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The Prevalence and Prognostic Significance of ECG Abnormalities

The Prevalence and Prognostic Significance of ECG Abnormalities. For: ECG in Ischemic Heart Disease By: V. Froelicher, MD Palo Alto VAHCS and Stanford University Cardiology Dept. Study Selection:. Using MEDLINE we reviewed the literature over a period of 33 years from 1966 to 1999

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The Prevalence and Prognostic Significance of ECG Abnormalities

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  1. The Prevalence and Prognostic Significance of ECG Abnormalities For: ECG in Ischemic Heart Disease By: V. Froelicher, MD Palo Alto VAHCS and Stanford University Cardiology Dept.

  2. Study Selection: • Using MEDLINE we reviewed the literature over a period of 33 years from 1966 to 1999 • Studies where a randomly selected asymptomatic population (no history heart disease) had ECG then followed for 5 years for death

  3. Study Selection: • Studies that excluded or analyzed separately, individuals with known cardiovascular disease were of key interest. • Some studies made no exclusions • The Manitoba study followed an initially young and fit population over many years observing them for cardiovascular disease.

  4. Study Selection: • The pooling project excluded all those with major Q waves • However, many more excluded participants on the basis of more than one criterion including physician history of MI or angina pectoris, medical examination, and ECG.

  5. The ECG Studies (1 of 3): • The Framingham Heart Study • The Seven Countries Study • The US Pooling project • The Finnish Social Insurance study • The Manitoba Study • The Busselton Health Studies, Busselton City, Australia • Chicago Heart Association Detection Project in Industry

  6. The ECG Studies (2 of 3): • Chicago Western Electric Study • Copenhagen City Heart Study • White Hall study • British Regional Heart Study • Italian Risk Factors and Life Expectancy Pooling Project • The Tecumseh community health • Belgian Inter-university Research on Nutrition and Health

  7. The ECG Studies (3 of 3): • The WHO European study • Multiple Risk Factor Intervention Trial • The Honolulu Heart program • Evans County Study • Charleston Heart Study • The Cardiovascular Health Study • The ECG and survival in the very old

  8. Results: • All ECG abnormalities increase with age • Q waves and RBBB are more prevalent in men • ST depression and LBBB are more prevalent in women

  9. Results: • Several ECG abnormalities are associated with significant risk: • ST depression inclusive-LVH has a 33% five-year mortality in men and a 21% five-year mortality in women • Asymptomatic (silent) Q wave infarction is associated with the same risk as symptomatic infarction • ST depression is poorly reproducible yet risk increases with its prevalence

  10. Results: • Early repolarization is benign • The prognostic impact of bundle branch block depends on the population in which it appears • The prevalence of atrial fibrillation rises exponentially with age and is associated with higher risk than any other ECG abnormality in the Elderly

  11. Results: • T wave inversion and high voltage QRS are more common in Blacks than whites, but in general, do not predict coronary heart disease to the same extent • Elevated heart rate, but not ventricular premature beats, is an independent risk factor for sudden cardiac death

  12. Results: • We estimated the utility of the ECG as a screening tool by calculating sensitivity and specificity values from some of the studies that used stringent exclusion criteria. • We found that, for individual ECG abnormalities as well as for pooled categories of abnormalities, the sensitivity of the ECG for future death was too low for it to be practical as a screening tool.

  13. Results: • This almost certainly relates to the low prevalence of these abnormalities in the populations considered. • However, all abnormalities increase with age, and ECG screening is a consideration in the elderly.

  14. Results: • Multivariate equations can identify those who would benefit from additional therapy or health promotion • Among those who are already symptomatic with ischemic or myocardial disease, the ECG can identify a subset at particularly high risk.

  15. Results: • We hypothesize that this would extend to those at high risk from diabetes, HBP and those with high-risk scores. • The Framingham data suggest that although conventional risk factors relate to long-term risk, ECG abnormalities are better predictors of short term risk

  16. Results: what’s wrong with the Finns?? • Very High prevalence of LVH (20% vs 1%, others High: Moscow 12%, Copenhagen 18%, blacks) • Can’t perform ECGs? • High HBP prevalence and death rate

  17. Hi Prevalence Abnormalities in Women

  18. Low Prevalence Abnormalities in Women

  19. High Prevalence Abnormalities in Men

  20. Low Prevalence Abnormalities in Men

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