Negative U wave during percutaneous transluminal coronary angioplasty.

Abstract:

:To clarify the clinical significance of the negative U wave during acute myocardial ischemia, the appearance of the U wave and ST-segment elevation on electrocardiography during percutaneous transluminal coronary angioplasty (PTCA) of the left anterior descending artery (LAD group: 11 patients) or right coronary artery (RCA group: 18 patients) was studied. During PTCA, U-wave inversion (newly developed negative U wave, and increased negativity of the pre-existing negative U wave) was observed in 37 (90%) of 41 patients in the LAD group and in 16 (89%) of 18 patients in the RCA group. The incidence of ST-segment elevation was similar to that of U-wave inversion; however, U-wave inversion appeared before detectable ST-segment elevation in 20 patients (49%) in the LAD group and in 4 patients (22%) in the RCA group. Moreover, U-wave inversion was observed frequently in a wider range of leads than ST-segment elevation. These results suggest that the U wave is a more sensitive indicator of myocardial ischemia than ST-segment elevation in some patients, and that a negative U wave may be produced by a different mechanism than that which produces ST-segment deviation, although both are related to myocardial ischemia.

journal_name

Clin Cardiol

journal_title

Clinical cardiology

authors

Yano H,Hiasa Y,Aihara T,Nakaya Y,Mori H

doi

10.1002/clc.4960140311

subject

Has Abstract

pub_date

1991-03-01 00:00:00

pages

232-6

issue

3

eissn

0160-9289

issn

1932-8737

journal_volume

14

pub_type

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