The accuracies of pulse wave and oscillometric electronic sphygmomanometers for blood pressure measurements in obese people
XU Hai*, HOU Lei, ZUO Hui-juan, WANG Qin-fu, QIN Fang,
CHEN Xiao-rong, ZHANG Ji-yu, WANG Zeng-wu, MA Ji-xiang
*Department of Cardiovascular and Ce『ebrovascular, National Center for Chronic and Noncommunicable
Disease Control and prevention.Chinese Center for Disease Control and Prevention, Beijing 100050, China
Abstract: Objective To evaluate the accuracies of pulse wave and oscillometric electronic sphygmomanometers for blood pressure measurements in obese people.
Methods Community-based men and women, aged18 years whose body mass index(BMI) were 30 kg/m² more were recruited in Laiwu city, Shangdong province in September 2015. A four-way pipe was used to link the desktop mercury sphygmomanometer, electronic sphygmomanometer to subjects simultaneously. The blood p『essure value recorded by the desktop mercury sphygmomanometer was considered as a golden standard. Intra class correlation coefficient (ICC), Bland-Altman method, and allowable total error(ATE/limits for erroneous results zones(LER)zones were used for evaluating the accuracy of two electronic sphygmomanometers compared to mercuries sphygmomanometer.
Results A total of 118 subjects were enrolled. The ICC of pulse wave electronic sphygmomanometer-desktop mercury sphygmomanometer were 0.99(95% Cl 0.99~1.00)for systolic blood pressures and 0.96 (95% Cl 0.90~0.98) for diastolic blood pressures. The ICC of oscillometric electronic sphygmomanometer-desktop mercury sphygmomanometer were 0.98 (95% Cl 0.97~0.99) fo『 systolic blood pressures and 0.90 (95% Cl 0.44~0.96) for diastolic blood pressures. Bland-Altman test showed that the mean systolic blood pressure difference closed to zero reference line, while the mean diastolic blood pressure difference was below the zero-『eference line.especially in oscillometric sphygmomanometer (-5.7 vs -2.6 mmHg, P<0.05).ATE/LER zones analysis showed that more than 95% values for systolic blood pressu『es in two sphygmomanometers fell within the ATE zones. For diastolic blood pressure values in pulse wave electronic sphygmomanometer,4.2%, and 0% measured values fell within the inte『mediate zones and LER zones respectively the corresponding proportions in oscillometric electronic sphygmomanometer were 19.5% and 0.8%.
Conclusion: This study indicated that both pulse wave and oscillometric electronic sphygmomanometer have good accuracies in systolic blood pressure measurement.however.underestimated diastolic blood pressure.particularly in oscillometric electronic sphygmomanometer in obese people.
Keywords: sphygmomanometers; blood pressure measurement; accuracy
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