure to meet the discharge criteria (PRAM score ≤ 3 and pulse oximetry, ≥ 92%)
Time frame: Starting at 4 hours post-treatment
Forced Expiratory Volume in the First Second
Change in FEV1 one hour post-treatment in comparison with baseline. Spirometry was performed only in subjects older than 6 years and who could perform the maneuver properly.
Time frame: One hour post-treatment in comparison with baseline
Change in PRAM Score After One Hour
Change in the Pediatric Respiratory Assessment Measure (PRAM) score one hour post-treatment in comparison with baseline. The PRAM score is used to assess the severity of asthma attacks, it ranges from 0 to 15, and the higher the score, the greater the severity of the attack. We calculated the difference between the PRAM score measured one hour post treatment and the PRAM score at baseline (PRAM score 1 hour - PRAM score baseline). The larger the absolute value of the difference, the better the outcome (e.g., a difference of -4 indicates a better outcome that a difference of -2). minimum value of the difference (Albuterol - Higher Dose, experimental group): -8 maximum value of the difference (Albuterol - Higher Dose, experimental group): 0 minimum value of the difference (Albuterol - Lower Dose, control group): -8 maximum value of the difference (Albuterol - Lower Dose, control group): 0
Time frame: One hour post-treatment
Albuterol Determination in the Plasma
Albuterol determination in the plasma was carried out at at discharge or hospital admission (up to 4 hours post treatment), dosage was accomplished by High Performance Liquid Chromatography.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment)
Changes in Glucose Serum Levels
Changes in glucose serum levels at discharge or hospital admission (up to 4 hours post treatment) in comparison with baseline.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment) in comparison with baseline.
Electrocardiogram at Baseline
Electrocardiogram performed at baseline
Time frame: at baseline
Changes in Respiratory Rate After One Hour
Change in respiratory rate one hour post-treatment in comparison with baseline.
Time frame: One hour post-treatment in comparison with baseline
Need for Additional Therapies
The need for additional therapies such as magnesium sulphate or intravenous albuterol were recorded
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment)
Changes in PRAM Score at Discharge or Hospital Admission
Change in the Pediatric Respiratory Assessment Measure (PRAM) score at discharge or hospital admission (up to 4 hours post treatment) in comparison with baseline. The PRAM score is used to assess the severity of asthma attacks, it ranges from 0 to 15, and the higher the score, the greater the severity of the attack. We calculated the difference between the PRAM score measured at discharge or admission and the PRAM score at baseline (PRAM score discharge or admission - PRAM score baseline). The larger the absolute value of the difference, the better the outcome (e.g., a difference of -4 indicates a better outcome that a difference of -2). minimum value of the difference (Albuterol - Higher Dose, experimental group): -9 maximum value of the difference (Albuterol - Higher Dose, experimental group): 0 minimum value of the difference (Albuterol - Lower Dose, control group): -9 maximum value of the difference (Albuterol - Lower Dose, control group): 1
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment) in comparison with baseline.
Changes in Potassium Serum Levels
Changes in potassium serum levels at discharge or hospital admission (up to 4 hours post treatment) in comparison with baseline.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment) in comparison with baseline.
Changes in Bicarbonate Serum Levels
Changes in bicarbonate serum levels at discharge or hospital admission (up to 4 hours post treatment) in comparison with baseline.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment) in comparison with baseline.
Changes in Respiratory Rate at at Discharge or Hospital Admission.
Changes in respiratory rate at discharge or hospital admission (up to 4 hours post treatment) in comparison with baseline.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment) in comparison with baseline.
Change in Pulse Oximetry One Hour Post-treatment
Change in pulse oximetry one hour post-treatment in comparison with baseline
Time frame: One hour post-treatment in comparison with baseline
Changes in Pulse Oximetry at Discharge or Hospital Admission.
Changes in pulse oximetry at discharge or hospital admission (up to 4 hours post treatment) in comparison with baseline.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment) in comparison with baseline.
Changes in Heart Rate After One Hour
Change in heart rate one hour post-treatment in comparison with baseline.
Time frame: One hour post-treatment in comparison with baseline
Changes in Heart Rate at Discharge or Hospital Admission
Changes in heart rate at discharge or hospital admission (up to 4 hours post treatment) in comparison with baseline.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment)
Electrocardiogram One Hour Post-treatment.
Electrocardiogram one hour post-treatment to identify possible rhythm disturbances.
Time frame: One hour post-treatment
Electrocardiogram at Discharge or Hospital Admission
Electrocardiogram at discharge or hospital admission to identify possible rhythm disturbances.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment)
Lengths of Stay in the Emergency Room
lengths of stay in the emergency room for discharged patients
Time frame: one to four hours
Admission Rates in Patients With and Without Any Virus Detected
Admission rates in patients with and without any of the following viruses detected by PCR in nasal lavage samples: Adenovirus; Bocavirus; Coronavirus; Enterovirus (Echovirus); Influenza (A H3N2, A H1N1/2009, B and C); Metapneumovirus (subtypes A and B); Parainfluenza 1, 2, 3 and 4 (subtypes A and B); Rhinovirus; Respiratory Syncytial Virus type A and Respiratory Syncytial Virus type B.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment)
Admission Rates in Patients With and Without Rhinovirus Detect
Admission rates in patients with and without rhinovirus detected by PCR in nasal lavage samples.
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment)
Admission Rates in Patients With the Arg16Gly Polymorphisms
Admission rates in patients with the Arg16Gly polymorphisms of the beta-2 adrenergic receptor (Arg16Gly, Arg16Arg and Gly16Gly genotypes).
Time frame: at discharge or admission (up to 4 hours post treatment, minimum 1 hour, maximum 4 hours post treatment)
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