Objectives: The aim of this study was to compare the usefulness and credibility of ambulatory self-measurement of blood pressure (SMBP) by hypertensive patients to automatic ambulatory blood pressure monitoring (ABPM).
Methods: The study was performed in 51 patients with primary hypertension (19 F, 32 M), aged 25-67 y divided into 3 groups: I-without treatment (n = 13), II-receiving monotherapy (n = 17) and III-treated at least with 2 hypotensive drugs (n = 21). For three consecutive days, patients measured their systolic blood pressure (SBP), diastolic blood pressure (DBP) and heart rate (HR) three times a day at 2 minute intervals during the following periods 06:00-08:00, 15:00-17:00 and 20:00-22:00. Afterwards, the process was repeated for three days using the automatic OMRON HEM-705C device. Results obtained on the second and third days were included in the calculation of SBP, DBP and HR mean values for the period 06:00-22:00. On the fourth day of the study, ABPM was performed with a Tycos Quiet Trak recorder. The parameters were measured every 20 minutes between 06:00 and 22:00. The average values for SBP, DBP and HR that were obtained with these two methods of blood pressure monitoring using the time period 06:00-22:00, were then compared.
Results: There was a significant correlation between SMBP and ABPM for SBP, DBP and HR in groups I, II and III (for SBP r = 0.81; 0.80; 0.82; for DBP r = 0.61; 0.62; 0.83; for HR r = 0.53; 0.69; 00.81). According to statistical tests, significant differences in the mean values of SBP, DBP and HR were found in the first (3.9 mmHg, 5.7 mmHg and 8 min-1 and second (4.9 mmHg, 6.2 mmHg and 6.2 min-1) groups. Only the HR (7.7 min-1) was statistically significant in the third group.
Conclusions: Self-measurement of BP with automatic device is comparable to ABPM method of blood pressure monitoring, especially if multi-drug therapy is used for sustained hypertension. However, SMBP is not a completely alternative method for ABPM.
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