Usefulness of an exaggerated systolic blood pressure response to exercise in predicting myocardial perfusion defects in known or suspected coronary artery disease
L. Campbell et al., Usefulness of an exaggerated systolic blood pressure response to exercise in predicting myocardial perfusion defects in known or suspected coronary artery disease, AM J CARD, 84(11), 1999, pp. 1304-1310
Citations number
27
Categorie Soggetti
Cardiovascular & Respiratory Systems","Cardiovascular & Hematology Research
The clinical importance of an exaggerated systolic blood pressure (BP) resp
onse to exercise, or exercise hypertension, is unclear. We have previously
reported that exercise hypertension is associated with less severe angiogra
phic coronary artery disease. This study sought to examine the association
between exercise hypertension and ischemic "burden," as assessed by thalliu
m-201 single-photon emission computed tomography. The cohort was comprised
of consecutive adults (2,216 men, 1,229 women) referred for symptom-limited
exercise thallium testing to evaluate known or suspected coronary artery d
isease. The main variable measured was exercise hypertension, defined as a
peak systolic BP greater than or equal to 210 mm Hg in men and greater than
or equal to 190 mm Hg in women. Thallium perfusion defects were described
as: (1) any perfusion abnormality, (2) reversible abnormalities, and (3) an
y abnormality in greater than or equal to 3 of 12 myocardial segments ("ext
ensive abnormalities"). Exercise hypertension was present in 1,319 subjects
(39%). Patients with exercise hypertension were less likely to have any th
allium perfusion abnormality (16% vs 25%, odds ratio [OR] 0.58, 95% confide
nce intervals [CI] 0.49 to 0.69, p <0.001), reversible thallium abnormaliti
es (7% vs 12%, OR 0.71, 95% CI 0.57 to 0.90, p <0.001), and extensive abnor
malities (8% vs 14%, OR 0.53, 95% CI 0.42 to 0.67, p <0.001). After adjusti
ng for possible confounders, the same trend was seen. During 6 years of fol
low-up there were 283 deaths with no association between exercise hypertens
ion and mortality risk. Thus, exercise hypertension is associated with a lo
wer likelihood of myocardial perfusion abnormalities and is not associated
with an increased mortality rate. (C) 1999 by Excerpta Medica, Inc.