Mental Stress Provokes Ischemia in Coronary Artery Disease Subjects Without Exercise- or Adenosine-Induced Ischemia

Mental Stress Provokes Ischemia in Coronary Artery Disease Subjects Without Exercise- or Adenosine-Induced Ischemia Srikanth Ramachandruni, Roger B. Fillingim, Susan P. McGorray, Carsten M. Schmalfuss, Gary R. Cooper, Richard S. Schofield, David S. Sheps Mental stress-induced ischemia has been reported in 20% to 70% of coronary artery disease subjects with exercise-induced ischemia, but little is known about mental stress-induced ischemia in coronary artery disease subjects who have no inducible ischemia with exercise or pharmacologic test results. In this study, 21 subjects with coronary artery disease completed a speaking task involving role playing a difficult situation. A total of 30 mCi 99mTc-sestamibi was injected 1 min into the speech, and imaging was started 40 min later. Stress and resting images were analyzed for perfusion defects. Six of 21 (29%) subjects demonstrated reversible ischemia with mental stress. The purpose of this study was to investigate the possibility that some patients with coronary artery disease (CAD) but negative exercise or chemical stress test results might have mental stress-induced ischemia. The study population consisted solely of those with negative test results. Mental stress-induced ischemia has been reported in 20% to 70% of CAD subjects with exercise-induced ischemia. Because mechanisms of exercise and mental stress-induced ischemia may differ, we studied whether mental stress would produce ischemia in a proportion of subjects with CAD who have no inducible ischemia with exercise or pharmacologic tests. Twenty-one subjects (14 men, 7 women) with a mean age of 67 years and with a documented history of CAD were studied. All subjects had a recent negative nuclear stress test result (exercise or chemical). Subjects completed a speaking task involving role playing a difficult interpersonal situation. A total of 30 mCi 99mTc-sestamibi was injected at one minute into the speech, and imaging was started 40 min later. A resting image obtained within one week was compared with the stress image. Images were analyzed for number and severity of perfusion defects. The summed difference score based on the difference between summed stress and rest scores was calculated. Severity was assessed using a semiquantitative scoring method from zero to four. Six of 21 (29%) subjects demonstrated reversible ischemia (summed difference score ≥3) with mental stress. No subject had chest pain or electrocardiographic changes during the stressor.