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Significance of transient ST-T segment changes during dobutamine testing in Q wave myocardial infarction.

Abstract：

OBJECTIVES:We evaluated dobutamine stress electrocardiography for detecting potentially reversible contractile dysfunction or residual ischemia in the infarct-related area. BACKGROUND:ST-T segment changes in pathologic Q wave leads during stress testing may reflect contractile reserve, inducible ischemia or passive mechanical stretching. Dobutamine echocardiography allows detection of contractile reserve at low doses and inducible ischemia at high doses. METHODS:We used low (5 to 10 microg/kg body weight per min) and high doses (20 to 40 microg/kg per min) of dobutamine in 49 patients with a previous Q wave myocardial infarction and analyzed the relation between ST-T segment changes in pathologic Q wave leads and regional contraction. RESULTS:At low dose dobutamine, regional contraction improved in the infarct-related area in 23 patients. New or further ST segment elevation and pseudonormalization of negative T waves developed at low doses more frequently in patients with than without contractile reserve (both p < 0.001), giving a sensitivity of 43.5% and 60.9% and a specificity of 100% and 96.2%, respectively. At high dose dobutamine (43 patients), new or further ST segment elevation and pseudonormalization of negative T waves, occurring beyond those observed at low doses, had a low predictive accuracy for contractile reserve (sensitivity of 9.5% and 14.3% and specificity of 68.2% and 81.8%, respectively). Pseudonormalization of negative T waves at high dose dobutamine was 100% specific (but only 25% sensitive) for homozonal ischemia. CONCLUSIONS:ST segment elevation or pseudonormalization of negative T waves, or both, is indicative of contractile reserve in the infarct-related area when either develops at low dose dobutamine, but may be associated with worsening or no change in contractile function at high doses.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Lombardo A,Loperfido F,Pennestri F,Rossi E,Patrizi R,Cristinziani G,Catapano G,Maseri A

doi

10.1016/0735-1097(95)00499-8

subject

Has Abstract

pub_date

1996-03-01 00:00:00

pages

599-605

issue

eissn

0735-1097

issn

1558-3597

pii

0735-1097(95)00499-8

journal_volume

pub_type

临床试验,杂志文章

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Significance of transient ST-T segment changes during dobutamine testing in Q wave myocardial infarction.