Comparison of arm and calf automatic noninvasive blood pressures in pediatric intensive care patients

Area of Science:

• Pediatric critical care medicine
• Clinical physiology
• Biomedical engineering

Background:

• Accurate blood pressure (BP) monitoring is crucial in pediatric intensive care units (PICUs).
• Standard BP measurement sites in children may yield variable results.
• Limited data exists on comparing upper arm and calf BP measurements in critically ill children.

Purpose of the Study:

• To compare automatic upper arm and calf blood pressures (BPs) in children aged 1 to 8 years admitted to a PICU.
• To determine if upper arm and calf BP measurements are interchangeable in this pediatric population.

Main Methods:

• A convenience sample of 221 children (ages 1-8 years) in a PICU underwent simultaneous upper arm and calf BP measurements.
• Automated oscillometric devices were used with appropriate cuff sizes based on limb circumference.
• Subjects were positioned in bed with the head elevated 30°.

Main Results:

• Calf BPs were significantly higher than upper arm BPs in approximately 73% of the children.
• Paired t tests revealed statistically significant differences in systolic BPs and mean arterial pressures.
• The influence of demographics, agitation, diagnoses, and medications was explored but did not negate the observed differences.

Conclusions:

• Upper arm and calf automatic blood pressures are not interchangeable in acutely ill children aged 1 to 8 years.
• Calf BP measurements tend to overestimate BP compared to upper arm measurements in this population.
• Clinical guidelines should consider these differences when selecting BP measurement sites in pediatric critical care.