[Estimation of myocardial ischemia by diastolic strain analysis in exercise stress echocardiography: comparison with exercise thallium-201 single photon emission computed tomography].

Abstract:

OBJECTIVES:The feasibility of detecting persistent regional left ventricular abnormal relaxation due to myocardial ischemia using strain echocardiography several minutes after exercise was investigated. METHODS:Consecutive 27 patients (mean age 65 +/- 9 years, 21 males, 6 females) with suspected coronary artery disease were enrolled. Strain echocardiographic images were acquired at the mid segments of the left ventricular wall before and 5 min after exercise in the apical long-axis, two-chamber and four-chamber views. Strain curves were obtained at each segment, and peak values of strain at the closure of aortic valve (A) and at one third of diastolic duration (B) were measured. Strain diastolic index (SDI) was calculated as (A - B)/A X 100%. The ratio of SDI before exercise to that after exercise was defined as the SDI ratio and compared with exercise thallium-201 single photon emission computed tomography (SPECT) as the reference standard to detect myocardial ischemia. RESULTS:A total of 162 segments were evaluated. Based on the results of exercise SPECT, 119 segments were classified as non-ischemic segments, and 43 as ischemic segments. Ischemic segments showed significant decreases in SDI before and after exercise, whereas non-ischemic segments showed no significant differences in SDI before and after exercise. SDI ratio was significantly decreased in ischemic segments, but not in non-ischemic segments. SDI ratio with a cut off value of 0.51 had a sensitivity of 91% and a specificity of 89% to detect myocardial ischemia in the receiver-operating characteristics. Conclusions. Strain echocardiography can provide quantitative assessment of myocardial ischemia by detecting post-ischemic regional left ventricular delayed relaxation even 5 min after exercise.

journal_name

J Cardiol

journal_title

Journal of cardiology

authors

Zhu H,Hozumi T,Takemoto Y,Takagi Y,Negishi K,Abo K,Sugioka K,Matsumura Y,Otsuka R,Yoshitani H,Nakao M,Yoshiyama M,Yoshikawa J

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

165-72

issue

4

eissn

0914-5087

issn

1876-4738

journal_volume

47

pub_type

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