RT Journal Article
SR Electronic
T1 Thirty-minute compared to standardised office blood pressure measurement in general practice
JF British Journal of General Practice
JO Br J Gen Pract
FD British Journal of General Practice
SP e590
OP e597
DO 10.3399/bjgp11X593875
VO 61
IS 590
A1 Nynke Scherpbier-de Haan
A1 Mark van der Wel
A1 Gijs Schoenmakers
A1 Steve Boudewijns
A1 Petronella Peer
A1 Chris van Weel
A1 Theo Thien
A1 Carel Bakx
YR 2011
UL http://bjgp.org/content/61/590/e590.abstract
AB Background Although blood pressure measurement is one of the most frequently performed measurements in clinical practice, there are concerns about its reliability. Serial, automated oscillometric blood pressure measurement has the potential to reduce measurement bias and white-coat effect'Aim To study agreement of 30-minute office blood pressure measurement (OBPM) with standardised OBPM, and to compare repeatabilityDesign and setting Method comparison study in two general practices in the NetherlandsMethod Thirty-minute and standardised OBPM was carried out with the same, validated device in 83 adult patients, and the procedure was repeated after 2 weeks. During 30-minute OBPM, blood pressure was measured automatically every 3 minutes, with the patient in a sitting position, alone in a quiet room. Agreement between 30-minute and standardised OBPM was assessed by Bland–Altman analysis. Repeatability of the blood pressure measurement methods after 2 weeks was expressed as the mean difference in combination with the standard deviation of difference (SDD)Results Mean 30-minute OBPM readings were 7.6/2.5 mmHg (95% confidence interval [CI] = 6.1 to 9.1/1.5 to 3.4 mmHg) lower than standardised OBPM readings. The mean difference and SDD between repeated 30-minute OBPMs (mean difference = 3/1 mmHg, 95% CI = 1 to 5/0 to 2 mmHg; SDD 9.5/5.3 mmHg) were lower than those of standardised OBPMs (mean difference = 6/2 mmHg, 95% CI = 4 to 8/1 to 4 mmHg; SDD 10.9/6.3 mmHg).Conclusion Thirty-minute OBPM resulted in lower readings than standardised OBPM and had a better repeatability. These results suggest that 30-minute OBPM better reflects the patient's true blood pressure than standardised OBPM does.