Reference ranges• Based on unpublished data • 52 aged 2-11 from 500 healthy subjects in rural Australian community • 32 aged 12-16
Previous workResuscitation 2010;81:1105-1110First presented as an abstract at ACEM 2009, Busan, Korea
Objectives1. To derive reference ranges for heart rate (HR), cardiac output and index (CO, CI), stroke volume and index (SV, SVI) and systemic vascular resistance and index (SVR, SVRI) in Chinese adolescents in Hong Kong using USCOM.2. To compare these ranges with those from Australia.
Subjects 4 schools 590 subjects (49% male) Mean age (SD): 15.7 (2.1) years
MeasurementsHeight and weight Blood pressure USCOM
Australian Comparison Australian Chinese p (n=32) (n=360) Stroke Volume Index 54 52.6 (ml.m-2) 0.37 (7) (10.8) Cardiac Index 4.1 4.2 (l.min-1.m-2) 0.62 (0.5) (1.1) SVRI 1748 1685 (d.s.cm-5.m2) 0.10 (324) (634)Subjects aged 12-16 years old Means (sd), t-test
Other results• There was poor correlation between age and cardiovascular parameters.• SV correlated weakly with weight and height, and was significantly higher in boys than in girls.• In the group of 12-18 year olds, parameters were normally distributed.• Inter-observer reliability of USCOM measurements was very good.
Conclusion• This is the only study to derive reference ranges for cardiovascular indices for Chinese adolescents, and the largest such study in any population.• We hope that the use of these values will improve the diagnosis, treatment, management and monitoring of adolescent patients in emergency departments.
Thanks to… The staff and children from participating schools in Shatin