Discrepancy among three blood pressure readings within one measurement and relevant influencing factors

作者：Su, Hai^*; Wang, Jiwei; Zhu, Yanhua; Wang, Guangfu; Cheng, Xiaoshu

来源：Blood Pressure Monitoring, 2010, 15(3): 152-157.

DOI：10.1097/MBP.0b013e328337cea6

• aging
• blood pressure
• discrepancy
• measurement
• sex

Objective To investigate the discrepancy in three blood pressure (BP) readings within one measurement and the relevant influencing factors.
Methods BP was measured by senior experienced physicians three times at 2-min intervals in 2087 adults (1025 male and 1062 female) with a calibrated mercurial sphygmomanometer. According to the history of hypertension and use of antihypertensive drugs, the participants were divided into hypertensive (EH group, 496 cases, 365 on antihypertensive therapy and 131 not on therapy) and normotensive groups (NT group). The average of three BP readings was used as the basic BP. The discrepancy in systolic BP (DSBP) and diastolic BP (DDBP) was the difference between the maximal and the minimal SBP and DBP of three readings respectively. The ratios of DSBP/SBP and DDBP/DBP were calculated from DBP and the basic BP respectively.
Results The DSBP of more than 10 mmHg occurred in 19.9% of the population and DDBP of more than 5 mmHg in 32.3% of the population. Rank correlation showed a positive relationship between the basic SBP and DSBP (r = 0.109, P = 0.001), but no relationship was found between basic SBP and DSBP/SBP. Although the SBP and DSBP were higher in the EH group than in the NT group, no significant difference of DSBP/SBP was found between the EH group and the NT group. A positive relationship between age rank and DSBP (r = 0.124, P < 0.01) and between age rank and DSBP/SBP (r = 0.151, P < 0.01) existed in the whole population before elderly. Meanwhile, a stronger relationship between age rank and DSBP/SBP was found in females (r = 0.163) than in males (r = 0.146). Significantly higher DSBP and DSBP/SBP and DDBP and DDBP/DBP were found in females than in males at lower SBP and DBP levels.
Conclusion The discrepancy in the three BP readings within one measurement is quite large. High basic BP, female sex, and aging are facilitating factors for large SBP discrepancy. Female sex and aging are independent factors for large discrepancy in three BP readings.

• 出版日期2010-6
• 单位南昌大学