Related Experiment Videos
The pharmacokinetics of isoproterenol in critically ill pediatric patients
G Reyes1, P H Schwartz, C J Newth
1Pediatric ICU Research Laboratory, Childrens Hospital Los Angeles, University of Southern California School of Medicine 90027.
Insights
This study reports the pharmacokinetics of isoproterenol (ISO) in pediatric intensive care patients. Postoperative cardiac patients showed higher ISO concentrations and lower clearance than reactive airway disease patients.
Area of Science:
- Pediatric Pharmacology
- Clinical Pharmacokinetics
- Critical Care Medicine
Background:
- Pharmacokinetics of isoproterenol (ISO) in pediatric populations are not well-documented.
- Understanding ISO pharmacokinetics is crucial for optimizing treatment in critically ill infants and children.
Purpose of the Study:
- To characterize the pharmacokinetics of isoproterenol in two distinct groups of pediatric intensive care unit patients: postoperative cardiac (POC) and reactive airway disease (RAD).
- To compare ISO dosing rates, plasma concentrations, clearance, half-life, and volume of distribution between POC and RAD patients.
Main Methods:
- Pharmacokinetic analysis of isoproterenol in 19 pediatric intensive care unit patients (10 POC, 9 RAD).
- Blood samples collected at steady-state and during infusion discontinuation.
- Analysis included dosing rates, plasma concentrations, clearance, half-life, and volume of distribution.
Main Results:
- POC patients received significantly lower ISO dosing rates and had lower steady-state plasma concentrations compared to RAD patients.
- Normalized steady-state plasma concentrations were higher in POC patients, while clearance was moderately lower.
- Average ISO plasma half-life was 4.2 ± 1.5 minutes, and volume of distribution was 216 ± 57 mg/kg.
Conclusions:
- Significant differences in isoproterenol pharmacokinetics exist between postoperative cardiac and reactive airway disease pediatric patients.
- Findings suggest potential for altered drug response and necessitate individualized dosing strategies in these pediatric populations.
- Further research is warranted to elucidate the clinical implications of these pharmacokinetic variations.
Abstract:
The pharmacokinetics of isoproterenol (ISO) in infants and children have never been reported. The authors studied ISO pharmacokinetics in two disparate groups of pediatric intensive care unit patients: postoperative cardiac patients (POC, n = 10), and reactive airway disease patients (RAD, n = 9). In all, 44 blood samples were taken at steady-state from the 19 patients, whereas from 15 patients samples were also taken just before and after discontinuation of ISO infusion. There were 12 male and 7 female patients in the study, and their ages ranged from 2 days to 14 years. The average ISO dosing rate was 0.30 micrograms/kg/minute for the whole study population, ranging from 0.01 to 5.5 micrograms/kg/minute. The POC patients received a significantly lower dosing rate than the RAD patients (0.029 +/- 0.002 vs 0.50 +/- 0.21 micrograms/kg/minute, P < .0001); the average steady-state plasma concentrations of ISO were also lower in the POC patients (1.3 +/- 0.3 versus 13.9 +/- 4.9 ng/mL, P < .0001). The steady-state plasma concentration, normalized to a dosing rate of .05 micrograms/kg/minute, was 1.9 +/- 0.3 ng/mL for all patients, and the clearance was 42.5 +/- 5.0 mg/kg/minute. Postoperative cardiac patients had a significant higher normalized steady-state plasma concentration and moderately significant lower clearance than did RAD patients (2.1 +/- 0.3 versus 1.7 +/- 0.4 ng/mL, P < .05 and 33.2 +/- 4.9 versus 48.4 +/- 7.3, P < .06, respectively). The average plasma half-life of ISO was 4.2 +/- 1.5 minutes, and the volume of distribution was 216 +/- 57 mg/kg.(ABSTRACT TRUNCATED AT 250 WORDS)