Time trends in high blood pressure control and the use of antihypertensive medications in older adults: the Cardiovascular Health Study.
BACKGROUND
Control of high blood pressure (BP) in older adults is an important part of public health efforts at prevention.


OBJECTIVE
To assess recent time trends in the awareness, treatment, and control of high BP and in the use of medications to treat high BP.


METHODS
In the Cardiovascular Health Study, 5888 adults 65 years and older were recruited from 4 US centers. At baseline, participants underwent an extensive examination that included the measurement of BP, use of medications, and other risk factors. Participants were followed up with annual visits that assessed BP and medication use from baseline in 1989-1990 through the examination in 1998-1999. The primary outcome measures were control of BP to levels lower than than 140/90 mm Hg and the prevalence of use of various classes of antihypertensive medications.


RESULTS
The awareness, treatment, and control of high BP improved during the 1990s. The proportions aware and treated were higher among blacks than whites, though control prevalences were similar. For both groups combined, the control of high BP to lower than 140/90 mm Hg increased from 37% at baseline to 49% in 1999. The 51% whose BP was not controlled generally had isolated mild to moderate elevations in systolic BP. Among treated persons, the improvement in control was achieved in part by a mean increase of 0.2 antihypertensive medications per person over the course of 9 years. Improved control was also achieved by increasing the proportion of the entire Cardiovascular Health Study population that was treated for hypertension, from 34.5% in 1990 to 51.1% in 1999. Time trends in antihypertensive drug use were pronounced. Among those without coronary disease, the use of low-dose diuretics and beta-blockers decreased, while the use of newer agents, such as calcium channel blockers, angiotensin-converting enzyme inhibitors, and alpha-blockers increased.


CONCLUSIONS
While control of high BP improved in the 1990s, about half the participants with hypertension had uncontrolled BP, primarily mild to moderate elevations in systolic BP. Low-dose diuretics and beta-blockers--the preferred agents since 1993 according to the recommendations of the Joint National Committee on the Detection, Evaluation and Treatment of High Blood Pressure--remained underused. More widespread use of these agents will be an important intervention to prevent the devastating complications of hypertension, including stroke, myocardial infarction, and heart failure.
Psaty
Bruce M
BM
Cardiovascular Health Research Unit, Department of Medicine, University of Washington, 1730 Minor Ave, Suite 1360, Seattle, WA 98101, USA.
Manolio
Teri A
TA
Smith
Nicholas L
NL
Heckbert
Susan R
SR
Gottdiener
John S
JS
Burke
Gregory L
GL
Weissfeld
Joel
J
Enright
Paul
P
Lumley
Thomas
T
Powe
Neil
N
Furberg
Curt D
CD
D000367:Age Factors; D000368:Aged; D000959:Antihypertensive Agents / Q000627:therapeutic use*; D001364:Awareness; D015331:Cohort Studies; D004358:Drug Therapy / Q000639:trends*; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D006973:Hypertension / Q000188:drug therapy* / Q000517:prevention & control*; D008297:Male; D011446:Prospective Studies; D013997:Time Factors
D000959:Antihypertensive Agents