Stress-induced Worsening of Left Ventricular Diastolic Function as a Marker of Myocardial Ischemia.

Background: Echocardiography has been the subject of interest in diagnosing diastolic dysfunction and estimating left ventricular filling pressures (LVFPs). The present study is set to estimate the correlation between the worsening of diastolic parameters and the evidence of inducible ischemia during an exercise stress echocardiography (SE) in comparison with the results of coronary computed tomographic angiogram (CCTA).

Methods: A total of 191 consecutive patients from the executive screening program who underwent exercise SE followed by CCTA were evaluated. Baseline demographics, heart rate, and blood pressure measurements were extracted for analysis. Standard two-dimensional and tissue Doppler imaging parameters were analyzed. Diastolic function was graded at rest and peak exercise.

Results: Patients who had worsening of diastolic function by at least one grade had had 2-3-fold higher odds of having abnormal SE. In addition, patients with worsening of diastolic function had higher stress LVFPs (E/e' = 11.7 ± 2.7 vs. E/e' 8.0 ± 2.0; < 0.0001), more E/e' change >25% (48% vs. 22%, = 0.012), and were more likely to have obstructive coronary artery disease (CAD) on CCTA (23.8% vs. 9.2%; = 0.045). A change in E/e' >25% (stress-rest) was highly associated with a positive stress test and abnormal CCTA result. Patients with no change or improvement in diastolic function with stress had a 92% negative predictive value of having normal SE and 91% of normal/nonobstructive CCTA.

Conclusion: A worsening of diastolic function and a change in E/e' >25% (stress-rest) were associated with abnormal SE, positive stress test, and obstructive CAD when compared to CCTA results.