Prognostic significance of incorporating exercise tissue doppler mitral annular early diastolic velocity in exercise diastolic dysfunction assessment.

BACKGROUND: The existing algorithm for defining exercise-induced diastolic dysfunction incorporates resting e' velocity as a surrogate of myocardial relaxation. The additive prognostic value of incorporating post-exercise e' velocity in definition of exercise-induced diastolic dysfunction is poorly studied. AIM: To define the additive prognostic value of post-exercise e' septal velocity in the assessment of exercise-induced diastolic dysfunction compared to the traditional approach. METHODS: This retrospective study included 1409 patients undergoing exercise treadmill echocardiography with available full set of diastolic variables. Doppler measures of diastolic function included resting septal e' velocity, post-exercise septal e' velocity, post-exercise E/e' ratio, and post-exercise tricuspid regurgitant jet velocity. Approaches incorporating resting septal e' velocity and post-exercise septal e' velocity were compared in defining exercise-induced diastolic dysfunction, and for association with adverse cardiovascular outcomes. RESULTS: The mean age of study subjects was 56.3 ± 16.5 years and 791 (56%) patients were women. A total of 524 patients had disagreement between resting and post exercise septal e' velocities, and these values showed only weak agreement (kappa statistics: .28, P = .02). All categories of the traditional exercise-induced DD approach incorporating resting septal e' velocity witnessed reclassification when exercise septal e' velocity was used. When both approaches were compared, increased event rates were only evident when both approaches agreed on exercise-induced diastolic dysfunction (HR: 1.92, P < .001, 95% CI: 1.37-2.69). This association persisted after multivariable adjustment and propensity score matching for covariates. CONCLUSION: Incorporation of post-exercise e' velocity into the set of variables defining exercise-induced diastolic dysfunction can improve the prognostic utility of diastolic function assessment.

Prognostic significance of exercise stress echocardiography using two and three diastolic variable approaches.

BACKGROUND: The prognostic utility of comprehensive, guideline-defined assessment of diastolic measures during routine exercise echocardiography remains unclear. OBJECTIVES: The purpose of the study was to pragmatically assess the prognostic role of obtainable Doppler-derived diastolic variables during treadmill exercise echocardiography. METHODS: In this retrospective study, the authors included 1910 patients undergoing exercise echocardiography. The guideline-defined diastolic measures included resting septal e' velocity, post-exercise E/e' ratio and post-exercise tricuspid regurgitant jet velocity. Since tricuspid regurgitant jet velocity is not routinely obtainable, the authors examined 2 approaches: 2 variable approach using only resting septal e' velocity and post-exercise E/e' ratio and 3 variable approach with all diastolic variables. RESULTS: The mean age of study subjects was 57.6 ± 16 years and 1068 (56 %) were women. The tricuspid jet velocity was not reliably obtained in 501(26 %) of patients. All 3 diastolic variables were associated with the hard outcomes (mortality, acute coronary syndrome, cardiac hospitalization), soft outcomes (subsequent revascularization and cardiac testing), as well as the composite outcome. In the 2-variable approach, the presence of 2 abnormal variables was associated with a worse composite outcome. In the 3 variable approach, the presence of 2 or 3 abnormal variables was associated with a worse composite outcome. The associations persisted after multivariable adjustment and in the propensity matched subgroups. CONCLUSIONS: Guideline-defined diastolic variables during treadmill exercise echocardiography offer prognostic utility when used in combination, especially if all 3 variables are obtainable.