Resting ST Amplitude: Prognosis and Normal Values in an Ambulatory Clinical Population
Background There is limited data describing ST segment amplitude in apparently healthy, asymptomatic populations. We analyzed ST amplitude in the standard resting electrocardiogram (ECG) in a large, multiethnic, stable, clinical population. Methods We evaluated computerized ST amplitude measurements...
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Published in | Annals of noninvasive electrocardiology Vol. 18; no. 6; pp. 519 - 529 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Blackwell Publishing Ltd
01.11.2013
John Wiley & Sons, Inc John Wiley and Sons Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Background
There is limited data describing ST segment amplitude in apparently healthy, asymptomatic populations. We analyzed ST amplitude in the standard resting electrocardiogram (ECG) in a large, multiethnic, stable, clinical population.
Methods
We evaluated computerized ST amplitude measurements from the resting ECGs of 29,281 ambulatory outpatients collected between 1987 and 1999 at the Palo Alto, VA. With the PR interval as the isoelectric line, both elevation criteria (≥0.1 mV, ≥0.15 mV, and ≥0.2 mV) and depression criteria (≤–0.05 mV or ≤–0.1 mV), were applied. Cox–Hazard survival analysis techniques were used to demonstrate in which leads ST amplitude displacement was associated with cardiovascular (CV) death. To create a cohort without ECG patterns clearly associated with disease, we excluded ECGs with inverted T waves, wide QRS, or diagnostic Q waves and coded the remaining “normal” ECGs for ST elevation and depression to determine a normal range.
Results
The only ST amplitudes that were significantly and independently associated with time to CV death when adjusted for age, gender, and ethnicity were ST depression in all of the lateral leads (I, V4–V6). When isolated to the inferior leads, (II and AVF), no ST amplitude criteria were associated with CV death. Among the “normal ECG” subgroup the precordial leads exhibited the greatest median ST amplitudes and the most significant differences between the leads, genders and ethnicities.
Conclusions
Significant differences in ST amplitude were present in the precordial leads according to gender and ethnicity. This was particularly apparent when amplitude threshold were set for comparisons. Our findings provide the normal range for ST amplitude that when exceeded, should raise clinical concern. |
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Bibliography: | ArticleID:ANEC12066 istex:4DA00A58834AA6017B18172DB005BC2DF578567A ark:/67375/WNG-V7R861DH-C Disclaimer: The opinions expressed in this article do not necessarily represent the views or policies of the Department of Veterans Affairs Financial disclosures: Dr. Froelicher is Co‐owner of Cardea Associates, Inc developers of hardware and software for screening for CV risk Support: None . ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Disclaimer: The opinions expressed in this article do not necessarily represent the views or policies of the Department of Veterans Affairs. Financial disclosures: Dr. Froelicher is Co‐owner of Cardea Associates, Inc developers of hardware and software for screening for CV risk. Support: None. |
ISSN: | 1082-720X 1542-474X 1542-474X |
DOI: | 10.1111/anec.12066 |