Ambulatory blood pressure monitoring in a nonacademic setting. Effects of age and sex

Twenty-four-hour ambulatory blood pressure measurements (ABPM) are likely to eliminate the stress of visits and observer bias in office blood pressure (BP) recordings, allow consideration of the circadian variability in BP, and correlate well with target organ damage. To define the prevalence of &qu...

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Bibliographic Details
Published inAmerican journal of hypertension Vol. 5; no. 9; p. 616
Main Authors Khoury, S, Yarows, S A, O'Brien, T K, Sowers, J R
Format Journal Article
LanguageEnglish
Published United States 01.09.1992
Subjects
Age Factors
Aged
Ambulatory Care
Blood Pressure - physiology
Blood Pressure Determination - methods
Circadian Rhythm - physiology
Female
Humans
Hypertension - epidemiology
Hypertension - physiopathology
Male
Middle Aged
Primary Health Care
Retrospective Studies
Rural Health
Schools
Sex Factors
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Summary:Twenty-four-hour ambulatory blood pressure measurements (ABPM) are likely to eliminate the stress of visits and observer bias in office blood pressure (BP) recordings, allow consideration of the circadian variability in BP, and correlate well with target organ damage. To define the prevalence of "white coat" hypertension in a rural community to a nonacademic setting, and to assess age and sex related differences, we studied 131 patients who had more than two prior office diastolic BP measurements greater than 90 mm Hg and less than 115 mm Hg. Blood pressure was measured every 10 to 60 min for 24 h using the SpaceLabs 90207 device. Office BP readings were higher than ABPM in the group as a whole, in individual age groups, and in both sexes. The differences were more pronounced at night. Average differences between office and ambulatory BP ranged between 14.4 +/- 1.7/2.9 +/- 2.0 (ABPM at 10:00), and 33.8 +/- 2.3/22.8 +/- 1.5 mm Hg (systolic/diastolic +/- SE) (ABPM at 01:00). The nighttime drop in systolic BP was not apparent in subjects more than 65 years old. Women had a proportionately higher mean office BP than men (115.0 +/- 0.9 office v 110.2 +/- 1.3 mm Hg ABPM in women and 112.3 +/- 0.9 v 104.3 +/- 1.1 mm Hg in men) (P = .013), and the elderly did not display the relationship between ambulatory and office mean BP seen in younger subjects (r = 0.15, P = .30 v r = 0.36, P = .0004, respectively).
ISSN:0895-7061
DOI:10.1093/ajh/5.9.616