A flow-limiting stenosis is the major determinant of exercise-induced myocardial stunning in patients with coronary artery disease.
BACKGROUND
Although stress-induced myocardial stunning often develops after exercise testing, determinants of this phenomenon have not been evaluated.


RESULTS
Thirty-one patients with 1-vessel coronary artery disease, limited to the left anterior descending artery (LAD), were evaluated by quantitative coronary angiography (QCA) and intracoronary pressure measurements to calculate fractional flow reserve (FFR). In addition, electrocardiogram-gated technetium-99m sestamibi myocardial imaging was acquired >30 min after exercise and 4 h later to assess the development of stunning. Exercise-induced myocardial stunning was observed in 11 patients (35%). In patients with myocardial stunning, a summed stress score (17.3+/-7.1 vs. 8.1+/-6.2, p<0.001), summed difference score (10.3+/-4.1 vs. 2.7+/-1.9, p<0.0001), and wall motion difference score (4.8+/-2.8 vs. 0.9+/-1.1, p<0.0001) were greater than in those without, while diameter stenosis calculated by QCA (55.1+/-17.3% vs. 29.8+/-17.3%, p<0.0001) was greater and FFR reduced significantly (0.54+/-0.13 vs. 0.83+/-0.06, p<0.0001). Of note, 4 out of 21 patients (19%) with <50% LAD stenosis developed myocardial stunning, whereas only one patient with FFR of 0.64 or greater showed stunning. The best cut-off value was determined as 0.64 for FFR and 46% for QCA, providing 91% sensitivity and 100% specificity for FFR (chi-square=57.2), but 91% sensitivity and 80% specificity for diameter stenoses measured by QCA (chi-square=17.8).


CONCLUSIONS
The major determinant for exercise-induced myocardial stunning was a severe flow-limiting coronary stenosis, which was more important than anatomical evaluation based on luminal narrowing alone.
Tanaka
Hirokazu
H
Department of Cardiology, Tokyo Medical University, 6-7-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo 160-0023, Japan. htanaka7@tokyo-med.ac.jp
Chikamori
Taishiro
T
Tanaka
Nobuhiro
N
Hida
Satoshi
S
Shindo
Naohisa
N
Igarashi
Yuko
Y
Yamashina
Akira
A
D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000150:complications*; D023921:Coronary Stenosis / Q000150:complications* / Q000503:physiopathology; D005080:Exercise Test; D006321:Heart / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D017682:Myocardial Stunning / Q000209:etiology*; D019275:Radiopharmaceuticals; D017256:Technetium Tc 99m Sestamibi; D015899:Tomography, Emission-Computed, Single-Photon
D019275:Radiopharmaceuticals; D017256:Technetium Tc 99m Sestamibi