Pressor responses to laboratory stresses and daytime blood pressure variability.

Abstract:

:We studied 56 patients with essential hypertension to determine whether responses to standardized laboratory mental and physical challenges accurately reflect blood pressure variability during routine daily activities. Four activities were performed in the laboratory: mental arithmetic, a reaction time test, isometric exercise, and submaximal bicycle exercise. Blood pressure was measured directly from a brachial artery catheter. We then recorded intra-arterial ambulatory blood pressure away from hospital over 24 h. A frequency histogram was constructed from all cardiac cycles when subjects were awake. Variability of ambulatory blood pressure was defined as the standard deviation about the mean waking value. The increase in mean arterial pressure (MAP) during each of these four challenges correlated significantly with the variability of mean arterial pressure (highest correlation: reaction time test, r = 0.53, P less than 0.00001; lowest correlation: mental arithmetic, r = 0.26, P less than 0.03), and five subjects who were highly reactive to all four challenges also demonstrated increased blood pressure variability. We therefore conclude that these commonly used laboratory tests can give some information about the behaviour of blood pressure in daily life in some subjects, but overall the variance in blood pressure variability that can be accounted for by the pressor response to these standardized challenges is low.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Floras JS,Hassan MO,Jones JV,Sleight P

doi

10.1097/00004872-198712000-00014

subject

Has Abstract

pub_date

1987-12-01 00:00:00

pages

715-9

issue

6

eissn

0263-6352

issn

1473-5598

journal_volume

5

pub_type

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