Segmental peak systolic strain rate during dobutamine stress echocardiography independently predicted mortality (HR 3.6; 95% CI 1.7-7.2), adding incremental prognostic value to wall motion score.
Cohort (n=646)
Does quantification of dobutamine stress echocardiography by strain rate imaging improve prediction of all-cause mortality compared to standard wall motion score in patients with known or suspected coronary disease?
Automated strain rate imaging during dobutamine stress echocardiography provides independent and incremental prognostic information for predicting mortality beyond standard wall motion analysis.
Effect estimate: HR 3.6 (95% CI 1.7-7.2)
p-value: p=<0.001
Background— Wall motion score at dobutamine stress echocardiography is an independent predictor of mortality. We sought to determine whether quantification of DSE by strain rate imaging was incremental to wall motion score for predicting outcome. Methods and Results— In 646 patients undergoing dobutamine stress echocardiography for the evaluation of known or suspected coronary disease, customized software was used to automatically measure peak systolic strain rate (SR s ) and end-systolic strain (S es ) in 18 segments. Results were expressed as the number of abnormal segments and the mean SR s and S es per patient. All-cause mortality was identified over 7 years of follow-up (mean, 5.2±1.5 years). Contributions of clinical, wall motion, and SR s and S es data to outcome were analyzed with Cox models, which also were used to define cut points for SR s and S es . Ischemia (new or worsening wall motion abnormalities) was detected in 45%, and 39% had a previous myocardial infarction. In patients with no ischemia, annualized mortality without and with previous myocardial infarction were 2% and 3% compared with 5% in patients with ischemia. Peak wall motion score index, mean SR s , segmental S es , and segmental SR s were all predictors of mortality, but only segmental SR s (hazard ratio, 3.6; 95% CI, 1.7 to 7.2) was independently predictive. In sequential Cox models, the model based on clinical data (overall χ 2 , 12.7) was improved by peak wall motion score index (18.4, P =0.002) and further increased by either segmental SR s (31.8, P <0.001) or mean SR s (25.7, P =0.009). Conclusions— Segmental analysis by SR s , derived from automated strain rate imaging analysis of dobutamine stress echocardiography response, offers prognostic information that is independent and incremental to standard wall motion score index.
Ingul et al. (Tue,) conducted a cohort in Known or suspected coronary disease (n=646). Strain rate imaging (peak systolic strain rate and end-systolic strain) vs. Wall motion score index was evaluated on All-cause mortality (HR 3.6, 95% CI 1.7-7.2, p=<0.001). Segmental peak systolic strain rate during dobutamine stress echocardiography independently predicted mortality (HR 3.6; 95% CI 1.7-7.2), adding incremental prognostic value to wall motion score.
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