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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
Self-measured home blood pressure in predicting ambulatory hypertension.
American Journal of Hypertension 2004 November
BACKGROUND: Physicians are commonly uncertain whether a person with office blood pressure (BP) around 140/90 mm Hg actually has hypertension. This is primarily because of BP variability. One approach is to perform self-measured home BP and determine if home BP is elevated. There is a general agreement that if home BP is >/=135/85 mm Hg, then antihypertensive therapy may be commenced. However, some persons with home BP below this cut-off will have ambulatory hypertension. We therefore prospectively study the role of home BP in predicting ambulatory hypertension in persons with stage 1 and borderline hypertension.
METHODS: We studied in a cross-sectional way home and ambulatory BP in a group of 48 patients with at least two elevated office BP readings. The group was free of antihypertensive drug therapy for at least 4 weeks and performed 7 days of standardized self-BP measurements at home. We examined the relationships of the three BP methods and also defined a threshold (using receiver operating curves) for home BP that captures 80% of ambulatory hypertensives (awake BP >/=135/85 mm Hg).
RESULTS: Office systolic BP (145 +/- 13 mm Hg) was significantly higher than awake (139 +/- 12 mm Hg, P = .013) and home (132 +/- 11 mm Hg, P < .001) BP. Office diastolic BP (88 +/- 4 mm Hg) was higher than home diastolic BP (80 +/- 8 mm Hg, P < .001) but not different from awake diastolic BP (88 +/- 8 mm Hg, P = .10). Home BP had a higher correlation (compared with office BP) with ambulatory BP. The home BP-based white coat effect correlated with ambulatory BP-based white coat effect (r = 0.83, P = .001 for systolic BP; r = 0.68, P = .001 for diastolic BP). The threshold for home BP of 80% sensitivity in capturing ambulatory hypertension was 125/76 mm Hg.
CONCLUSIONS: Our preliminary data suggest that a lower self-monitored home BP threshold should be used (to exclude ambulatory hypertension) in patients with borderline office hypertension.
METHODS: We studied in a cross-sectional way home and ambulatory BP in a group of 48 patients with at least two elevated office BP readings. The group was free of antihypertensive drug therapy for at least 4 weeks and performed 7 days of standardized self-BP measurements at home. We examined the relationships of the three BP methods and also defined a threshold (using receiver operating curves) for home BP that captures 80% of ambulatory hypertensives (awake BP >/=135/85 mm Hg).
RESULTS: Office systolic BP (145 +/- 13 mm Hg) was significantly higher than awake (139 +/- 12 mm Hg, P = .013) and home (132 +/- 11 mm Hg, P < .001) BP. Office diastolic BP (88 +/- 4 mm Hg) was higher than home diastolic BP (80 +/- 8 mm Hg, P < .001) but not different from awake diastolic BP (88 +/- 8 mm Hg, P = .10). Home BP had a higher correlation (compared with office BP) with ambulatory BP. The home BP-based white coat effect correlated with ambulatory BP-based white coat effect (r = 0.83, P = .001 for systolic BP; r = 0.68, P = .001 for diastolic BP). The threshold for home BP of 80% sensitivity in capturing ambulatory hypertension was 125/76 mm Hg.
CONCLUSIONS: Our preliminary data suggest that a lower self-monitored home BP threshold should be used (to exclude ambulatory hypertension) in patients with borderline office hypertension.
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