The relationship of ambulatory blood pressure load with head-up tilt test results in children

Objective To explore the relationship of ambulatory blood pressure load with head-up tilt test (HUTT) results in children. Methods A total of 311 children (153 males, 158 females, age 3~17 years old) of unexplained syncope or pre-syncope were enrolled in this study, who came from children syncope outpatient department or inpatient department of the Second Xiangya Hospital of Central South University during Aug 2008 to Feb 2013.HUTT and 24 h ambulatory blood pressure were checked.The children were devided into <10% group and≥10% group according to the blood pressure load. Results There were no statistical differences in the blood pressure load 0.05], 24-hour mean diastolic pressure load [65.37%(168/257) vs 53.70%(29/54), χ2=2.607, P>0.05], daytime mean systolic pressure load [65.48%(165/252) vs 54.24%(32/59), χ2=2.592, P>0.05], daytime mean diastolic pressure load [64.04%(187/292) vs 52.63%(10/19), χ2=0.997, P>0.05], nighttime mean systolic pressure load [66.30%(122/184) vs 59.05%(75/127), χ2=1.234, P>0.05], nighttime mean diastolic pressure load [64.35%(148/230) vs 60.49%(49/81), χ2=0.382, P>0.05]. There was also no statistical difference in the blood pressure load 0.05). The HUTT results as the dependent variable, the blood pressure load as the independent variable, it was not fitting a linear regression equation. Conclusion Blood pressure load on the HUTT result has no predictive value in children. Key words: Blood pressure load; Head-up tilt test; Children