Relationship among mental stress-induced ischemia and ischemia during daily life and during exercise: The psychophysiologic investigations of myocardial ischemia (PIMI) study
Ph. Stone et al., Relationship among mental stress-induced ischemia and ischemia during daily life and during exercise: The psychophysiologic investigations of myocardial ischemia (PIMI) study, J AM COL C, 33(6), 1999, pp. 1476-1484
Citations number
38
Categorie Soggetti
Cardiovascular & Respiratory Systems","Cardiovascular & Hematology Research
OBJECTIVES
The purposes of this database study were to determine: 1) the relationship
between mental stress-induced ischemia and ischemia during daily life and d
uring exercise; 2) whether patients who exhibited daily life ischemia exper
ienced greater hemodynamic and catecholamine responses to mental or physica
l stress than patients who did not exhibit daily life ischemia, and 3) whet
her patients who experienced daily life ischemia could be identified on :th
e basis of laboratory-induced ischemia using mental or exercise stress test
ing.
BACKGROUND
The relationships between mental stress-induced ischemia in the laboratory
and ischemia during daily life and during exercise are unclear.
METHODS
One hundred ninety-six stable patients with documented coronary disease and
a positive exercise test underwent mental stress testing and bicycle exerc
ise testing. Radionuclide ventriculography and electrocardiographic (ECC) w
ere performed during the mental stress and bicycle tests. Patients underwen
t 48 h of ambulatory ECC monitoring Hemodynamic and catecholamine responses
were obtained during mental stress and bicycle tests.
RESULTS
Ischemia (reversible left ventricular dysfunction or ST segment depression
greater than or equal to 1 mm) developed in 106 of 183 patients (58%) durin
g the mental stress test. There were no significant differences in clinical
characteristics of patients with, compared with those without, mental stre
ss-induced ischemia. Patients with mental stress ischemia more often had da
ily Life ischemia than patients without mental stress ischemia, but their e
xercise tests were similar. Patients with daily life ischemia had higher ej
ection fraction and cardiac output, and lower systemic vascular resistance
during mental stress than patients without daily life ischemia. Blood press
ure and catecholamine levels at rest and during the mental stress tests wer
e not different in patients with, compared with those without, daily life i
schemia. Patients with daily life ischemia had a higher ejection fraction a
t rest and at peak bicycle exercise compared with patients without daily li
fe ischemia, but were were no other differences in peak hemodynamic or cate
cholamine responses to exercise. The presence of ST segment depression duri
ng routine daily activities was best predicted by ST segment depression dur
ing mental or bicycle exercise stress, although ST segment depression was r
are during mental stress.
CONCLUSIONS
Patients with daily life ischemia exhibit a heightened generalized response
to mental stress. ST segment depression in response to mental or exercise
stress is more predictive of ST segment depression during routine daily act
ivities than other laboratory-based ischemic maskers. Therapeutic managemen
t strategies might therefore focus on patients with these physiologic respo
nses to stress and on whether lessening such responses reduces ischemia. (C
) 1999 by the American College of Cardiology.