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. 1999 Apr;81(4):398–403. doi: 10.1136/hrt.81.4.398

The functional significance of chronotropic incompetence during dobutamine stress test

A Elhendy 1, R T van Domburg 1, J Bax 1, P Nierop 1, M Geleijnse 1, M Ibrahim 1, J Roelandt 1
PMCID: PMC1728989  PMID: 10092567

Abstract

OBJECTIVE—To investigate the functional significance of chronotropic incompetence during dobutamine stress echocardiography.
PATIENTS AND METHODS—The functional significance of chronotropic incompetence was evaluated during dobutamine stress echocardiography in 512 patients without β blocker treatment who underwent dobutamine stress echocardiography (up to 40 µg/kg/min) and completed the protocol or reached the target heart rate. Mean (SD) age was 60 (12) years (313 men, 199 women). Chronotropic incompetence was defined as failure to achieve 85% of the maximum exercise heart rate predicted for age and sex (220 − age in men; 200 − age in women) at maximum dobutamine dose.
RESULTS—Chronotropic incompetence occurred in 196 patients (38%). Affected patients were significantly younger, more likely to be men (both p << 0.001) and smokers (p < 0.05), had a higher prevalence of previous myocardial infarction (p < 0.005) and resting wall motion abnormalities (p < 0.05), and had a lower resting heart rate (p << 0.001) and systolic blood pressure (p << 0.001) than patients without chronotropic incompetence, but there was no difference in the overall prevalence of ischaemia and significant coronary artery disease. By multivariate analysis, independent predictors of chronotropic incompetence were a lower resting heart rate (p << 0.001), younger age (p << 0.001), and male sex (p << 0.001).
CONCLUSIONS—The relations among sex, age, and chronotropic incompetence show the need to titrate the dobutamine dose using specific data based on age and sex related heart rate responses to dobutamine rather than to an exercise stress test. Obtaining specific heart rate criteria is necessary to determine whether chronotropic incompetence represents a real failure to achieve a normal response or is the result of applying an inappropriate gold standard.

 Keywords: dobutamine; echocardiography; chronotropic incompetence

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Selected References

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